Question about 1991 Chevrolet S-10 Blazer

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Will not idle.

Have a problem with my 1991 Chev. S-10 Blazer not idling. Have replaced cap & rotor, spark plugs and fuel filter. Any other suggestions would be appreciated.


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Plug wires are crossed

Posted on Oct 17, 2008

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Checked all hoses (replaced one) and still had the same problem. No codes @ first, THEN after fuel filter change, full tune-up, oil change, etc. Got codes 13 and 33. No Mass Air Flow Sensor on 91 Blazer's, so check the MAP Sensor (Autozone can test for free) or as in my case... O2 Sensor.

Posted on Oct 04, 2008

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Had the same problem. Check the TPS(throttle position sensor).

Posted on Sep 15, 2008

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Hi Riggsby!

I assume you have the 4.3 V6 with throttle body injection... If not, let me know.

I would take a look at the Idle Air Control valve (IAC) first. Also make certain all vacuum lines are connected and not leaking.

If this does not help, take it to AutoZone (or other automotive supply that offers free scans) and have them run an OBD scan, looking for any trouble codes (they will decipher trouble odes for you).

Is idling the only problem, does it run okay otherwise, or are there other less troubling problems with engine performance?

Hope this sheds a little light on the subject, good luck, and let us know if you have further questions or comments...


Posted on Jun 17, 2008

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your oxygen sensor is probably bad

Posted on Jun 17, 2008

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