1991 Buick Century wont start

1991 BUICK CENTURY
27,500 MILES • 6 CYL • FWD • AUTOMATIC
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MATTYBETTS
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I replaced the fuel pump(gets good pressure now} and also replaced the fuel regulator. but the car will not start. the injectors are getting electric as i tested them with a test light. I sprayed a tiny bit of gas into the throttle body and it started but imedietly stalled. this tells me it is getting spark. i dont know what else to do. please help
Aug 21, 2010 at 7:07 AM
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KHLOW2008
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Hi mattybetts,

Thank you for the donation.

Did you test the injectors circuit for pulsing while cranking?

Was any other repairs carried out prior to this occurring?
Aug 21, 2010 at 8:00 AM
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MATTYBETTS
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i used a test light to test the injector plugs, in which there was current to every one of them. i did not check the pulse . is there a easy way to do this?
and no other repairs were done prior.
Aug 21, 2010 at 8:11 AM
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KHLOW2008
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The injector curcuits are grounded by the PCM and to test if they are pulsing, you would need a noid light.

Disconnect the injector coupler and connect the noid light across the 2 terminals.
Crank engine and note if the noid light pulses. No pulsing means the PCM is not grounding the circuit and it could be bad.
Aug 21, 2010 at 8:21 AM
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MATTYBETTS
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how would i repair the short in the pcm
Aug 21, 2010 at 1:44 PM
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KHLOW2008
  • CAR REPAIR CONTRIBUTOR
  • 41,814 POSTS
If the PCM is bad, you would have to replace it or send it to someone who do rebuilds on them.

Before confirming if it is a PCM problem, check the continuity between the injectors and the PCM.
Aug 21, 2010 at 11:31 PM
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