How to Adjust Air Fuel Mixture on a Mk1 VW Cabriolet
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- Опубліковано 24 лип 2021
- This video demonstrates checking and, if need be, adjusting your K-Jetronic-Lambda fuel injection system. I adjust the idle mixture on my 1988 VW Cabriolet which has CIS fuel injection. This would apply to most 80's VWs with CIS Lambda or K-Jetronic (Lambda) fuel injection.
The CIS air/fuel mixture is measured using a dwell meter. I purchased an inexpensive unit from Harbor Freight:
www.harborfreight.com/lcd-aut...
CEN-TECH LCD Automotive Multimeter from Amazon:
amzn.to/2Vq1XMY
To make the adjustments you need a 3mm hex/allen key. I purchased the one in the video here:
techtonicstuning.com/main/ind...
For additional info about the VW Cabriolet fuel system visit:
www.cabby-info.com/fuel.htm
For more info about adjusting the K-Jetronic system please visit:
www.cabby-info.com/kjet.htm - Авто та транспорт
Bro YOU are a LEGEND!
Great videos!
Glad you like them!
Thanks for sharing. Will be trying this soon on my ‘83. Cheers!
I wonder if this will fix my surging idle, it climbs and lowers, I’ve verified almost all vacuum leaks.
Good luck!
@@ShinyFastLoud it fixed it. Thanks! Check my video on my channel for the idle now. 😎
Thank you for this tip. I was looking for something like that.
Glad I can help
Nice video. I’m trying to troubleshoot the frequency valve.
Good luck!
Yeah man. Endless gratitude
Thank you
Your engine looks mint ,saludos
Thank you
Great video! So my rabbit feels like its very rich. It had a vacuum leak and I repaired it but it still under load will missfire out of the exhaust when on a load. i put the meter on it and it reads 6. I go to adjust the CO and when I just touch the adjuster to turn it the car dies. If I get a little bit of adjustment with out it stalling out it will stay at 6 6.3 I cant get it to move off that number no mater what I do.
The cis system im using is adapted to another vehicle. What does the test port connect to? Is it the o2 sensor, the mixture solenoid or something different?
VERY WELL EXPLAIN !!!!!
Glad you liked it
Hello, Q: I have made the similar connection . but no reading on the multimeter. stay on 89.9 . please advise. thank you
Thanks for sharing
My pleasure
Don't you have to unplug the frequency valve before you adjust this??
Need help, for some reason when i adjust that screw it stays on 44.7 and doesnt even move a bit. Its driving me crazy
Hey there, can i know where does the blue and white test signal wire connect from? I have a vw cabriolet mk2, which have a missing test connector, gonna get it back for tuning. Thanks in advance
Let me check
Hi, would you maybe know if this setting isnt in thr 45s if it has anything to do with my engine not being able to start?
I don't think the frequency valve would really affect starting.....more just the idle. What are your numbers? A lower duty cycle results in a leaner the mixture and a higher number results in a rich mixture.
Does this work on a MK2?
Thanks for the video. I did a 1985 cor a customer. But he has a 1980. And I can't find the same plug the 1985 has. Any idea where it is on a 1980?
Not sure
Hi there, thatks for that, unfortunately, the vw scirocco mk2 1.8 8v k jet does not have this loose plug, any ideas where I can get it?
I have the same question ! Someone has an answer? Thx
I just watched your vid [again] and wondered if this Dwell Adjustment works only on K-Jet, or if I could do the same on my '86 Cabriolet CIS? Don't necessarily want to spend $50 on a Dwell Meter if it's not going to read accurately. It's close to original, added only a g-grind cam, and I have the little tester dongle you thoroughly described. Thanks!
P.S. Hope the shop relocate goes smoothly...
CIS = K-Jetronic
All 1980-1989 North American Cabriolets using K-Jetronic with lambda will have the test port for checking & adjusting the system's duty cycle, including your '86. Go to the Cabby-Info.com link in the video description for complete information.
@@kamz4576 Hello.
Have you the similar website for the Audi 80/90 b2 platform? Thank you.
@@urqua495 Sorry, I do not. 😕
no
trying it now on my 87 Cabriolet
good luck
I have an '81 Rabbit Pickup with an EGR system (no oxygen sensor). Would you happen to know where I find the connector to plug the test leads into?
Unfortunately, I don't know where the test connector would be on a EGR equipped engine.
@@ShinyFastLoud would you know if EGR-equipped engines have an oxygen sensor?
Might be a bit late! my multimeter doesnt show anything when i hook it up like you did, any ideas?
Need a dwell meter
Beautiful subject. All who have CIS engines are mostly left on their own as there is no professional service for so old cars, maybe somwhere in Germany, maybe only. This video is great, but not clearly illustrated where that test cable is or if there is no such to find what are the options to look for certain contacts elsewhere under the hood. This is a problem. Who reads all text given, the confusion raises, 45 degrees must not be for all models and then what, how to know values for my model? Ups! I bought Multimeter with dwell after this video and then found out that CIS with 8 valves doesn't have control cable left for testing. CIS is a complicated set of parts, where if one is not perfect nothing will be good, shortly, a car to drive near home as anything can stop at any moment, unfortunately bit old and difficult.
Any idea on what the psi of each injector should be at at full open? Also what the cc rating would be per min?
Opening injector pressure is 46.4 to 55.11 psi. Injector flow rate is dependent on fuel distributor and CPR. This site has the flow rates of every injector listed by part number: users.erols.com/srweiss/tableifc.htm
@@ShinyFastLoud awesome, greatly appreciate your help brutha, im in lieu of chasing a hiccup around 1-2k rpm under a load, after 2k rpm she cracks right through, car has been sitting non op since 2008 so it was in rough condition, chasing gremlins down and trying to get her road worthy :]
So when I hook up my dwell meter to those plugs mine reads 0.00, any suggestions?
Press the (hold) button on the meter and should be on 90.0
Test the frequency valve itself. There is a good write up here: www.cabby-info.com/kjet.htm
is this process covered in the bentley manual?
I don't know.
Hi.
Do you have data for other engines ? 5zyl Audi w K-jetronic fuel system for example..
Thank you)
I don't
@@ShinyFastLoud ((
Where is the location of this plug?
Right where it is in the video. Should be floating around by the cold start injector.
My cabriolet is not working properly, I have been trying these steps for several days and it does not work for me. Could anybody help me? I connect my millimeter and it reads 89.9, so when I start the vehicle automatically the millimeter reads 00.0 and doesn't change from there. What could it be? Is it that the air mixture does not work in the car? How can I fix it? I don't think is the milímeter because is brand New. Any help will be appreciate it, thanks in advanced.
Test your frequency valve. The frequency valve's duty cycle is measured on a 0 to 100% scale. If the duty cycle is at 50%, this means the frequency valve is open 50% of the time, and closed 50% of the time. Conveniently, the duty cycle can be measured with a dwell meter set to the 4-cylinder scale; the example 50% duty cycle corresponds to 45° dwell (100% being 90°).
To test your frequency valve, you will need a DVOM and test light, along with a relay jumper wire. If the valve is not buzzing and/or vibrating (remember, that's what it should be doing!), follow these steps:
1 - Disconnect the frequency valve's harness connector.
2 - Measure resistance across the valve's terminals. Resistance should be 2 to 3 ohms. Yes: Valve is fine, continue testing. No: Valve is faulty and should be replaced.
3 - Remove the fuel pump relay and jump terminal positions 30 and 87.
4 - Using your test light, probe the frequency valve's harness connector terminals. Your light should shine. No: Check the fuel pump fuse, fuel injection power supply relay (there should be power going to the Jetronic control unit; see pin-outs below), wiring between all of these components, and all associated ground connections.
There is great info on www.cabby-info.com/kjet.htm
Why does my engine rev up really high when i plug my multimeter?
What setting is the multimeter on when it revs?
@@ShinyFastLoud i set it on 4cyl dwell
why not fit a wideband lamba sensor and actually measure the air fuel ratio?