Question about 2004 Pontiac Sunfire

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2004 Sunfire Running Very Rough

We bought this 04 Sunfire in Jan 08 for a car lot and now its Dec 08 and the problems have begun. The other day my girlfriend went out to start the car early in the morning and it was running bad. First thought I had was a headgasket as gone.

Here's the thing, the cars oil is clean, the antifreeze in the tank has not really moved and its clean and theres no leaks coming from anywhere on the vehcile. There was a little white smoke coming from the tail pipe but the smell was that of gas not sweet like antifreeze.

I also noticed the rad fan runs as soon as you turn the car on but does not turn off. Also the car feels like its running on only 2 cylinders and barley moves.

Im hopeful that it has something to do with the fuel pump constantly pumpng fuel into the car or choke stuck on. Its doing the samething my bike does when I first start it with the choke and give it full gas.

Could someone give me some ideas please. One of the local garages has quoted us 1500 for new head gasket and labour then another 700 if it needs a new cylinder head. This seems a little weird considering the car is well taken care of and has just went over 100,000km.

Again no leaks, oil clean, antifreeze clean, bad smell of gas from exhaust and bad loss of compression or flooding out. Any ideas please??????

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  • Andreadrejo Mar 05, 2009

    I seem to have the same problem with my Pontiac Sunfire, I have replaced the module that sits on top of the engine about 5 times this year, the problem was fixed for about a year the first one and then every module ive had since then didnt even last me a driving of my car. It seems to blow out when I put the pedal to the floor. Dont know what could be causing this part to keep going out. Did you ever figure out what was wrong?

  • shaunamason2 Apr 29, 2009




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Change the Sensor on top of the coil pack and that will fix the problem. #2 also try tune up. #3 Clean Fuel Injectors

Posted on Jan 19, 2009

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Do a tune up change spark plugs, wires, air filter, pcv ,and fuel filter.

Posted on Dec 18, 2008


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