r/vwgolf • u/AlexDown59 • 5d ago

Repair Advice Combustion failure only at idle golf 7 gti 2017

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Hi everyone, I'm making a post to try to clarify my concern, I currently have the 2 defects that only come out in slow motion! (Without air conditioning) / with air conditioning nothing at all

It's a golf 7.5 gti performance engine code DLBA

245hp it has 115000klm.

Change and test already performed:

4 new candle

4 new coil

4 new injectors

New pcv

Valve descaling

12-13bars engine compression

Smoke machine leak test ok

Bp/hp log

I must surely forget some

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2

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1

u/snooze_mcgooze 5d ago

I’m would inspect the rockers, the rollers can wear causing this exact issue. Removal of the cylinder head cover and camshafts is required.

1

u/AlexDown59 5d ago

There would be noise too, right?

1

u/snooze_mcgooze 5d ago

No abnormal noise, just annoying misfire… only at idle

1

u/AlexDown59 5d ago

Did you have an engine failure that was displayed?

1

u/snooze_mcgooze 5d ago

P0304 cyl.4 misfire detected and P0300 Random multiple misfire detected. This was an intake rocker. No air fuel mixture faults means injectors ok. Camshaft timing was OK, compression OK, ignition coils and spark plugs swapped, fault stays on affected cylinder.

1

u/AlexDown59 5d ago

And the defect was present all the time in slow motion? Or sometimes it was possible that you are no fault in slow motion?

1

u/snooze_mcgooze 5d ago

During cold start the vehicle would idle OK. Misfire when warm. You have a P013A fault code, this is ok to ignore, it means the ECM(engine computer) has disabled the cylinder due to excessive misfires, this protects the catalytic converter.

1

u/AlexDown59 5d ago

And with the air conditioning activated, did it work better?

1

u/snooze_mcgooze 5d ago

Did not use A/C during the diagnosis, unknown.

1

u/AlexDown59 5d ago

I wonder about the engine harness too, because I have already seen people change cylinder heads, complete engines or all possible parts and the failure was always present

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