Touareg :: 2004 Misfires - Rough Idle And Hesitating / Shaking Under Acceleration
Jan 13, 2016
It's a 2004 V8 Touareg with 100k miles.
Getting horrible misfires and they're jumping around to different cylinders + other intermittent codes. The symptoms are ROUGH idle, and hesitating/shaking under acceleration.
The MIL has never come on in this car. But, it illuminates when you turn the key forward. (Almost like previous owner coded the light out?)
Replaced all 8 spark plugs, just ordered 8 new ignition coils. Hoping the misfires are the coil packs but obviously theres some other stuff going on here.
Pulled codes 2 weeks ago:
1) random/multiple misfire (P0300)
2) misfire cylinder 4 (P0304)
3) misfire cylinder 8 (P0308 )
4) warm up catalyst efficiency below threshold bank 2 (P0431)
5) secondary air injection system insufficient flow bank 1 (P0491)
6) secondary air injection system insufficient flow bank 2 (P0492)
7) 02 Sensor Circuit Slow Response Bank 2 Sensor 1 (P0153)
Pulled codes 1 week ago:
1) random/multiple misfire (P0300)
2) misfire cylinder 2 (P0302)
3) misfire cylinder 3 (P0303)
4) 02 Sensor Circuit Slow Response Bank 2 Sensor 1 (P0153)
Pulled codes tonight:
1) random/multiple misfire (P0300)
2) misfire cylinder 2 (P0302)
3) misfire cylinder 3 (P0303)
4) misfire cylinder 4 (P0304)
Cleared codes. Swapped ignition coils from 2 & 3 with 7 & 8. Drove around the block, then re-ran them:
1) random/multiple misfire (P0300)
2) misfire cylinder 4 (P0304)
3) misfire cylinder 5 (P0305)
4) misfire cylinder 6 (P0206)
5) misfire cylinder 7 (P0307)
6) misfire cylinder 8 (P0308 )
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About 2 weeks ago, my 2005 Dodge Ram 1500 4x4 4.7L, was running fine. The very next morning, it's 4.7l engine has a very obvious misfire situation where it's hesitating badly, especially under acceleration at lower rpms, with the shaking feeling in the steering wheel etc etc. I have Advanced Auto parts and 2 separate auto shops plug in their little boxes to find the problem codes. The check engine light came on and stayed on as soon as this issue began. The codes they got were consistent from place to place: 1. Misfire on cylinders 4 & 6, and 2. Random multiple misfire.
So I go and buy 2 brand new coils for cylinder 4 and 6, and 8 new champion plugs. I was in Florida for a week, so the truck was NOT driven at all after the day this problem began. So I replace all 8 plugs and install the 2 new coils, but it makes NO DIFFERENCE. It's still hesitating just like before. Today I take it to Goodyear to have them do an allegedly thorough evaluation. They use their little code box and they get the same codes as mentioned above about random multiple misfire and misfire on cup 4 and 6.
Then the mechanic takes the truck for a ride and experiences the same hesitation and shaking under acceleration. So he replaces both of the new coils I had installed with their coils and replaced the 2 new plugs, just to make sure there was no issue with these new parts. He takes it out and apparently plugs in a different computer that monitors all engine functions, including air/fuel mixture, spark etc. According to that computer, the truck is running properly(according to them), and he checks compression and says it's good. So what's wrong, and he said that my car's computer was reset so the check engine is no longer on(I am not clear the how's and whys of that part). But the important thing is that it's still running badly and they can't tell me why it's running badly!
The mechanic said maybe a lifter collapsed or there is sludge that's causing an issue, but no solid explanation. Supposedly the 4.7L Dodge engine has a sludge issue experienced by some owners, and the mechanic recommended replacing the oil every 1500 miles instead of 3000. By the way, I asked how much it would cost for Goodyear to check the lifters and check under the valve cover, but he said they don't do that.
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Address 01: Engine
Controller: 4B0 906 018 CL
Component: 1.8L R4/5VT G 0001
Coding: 16551
9 Faults Found:
[Code] ....
At first I thought it might be a vacuum leak, but it looks like when he took it in 2 weeks ago they replaced all the vacuum hoses. It is unclear when he last had sparks and coils. I understand the likely culprits are:
sparks
coils
ICM
I am hesitant to blame sparks/coils if he is getting misfires on all 4 cyl. It seems like they might have screwed up the timing belt install given the camshaft sensor error, but he's been running for 50k miles since the change, and this idle issue just appeared recently.
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P0300
P0301
P0302
P0304
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(1) Replaced spark plugs with pre-gapped iridium
(2) Checked ignition coils
(2) Checked all vacuum hoses and air intake leaks
(3) Changed air filter(not a big deal)
(4) Removed and cleaned the throttle body with carb cleaner thoroughly
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(6) Computer PCM checked for updates and issues at dealer
The dealer said it needed new fuel injectors, which seemed kind of fishy due to the following symptom:
The car runs GREAT at highway speeds, but it is unable to maintain an idle for an extended period of time and dies due to misfires. I hear a chugging in the engine sometimes.
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Now I'm back to miss fire different location, and a rough idle. I've swapped coil packs around and the miss fire stayed on cylinder 4.
Spark plug screwed or injector or ?????
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I'm the original owner, and after some reading suspect it could be something else because:
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I've seen recommendations to replace the starter battery first. And other recommendations for "throttle body cleaning." I'm not a mechanic, but obviously would hate to have the hybrid pack replaced if it is something else.
I got the Check Engine/VSC/Triangle of Death errors yesterday. Autozone reports it is P0A80 (replace Hybrid battery) though no additional details reported.
I'm the original owner, and after some reading suspect it could be something else because:
1. In 8 years, the starter battery has never been replaced.
2. For about two months, the throttle has been hesitating when first accelerating (within first five minutes of turning it on). Yes, it is the hot summer months (though mild compared to previous summers). And the hesitation occurs even in the morning before things really heat up. This is definitely even worse after the error lights came on.
I've seen recommendations to replace the starter battery first. And other recommendations for "throttle body cleaning." I'm not a mechanic, but obviously would hate to have the hybrid pack replaced if it is something else.
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Change the Fuel Filters
Change the oil filter
Change Air Filter
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