Need help. My car is idling weird as if its misfiring. no codes coming up. hooked up my tuner and datalogged the car. Everything is fine except for the spark advanced. At idle the spark advanced is moving all over the scale from 20 to 45 in very speratic sequence. When the car seems to come back alive the spark stays at 20.

 

Whens the last time you changed your spark plugs as well as your o2 sensors. SOunds like your ecu is trying to compensate

 

O2 are new and the plugs have less then 3000 miles on them.

 

CAN ANYBODY HELP?

 

It's your Coil on plugs, Take each one out and check the Ohms, and make sure they are all consistant. I'm almost exactly sure that's whats going on, but I could be wrong

 

I bought a meter and checked my coils there all consistant!

 

No one has a clue? Could it be the Crank position sensor?

 

It can be the CPS or believe it or not the alternator which is known to cause problems with the CPS.
Is it throwing any codes?

 

no, its clean of codes!

 

Try swapping your COP's. I've been having problems with mine, especially when it's wet out.[&:] I even bought a brand new set of Granatelli's 2 weeks ago, and one went bad already, so I bought some ACCEL's this time. Water gets into my #4 spark plug hole and gets that coil damp or something and screws it up. RTV this time!!!!