'00 360 crank-no-start problem

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Tom Lawrence - 21 Jan 2009 13:16 GMT

I've got a friend's 360 that won't start. It turns over fine (got a fresh
battery), and on occasion, you can hear it try and fire. Fuel pressure/flow
have been verified - injectors all cleaned and bench-tested. No spark at
the #1 wire - spark at the coil wire, but only 1 spark per revolution of the
engine. No codes set, even after a cumulative 60+ seconds of cranking.

I would expect that either a bad crank or cam sensor would set a code, but
the fact that the coil's only firing once per revolution leads me to think
the crank sensor's providing false data.

Thoughts/ideas?

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ds549@webtv.net - 21 Jan 2009 13:53 GMT

id try crank sensor. no codes from that going bad.. did you check
injectors with ohm meter also?

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Steve Lusardi - 22 Jan 2009 17:33 GMT

Tom,
If you are asking, this problem must be unique.I hesitate asking these, but
I would put a scope on the coil primary (low voltage side) and check for
trigger pulses. I would also put the scope on actoss the individual
injectors for the same reason. I expect you will see no injector triggers
and one trigger per rev at the coil. If so, I would expect the cycle clock
is not counting in the computer indicationg a bad computer or a continuous
reset on the computer. This is inline with the no code indication. Does the
computer react to DRB3 commands?
Steve

> I've got a friend's 360 that won't start. It turns over fine (got a fresh
> battery), and on occasion, you can hear it try and fire. Fuel
[quoted text clipped - 8 lines]
>
> Thoughts/ideas?

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