1997 Chevy 2500 won't start

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BigIronRam - 18 Jul 2007 12:34 GMT

Hey Guys,

We need a little help from the experts. This a a work truck, 350 Vortec
with 236,000 miles. We've been through several fuel pumps in it's life and
when it wouldn't start this time my shop guys assumed it was another pump.
Well, it's not this time. It's blowing the ECM fuse everytime it's
installed. Without that fuse we can't even check for codes. I suspect the
PCM itself is bad. Is that the unit just behind the battery? Are these
frequent problems or is there somewhere else we should start looking for
problems?

Thanks for all tips and pointers!

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BigIronRam - 18 Jul 2007 12:53 GMT

> Hey Guys,
> Is that the unit just behind the battery?

Let me revise that statement, the unit just behind the little toolbox and
forward of the master cylinder. Is THAT the PCM? And BTW, what does VCM
stand for?

Thanks again!

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BigIronRam - 18 Jul 2007 13:54 GMT

>> Hey Guys,
>> Is that the unit just behind the battery?
[quoted text clipped - 4 lines]
>
> Thanks again!

Update, we've completely disconnected the thing we think is the PCM and it's
still popping fuses.

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BigIronRam - 19 Jul 2007 12:10 GMT

>>> Hey Guys,
>>> Is that the unit just behind the battery?
[quoted text clipped - 7 lines]
> Update, we've completely disconnected the thing we think is the PCM and
> it's still popping fuses.

Found it! The wire to the crank position sensor had gotten up against the
exhaust pipe on the passenger side of the engine and burned in two. This is
a pretty unmolested truck, I'm kinda surprised this happened to it. If you
have one you might want to check the wire routing and make sure it's not
getting close.

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