Hello fellow forum members.

I’ve recently bought a 2005 Volvo V50 2.4L non turbo. On my way back home engine orange engine light came on. Scanned it, (came up as ECM-250A long-term fuel trim) I deleted it and was gonna get it fixed soon. Next time I started the car light was on again. Drove the car for 2 days but then red engine light came on also with the message ‘’slow down or try to down shift’’. Felt like car lost some power and was running rough. Slowly made it back home but every time car went faster than 40km/h the engine light came back on.

Now code is ‘’ECM-3502 Misfire, Emission effect, Misfire, At least one cylinder’’. On live data shows that cylinder 2 is misfiring.

So far I’ve swapped around spark plugs, ignition coils and tried swapping injectors too but on live data still always cylinder 2 misfiring.

Any ideas what to try next? Thinking of getting compression test done and go from there.

Any help would be much appreciated, maybe someone has had a similar problem with their Volvo.

 

I do think that a compression test is the next logical step (you've done all the ones that would be suggested for a single cylinder misfire).

The other thing that springs to mind is that a fuel issue (like marginal fuel pressure) could cause multiple misfires, but perhaps it's just enough worse on #2 to trip the code (not the issue if your live data shows zero misfires on the other cylinders).