Cylinder 5 Misfiring at Idle When Warm

masa52 · 06-05-2026, 02:26 AM

I changed
both HPFP
ALL injestors
All Coils x2
All Sparkplugs x2
vanos actuator
map,tmap sensor
camshaft sensors
DME x2
Cable harness for injectors and coils
Alternator
Z11 power supply
fuel rail
LPFP sensor

This engine is completely fucked. The worst part is that all the logs look perfect, yet it’s still misfiring. I’m waiting to do a leak-down test now

ClaytonBigsby · 06-05-2026, 03:47 AM

Quote:

Originally Posted by masa52

I changed
both HPFP
ALL injestors
All Coils x2
All Sparkplugs x2
vanos actuator
map,tmap sensor
camshaft sensors
DME x2
Cable harness for injectors and coils
Alternator
Z11 power supply
fuel rail
LPFP sensor

This engine is completely fucked. The worst part is that all the logs look perfect, yet it’s still misfiring. I’m waiting to do a leak-down test now

Does yours smooth out if you turn on your rear defroster + AC? Does it have a DTC?

06-05-2026, 02:26 AM	#375
masa52 Private 7 Rep 57 Posts Drives: M8C Join Date: Jul 2015 Location: uk iTrader: (0)	I changed both HPFP ALL injestors All Coils x2 All Sparkplugs x2 vanos actuator map,tmap sensor camshaft sensors DME x2 Cable harness for injectors and coils Alternator Z11 power supply fuel rail LPFP sensor This engine is completely fucked. The worst part is that all the logs look perfect, yet it’s still misfiring. I’m waiting to do a leak-down test now
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