Question about 2004 Pontiac Grand Prix

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Changed the spark plugs and wires now the car shakes, like it wants to turn off but it stays on. Autozone said a misfire was detectd with a hand held machine he used to test the car.

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Hi, check to make sure you have put all the wires back correctly. Use the appropriate picture below to check the wiring.


changed the spark plugs and - jturcotte_1336.gif


jturcotte_1337.gif

Posted on Mar 27, 2011

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Okay, this sounds like its misfiring, the engine light is on because the computer sees a problem, if you have the computer scanned it will tell you where the problem is, for example it will give a code and say cylinder 2 misfire.autozone will scan for free, if its a misfire i would start with a tune up , spark plugs ,sparkplug wires and air and fuel as needed, then see how it drives from there, the light can be cleared at autozone also, if it still picks up a misfire then depending on the cylinder you may have a bad coil pack also, there are three packs one controls two cylinders so depending on the cyliner misfiring thats the coil to replace, they should be labeled but if not just follow the wire to coil from cylinder, they are as follows, rear cylinders from left to right are cylinders 135 the front 246, hope this helps.

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