Question about 2001 Chevrolet Blazer

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Why would a Chevy Blazer ZR 2001 have quickly fluquateting RPMS and sound rough while running after doing a timing kit change?

The RPMS will go from 1500 to 2000 and back in one fast jump. Sounds like its misfiring and running rough. Just finished a timing change on it while the original problem was the fuel regulator came undone.

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  • 34 Answers

Probabitly the timing was not set right use a timing gun to see if the truck has the correct timing you may be off a tooth.

Posted on Nov 05, 2012

  • woodwardj84
    woodwardj84 Nov 05, 2012

    No defenately not the timing that i know is right



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Posted on Jan 02, 2017

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SOURCE: 1993 chevy S10 blazer 4.3 vortec

Had a similar probelm, cleaned the EGR valve and problem went away.

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SOURCE: cylinder 2 misfire on a 1998 chevy blazer

check your plug wires for tears and dont overlap them

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SOURCE: 1997 chevy truck running rough

97 chevy 1500 4x4 replaces plugs wires cap rotor dist pick up and crank sensor truck run good when cold as soon it heats up and comes to stop it feels like it boggs down runs rough and stalls any idea what to do?

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SOURCE: have code for cylinder #1 misfire on 96 chevy

these were bad for the spider injectors to fail. they are hard to diagnose with out the scan tool. the poppets in the end of the injectors get clogged and will need to be replaced. pull the plug and see if its oil fouled. they also have a problem with the #1 cyl getting out of round and oil fouling the plug. compare it to another plug in the engine. if its oil fouled the engine is no good.

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SOURCE: 1997 Chevy pickup running rough

injectors may dirty run a pint of marvel mistery oil in a tank of ethel gas in your truck

Posted on Oct 24, 2011

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