1993 Chevrolet K1500 Logo
Posted on Jan 09, 2010
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Engine cutsout all speeds 89 5.7 liter chev

I have a 89 fullsize blazer have done just about everything i could think of top fix problem it runs fine some times and then just starts running real bad hard to take of spits and sputters and freeway speeds it starts doing same thing

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David Burbee

David Burbee

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  • Chevrolet Master 1,871 Answers
  • Posted on Jan 09, 2010
David Burbee
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Joined: Dec 03, 2009
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Hello! when you say just about everything ; Can you give a brief run-down of what you have done? If you have not checked all vacuum lines for breaks, worn, pinched or loose;Please do so...

There are three very probable causes; Lets eliminate...

#1 Manifold Absolute Pressure sensor (MAP)...Located on the throttle body...Using a volt meter, Measure across pins...Must be greater than 1 volt at idle...If not it's faulty...

#2 Throttle Position Sensor (TPS)...located at the throttle body...Using a volt meter, measure the voltage at the sensor...Must be less than than 1 volt at idle...As you slowly increase the throttle the voltage must rise smoothly to 4 volts at full throttle...If it skips or jumps the TPS is defective...

#3 The Air Control Temperature sensor (ACT)...Located in the top of the air filter box (It is usually green in color)...unscrew the sensor...Inspect the tip for dirt and contamination...If contaminated the sensor is defective...

Send a comment when complete....

Guru...................saailer

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