Question about Chevrolet S 10

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Have a 89 s10 2.5 starts fine idles good for about 2-3 min then idle is erratic revs up good has good power but exhast manifold glows red does this with or with out exhaust /converter on have installe

Also have installed new fuel pump filter plug wires cap rotor rebuilt tbi timing is correct checked ecm connections wiring harness checked coverter new exhaust engine will do this with the coverter on or off the truck

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  • 7 Answers

This series of S10 is notorious for cracking the original circuit board (often called a "half board") of the ECM unit, which is found behind the glove box. A cracked "half board" can cause a wide variety of intermittent drive-ability problems. It took GM's Powertrain engineers a long time to ID this pesky problem, shortly after this ECM was introduced. If you can not find another cause, a new ECM is your likely fix.

Posted on Feb 13, 2012

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Posted on Jan 02, 2017

Louie_3006
  • 79 Answers

SOURCE: My 89' S10 will turn over but not crank?

I would check and see if this is your fuel pump. Spray starting fluid in the throttle body right underneath the air horn and if its starts it's your fuel pump. Try turning your key three times but do not start it the first two times and your third time let it cycle for a second then turn the key to start. If it starts during one of these tests it's your fuel pump. Of course check battery and cables, plugs and wires, fuel in the tank, and starter. Autozone offers free tests on your electrical system. I hope this works for you!

Posted on May 20, 2009

  • 105 Answers

SOURCE: 87 s10 2.5L getting fuel to the throttale body but

check your fuel pressure,check for voltage at wires going to injector with a test light,should flash on and off while cranking over the engine,if not,cam sensor is bad

Posted on Jan 30, 2010

  • 15 Answers

SOURCE: 89 GMC K2500 5.7L TBI not spraying fuel

have you checked the coolant temp sensor? it controls air-fuel mixture.

Posted on Feb 04, 2010

  • 617 Answers

SOURCE: How do you set timing in a 89 Caviler with 2.0 TBI

This Engine uses a Direct Ignition System (DIS) or Distributorless Ignition to control engine timing advance/******. The Electronic Control Module combined with Electronic Spark Timing (ECM/EST) controls the ignition timing. The ignition timing is preset by the manufacture, and no provisions for adjustments are provided.

Posted on Feb 07, 2010

jturcotte
  • 8123 Answers

SOURCE: my ecm 1 fuse blows

The diagram below shows everything that runs on that fuse. Check the wiring on these items for a short. If wiring is good, there is a simple way to see which item is shorting out. Unhook all the connectors (don't unhook the VCM) and put a fresh fuse in. Turn the key on--does the fuse still blow? If yes, there is a short in the wiring. If no, the short is in one of the items you unplugged. Now pulg them back one at a time with the key on. Check the fuse after each item until it is burned. Then you will know which part to replace. My first guess would be the coil. Let me know if you can't find any of these or if you have other questions.

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Posted on Dec 07, 2010

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