Question about 1998 GMC Jimmy

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98 Jimmy has 5 codes (multiple misfire; egr; mass air flow; intake air temp; manifold pressure) Was dogging out on me and the other day it quit. Now it turns over but will not start. Checked and it is getting fuel and fire.

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  • jaredanielle Jul 29, 2009

    Could the mass air flow sensor cause it to not start?

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  • 155 Answers

I would start with the Mass Airflow and EGR sensors first, because they can cause the misfire codes and the intake pressure and temp. Just because the air filter and hoses are clean and free flowing doesnt mean the computer can see that. If your Mass Airflow sensor died, as far as the computer is concerned, there is no air going into the engine.

Posted on Jul 28, 2009

  • John DeCosta
    John DeCosta Jul 29, 2009

    Yes absolutely. Sometimes you can get lucky and tap on the mass airflow sensor itself and the engine will start. A bad mass airflow will tell the computer no air is coming in, so the computer will shut off the fuel flow to match the air.

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