Hi All, I’m new to This forum although I’ve been lurking around with no account for a while, but I need some help. I have been trying to figure out an intermittent misfire on my 1999 legacy Outback for over a year now and I am not having much luck. The car runs and I daily drive it, but it vibrates at idle, especially when in drive/reverse and I have intermittent misfiring when driving, especially at around half throttle and when going uphill. If I push the gas pedal down the misfire always goes away. It also misfired worse when using anything electrical (windows, ac, turn signals, headlights). I have a CEL for engine misfire cyl 4.
I have recently replaced battery, alternator, spark plugs, wires, and coil and it seems like I have a strong spark.
I did a compression test and I have 165 psi on all cylinders with very little variation.
I swapped fuel injectors 3 and 4. Misfire stayed on cyl 4. I tried cleaning and then replacing with a reman injector #4. No change.
I’m thinking there could be a problem with my injector wiring, but I don’t know to test for this. Can anyone point me in t he right direction?
I’m going to try cleaning my grounds this weekend. Can someone tell me where the most likely culprit would be?
Any other ideas on what to check?