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i have a 03 pontiac grand am that will crank but not start. the fuel pump activates when you turn the key. changed fuel filter, and plugs cause the terminals were gone. when i push in the bleeder valve, i dont get anything. no air or fuel. so i figured it is a spark problem and tested the ignition coils and all 3 coils tested at 5.4 ohm. but at this point, im lost. if anyonw can give me some insight into my problem id really like to hear it.
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When you say you push on the bleeder valve, are you talking about the fuel pressure test port on the fuel rail? And you say you do have fuel there?
yes, thats the port. and no, no fuel. only a very small amount of air hisses out. it cranks fast so i have the suspicion that the timing belt is broke, but still strive for better answers.
Bad timing belt or no, you should have fuel squirting out of that port. Ideally, you would rent a fuel pressure test kit and take a reading to confirm, as a first step.
If the fuel pump is working, you will hear it initially run 3-5 seconds to prime the system and build up pressure. When you turn the key to crank, it looks for a crank signal to keep the fuel pump running. No crank signal will not allow fuel to flow (means no power to the fuel pump) (it is a safety thing).
Best thing would be to test your fuel pressure with a gauge. but if you have a tach, see if the RPM’s are going up when you are trying to crank… This works on some cars, but not all.
Ohms are not a very good way to test coils. Best done by seeing if there is a spark with a spark tester.
You can get a spark plug tester very inexpensively at flea markets/ Harbor freight or a auto parts store.
A couple of inexpensive tools are required for proper diagnosis.
Good luck!
-Karl
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