2003 grand am se 3.4 No fire

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Mike08ss/tc

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I have been having a issue with my grand am for sometime now. The car has spark, the fuel pump is running. When you go to the shrader valve on the fuel rail pressure is very minimal. That let me to changing my fuel pump, car still will not start. I have checked my fuses also and they are all good. I sprayed some gas in the throttle body and the car started and would stay running.

What should I look into next. Im not even sure where to start and has this happened to anyone else.
 
msmith1956 said:
Fuel pressure regulator maybe. Have you changed the fuel filter?
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I just put in a new fuel pump, new filter. Had very low pressure coming out of the fuel rail tried that first and still the same problem. Where is the feul regulator located on these things.

Thanks
Mike
 
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checked the regulator tonight it is working, turned key on and checked pressure at the shrader valve and it was very good. Car still will not fire
 
Is your security light on by any chance? It sounds like your injectors aren't working. If the security system is tripped (passlock) it will keep the injectors from energizing.
 
msmith1956 said:
Is your security light on by any chance? It sounds like your injectors aren't working. If the security system is tripped (passlock) it will keep the injectors from energizing.
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The security light comes on, but shuts off when you turn the key. Is there a fuse or anything for the security light.
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If it goes off when you turn the key to start it's usually not a passlock issue. Did you check fuse 38 in the engine compartment fuse panel? That fuse controls the injectors.
 
msmith1956 said:
If it goes off when you turn the key to start it's usually not a passlock issue. Did you check fuse 38 in the engine compartment fuse panel? That fuse controls the injectors.
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No I did not check that. Go check it now. When the car did start last night every light was on, on the dash.
 
msmith1956 said:
If it goes off when you turn the key to start it's usually not a passlock issue. Did you check fuse 38 in the engine compartment fuse panel? That fuse controls the injectors.
Click to expand...

checked fuses and everything is good there. I even changed them with some brand new ones i had. Now even spraying gas into the throttle body I can not even get the car to start now. It just turns over and over.
 
Ok, then it sounds like you aren't getting fire to the plugs. Look at fuse 1 and 7 in the engine compartment fuse box, they are for the ignition switch. You might also check fuses 39 & 44 in the same fuse block, they control the PCM.
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i checked fuse 39 it is good. i did check spark it is good. Ill have to check the other fuses and where do you think i should start next? i really appreciate the help.
 
How did you verify you have spark, did you remove a plug and lay it against a grounding source and see it fire?
 
Ok, I'm still leaning towards the injectors not firing then. Get a can of starting fluid and spray into the TB as you have someone turn the engine over... if it fires up, you know it's a fuel delivery issue.

ETA: if it doesn't start doing what I just mentioned, the next thing I'd look at would be a problem with the crankshaft position sensor, or camshaft position sensor.
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I will try the starter fluid. What else could really have a fuel issue other than i could change the fuel regulator.
 
Usually a bad regulator causes a rich condition from too much pressure at low RPM's.
 
I did try the starter fluid. The car started took a couple of tries to keep it running but stayed running. let it run for 15 min or so. I have to see what else the check engine light is on for. Have to get a scan tool tmw.
 
Well, if it started using starting fluid, you have a fuel delivery problem. You said you've replaced the fuel pump, did you replace the pump and fuel level sender as a unit. or just the pump? Also, you could have bought a pump that was defective.
 
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