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My 96 Silverado, 5.7 TBI had a bad back fire the other morning just as I was starting it and a flume of white smoke from under the hood. Now when I start it, it will rev upto 5k then die. Changed both TPS and idle air control valve, (both the peices on throttle body) and still the same. I reset the computer by disconnecting the battery so now no codes....PLEASE HELP

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  • Jon Boisvert
    Jon Boisvert Jan 21, 2013

    Thanks for looking at my problem, Had a guy come over and look at it and he said the manifold (intake) was cracked, they are basicaly plastic and it was starting ti go bad, when it back fired it more than likely did it in. He also stated to check the timing after repair as it should not back fire in the first place.... does this sound correct... Jon

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6 Suggested Answers

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Posted on Jan 02, 2017

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csmock132
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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

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ourhowse
  • 2007 Answers

SOURCE: white smoke coming out tailpipe

If your intake gaskets are leaking, when you dump soapy water on the gasket, it should bubble like crazy ( when it's running). If you can, run it with the rad cap off and watch for bubbles. If it keeps bubbling, you probably have a head gasket problem.

Posted on May 15, 2009

  • 144 Answers

SOURCE: code p0121 TPS

THERE IS A TP SENSOR BUILT INTO THE THROTTLE ACTUATOR. THESE TRUCKS HAVE BEEN KNOWN FOR A FEW PROBLEMS IN THIS AREA. THROTTLE ACTUATOR IS NOT SERVICEABLE. THE THROTTLE BODY WILL NEED TO BE REPLACED IF IT IS PROVEN FAULTY. THE APP SENSORS ARE LOCATED IN THE GAS PEDAL MODULE. THESE SEND SIGNAL TO COMPUTER TO TELL IT WHERE YOUR FOOT IS, THEN COMPUTER SENDS COMMAND TO THROTTLE ACTUATOR TO OPEN OR CLOSE THROTTLE BASED ON THIS INPUT. THE SENSOR IN THE THROTTLE ACTUATOR DELIVERS A MESSAGE BACK TO THE COMPUTER TO TELL IT WHAT THE ACTUAL THROTTLE POSITION IS. IF THESE SIGNALS DONT MATCH(WHERE THROTTLE IS COMMANDED AND WHERE IT ACTUALLY IS)THE CHECK ENGINE LIGHT WILL ILLUMINATE AND THE VEHICLE COULD GO INTO A REDUCED POWER MODE. HOPE THIS HELPS YOU!

Posted on Sep 07, 2009

wracefans24
  • 1985 Answers

SOURCE: Throttle body was changed on a 2001 Chevrolet

If your getting a check engine light on the dash,you need to correct the problem first,If you want to clear codes from the computer,you will need to unhook the battery for about 1min.
But there is no resetting of the computer.If your truck is idling rough and dying,you still have a problem somewhere,You should be looking for any vacume leaks,or one of the sensors on the throttle body like the IAC,idle air control,

Posted on Dec 20, 2009

  • 192 Answers

SOURCE: 1994 chevy with 5.7 L

Sounds like you have a vacuum leak. When the engine is cold the leak is there but as the engine warms up the parts start to expand thus closing the gaps and sealing the leak. I had this problem on my personal vehicle and it turned out to be lower intake gaskets.

Posted on Jan 29, 2011

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