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General => The garage => Topic started by: black90 on 18 October 2009, 15:39

Title: AUM 1.8T misfire - coil packs
Post by: black90 on 18 October 2009, 15:39

Quick one hopefully.
2001 AUM 1.8T - remapped to 207bhp.

Last night when engine was up to temp, when it was coming onto full boost it would sort of hit a wall, as if not enough fuel was available or missing on one cylinder.
Still drivable at revs below 2500rpm.

This morning from cold there's a constant misfire, down on power, struggling to rev cleanly and fast, the engine light flashes after a minute of driving and there is an eggy smell from exhaust.

I will be able to diagnose at work tomorrow, but I suspect a coil pack breakdown.
Pulled the spark plugs this morning, three looked perfect and one was black, so I imagine it's this one?
Three of my coils are 2003(L suffix) and 1 is a 2007(R suffix).

For my information, when looking at the engine bay, which is cylinder 1 and which is cylinder 4?

Thanks
Dave

Title: Re: AUM 1.8T misfire - coil packs
Post by: northeast_gti-t on 19 October 2009, 22:52

100% defo coil packs then as you look at the engine bay from the front cylinder no1 is l/h side the timing belt cover end and no4 is nearest the gearbox end  :wink:

Title: Re: AUM 1.8T misfire - coil packs
Post by: black90 on 20 October 2009, 09:22

Quote from: northeast_gti-t on 19 October 2009, 22:52

100% defo coil packs then as you look at the engine bay from the front cylinder no1 is l/h side the timing belt cover end and no4 is nearest the gearbox end  :wink:

Cheers, sorted it last night.
The conclusion in case anyone ever uses the search function in the future:
Fault codes found:
17963:P1555 Charge Pressure:value above maximum charge pressure - sporadic
17705:P1297 Connection: charger to throttle valve :pressure dropped
16684:P0300 Random multiple cylinder: misfire detected
16685:P0301 Cylinder 1: misfire detected.

Based on the fault code, it was looking like cylinder one coil pack as I suspected from plug condition.
Replaced the coil pack and hey presto, all is well again.

Cleared the codes and nothing has come back after a small drive.

The 17705 code sometimes recoccurs occasionally for me signalling the throttle body wants a clean, so I'll check for that again in a week or so.
Not too sure about the 17963 code, never seen that before.

Anyhow, the coil pack must have been slowly deteriorating over a period of time as the car feels super rapid this morning, just like the day I had it mapped at R-Tech.
Must remember to keep a spare coil pack in the car incase the other 3 now start to go, or replace them in advance.

Cheers