Question about GMC Jimmy
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?
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
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
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
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