Motor hesitation and stopping

Tiny
RONECLARK@1946
  • MEMBER
  • 1993 GMC SIERRA
  • V8
  • 2WD
  • AUTOMATIC
Enter your question. I have a '93 GMC V8 serra PU. I have replaced the Plug wires, plugs, fuel filter, rotor button. Then engine continues to hesitate when taking off and some times "dies" when slowing down. Some time the "service engine soon light" comes on. When the switch is turned off and turned back on, the kight stays off. I have had a complete tune up and all these thing continua to happen. What do I do next?
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Saturday, November 27th, 2010 AT 4:21 PM

3 Replies

Tiny
WRENCHTECH
  • EXPERT
The "check engine" light is an indicator for a system that monitors many electronic functions in the system, also called the "malfunction indicator lamp" (MIL). It can come on for any of hundreds of different causes from any of the systems that the computer monitors. Some are very important and can lead to further component or engine damage and some are emissions related not as serious but still a problem and need to be repaired.

Your first step is to have the computer scanned to retrieve the trouble codes that were set when the check engine light came on. On your vehicle, you can jump the A&B terminals of the diagnostic connector to make the check engine light flash the codes. Those codes will give you specific information about what the computer saw and will get you pointed in the right direction to find your problem. Once you have these code numbers, we can be a lot more specific about what your problem may be.
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Saturday, November 27th, 2010 AT 4:25 PM
Tiny
RONECLARK@1946
  • MEMBER
I have had the scan with out the light, and no problems show up
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Saturday, November 27th, 2010 AT 4:44 PM
Tiny
WRENCHTECH
  • EXPERT
If the light came on, even if it went back out, then there is a code stored. The only way that won't happen is if either someone clears it or there is a problem with the ECM itself.
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Saturday, November 27th, 2010 AT 5:26 PM

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