Question about GMC Jimmy

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Bad gas mileage

I get about 8mpg on my 96 4.3 jimmy. I am aware of tire pressure. doesnt idle rough. purrs like a kitten, no check engine light. what should i check into?

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  • 35 Answers

Your cylinder heads/valves could be coated with carbon absorbing fuel. that's only if you need to use a lot of throttle while driving. or even partially clogged/clogging injectors. are the oxygen sensor(s) working correctly? they could be showing no voltage meaning your car is running lean (not enough fuel) so the ecm tells the to increase pulse width ( supply more fuel)

Posted on Oct 17, 2013

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Posted on Jan 02, 2017

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  • 51 Answers

SOURCE: 2005 chevy colorado runs rough and gets bad gas mileage.

Sounds like it needs spark plugs and wires, and a fuel system treatment.

Posted on Oct 08, 2008

  • 36 Answers

SOURCE: HARD TO START WHEN COLD AND WHEN IT DOES IDLES BAD AND STALLS.

Try replacing the ignition control module it is located under the distributor cap Cost is around $30.

Posted on Jan 11, 2009

  • 141 Answers

SOURCE: Engine runs rough after about ten minutes /idles really low

Just trowing some suggestions out there, but, I would check the idle air control valve (solenoid) or the throttle position sensor. If they check out then my last guess would be the map sensor or the vaccuum to the map sensor. Hope I was able to help. Best wishes.

Posted on Jan 17, 2009

countrysi248
  • 443 Answers

SOURCE: rough idle, backfire on acceleration

check everything you can under the hood your air intake system all of it especially make sure all clamps are tight .. and make sure all vacuum hoses are good and not cracking or broken or just loose . you might run a little fuel cleaner through a tank of gas too cleaning the engine fuel system up some. just a few ideas.. Jerry

Posted on Apr 12, 2009

  • 5 Answers

SOURCE: Rough idle only when engine is cold

where is the egr valve located? i haven't seen one on mine...??

Posted on Nov 17, 2009

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