Injectors not working on Chevy C1500

Tiny
ALLABOUTCHEVY
  • MEMBER
  • 1988 CHEVROLET CHEYENNE
  • V8
  • 2WD
  • AUTOMATIC
I have a 1988 Chevy c1500. Fuel injectors aren't letting fuel into the throttle. The fuel pump comes on and im getting fuel pressure. I just changed the computer but nothing changed. Is there any other sensors that control the injectors. Its a 5.7 tbi.
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Thursday, February 3rd, 2011 AT 1:51 AM

8 Replies

Tiny
WRENCHTECH
  • EXPERT
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.

2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
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Thursday, February 3rd, 2011 AT 2:08 AM
Tiny
ALLABOUTCHEVY
  • MEMBER
Im getting spark on all plugs. Im not getting pulse though. Im getting power to one side of the injectors. I noticed when I ground out the other side the injector stays on.

Thanks
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Thursday, February 3rd, 2011 AT 2:17 PM
Tiny
WRENCHTECH
  • EXPERT
Yes, that's how an injector works. The computer pulses the ground. Is you're check engine light coming on for bulb check when the key is turned on?
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Thursday, February 3rd, 2011 AT 4:32 PM
Tiny
ALLABOUTCHEVY
  • MEMBER
Yes the check engine light comes on but I don, t get any codes but 12 meaning no problems detected.
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Thursday, February 3rd, 2011 AT 5:21 PM
Tiny
WRENCHTECH
  • EXPERT
Things are starting to look like a bad ECM but before concluding that all inputs and outputs to the ECM would have to be tested and confirmed.
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Thursday, February 3rd, 2011 AT 6:46 PM
Tiny
ALLABOUTCHEVY
  • MEMBER
That's what I thought but I changed the ECM and had the same problem so I traded it for another one but still the same problem. Could it be a bad ground or the calpak in the ECM.
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Thursday, February 3rd, 2011 AT 6:51 PM
Tiny
WRENCHTECH
  • EXPERT
I already told you what needed to be done. Throwing parts at a problem will rarely fix it.
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Thursday, February 3rd, 2011 AT 6:57 PM
Tiny
ALLABOUTCHEVY
  • MEMBER
I found the problem. It was a bad wire coming from the ignition module. Thanks for your help.
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Thursday, February 3rd, 2011 AT 9:11 PM

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