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Chevy 5.7 TBI Sputter

My friend has an 87 K2500 Witht the 5.7 TBI engine. when its started in the mornings and the engine is cold it fires up normal runs for about a minute then dies. Also at heavy throttle it looses power and sputters badly. We have checked timing, rebuilt the throttle body, new injectors, complete tune up. plugs wires cap rotor. and there is no SES Light or Check engine light. Possible Knock Sensor issues?? Can headers screw with that sensor this much?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

csmock132
  • 4669 Answers

SOURCE: 87 chevy truck with TBI idles too fast

Spray the intake with carb cleaner to find the vacuum leak. Check where the EGR mounts and the throttle body gasket sense you had both off.

Posted on May 10, 2009

  • 14 Answers

SOURCE: high idle CHevy 350 TBI

check if went from a V6 TO V8 need power two more cylinders

Posted on Jun 21, 2009

  • 4088 Answers

SOURCE: 1987 chevy s10 2.5l tbi will not start. changed

That eliminates the crankshaft and camshaft position sensors. Have you checked the fuel injector itself for an open winding or stuck valve plunger? There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. But at least the engine should try to run if poorly. Take the injector out, dry it off with air, and intermittently apply 12 volts to one terminal while grounding the other. You should hear a click from inside every time you touch 12 volts. If not, replace it. If it does, it may be plugged with debris. Try blowing through it in reverse with compressed air.

Posted on Jul 17, 2009

  • 5 Answers

SOURCE: 1987 Chevrolet S-10 Pickup1987 chevy s10 2.5l tbi

Check the trottle body postioning sensor...

Posted on Jul 19, 2009

pippall
  • 1486 Answers

SOURCE: 1987 chevy S10 engine idle problem

relace the throtle air idle valve.The temp switch will allso cause this problem.

Posted on Jul 19, 2009

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