92 Chevy Pickup won't start when warm (sometimes)

I remember reading a while back that the ignition modules sometimes go bad on the 4300's. What you describe is typical of _other_ GM ign.modules going bad, like on the 3100's to 3800's.

Have you checked the coolant temp sensor? Sounds like it might be out of range.

KM

And somewhere around the time of 02/15/2004 11:28, the world stopped and listened as « Paul » contributed the following to humanity:

TFI modules on Ford ECC-VI systems fail in similar ways. What is described sounds like an electronic part slowly dying.

Mechanics don't fix cars unless they develop symptoms. Why not build a tool to find the problem.

Let's say you have a distributor less system (DIS) ignition system with 1 modules and 4 coil packs. If so, then they're dangerous to check for sparks.

You will need LEDs, a 350-Ohm resistors, copper wires, a switch. When the car refuses to start, flip the switch, jump a wire, stand back and begin cranking.

Sorry, I will stop here leaving out major details since I don't have circuit drawings for your system. But it's good to know that you "can" build an inexpensive diagnostic tool.

-- Milo

((some snippage))

Followup Report:

And the winner is... (looks into envelope):

Ignition Module!

Thanks for the help, everyone.

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The Final Followup Report:

Got the new ignition module. Ran great.

Had a hole in the muffler so I fixed that on Monday morning, thinking "Finally, everything on my truck is running great!"

Monday afternoon, a guy failed to yield right-of-way (I was on a four lane, one-way main street approaching an intersection. No lights or stop signs on my street, it was just your ordinary type of major downtown four lane street with some smaller side streets left and right (with stop signs for the side streets).

The guy at the side street (left side) didn't see me, and blazed across the intersection right in front of me. I went into a four wheel locked brake slide, but not good enough. He never saw me until he looked up with very wide eyes while I was looking down through his passenger window at him (still skidding, by the way).

Bottom line: no major injuries (just your normal bumps and bruises); my '92 blue Chevy pickup is totaled, and his 2000 Acura don't look so good either.

Damn, I liked that truck.

DJ

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I am pleased to hear you were not severely injured!

KM

: > > (92 Chevy, 5-speed, V6, 103k miles, blue) : > >

: > > After I've been motoring for awhile (an hour or two) and then turn the : > > engine off (to get gas, or instance), my truck will often not start. : > > The starter will turn the engine but never a spark, nor a hint of a : > > start. No misfires, no coughs, just the sound of the starter. And : > > not always. When it is cold (from sitting overnight), it

: > ((some snippage)) : >

: > Followup Report: : >

: > And the winner is... (looks into envelope): : >

: > Ignition Module! : >

: > Thanks for the help, everyone. : : : The Final Followup Report: : : Got the new ignition module. Ran great. : : Had a hole in the muffler so I fixed that on Monday morning, thinking : "Finally, everything on my truck is running great!" : : Monday afternoon, a guy failed to yield right-of-way (I was on a four : lane, one-way main street approaching an intersection. No lights or : stop signs on my street, it was just your ordinary type of major : downtown four lane street with some smaller side streets left and : right (with stop signs for the side streets). : : The guy at the side street (left side) didn't see me, and blazed : across the intersection right in front of me. I went into a four : wheel locked brake slide, but not good enough. He never saw me until : he looked up with very wide eyes while I was looking down through his : passenger window at him (still skidding, by the way). : : Bottom line: no major injuries (just your normal bumps and bruises); : my '92 blue Chevy pickup is totaled, and his 2000 Acura don't look so : good either. : : Damn, I liked that truck. : : : DJ : ------------------------------------------------------ : preface email addie with 'd' to defeat anti-spaminator

Thank you. We were very fortunate as was the driver of the other car.

DJ

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