Question about Chevrolet 1500

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CHANGED KNOCK SENSOR STILL HAVE SAME PROBLEM AS BEFORE...IDLES OK BUT STILL SHAKES WHEN I PUT IT IN GEAR. DO I NEED ANOTHER TYPE OF DIAGNOSTIC TOOL TO SOLVE THIS PROBLEM? ALREADY SPENT $200 WITH NO CHANGE.Z71 4WD AUTOMATIC 5.7

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  • momanem May 30, 2010

    1998 CHEV Z71 5.7

  • momanem May 30, 2010

    IT WILL REV AND IDLE @ 3000 AND HIGHER IDLES AT ABOUT 700 HAS JUST A LITTLE SHAKE BUT HARDLY DETECTIBLE.

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  • Chevrolet Expert
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Hello! Need year of your 1500...I can fix your vehicle's fault with a little more information; does engine idle properly...can you increase throttle to 3000 rpm in neutral?

Send year and info...Guru...........saailer

Posted on May 29, 2010

  • David Burbee
    David Burbee May 30, 2010

    Hello! Do an inspection of the throttle body air inlet valve...Check for carbon fouling...Does the throttle plate open freely? Clean if necessary...The Throttle Positioning Sensor (TPS) is bolted to the throttle body...Has three wire connector; Dark Blue...Gray and Black...Connect a voltmeter to the rear of the connector (use paper clips)...Positive lead to the Dark Blue and negative to the Gray wire...At idle you should read less than 1 volt (.8 to .9)...Slowly increase the throttle...The voltage should rise "Smoothly" to 4 volts at full throttle...If the voltage jumps,skips or acts erratically the Throttle Positioning sensor is defective...

    I want to test components and eliminate them one by one without you spending your hard earned cash...This is a common problem on your vehicle with a laundry list of faulty sensors...

    Let me know what you find.............Saailer


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