1996 Chev 1500 Pick-up Won't Start - Fuel System

Question: When cold car starts right up. After running during warm/humid temps car will not restart till cools down. Had trouble last fall when hot out, trouble went away all winter now has returned with warm temps. What's Up?

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Technican: Hi; Have you ran a diagnostics test and see what the codes are. There could be a couple of possibilities. One it can be an ignition problem. The other it can be a fuel problem. Please send me back the results from the diagnostics and then I can better help you figure it out. .

Technican: Hello, When the condition is present does the starter turn over the engine but the engine won't start, or, is it that the starter won't do anything until things cool down? What engine, please? Have you had the starter amp draw tested? It should not exceed 175amps draw. Battery cable connections clean and tight? Is the battery big enough for the vehicle (cold cranking amps)? Please advise.

Owner: Starter turns over fine, car might start(run) for a second then quit and not restart, until the weather is cool, after sundown, etc., usually 80+ degrees is the killer. Chev 4.3 v6, cables clean and tight, Battery fine. Does warm weather effect battery performance?

Technican: Warm weather effects starter amp draw but your starter is working so I doubt the battery is at fault. When the condition is present I would want to attach a scanner (not a code reader) and see the value of the crankshaft sensor. This sensor can drop out in high temperatures and never set a code. If the scanner shows an incorrect value for this sensor, that is where I would start. A wrong value here means no spark. I've actually sprayed a hot (still connected) crank sensor with brake parts cleaner to cool it down and got a stranded vehicle to start right up. I replaced the sensor and that was that. Your thoughts?,

Owner: It's gonna be hot tomorrow, I'll pick up a can of air, and give it a shot, u might be on to something, I'll reply tomorrow, so give me something to reply to. Thanks

Technican: What I used was a can of brake parts cleaner. It comes out cool and evaporates quickly. It is a solvent, so be aware of what will wash off and where it will drip onto the ground or driveway. It is not an "always works" method but an inexpensive thing to try if you don't have a scanner.

Technican: Hello, any change in the status of this question? Just checking in with you,

Technican: Still need help here?

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1996 Chev 1500 Pick-up Won't Start - Fuel System

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