supradealz
10-27-2009, 03:14 PM
S13 blacktop
Just started misfiring like its running on 3 cylinders. Constant, not an occasional miss. Tried unplugging each coil pack one by one and they all sounded like they were running on 2 cylinders. So maybe not plug or coil pack related. Pulled the plugs and there's oil on the base of the spark plugs. The tips are mostly fuel fouled not oil fouled.
Also tried unplugging injectors one by one just sounds like its running on 2 cyl.
Fuel pressure regulator reading steady 40psi.
Once the misfire went away when it warmed up.
Could be the camshaft position sensor. Could be head gasket failure or cracked block but car hasn't been driven hard and it worked one day then the next its misfiring. Also car mostly sits gets maybe 50 miles a month so a fouled sensor, injector, coil pack or such should be the most likely culprit.
Any other suggestions or tests?
Just started misfiring like its running on 3 cylinders. Constant, not an occasional miss. Tried unplugging each coil pack one by one and they all sounded like they were running on 2 cylinders. So maybe not plug or coil pack related. Pulled the plugs and there's oil on the base of the spark plugs. The tips are mostly fuel fouled not oil fouled.
Also tried unplugging injectors one by one just sounds like its running on 2 cyl.
Fuel pressure regulator reading steady 40psi.
Once the misfire went away when it warmed up.
Could be the camshaft position sensor. Could be head gasket failure or cracked block but car hasn't been driven hard and it worked one day then the next its misfiring. Also car mostly sits gets maybe 50 miles a month so a fouled sensor, injector, coil pack or such should be the most likely culprit.
Any other suggestions or tests?