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TBI TROUBLE

  • Tiny
  • curiouscaveman
  • 1991 Chevrolet Truck
  • V8
  • 4WD
  • automatic

My chevy K1500 with TBI 5.7 will not start it has spark the fuel pump is working but no fuel comes out of the injectors. What should I check next?

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Saturday, June 25th, 2011 AT 7:32 PM

4 Replies

  • Tiny
  • JDL
  • Expert
  • 16,289 posts

Without rpm signal, there will be no injector pulse. Any applicable mil codes? You can check voltage and ground for the injector/s. Use a gage and check fuel pressure.

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Saturday, June 25th, 2011 AT 7:36 PM
  • Tiny
  • Docfixit
  • Expert
  • 18,993 posts

Most common is faulty Ignition module in DIST

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Saturday, June 25th, 2011 AT 7:36 PM
  • Tiny
  • curiouscaveman
  • Member

I don't have a gauge but disconecting the fuel lines and jumping the relay gets me a good stream of furl to the throttle body. I put a test light in the injectors and one side of each of them has power. I think the white wire on one and the red on the other not sure but one each. Is this right?

How do I test the ignition module in the distributor?

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Saturday, June 25th, 2011 AT 7:45 PM
  • Tiny
  • Docfixit
  • Expert
  • 18,993 posts

Take it to an AutoZone they will test

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Saturday, June 25th, 2011 AT 7:50 PM

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