Touareg :: 2004 Misfires - Rough Idle And Hesitating / Shaking Under Acceleration
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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My truck is a 1995 Explorer 4.0 150,000 miles, 5 speed.
Problem - Rough idle : when cold it's worse and will stall and choke a little. When warmed up it just has a rough idle but will not stall and stays at a pretty constant RPM. It's very tolerable when warmed up but still not right. It drives fine once off idle. No black smoke that I can see. Power may be just a little off but I would not bet on it. MPG seems about normal but haven't been on a long enough trip since problem started to tell for sure. Also longer than normal cranking on occasion.
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No Check engine light ever. KOEO test shows no hard or on demand codes, I get the 111 pass. From CM I get 336 and 45.
336 is EGR related and my looks pretty rusty. I put a vacuum pump on it while running and the EGR held vacuum but had no effect at all on idle, I was expecting it to get worse as I opened the EGR so it may be stuck.
Searched high and low for vacuum leaks by ear, visual and with starting fluid all turned up nothing.
Actions so far : Replaced plugs, wires, IAC, and fuel filter. Cleaned MAF sensor and throttle body plus ran lucas fuel injector cleaner through it.
Next steps : I've got the EGR but it's so rusty I am sure I'll break the tube it bolts to plus I don't know it that alone will cause the rough idle. Will the DPFE sensor and/or EVR create a rough idle yet not turn on the CEL?
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