eDeclpse92
10+ Year Contributor
- 351
- 4
- Sep 6, 2008
-
Belleville,
Illinois
I am chasing a problem that keeps eluding me. I have a misfire at idle and in low rpms under load. After that, the car pulls just fine after about 3000 rpms. It is a 91 galant vr4 completely stock. i checked with a timing light on all four cylinders and just shined it on the firewall and you can see each cylinder misfire intermittently. Things I have checked:
Switched out with known good coil pack, power transister- still misfires
o2 sensor CEL code- replaced with new one
new plugs and wires
compression and leak down results are very good.
boost leak test is done and no leaks were present
Timing is at 5 degrees BTDC
crank and cam pulley marks line up with the timing belt
injectors were cleaned.
new gas
Any suggestion to what this might be will be much appreciated, or the next step in diagnoses. Could a CAS do this?
Thanks!
Switched out with known good coil pack, power transister- still misfires
o2 sensor CEL code- replaced with new one
new plugs and wires
compression and leak down results are very good.
boost leak test is done and no leaks were present
Timing is at 5 degrees BTDC
crank and cam pulley marks line up with the timing belt
injectors were cleaned.
new gas
Any suggestion to what this might be will be much appreciated, or the next step in diagnoses. Could a CAS do this?
Thanks!