Question about 1996 Chevrolet Blazer

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1996blazer runs good, get up to 30-35 hesitates until let off gas and press again, when it hesitates black smoke and sputtering

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  • Chevrolet Master
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If the above answers don't work for you, the cat converter could be blocking up.

Posted on Jun 03, 2017

  • 2 more comments 
  • Randy K Jun 03, 2017

    Thank you, going to check that.

  • Randy K Jun 03, 2017

    Going to pull cat and maybe see if it is clogged.

  • Joe Stanton Jun 04, 2017

    Check for exhaust flow at the tail pipe for cat test.

  • Joe Stanton Jun 04, 2017

    Remember do the cheapest fixes first. check the coolant temp sensor, it may have the ECU in open loop mode (cold, fuel rich).

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First change the Air filter, Then perform an OBDII scan of the stored fault history. Look for a (MAF) mass airflow sensor or (MAP) manifold absolute pressure sensor. The only sensor that is subject to physical wear(1996, age) is the (TPS) throttle position sensor. Let the OBDII scan be your guide to any repairs to avoid buying parts you don't need. A dirty air filter can put the mass airflow sensor out of range. Do the cheapest fixes first.

Posted on Jun 03, 2017

  • Randy K Jun 03, 2017

    Obdll showed maf sensor, changed, now no code still doing same. Thanks for input!

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It sounds like you might have a misfire that is causing the engine to run rich, hence the sputtering and black smoke. When is the last time that you replaced the spark plug wires and the spark plugs? If the 1996 plug wires are like the 1997 plug wires used on the 4.3L S-10, they can be pretty difficult to get a reliable connection at the distributor cap.

Posted on Jun 03, 2017

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Posted on Jan 02, 2017

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This seems almost text book to me... I would have someone local to you to have a look at it to be sure.

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