Question about 1999 Pontiac Grand Am GT

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My 99 grandy gt 3400 fires turns over but will crank only when gasss is introduced thru intake have checked all circuits and wires and replaced sensors fuel pumps are working and getting presure have spent two weeks working on this car and no results

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Have you checked the impuse of the injectors? If you got fuel pressure, I'ld look there if it runs with adding gas through the intake.

Posted on Aug 20, 2010

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99 grand am 3400 gt doesn't start. It ran fine , but now it won't start. It has spark and fuel . all fuses are good . Cranks over but doesn't start. It only stars if I put gas in the throttle. ????...

Check your ignition module.
My thought is, you have no fuel injector pulse. The voltage for fuel injector probably goes hot with the key on, the computer controls the ground circuit. If your missing rpm signal, no fuel injector pulse.
Another thought is antitheft/security system, where applicable.

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My 2004lmpala wont start 3400 engine ?

If it cranks good but won't start, have a helper crank it while you visually check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure. Also check for fuel injector pulse.

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Swapped a 1999 420A engine into a 1995 eclipse (also a 420A) and we have no spark. We started by checking the cam sensor and it is working properly it is upside down from the 95 but the ASD relay is...

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also the 95-96 relays are opposite the 97-99

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