981 misfire and useless OPC
Discussion
SkinnyPete said:
To be honest I really can't remember but I would lean to saying yes. My hunch is only 4 out of the 6 plugs were changed (if they even bothered at all) or when they were replacing it they damaged the ignition packs which are fairly fragile pieces of kit.
I'm going to have another crack at my OPC but failing that I'll change plugs and coils myself and I'll bet a months salary it fixes the issue.
Maybe a stupid suggestion, but could this be a lead that's failing, If the misfire is ignition related, and the plugs and coil packs have been replaced without any improvement, how old are the ignition leads?I'm going to have another crack at my OPC but failing that I'll change plugs and coils myself and I'll bet a months salary it fixes the issue.
AW10 said:
Um, no, pretty sure the issue with plug length was the bit inside the combustion chamber. At the connector/coil end they're all pretty standard.
Correct, they're the same size on the ceramic side, it's the electrode end that differs in length, depending on which one you fit to which engine depends on whether you end up with misfires or a squashed plug/dented piston. AW10 said:
Um, no, pretty sure the issue with plug length was the bit inside the combustion chamber. At the connector/coil end they're all pretty standard.
Correct, they're the same size on the ceramic side, it's the electrode end that differs in length, depending on which one you fit to which engine depends on whether you end up with misfires or a squashed plug/dented piston. SkinnyPete said:
mechanics sometimes get lazy when they think they can get away (especially when they get a bonus for completing jobs early, which they do at Porsche)
What a crazy idea. The customer pays for the time and then it’s cut short where possible.Not exactly confidence inspiring.
I've seen a car that had spark plug replacement and came in with hesitation .. one of the plugs had a bent electrode giving it a weak spark on that cyl .. no fault codes as it wasn't at the limits to generate one .. could be seen on rough running on a tester though.
Another possibility is the high lift solenoid is sticking .. it gives a low rev rough running fault .. but you would normally get a misfire from that bank if it was that .. takes a while though.
Another possibility is the high lift solenoid is sticking .. it gives a low rev rough running fault .. but you would normally get a misfire from that bank if it was that .. takes a while though.
I took the car to a well respected Porsche independent and they agreed they could feel exactly what I was talking about. Unfortunately their computer too said everything was fine, ignition, fuel etc.
They said have a go at replacing coils etc but I could just potentially be throwing money down the drain.
I then tried another OPC who had the car for two days, the best they did was reset the ECU and PDK ECU.
I’ll have to be honest it did seem to make an improvement although it wasn’t perfect, however as a few weeks past it’s back to how it was.
They’re taking another look soon, but this time I’ve asked them to liaise with Porsche Germany until the car is fixed.
They said have a go at replacing coils etc but I could just potentially be throwing money down the drain.
I then tried another OPC who had the car for two days, the best they did was reset the ECU and PDK ECU.
I’ll have to be honest it did seem to make an improvement although it wasn’t perfect, however as a few weeks past it’s back to how it was.
They’re taking another look soon, but this time I’ve asked them to liaise with Porsche Germany until the car is fixed.
put v power in it and run 3 tanks of that.
I had a hire car last week, filled up with £20 worth of 95 cheap s
t the car misfired and the engine light came on, I took the car back and said it's fked wont go above 30 mph and kangaroo down the road ! I thought I was stranded but after 3 restarts I limped it back to the garage, brand new 69 plate car with only 2 k miles on it also.
in my own cars I only use Vpower and my cars all run like a dream, if on the odd chance I have to put a tenner of 95 ron in I can tell straight away.
I think cheap fuel or even the 98 ron BP crap is all st stuff.
I had a hire car last week, filled up with £20 worth of 95 cheap s
t the car misfired and the engine light came on, I took the car back and said it's fked wont go above 30 mph and kangaroo down the road ! I thought I was stranded but after 3 restarts I limped it back to the garage, brand new 69 plate car with only 2 k miles on it also.in my own cars I only use Vpower and my cars all run like a dream, if on the odd chance I have to put a tenner of 95 ron in I can tell straight away.
I think cheap fuel or even the 98 ron BP crap is all s
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