91 firebird 3.1 V-6

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hoppper9 - 25 Mar 2007 06:50 GMT

My daughters 91 firebird quits and will not restart for a while. It will
turn over but not start? I l went to pick up her car because she said it quit
on her again. We just had the ECM unit replaced, the mechanic thought that
was the problem. I went to the car and tried to start it and it would only
turn over. I winched it on to my trailer. I then went to turn off the key and
thought I would try it and it started? Anyone have any similar problems?
Thanks for your help.

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Terminal Crazy - 25 Mar 2007 09:30 GMT

> I then went to turn off the key and thought I would try it and it
> started?

Either a loose/broken cable or VATS (not sure if VATS allows it to crank)

Does the fuel pump prime ? Does it smell of fuel ?
Have you checked for a spark ?

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Mitch - 1995 Z28 LT1 M6 terminal_crazy@sand-hill.freeserve.co.uk
Lancashire England http://www.sand-hill.freeserve.co.uk/terminal_crazy/

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Cy Welch - 25 Mar 2007 16:52 GMT

>> I then went to turn off the key and thought I would try it and it
>> started?

> Either a loose/broken cable or VATS (not sure if VATS allows it to crank)

> Does the fuel pump prime ? Does it smell of fuel ?
> Have you checked for a spark ?

It would not be VATS as that would not allow it to crank. I would
recommend checking the ignition module, fuel pump and the coil packs
(IIRC the 91 v6 had coil packs already). It sounds like either fuel
delivery or spark. You also probably should check the different
sensors. One to check would be any/all crank position sensors, since if
they fail once they get hot there would be no spark or fuel since the
computer needs those pulses to time both spark and injectors. I know
that the coil in the distributer in the v8's can go out and can show
exactly those symptoms, but I'm not sure what takes it's place in the
v6's as I don't think they have a distributer.

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Cy Welch
89 Camaro RS 5.0 TBI
98 Passport
03 Malibu

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hoppper9 - 25 Mar 2007 20:06 GMT

The fuel pump was replaced last year and has been working fine. And since it
started at a later time I would consider your crank sensor to be a good idea.
Is there a way to check the ignition module? Or is it a part you just have to
replace and hope you get the right one?

>>> I then went to turn off the key and thought I would try it and it
>>> started?
[quoted text clipped - 14 lines]
>exactly those symptoms, but I'm not sure what takes it's place in the
>v6's as I don't think they have a distributer.

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hoppper9 - 25 Mar 2007 20:10 GMT

The fuel pump was replaced last year and we have not had any problems with it.
Another guy thought it could be the crank sensor. What is your opinion?

>> I then went to turn off the key and thought I would try it and it
>> started?
[quoted text clipped - 3 lines]
>Does the fuel pump prime ? Does it smell of fuel ?
>Have you checked for a spark ?

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