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Old 11-12-2008, 09:05 PM
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Need help she wont run right?

Hi, i have a 1999 tj 4 cyl. on some days when you start her up she wont idle next day its fine.might happen once a week or not for 2 weeks but anyway it will stall.if you give it gas or drive it away it wont miss a beat.if you push in the cluth the tach will drop to 5000 or completly die it usually runs just under 10000 i assume it has something to do with the choke or a sensor or maybe o2 sensor? i have changed plugs and wires and run fuel injector through it.Whats going on with her im about to get laid off hoping to make it to xmas so i just cant be throwing parts in her any help would be greatly appreciated Thanks Jeepman
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Old 11-12-2008, 09:22 PM   #2

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Welcome, I should really know the problem, but I can recall the parts or part it might be. I want to say the MAP senor but I think that is way off. Hopefully someone will chime in with the correct thing

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Old 11-12-2008, 09:25 PM   #3
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First guess would be throttle position sensor, you typed 5thousand and 10thousand I think you mean 500 and 1thousand. If you have a meter or digital voltmeter you can unplug the throttle position sensor on the back of the throttle body facing the firewall, stick the meter on there and set it to ohms, then operate the throttle by hand, watch the meter, it should go up and down in resistance smoothly. The other thing that effects idle is the sensor on the throttle body facing the valve cover, remove it and clean it. It's the IAC or Idle air controller, when it gets dirty and blocked it cuts off air at idle.
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Old 11-13-2008, 08:33 AM   #4
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Is the CEL on?
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