Peter....thanks for another good DIY demo....when I replaced the plugs on my 2000 4Runner that I bought with 139K miles (and had P0300) random engine misfire, one bank had NGK and other Denso....my research revealed that each head was manufactured at two different factories in Japan...one used NGK and other Denso.....virtually same plug....I replaced with NGK and no longer have P0300 with a smooth running engine... :)
I think you are very smart and realized the solution to your p0300 problem. And as always let us learn what to do. That is my preferred way I personally teach as well. Change those two bad ones and I'm pretty sure no more p0300 code will set because that black one and the other slightly bad one definitely looks like misfire candidates. Surprised it didn't set p0402 and p0404 codes as well. But that just means Toyota built them well and with high tolerance
The originals made in japan used heads made by two different manufacturers and those models were shipped with one side having ngk spark plugs and the other side having denso spark plugs. I happen to have #491 of the 1999 model sr5 limited 2wd v6 made in japan. It has just under 100k miles on it. Mine actually has an Idle Air Throttle Controller attached to the filter side of the throttle body. I was a bit shocked to see your friend's 4runner with same year model and engine had a completely different throttle body. I'm also willing to prove it.
Peter, you are right I don’t smell and gas here either, good job taking out that FUSE!! I would be interested to here what the local Toyota Dealer would say about the best setup of spark plugs to install, either all the same or a mix set.
Another good thing you did is crank it more than most people do. A lot of people stop too early and you can see from their video it didn't stop building pressure yet! Which I suppose can work but not to the max pressure. They're just comparing cylinders with equal amount of cranks.
This is so important to do yet many never do it. But for me I had a good excuse. Both transverse engines made it difficult to do. My first was an ES300 the 1MZ-FE which you could get to the back ones but the tube would be in deep and hidden if the plenum wasn't taken off. Now in my 2GR-FE it's the same. The back three are hidden.
Peter I had a misfire problem with my 2002 4runner long time ago and it turned out to be a burned out spark plug wire that was going to cylinder 6 cause when I changed the wires I didn't hook the spark plug wire to the little plastic tab hanging from the plenum above cylinder 6 I left it laying on the engine head and it burned internally so I got new NGK wires hooked them up all in the right plastic tabs and raised well over the engine heads and ever since no problems, I figured this one out after changing the ignition coil and spark plugs which didn't help. Those wires get dry and crack internally from heat if not installed in their proper tabs, good luck
Toyota used to own Denso. I personally believe that Toyota, at the time, bought from two different suppliers in case one supplier had production issues.
Good stuff! After noticing the mis-match spark plugs, are you going to replace those with OEM Densos first? Or test the fuel pump first? Looking forward to the next video, friend. ❤❤❤ -David, Elizabeth, and little Jessica
Peter, I'm looking for a used Tacoma and will need to check the compression onsite since most of the trucks worth looking at are out of town and I can't take to my mechanic. Can you tell me what brand of compression tester do you use?
When I had a 1GRFE Tacoma, factory installed spark plugs were Denso in one bank, NGK in the other. But all 3 on each side matched. Do you think it would help even out the numbers having a battery charger hooked up?
Mike...when I replaced the plugs on my 2000 4Runner, there were NGK on one side and Denso on other (V6).....my research revealed that each head was manufactured in two different factories in Japan...one used NGK and other used Denso....told me the plugs were original and I replaced with NGK... :)
I did a CT on my 98 4Runner. 2 Cyls came out at 90 and 115.... both on the same side. Mechanic said the valves seemed fine so what could it be the issue? and if left unattended will that 90 PSI cylinder get worse? You gave your friend a pass so Im wondering... Thanks
Even though the service manual says "above 170 and higher", more than a 10psi difference indicates uneven wear or leaking valve seats. A 30 psi between highest and lowest is highly suspicious. Further, a bank to bank difference that high would have me stuffing in a pressure transducer and looking at cam timing.
I just did a compression test on my 99 4runner with results of 210, 203, 203, 198, 185, 200. There is 25psi difference between cylinder 1 (210psi) and cylinder 4 (185psi). Should I be worried? I have 230, 000 on the odo. no codes. no loss of power. Any feedback is greatly appreciated. Thank you
@@mosthated8190 From Timmy the Tool Man.....I wouldn't lose sleep over it but you could take it one step further and check your valve clearances. Maybe the low cylinder could use a valve lash adjustment and you'll improve the compression.ua-cam.com/video/MOlmjtlO7TI/v-deo.html
Yep according to the service manual instruction.. only odd deal is it doesnt say to disconnect any fuel injection or the efi fuses/ relay.. just says to crank her and floor it..
I tried doing a compression test on my 02 Tacoma. Borrowed a tester from a friend but it was an older unit, it didn't screw into the cylinders but used vacuum pressure to seal. On the second or third cylinder the hose would not release. I kept pulling, twisting, etc and the the hose released but also dropped a screw into the cylinder. That wasn't suppose to happen. Anyway get a better tester that screws into the cylinder.
Help! I have an engine misfire P0300 and I put in new plugs , wires , coils , and it’s still misfiring. I went to harbor freight purchased a compression test kit and my compression from cylinder 1,3,5,2 were 119-120psi, cylinder 4&6 were 140-142 psi. I know that the compression test for these engines are supposed to be 174psi or more? I know my compression is low but What am I dealing with here? Can anybody please help me figure out the next step?😊
My 2000 4Runner had misfire code few years back, ended up being an injector on firewall #5 or 6 cylinder I forget which...had 240K at the time. Also when i bought it in 2003 it had 88K miles and one side of engine had 1 brand of plugs, the other side had another brand. Still can't figure out what that was all about.
Reagan....I ran into the same thing on my 2000 4Runner....my research revealed that each head (with plugs) was manufactured at two different factories in Japan and one head had NGK and other Denso plugs.....so what you replaced were original.... :)
I've got the 4-cylinder 2000 4runner and kept getting p301 p300 codes. Compression tests showed about 50psi lower than 2, 3 and 4. How can this be fixed?
Please help!!! My 99 4runner wont rev past. 3,500 rpm. Drives fine but as soon as u stomp on in its like the rev limiter is at 3,500 and won’t accelerate any more. I want to sell my 4runner for a newer vehicle but afraid no one will buy it because of this problem. Any feedback?
I just did a compression test on my 99 4runner v6 with results of 210, 203, 203, 198, 185, 200. There is 25psi difference between cylinder 1 (210psi) and cylinder 4 (185psi). Should I be worried? I have 230, 000 on the odo. no codes. no loss of power. drives great. Any feedback is greatly appreciated. Thank you
Can someone please answer my question. Thanks in advance. Is it normal for the cold start rattle on 2AR-FE engine to return after it was repaired? TSB-0041-13 (cold start rattle on Toyota’s 2AR-FE) was performed at local Toyota dealer less than 2 months/2,000 miles ago and the rattle is back. Dealer is telling me it is normal. Is it? What can I do? Thank you!
Replace the cam chain tensioner. This is assuming the oil is good and the oil filter isn't a cheap piece of junk with no backflow preventer. MOST start-up rattles are caused by a lack of oil pressure, which is needed to put tension on the chain. NOT to be confused with a heat shield rattle.
HouseCallAutoRepair Thank you for your response. Toyota’s 0W-20 oil and TRD filter. oil has less than 3k miles. Dealer performed idle and 4,000 RPM oil pressure tests and values were well above tolerance. Car has less than 58,000 miles. Regular Toyota oil/ filter changes at 3 to 5k intervals since new. Will look into timing chain tensioner per your suggestion.
Usually the service manual will have this information. This is different than the little booklet that comes with the car in the glove box. Besides the firing order, you usually need to know the cylinder numbers as it relates to getting things in position when you're putting it back together, or adjusting the timing, etc.
Hello, can someone please answer my question. Thank you! Is it normal for the cold start rattle on 2AR-FE engine to return after it was repaired? TSB-0041-13 (cold start rattle on Toyota’s 2AR-FE) was performed at local Toyota dealer less than 2 months/2,000 miles ago and the rattle is back. Dealer is telling me it is normal. Is it? What can I do? Thank you!
I vote for those silly looking spark plugs as the problem. I've used some sort of high end fuel injector cleaners on all of my vehicles which helped a lot. Never had to replace/or clean an injector yet.
@@vadimnesen8060 but what are the odds of it being a 1999 and also having a 01-02 front grill ?????? 99 limited with Elocker have the same brake booster and reservoir as 96-98. Do a quick internet search for 99 limiteds with elocker for sale and look at the pics of the engine bay to verify. It even has the 01-02 updated taillights!
@@alataweel8954 thats exactly what I just said. Except I'm not sure about the grill. Car is over 20 years old im sure someone could have swapped the grill. I like that newer grill. I'd love to replace my chrome one
Petr, You can count on us to be here until WE get to the bottom of this issue.
Peter....thanks for another good DIY demo....when I replaced the plugs on my 2000 4Runner that I bought with 139K miles (and had P0300)
random engine misfire, one bank had NGK and other Denso....my research revealed that each head was manufactured at two different
factories in Japan...one used NGK and other Denso.....virtually same plug....I replaced with NGK and no longer have P0300 with a smooth
running engine... :)
Ivan, at Pine Hollow Auto Diagnostics, just had to change 4 of the 6 injectors on Toyota V6. Of course, it had 427,000 miles on the engine!
Ah the 2007 Rav4
Very good information as usual. Thanks!
Nice simple explanation and demo. (Sorry to admit this but I would've been the one who forgot to pull the EFI fuse.) Thank you!
Great Work Peter 😎
Great Detailed Information.! Thanks Brother. Awesome Video!
I always wondered how a compression test is performed! This is very helpful because I also drive a 1999 4Runner. Thank you.
I think you are very smart and realized the solution to your p0300 problem. And as always let us learn what to do. That is my preferred way I personally teach as well. Change those two bad ones and I'm pretty sure no more p0300 code will set because that black one and the other slightly bad one definitely looks like misfire candidates. Surprised it didn't set p0402 and p0404 codes as well. But that just means Toyota built them well and with high tolerance
Thanks for the lesson!
Thanks Petr!
Thanks so much for demonstrating a compression test. Learn a lot.
The originals made in japan used heads made by two different manufacturers and those models were shipped with one side having ngk spark plugs and the other side having denso spark plugs. I happen to have #491 of the 1999 model sr5 limited 2wd v6 made in japan. It has just under 100k miles on it. Mine actually has an Idle Air Throttle Controller attached to the filter side of the throttle body. I was a bit shocked to see your friend's 4runner with same year model and engine had a completely different throttle body. I'm also willing to prove it.
Do know why it has from the factory NGK and Denso plugs on the other ? I have 300k on mine
Peter, you are right I don’t smell and gas here either, good job taking out that FUSE!! I would be interested to here what the local Toyota Dealer would say about the best setup of spark plugs to install, either all the same or a mix set.
Excellent
Another good thing you did is crank it more than most people do. A lot of people stop too early and you can see from their video it didn't stop building pressure yet! Which I suppose can work but not to the max pressure. They're just comparing cylinders with equal amount of cranks.
This is so important to do yet many never do it. But for me I had a good excuse. Both transverse engines made it difficult to do. My first was an ES300 the 1MZ-FE which you could get to the back ones but the tube would be in deep and hidden if the plenum wasn't taken off. Now in my 2GR-FE it's the same. The back three are hidden.
Very good
Peter I had a misfire problem with my 2002 4runner long time ago and it turned out to be a burned out spark plug wire that was going to cylinder 6 cause when I changed the wires I didn't hook the spark plug wire to the little plastic tab hanging from the plenum above cylinder 6 I left it laying on the engine head and it burned internally so I got new NGK wires hooked them up all in the right plastic tabs and raised well over the engine heads and ever since no problems, I figured this one out after changing the ignition coil and spark plugs which didn't help. Those wires get dry and crack internally from heat if not installed in their proper tabs, good luck
Thx Peter
I used to have a 2009 PreRunner with a 4.0L. From the factory, Denso was on one side and NGK was on the other.
Last year I changed the plugs on my (very low mileage) 8.1 liter Chevy. Densos from the factory, all 8 of 'em. Couldn't believe my eyes.
Two different people working on the motor at the factory
Toyota used to own Denso. I personally believe that Toyota, at the time, bought from two different suppliers in case one supplier had production issues.
Same with my 2006 Tacoma. I was the original owner from new and changed the plugs myself. Was surprised by the different plugs in each bank.
Good stuff! After noticing the mis-match spark plugs, are you going to replace those with OEM Densos first? Or test the fuel pump first? Looking forward to the next video, friend.
❤❤❤ -David, Elizabeth, and little Jessica
Just FYI Toyota uses both denso and ngk depends on availability at time of manufacturing
Cool!
Peter, I'm looking for a used Tacoma and will need to check the compression onsite since most of the trucks worth looking at are out of town and I can't take to my mechanic. Can you tell me what brand of compression tester do you use?
When I had a 1GRFE Tacoma, factory installed spark plugs were Denso in one bank, NGK in the other. But all 3 on each side matched. Do you think it would help even out the numbers having a battery charger hooked up?
Mike...when I replaced the plugs on my 2000 4Runner, there were NGK on one side and Denso on other (V6).....my research revealed that each head was manufactured
in two different factories in Japan...one used NGK and other used Denso....told me the plugs were original and I replaced with NGK... :)
I did a CT on my 98 4Runner. 2 Cyls came out at 90 and 115.... both on the same side. Mechanic said the valves seemed fine so what could it be the issue? and if left unattended will that 90 PSI cylinder get worse? You gave your friend a pass so Im wondering... Thanks
Even though the service manual says "above 170 and higher", more than a 10psi difference indicates uneven wear or leaking valve seats. A 30 psi between highest and lowest is highly suspicious. Further, a bank to bank difference that high would have me stuffing in a pressure transducer and looking at cam timing.
I just did a compression test on my 99 4runner with results of 210, 203, 203, 198, 185, 200. There is 25psi difference between cylinder 1 (210psi) and cylinder 4 (185psi). Should I be worried? I have 230, 000 on the odo. no codes. no loss of power. Any feedback is greatly appreciated. Thank you
@@cybrah I want to know this as well
@@mosthated8190 From Timmy the Tool Man.....I wouldn't lose sleep over it but you could take it one step further and check your valve clearances. Maybe the low cylinder could use a valve lash adjustment and you'll improve the compression.ua-cam.com/video/MOlmjtlO7TI/v-deo.html
👍👍👍
You need to hold the throttle wide open during a compression test
Yep according to the service manual instruction.. only odd deal is it doesnt say to disconnect any fuel injection or the efi fuses/ relay.. just says to crank her and floor it..
Does it make any difference to test compression with all spark plugs installed (except for cylinder that is being tested)?
No-compression pressure doesn’t typically “leak” to other open cylinders.
I tried doing a compression test on my 02 Tacoma. Borrowed a tester from a friend but it was an older unit, it didn't screw into the cylinders but used vacuum pressure to seal. On the second or third cylinder the hose would not release. I kept pulling, twisting, etc and the the hose released but also dropped a screw into the cylinder. That wasn't suppose to happen. Anyway get a better tester that screws into the cylinder.
Omg 😱 get that screw out of the cylinder
Help! I have an engine misfire P0300 and I put in new plugs , wires , coils , and it’s still misfiring. I went to harbor freight purchased a compression test kit and my compression from cylinder 1,3,5,2 were 119-120psi, cylinder 4&6 were 140-142 psi. I know that the compression test for these engines are supposed to be 174psi or more? I know my compression is low but What am I dealing with here? Can anybody please help me figure out the next step?😊
My 2000 4Runner had misfire code few years back, ended up being an injector on firewall #5 or 6 cylinder I forget which...had 240K at the time. Also when i bought it in 2003 it had 88K miles and one side of engine had 1 brand of plugs, the other side had another brand. Still can't figure out what that was all about.
Reagan....I ran into the same thing on my 2000 4Runner....my research revealed that each head (with plugs) was manufactured at two different factories in Japan
and one head had NGK and other Denso plugs.....so what you replaced were original.... :)
I've got the 4-cylinder 2000 4runner and kept getting p301 p300 codes. Compression tests showed about 50psi lower than 2, 3 and 4. How can this be fixed?
What do you drive Peter?
Would be a good idea to put a charger on the battery to keep it up.
Please help!!! My 99 4runner wont rev past. 3,500 rpm. Drives fine but as soon as u stomp on in its like the rev limiter is at 3,500 and won’t accelerate any more. I want to sell my 4runner for a newer vehicle but afraid no one will buy it because of this problem. Any feedback?
I've read that a 5VZ-FE is more likely to have a bad head gasket than other Toyota engines before 200,000 miles. Has anyone seen that happen?
You can also tick the boxes for good starter and battery. 😉
Tick?
@@johnmaurer7084 What non-Americans say instead of check.
@@johnmaurer7084 mark, check, note, acknowledge, confirm, etc. In other words, look at what he does at 12:04
Keep filimg on this 4 runner because i have a 2002! 4 runner.
I just did a compression test on my 99 4runner v6 with results of 210, 203, 203, 198, 185, 200. There is 25psi difference between cylinder 1 (210psi) and cylinder 4 (185psi). Should I be worried? I have 230, 000 on the odo. no codes. no loss of power. drives great. Any feedback is greatly appreciated. Thank you
I want to know this as well
Can someone please answer my question. Thanks in advance.
Is it normal for the cold start rattle on 2AR-FE engine to return after it was repaired?
TSB-0041-13 (cold start rattle on Toyota’s 2AR-FE) was performed at local Toyota dealer less than 2 months/2,000 miles ago and the rattle is back. Dealer is telling me it is normal. Is it? What can I do? Thank you!
Replace the cam chain tensioner. This is assuming the oil is good and the oil filter isn't a cheap piece of junk with no backflow preventer. MOST start-up rattles are caused by a lack of oil pressure, which is needed to put tension on the chain.
NOT to be confused with a heat shield rattle.
HouseCallAutoRepair
Thank you for your response. Toyota’s 0W-20 oil and TRD filter.
oil has less than 3k miles.
Dealer performed idle and 4,000 RPM oil pressure tests and values were well above tolerance.
Car has less than 58,000 miles. Regular Toyota oil/ filter changes at 3 to 5k intervals since new.
Will look into timing chain tensioner per your suggestion.
How many miles on this vehicle? Great Work! Thanks!
Thank you so much
How do you know the number of cylinder?
He's talking about the firing order of the engine essentially. You can look up the firing order for your engine online.
Usually the service manual will have this information. This is different than the little booklet that comes with the car in the glove box. Besides the firing order, you usually need to know the cylinder numbers as it relates to getting things in position when you're putting it back together, or adjusting the timing, etc.
I bank of cylinders is farther forward than the other that's always 1,3,5 and 2,,4,6 on the other.
Hello, can someone please answer my question. Thank you!
Is it normal for the cold start rattle on 2AR-FE engine to return after it was repaired?
TSB-0041-13 (cold start rattle on Toyota’s 2AR-FE) was performed at local Toyota dealer less than 2 months/2,000 miles ago and the rattle is back. Dealer is telling me it is normal. Is it? What can I do? Thank you!
I vote for those silly looking spark plugs as the problem.
I've used some sort of high end fuel injector cleaners on all of my vehicles which helped a lot. Never had to replace/or clean an injector yet.
Those are the correct plugs for this vehicle
Is for sale
NGK = 'No Good Kind'
He might have snapped one the porcelain and use what was available.
Is that the 3.6?
3.4
1999 4Runner???? It has an 01-02 front grille. Even the brake booster is the 01-02 version. This can’t be a 1999
99 limited was a "newer" one. After 2000 all the models had what the 99 limited had
Brakr booster looks like this one has ATRAC
99 and 2000 limited have the brake booster unless it has a rear locker than its just normal ABS on the other side of the engine bay
@@vadimnesen8060 but what are the odds of it being a 1999 and also having a 01-02 front grill ?????? 99 limited with Elocker have the same brake booster and reservoir as 96-98. Do a quick internet search for 99 limiteds with elocker for sale and look at the pics of the engine bay to verify. It even has the 01-02 updated taillights!
@@alataweel8954 thats exactly what I just said. Except I'm not sure about the grill. Car is over 20 years old im sure someone could have swapped the grill. I like that newer grill. I'd love to replace my chrome one
mismatch plugs ... someone was being cheap !!!!
that is good compression !!!
They came from the factory that way. Denso one side, NGK the other. I'm not sure why.