Jaaaaag Misfire Mystery - Narrowing it down
AkioOhtori last edited by
I felt like posting... something... so here is a half-assed update!
After swapping coils, the Jag's misfire continues to be a problem and continues to be isolated to cylinder number 7. As a last check, I pulled the plug to make sure it wasn't fouled.
Sorry for the blur-o-vision picture. Yes the little nub at the end of the ground electrode is supposed to be there.
And alas it wasn't. I'm not an expert at reading
tea leavesplugs, but that looks maybe a little lean? Which might fit with the forthcoming "maybe I'm having injector issues" theory.
At this point I'm inclined to blame the #7 injector. Why?
- Plug, coil, and connectors look good
- Misfire did not follow coil when swapped
- Misfire developed after car sat for several weeks - no prior symptoms
- Misfire doesn't appear to be occurring in other cylinders
- Misfire doesn't occur once car is at operating temperature
Next step is going to be plugging in my JLR scanner and seeing what I can see, but as far as I know that is in the Disco, which is in storage and I couldn't be bothered to go get it.
ShrimpHappens last edited by ShrimpHappens
@akioohtori If you think it's a fuel delivery issue, have you tried an Italian tune-up and a bottle of SeaFoam/STP/Lucas/whatever? I can't remember from the prior posts what you've done, and I'm too lazy to look back at them.
drVanTraveler last edited by
@akioohtori If it isn't the injector, check compression
Qaaaaa last edited by
@akioohtori Agree, check compression