WHAT WOULD CAUSE MISFIRE OF #2 AND #3 CYLINDERS?

1999 Saturn SL2

Tiny

saturntech9

January, 31, 2012 AT 6:40 AM

Keep me posted on how it goes.

Tiny

1999sl2

February, 18, 2012 AT 11:10 AM

I bought a new ignition module, installed it and that did the trick, but not the idle is high and erratic. I removed and cleaned the spark plugs and removed and wiped off the O2 sensor on the header, figuring that the plugs and sensor might have gotten fouled with unburned fuel. No joy. Is there another valve/sensor that would have been fouled by the unburned fuel, or do you have other thoughts?

Tiny

saturntech9

February, 18, 2012 AT 4:23 PM

What codes do you have now?How high is the car idling?How many rpms?What kind of spark plug do you have in the engine?Not platnuim ones I hope?

Tiny

1999sl2

February, 18, 2012 AT 4:39 PM

No check engine light, yet. 2000, but up to 3000, sporadically. Stock Saturn dealer ones (?)

Tiny

saturntech9

February, 18, 2012 AT 10:14 PM

With that high of a idle I would check for vacuum leaks first.

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