Sunfire won't fire...

Asked by Nov 29, 2015 at 08:25 PM about the 2004 Pontiac Sunfire Base

Question type: Maintenance & Repair

Long story short. I have a 2004 pontiac
sunfire... pos... my car will crank but not
start. I have replaced the starter, fuel pump,
fuel filter, coil pack, plugs, wires and fuel
pressure regulator all within the past 6
months. Now my car won't start at all... no
back compression. I had the pump tested
it's fine and strong but no back pressure at
all... I'm dumbfounded. I can't afford a
mechanic right now. Please advice. My
husband thinks there is a leak in my fuel
line. Idk where to start looking. Thank you

5 Answers


Did you replace the Ignition Control Module ?

2 of 2 people found this helpful.

Not yet I had it towed to my house I'm going to go rent a code reader tomorrow but I'm not 100% sure if that will show up on the code reader.


After reading all the other things you have replaced I can all most guarantee to you that is your problem.

1 of 1 people found this helpful.

Engine control module aka the ECM is bad it controls everything from fuel and air mixture to the timing for the engine if that goes bad then the car will not run at all all in all after changing what u have that's were I would look however it could also be that the timing belt has broke. Start at the ecm before u go tearing into the engine

1 of 1 people found this helpful.

Was the pump tested while on the car? I ask because a defective oil sending unit can cause the power to the fuel pump to be shut off.

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