We just changed the plugs and wires. The service light is on. A diagnostic test said it is a random misfire. What could be causing this?
2007-07-23 10:28:38 · 4 answers · asked by Sari 2 in Cars & Transportation ➔ Car Makes ➔ Pontiac
since you have already done a diagnostic. Re-do the diagnostic scan and it should tell you the cylinder is affected by the misfire 0301@ #1 cylinder 0302 @ #2 cylinder up to 0306. Now a misfire can be caused be a damaged spark plus (cracked porclein) ,bad wires, poor coil output, or a bad injector, last also after locating the cylinder make sure you do not have a a vacuum leak .....good luck
2007-07-23 16:58:56 · answer #1 · answered by h.a x 3 · 1⤊ 0⤋
Does the motor have a misfire now or did the plug wires and spark plugs repair a misfire? If you have repaired the miss, either get the code erased or just keep driving and the computer will reset after it passes the code a couple of times. If you still have a misfire you have to determine which cylinder acts up. This is pretty easy to do with a scanner. If you don't have one, you have to short out one cylinder at a time by grounding the plug wire. The one that doesn't make a difference is the culprit. Check for spark output at the plug end, sometimes coils get corroded or module goes faulty to one coil assembly. You could also have a bad injector or an injector that is dirty and needs a pressure flush or the injection system. You will have to go through the whole diagnosis thing again. Good luck.
2007-07-24 14:29:44 · answer #2 · answered by Deano 7 · 0⤊ 0⤋
Try purchasing some dielectric grease and put some on each spark plug insulator.That may fix it.
2007-07-24 00:59:02 · answer #3 · answered by (A) 7 · 1⤊ 0⤋
could be a bad coil pac, bad pickup modual in distribtor let us know the out come
2007-07-23 17:36:28 · answer #4 · answered by jimi c 4 · 0⤊ 0⤋