DIY: BMW Air Flow Meter Refurbishment
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- Опубліковано 8 лют 2025
- Video tutorial on how to refurbish/rebuild the Bosch Motronic air flow meter. Similar procedures can be applies to other units of similar design which can be found of other vehicles such as Alfa Romeo, Porsche, Volkswagen, Mazda, etc. If you do have an older model AFM such as what is shown in the video, you can also do an update/modification which can make the unit more reliable. This involves soldering a wire on the arm and swipe/wipe arm to cancel out the rotating contact. This particular tutorial was done on a 1984 BMW 733i.
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Air flow meter testing: • DIY: BMW Air Flow Mete...
Tools/Supplies Needed:
-contact cleaner
-razor knife
-7mm socket
-1/4" drive ratchet
-standard/flat screwdriver
-phillips screwdriver
-soldering iron
-solder
-short strand of 18 gauge copper wire
-5mm allen wrench/key
-paper
-lint free cloth
-small zip/cable tie
Procedure:
-spray the inside of the air flow meter with a sensor safe cleaner to remove any oil residue or dirt
-remove the plastic cover which cover the electronics by taking a razor knife, cut away the silicone, then using a standard screwdriver pry the lid away from the case
-once the case is removed, then clean away any of the older silicone, it should peal off with your fingers
-remove the two spade connectors going to the pinout plug
-remove the pinout plug by removing four phillips screws, then pull plug out
-if your air flow meter is a newer model, remove the spade connector on the arm as well
-loosen the 7mm bolt holding on the wipe arm
-you may need to separate the clamp portion with a standard/flat screwdriver
-pull the wipe arm upwards
-now you have direct access to all the contacts
-if you find that your temperature sensor is faulty, there is no part which can be purchased to replace that specific item but you can get a used air flow meter and remove the sensor from there or purchase a new unit
-the temperature sensor can be removed but removing the circuit board which is held in with four phillips screws
-the temperature sensor is held in with silicon, use a small wedged chisel, go along the side of the backside of the sensor and slowly pry it upwards
-installing a new sensor does need to be resealed in place using a sensor safe rtv sealant.
-using the paper, rub the contacts to ensure they are clean
-spray the contacts down with contact cleaner, then rub again with the paper
-finally rinse with contact cleaner and wipe away with a lint free cloth
-to adjust the wipe arm, pull the arm downwards towards the circuit board, and bend the other portion slightly outwards (this will move the wipe arm closer to the pivot point)
-test fit the wipe arm to ensure it does not rub on the circuit board or cause any issues
-if your unit requires an update, get a length of 18 gauge black copper wire slightly longer than the electronic cavity, strip both ends
-clean both surfaces where the wire will be soldered to
-using the soldering iron, solder one end of the wire to the stationary arm coming from the pinout plug, allow for it to cool down and secure the zip/cable tie
-reinstalling the pinout plug in the unit, then solder the other end of the wire to the wipe arm
-as for the idle screw, that required a 5mm allen wrench and the factory setting is three turns outwards
-reinstall the wipe arm and ensure it is tightened down firmly
-connect the spade connector and ensure everything is put back into place
-reinstall on the vehicle to ensure the unit is functioning correctly
-the unit can be adjusted, both the gear and that idle screw, but I recommend having the correct equipment to measure the vehicle's air/fuel ratio
-once you are satisfied, use a sensor safe sealant to install the cap back on
Thank you to all those who watch my videos and support my content. Don't forget to subscribe to my channel for future tutorial videos and like my video if you found it helpful. New videos are always being uploaded every week!
© 4DIYers 2013
All Rights Reserved
No part of this video or any of its contents may be reproduced, copied, modified or adapted, without the prior written consent of the author.
Thank you very much, very informative video. These days mechanics aren't taught how to fix things, they are taught to replace when you've got a problem.
Always happy to help and thank you for the kind words! Yep, I learned the old school ways, my father is a retired licensed mechanic. I grew up with points, tuning carbs by ear, testing sensors manually, and troubleshooting with a basic scan tool.
seems like this is an international problem
I have a BMW E36. I will try today to dismantle the flow meter. also I change the spark plugs. useful video. Greetings from Romania.
Thank you!
My car is an 86 which already has the jumper wire and I was wondering why it was there until I saw this video. Thanks for the info.
Been looking for this,now I know how easy it is a mechanic would've replaced the whole part and pay big$$..1fzfe 80's series Landcruiser 1993..thanks for your channel mate.
Happy I could help!
Is it safe to spray the circuit board with crc mass air flow cleaner?..cheers
@@4DIYers is it safe to spray the circuit board with crc mass air flow cleaner?..cheers
wow! this is by far the most helpful video I've seen in a UA-cam channel. keep up the good work and thank you very much for making this video, it helped me out a lot.
+giomed1 Thank you for the compliment and glad to help out!
Excellent DIY, thanks as I was wondering how to adjust the Allen bolt to factory.
No problem, happy to help!
Great video, I have a similar looking air mass sensor but on a different brand car.... I am going to take it apart after watching your video! Will post an update after is all done! Thanks!
Thank you, happy to help!
wow, impressive video. i feel a lot more confident working on my bmw's AFM now. i know you said to not mess with the wheel/gear, but i need to richen the a/f-mixture, to reduce NOX. thanks
Awesome video! Been a subscriber for a while but never saw this video. It’s exactly what I needed. Mahalo’z.
Thank you so much for the feedback and support, greatly appreciated!
A very helpful video. May I know if the carbon track has deep mark due to high mileage and frequent rubbing of contacts, can we in anyway shift the whole circuit board slightly so that a "new" contact track can be established
That is why most people slightly bend the tab/arm just a tiny bit to change the position, so the arm sity on a "fresh track". Some shops/electrical pros do have access to brand new circuit boards.
But that wire that overrides the touch connector changes the mechanical resistance of the flap and adds up as the spring tension ...
+Alex Benedek No it doesn't affect the tension whatsoever. But if you are worried, the flap tension can be adjusted.
A much smaller gauge wire would minimize any extra resistance. 18 gauge seems needlessly large. Good idea however.
Thanks for the video. Your accent is hitting home. Are you from the Buffalo, NY area? You sound very much like many friends from there.
You're welcome and no. I'm from Ontario, Canada.
buffalo NYs and ONtario CAN must have identical accents
Thanx for the video!
Will gladly hoon on the info to fix my peugeot 205 GTI.
You’re very welcome and thank you for the feedback!
Thank you for this very informative video 👍👍 I'll be tackling mine tomorrow 😁
No problem!
thanks! great video, its nice to find alot of answers that no one could answer exept nice ppl on the internet:)
No problem, happy to help!
i really appreciate it bro... i have an E30 and E28, and i'll try to fix them like you said in the video bro... greetings from indonesia
No problem, always happy to help!
Great video. One question: the bypass screw: you mentioned that turning clockwise would lean out mixture. I thought turning it clockwise would eventually shut off the bypass air, therefore enriching mixture.
+Isaac B Thank you. Nope, turning it clockwise on this particular model will lean it out. But it may vary between a couple different models as they did change over the years and there are some slight differences.
I had the same question. On the unit I have in front of me, which is from a 1988 Porsche 911, I believe clockwise makes the idle mix richer.
@@robfrost1 I think you are correct.
Excellent video tutorial. Thank you very much.
You are welcome!
Nice tips. Me and my '86 X1/9 thank you!
Glad to help and thank you for your comment!
really good video. i was wonderig if that whole unit could be replaced with regural potentio meter. for example tps sensor that is linear.
Thank you! Apparently it can be upgraded to a newer MAF system, but I haven't done that myself.
@@4DIYers how can it be upgraded
Thanks for the informative video, is there any gaps on the cover to place thin o-ring to seal the dust or moisture for the oxidation?
No problem. Maybe a flat custom made seal.
Thank you for the information. It will for sure help fixing my Opel Monza BY 1983. Is far too rich.
Happy I was able to help and thank you so much for the feedback!
I have a 91 e30, starts and runs but when it’s still cold it fluctuates the revs from 500-700 until it’s warm basically. Don’t know if I should try to fix or leave alone.
Excellent video man, we need more people like you.
I completely agreed with all what was said in this video
Thank you!
Excelente Maestro 👍
Thank you!
Renault from that period; including the Winnebago Lesharo/Itasca Phasar uses this system as well.
Excellent info, thank you for sharing!
www.hiperformance.com has an excellent written tutorial on the complete Bosch LU-jetronic with emphasis on rebuilding an adjusting the clock spring for better performance. They recommend moving the clock spring 6 teeth to the less taught position to gain 5 HP as the engines are tuned too lean. There are some other fuel ration adjustment tips on their site as well (They specialize in Alfa's, but the system is the same if one is familiar with it.) What has peaked my interest of late is trying to find out if one can substitute the more precise thermal anemometer type mass flowmeter from the LH-jetronic for the mechanical one used on the LU/LE-Jetronic and get the system to work properly.
Site seems to be down at the moment. I'd be hesitant adjusting the ratio without taking reading from the exhaust and wouldn't want to risk damaging the catalytic converter with the added fuel. I haven't tested it myself, but apparently the O2 sensor can be back probed and then monitored with a resistance reading. I believe people are retrofitting MAF sensors in place of these AFMs. I've never done it myself, there might be some modifications of the wiring involved.
My bad, www.hiperformancestore.com/Ljetronic.htm
I'll look into a little more carefully. Seems like an expensive proposition to change from LU-jetronic to CIS Mototronic, if that is what is required.
Here's an expensive upgrade I just found online, honestly didn't even know this existed www.millerperformancecars.com/store/show-by-car/e30/bmw-maf-kit-m20-m30-miller-detail
But I know there is a fair amount of tutorials around to do it yourself www.bimmerforums.com/forum/showthread.php?1228729-Make-your-own-MAF-conversion-for-under-50-I-did-it
Not something I'd do with this car as I'm not sure if the computer has been tuned by Hartge and it's just a relaxing cruiser anyway.
I have a 1985 Holden VK Commodore (3.3 ltr straight six cylinder) that uses a similar EFI system.
thanks for the video, i just posted it to the alfa romeo bb site,, should be helpful
Happy I could help and thank you so much!
Great video and explanation, thank you sir
Nicely done.
Thanks!
Thank you for your fine video
Thank you :)
what type of cleaner can you use? brand name please? rubbing alchol work? what is the name of the sensoer safe silicone?
Thank you!!! Very informative!!!
No problem and thank you!
Good work, please can this Couse your engine to vibrate, and also to smoking?
Thank you. Check out my other video on how to diagnose a faulty AFM ua-cam.com/video/Z-QlPtsjh7g/v-deo.html
Gracias, este ha sido el mejor video que he visto al respecto, y me has ayudado muchisimo a resolver mi problema
Happy to help and thank you for the kind words!
very good .100%. Thanks.
Hi , when you remove the black connection on the side of the afm
did you have to solder the pins back,
Great tutorial! My m30b35 seems to run very rich and just drinks up as much gas as it can, will have a look at this!
How would you adjust the a/f mixer without any equipment?
There's should be a bypass valve that allows you to sneak some air past the sensor flap, instead of messing with the potentiometer
If you want to know what your mixture value is but don't have a lambda sensor, you could "read" your spark plugs, but that's not very precise. It's just to see if you're in the ballpark of good stoicheometry
@@__-vb3ht I measured it at the sensor, reading around 0.620 mv, being a narrow band sensor it's right around stoich. I had a dodgy blue CTS sensor plug that could've been the issue. Solved that and now it's testing time
@@Fifress A so you have the LU Jetronic System, mines L-jetronic and doesn't hae any Lambda sensor
Thanks dude!!! nice tutorial !! cheers !!!
Thank you :)
Hi boss i did adjust mine reacher but using more feul.but when adjust it to factory setting it pinging.even when adjust the timing
Excellent video! Clear, concise, and thorough. Thanks! If the carbon track is worn out, is it possible to take a solder pen (i.e., pen with silver conductive material), and just draw/write over the worn tracks? Is there a reason this wouldn't work? I was under the impression that as long as the wiper arm contacts the material and current can flow that would be sufficent.
+milkphish As far as I know you can't restore the carbon track as it works on resistance and I believe adding any soldier to the surface will ruin the resistance function.
4DIYers do you know where I can buy a replacement boards? I have a few AFMs I am restoring that I have diagnosed to have bad carbon tracks
I have a problem with the gate not opening sometimes. I have placed an electrical tape like the one you placed and it has not benefited. Any advice??
Thanks sr!! very good video
Nice video. My viper arm when car is turned off is very loose and when I tight it up mixture is bad idle is 200rpm. I see your viper arm stands od the beginning of the black slide track mine is 1 cm further. Can you do a factory setting of afm or something similar tnx
Hi,
Is there possibility to get and change thermistor? Got one of this afm but thermistor is totaly broken and I would like to change it
Hi i was wondering why my bmw 1989 325i 's gas is too high cuz of the flow meter what can i do to repair it? Thanks a lot for this useful video if u could answer that i would really appreciate it .
I know is likely a stupid question but I presume you cannot swap a Lucas 2AM AFM with different model number e.g. replace 0280202046 with 0281002092 - I presume they have different resistances?
i followed the disassemby instructions as you have shown and i didnt really realize until i was about ready to pull the little black plug out of the afm, but there are two very very small wires that are connected to the plug and the small white and green board. im wondering about the importance of those two wires as they are both very weak and one of them bent off. i have an 89 e34 525i with the m20 engine, the afm seems to be the updated version because there is a wire connected to the hinge assembly like how you added to "upgrade" your afm. i hope i can get a response soon !
if i disconnect this the car dont run at all ? I got a very slow audi 80. I think mine is failure
Hi there. Extraordinary job and helpful video. Thanks a lot for doing it... I'm about to try it out, and I have a question: My car is a 318is 1993 m42, Europe, and it has been showing issues with the mixture (at the begining, just a rough idle; now it hardly starts, after changing ICV and, because of a rattle when starting while cold, the timing chain tensioner). I found it has not O2 sensor (the electric connector sealed, and no hole on the exhaust manifold); and I checked them out all the hoses, the sparks, their wires, the coils, and they are in reasonably good shape. So I tried with the MAF (at this point I realized it is more than likely it was "changed" by a mechanic guy; of course without my knowledge). Well, the MAF's housing vane sticks when being closed, at half its way, and widely open. And it is evident the engine asks for more air to start and operate. I'll test it following your previous video, regarding the Bentley Manual's specifications for its engine. As I'm sure it won't pass the test, I want to ask you: Is this procedure (changing what it's needed to change) applicable to an 1993 m42 engine? Especially the adjusting of the swipe arm to run on the track by a new place and the manner to adjust the air with the idle screw. Thanks in advance for your attention.
Jesús J. Ortega Weffe Thank you for the compliment. Yes it should be. There has been some minor changes or updates throughout the years but the basic unit is the same, even outside of BMW models. Similar units where also found on other European auto makers as well.
Hi, I need your help..
I have 89 e30 m20b25 082 coded afm. And my question is; For rich mixture, which way do I have to turn the black wheel. Clockwise or anticlockwise?
Thank you🙏
Hi would the circuit board also be referred to as traceboard??
Thanks for the great Vid. I have 88 bmw e30, when I first step on gas, there's hesitation, like a flat spot, is that the wiper track on the circuit board? or air fuel mixture? Thanks again for your help
+Vincent Vizzari The flat spot could be a variety of issue. It would be best to check out my test video first on this unit to determine if you are having the same symptoms. If not, the issue could be anywhere from a dirty throttle body, other faulty sensors, or just basic tune-up maintenance.
Thank you for your advise, I will check out the unit and give it a good tune. Thanks again
Didn't it came up to your mind that the wire changes the arm rotation resistance ???
There shouldn't be any resistance rating in the rotational contact. The wire adds reliability to an old design which is why it's an update on newer units.
Thanks you helped me out a lot
Thank you :)
I got a question. I have an 1988 ford 2.3 turbo setup in my mustang and at high rpms (after 55k ) the engine stumbles and misses for several minutes after. Feeles like cylinders were shut down because my afr reading were normal the whole time it stumbles. Im trying to narrow it down. I wondering if the vane meter would cause this ?
Who i can find one of this ? I have it on an iveco daily 1993 and jet make me trouble, or I can make a bridge on the potentiometer side ?
thank you very much for this video and your narration which is primarily informative and detailed explanations. I want to get an idea from you about some important nuisance. My old lady is 1981 modell E-23 745i Turbo (EUR)
Air flow Meter's the fabrication settings were completely degraded some stupid technician played with a black wheel and me and bmw service can not get a setting again. this instability, the car emits black smoke and the idle is broken. How can I return to factory settings?
Oktay bey merhaba, buradaki zengin ve fakir karışım anlatımında da sanırım hata var. Size tavsiyem şudur ki, siyah dişliyi klape boşa düşene kadar gevşetin ve ardından 6 diş sıkın! Bunu aslında egsoza çubuk sokarak ve bilgisayar vastasıyla emisyon değerini okuyarak yapmanız çok daha iyi olacaktır. Lakin dediğim gibi. Klape boşa düşene kadar çarkı gevşetin sonra 6 diş geri gelin.
I let my wheel spin adjusting it. Have any idea what I can do?
My spring was previously adjusted by mechanic, do you know how to reset it back to factory settings, thanks
Amazing! Before watching this I had 2% confidence that I could repair my AFM.. I have 99% now! Anyone know if 3vze (toyota 4runner) AFM is beyond the home repair man's tools/ability? I will probably open it up before anyone responds to wish me luck.
If i remove the gate can it work good ?
If my carbon runing out, how i can replace it? How to recarbon the circuit. Answer please
Hey, nice work there, i just hav a technical question, i hav an e36 with an m42b18 engine, somehow i bought it fitted with a 1.6 litre manifold, does this affect my power output and fuel consumption??
+sherif mohd Thank you. I haven't really done any performance upgrades to an M42, but upgrading an intake manifold in general does have it's improvements. They will normally change the power band, may or may not increase fuel economy, and will usually increase performance.
Hi from Yemen, Please help are the circuit boards of m20b20 and m20b25 afm interchangable? ,mine is m20b20 89 e30 Metronic 1.3 dme 173 and i couldn't find a circuit board online for m20b20 afm.
Please help
how do you remove the plastic cover that is secured with the silicone? Mine seems bonded and I cannot figure how to loosen it..
Little knife?
I have a 1988 735i and I have tested and cleaned the mass meter. But I keep getting code 1224 air flow temp sensor. I tested it according to your video and I only get around 900 omhs the car stumbles and almost dies warm or cold. everything else checks out fine engine temp sensor, fuel pressure--- new filter, tps, idle control, cleaned plugs are tan all looks good. so how can I fix the temp sensor for the air flow meter, all wires check out fine?? Your numbers 1450--3300 don't even come close on mine with a hair dryer i get from 900 to 7ish?? Help if you can. Thanks
where can i buy this new or at least half new online
Hi, thanks a lot for such an useful video like that, I was wondering if I can use that knowledge to fix my BMW 528e air flow meter? That air flow meter in your video is quite different from mine. Hope you answer me soon, and again thanks a lot.
+Adrián Mata Pineda Thank you. As long as it uses a flapper to monitor the air flow, then yes. I thought the air flow meter was the same on an E28. E28 body style right???
Worn / graze carbon track, can it recarbon?
Thank you.
Andi Silalahi As far as I know, no.
no, moving the "pickup" point just a bit will start sliding on a new "track"
Hi great video my Bmw is currently at a Bmw dealership for repairs the car does idles rough at low rpm' but when they rev it up till about 3500rpm the motor revs smoothly they already fitted new coil pack and plug wires new plugs and tips sensor lambda sensor they already tested my airflow meter by fitting a new one and their were no improvements do u maybe have any advice or information that could assist me please???!!!
+Johan Spies Thank you. Possibly you may have a vacuum leak, either relating to a rubber line or gasket.
I have two AFM's, one that is original to my 91 e30 320i and one that is from unknown aged e30 320i, the latter one has 5 pins instead of 4, does anyone know of a good way to adapt it to the loom?
The one from my 91 e30 is totally clogged up and won't move freely even after immense cleaning attempts.
I tried moving the circuit boards and springs etc but the tip of all the screws broke off.
Should I drill them out then move the circuit boards or is there another solution?
HI, Could you tell me that, this video use for R134 air flow right ? Because, I use M40 with R134 Air flow and I have no experience on fixing cars. But, I try to do
PrimusFire TopSpin R134 is the type of refrigerant your a/c system takes, it has nothing to do with the air flow meter/intake.
9:06 mine stays closed until i push it hard first time and it has a squeak after each time i move. then it seems to stuck when it passed in the middle. it takes a little push to get it to move it isn't smooth. and if i don't push it stays in the middle and doesn't open or close all the way itself without a push
does this mean i should replace the whole thing or is this normal? i've only used MAF cleaner spray.
Update i couldn't get the top open as one screw stripped, but using enough MAF cleaner and working the door, i was able to get it 90% better than what it was, where it doesn't stick in the middle nor resistant. I sprayed underneath and above the door as i worked it back and fourth. I plan to change it out one day ($50-60 online).
my astra on idle its going up and down i clean the throttle body and the maf senzor but have the same problem i clen the egr valve and no solve the problem i opened the air flow meter and i cleaned with spray but astra doing the same what i need to do did i need to go right or left with the spring ?
+goce koleski Have you checked for vacuum leaks or a faulty idle control valve?
There is no idle control valve and there is no vakum and air leak its something else
Thanks men! Is dificult for me understand you all,but i'm get a idea :)
How remove the tape?
***** Which tape are you referring to???
Thanks,i'm refer to simple black tape of circuits,the protection tape:
It is stuck with some series?
A trick to not break?
Thnks for your atention :)
If you mean the black cap, there is a small amount of adhesive that will just break off once prying. Or if you mean the carbon track on the circuitboard, thats for the potentiometer which is just the conductor.
ok oks,sorry,i'm study english hehe,yes friend,the black cap,the other questions are solved,repeat,thanks for your time,big job,thanks for your wisdom,is very important for me learn for the future,and to part,love Bmw and learn thinks of bmw,for example,this caudalimeter,also goes to the Opel Calibra :)
I suscribe with your channel,I follow you and i'm happy of speak you and understand,pracxtice the other language,open other or new vsion for me,I love :D
can that card expire ? or just need clean it becaz I have bad reading in my car
It will eventually wear out. Try cleaning it first or adjusting where the contact rides.
Hello!
I have a 318ti from 95' and i was experiencing rough idle problems just after I bought the car and replaced the air filter. Firstly the car was showing a high rotation idle, around 2k rpm. I found some air leaks on the air hoses on intake manifold. Thought the problem was fixed... not so fast. When I started the engine, the idle became very rough and the engine came down dead. Nearly impossible to drive because the engine could not sustain the idle at aprox. 750rpm. Seeking for a solution, I found your video. Which points on the AFM should I look for when doing this review/repair? My engine is an M42. Looks like there it is not enough air passing into the engine, because when I produce an air leak on the intake hose, the idle became pretty better at 1k rpm, if I expand the leak, the idle comes up and up, just as it was before the hoses repair.
The AFM its way expansive to replace, but looks like the problem is there. What should I do next? Thank you.
Gabriel Neves Yes it is quite possible the AFM could be the culprit. You can take it apart and clean the potentiometer inside. Then see how it runs and an adjustment maybe required, but be sure to have the correct equipment to determine what your air/fuel ratio is.
Hi, what to use to replace the old wearing carbon track? Thanks
Did you manage?
@@jmsure1 nah, using somekind of carbon liquid into that carbon track.
Thank you.
No problem, happy to help :)
What about that hex screw on the outside of the afm box. I played w it by curiosity but I can't tell a difference gor the car was already normal tenperature. If you or anybody could give me some insight about how can this affect the performance of the car (1987 325i) Thanks
That is explained at 11:42.
4DIYers thanks!
I have an e34 535i im not getting any values when testing the air temperature sensor
eddyLF There might be a broken connection or the sensor has completely failed.
4DIYers ty it works it was a problem with the multimiter but when testing pin 2 &3 im getting 555 ohm when flap closed at middle highest value 900 ohms then it starts to decrease after 1/2open flap when fully open it has the minimum value 100 ohms that means I should replace my afm ?
I don't have maximum or minimum valves unfortunately. But it should be a fairy even value when it's closed or open. Here's a full testing tutorial which also shows how to test it using voltage. Using voltage is a much more reliable method than compared to resistance. ua-cam.com/video/hQYRep6K15k/v-deo.html
can u show me how to rebuild maf on astra 1.8 16v 115hp please?
+goce koleski Unfortunately I we don't have that model of vehicle where I'm located.
Do you happen to know someone who can do board repair? I have an ATM part of a NBT Evo navigation system from a M4 that needs fixing. Thanks!
Unfortunately no, but someone who does general electronic repair should be able to do so.
I wonder if this is the reason why my e30 won't start
My E30's AFM smell like there's gas in it. Is it normal or i need to do something?
That is not normal, either you have a fuel leak or the engine is backfiring.
@@4DIYers ahhh ok cheers mate
To reduse consume of fuel what do ??????
You can't just reduce the fuel economy by leaning out the fuel. A lean mixture won't allow the engine to run right, reduce performance and can burn out a valve or piston. The get the proper air/fuel ratio, the exhaust needs to be probed.
Hi 4diyers, i have a slight issue with my e30 '85 323i. I had a bad intake rubber hose and the car had too much air but it worked fine. Since i replaced it with new hose, rpms went up to about 1500. I tried to lower the rpms by turning the screw in the intake manifold on the passinger side and on the throttle body. I lowerd the rpms but the car lost power. Then i tried to move the teeth wheel in the amf counter clock wise and clock wise in order to get that air-fuel mix but i failed.
Yesterday i moved the sweeper arm slighly to the left to gain some stable rpms and the car is still running poorly. Going uphill is a nightmare, almost impossible, and on a straight road rpms barrely go over 2000 rpms.
Is there any way to improve my cars performance? Thanks and sorry for the long comment.
Start by checking the throttle position sensor and also look at the idle control valve. Those would be the two places to start for high idle. Don't forget to subscribe :)
4DIYers I dont have either of those i guess. I know for sure that i dont have icv.
hehe I wont forget :)
You should have both, that is an M20 right??? I have a test for the throttle position sensor, I believe yours is the same as the M30 with a two stage switch. That was causing the high idle on my M30 when the idle circuit failed. The idle control valve can also stick, become dirty, or fail completely. Unfortunately I do not have a video on that as of yet. Another issue maybe a vacuum leak, either on the gaskets or any rubber hoses that deteriorate over time.
Thank you for the support!
4DIYers I will check again soon. Thanks for your help :) You have great content.
No problem, glad to help out!
richer in fuel and not richer in fuel, which makes the car drive fast?
Richer will increase performance, but not too much where it can flood out the engine. With a richer mixture, it will increase fuel consumption, foul up the plugs quicker, and you may risk plugging the catalytic converter.
hi, is that the maf sensor ( hot film mass airflow sensor, #1 on the diagram), or the throttle housing assembly next to #3 ?
www.realoem.com/bmw/enUS/showparts?id=ET75-EUR-07-2004-E46-BMW-318i&diagId=13_0949
The E46 has a MAF, not AFM. So the MAF is part #1. Don't forget to subscribe!
Thinks
No problem, happy to help :)
Turboford approved
Which one? Thunderbird?
İs this M30 engine!?
Yes it is.
Can i send you my maf unit off my BMW 735i E23 For you to rebuild ? You would be a life saver if you could. Contact me asap