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Gmc jimmy turns over but wont start

I have a 99 jimmy. Cranks but wont start. Here the facts: changed spark plugs, wires, dist cap and coil, and fuel filter(checked pump pressure while doing this and it was fine) It will usually start after a good five minutes of cranking on a warm day but on a wet day it will never start. So i was thinking it was a ground wire. But that doesn't explain its no start in dry weather.

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  • Cars & Trucks Master
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Are you getting spark to the plugs when it won't start ?
Injector pulse ?
It sounds like something is shorting out when its hot or wet which could be a number of things, including a wiring harness issue.

Posted on Jul 19, 2013

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Posted on Jan 02, 2017

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Go to a library that has a set of the factory service manuals (not Chlton's or Haynes or Motor's). The FSM's will give you all the trouble hotting charts that the dealer techs use.

Posted on Feb 01, 2009

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check the ecm fuse and power wire from starter

Posted on Feb 01, 2009

  • 28 Answers

SOURCE: 99 saturn wont start. cranks no prob, has spark, has fuel,

It may be the crankshaft position sensor needs to be replaced.Suppose to be above and behind starter ,but may be different location on your car. Here go to to get more info very helpful site.

Posted on Mar 29, 2009

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SOURCE: Car fails to start one day and starts the next.

I would check all the relays and the computer .
They could be over heating when coming on for a while then shorting out.

Posted on Apr 01, 2009

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SOURCE: 1998 gmc 4x4 350 vortec ::: problem is when it

Change mass air flow sensor.

Posted on Jul 06, 2009

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Engine cranks over but wont start, I can faintly smell fuel

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You haven't mentioned the engine cranks over or not, so I have to assume it cranks over.
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