1994 GMC SONOMA STARTING

  • Tiny
  • loumsc
  • 1994 GMC Sonoma

Electrical problem
1994 GMC Sonoma 6 cyl Two Wheel Drive Automatic 190000 miles

Will start cold but will not start after warmed up

Have replaced coil wire, plug wires, distrib cap, rotor and plugs

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have the same problem?
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No
Saturday, June 19th, 2010 AT 7:39 PM

3 Replies

  • Tiny
  • internetmechanic
  • Member

Are there any applicable trouble codes? When the problem occurs, have a helper crank it, while you visually check for spark at the plugs. If you have spark everywhere, use a gage and check fuel pressure. Some of the national brand autostores used to loan out a fuel pressure gage if you don't have one.

To test for spark, pull a spark plug wire loose, use a known good plug or spark tester in the boot. Ground metal part of plug/tester to metal part of engine, watch for spark, engine cranking. With temp related issues, sometimes the cts can cause problems? I don't replace anything without trying to be sure.

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Sunday, June 20th, 2010 AT 12:02 PM
  • Tiny
  • loumsc
  • Member

No there are no fault codes, Just sends back code 12 and no other codes. By cts did you mean coolant temperature sensor?

Thanx,
Lou

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Sunday, June 20th, 2010 AT 12:32 PM
  • Tiny
  • internetmechanic
  • Member

I can not tell you the coolant temp sensor is faulty, just one possibility? I'd still want to check for spark and fuel pressure.

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Sunday, June 20th, 2010 AT 2:00 PM

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