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Old 02-14-2012, 11:11 PM   #1
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jeep dies but restarts very well again

I bought a 2000 tj and it will die at stop lites and when i am in reverse idling. It always restarts very strong but sometimes i have noticed when it dies it gives a exhale or inhale sound of air, i have replace the crankshaft relay,problem still persists.If i keep my foot on the accelerator and keep idle up toward 900 rpm it will stay running.Can anyone give me a clue where to look next. It is a 4.0 engine, no engine light comes on and not sure about codes

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Old 02-15-2012, 01:21 AM   #2
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My bet is a sticky/dirty idle air controller. Attached to the throttle body, the IAC is what provides all of the engine's air at idle when your foot is off the gas. When it sticks, the engine can't get enough air at idle so the engine will either idle poorly or die whenever you're not stepping down on the accelerator pedal to let air into the engine.

Buy a can of aerosol throttle body cleaner and with the engine running, clean the throttle body's interior using the instructions on the back of the can. Get as much of the cleaner into the IAC's air passage inlet slot above the butterfly valve plate as you can, that is how the air gets to the IAC and how to get it cleaned. The engine will die as you squirt cleaner into the idle air control passage inlet but that's ok, just restart the engine when that happens.

If this doesn't clear the problem entirely, the IAC is only held onto the throttle body by two small torx screws which means the IAC can be easily removed and cleaned with a soft brush and the throttle body cleaner. Clean the hole its plunger fits into too. Don't push/pull/spin the IAC's plunger.

This is an easy one-banana job.
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Old 02-15-2012, 10:03 PM   #3
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Thank you for your input, i will try this and hopefully it will solve the problem....
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Old 02-16-2012, 12:42 PM   #4
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I don't know if you have a std. trans or an automatic, but my sons ZJ was doing the same thing and one day he said he thought his auto trans was getting low on fluid so we checked it and found it to be 2 quarts low, after we filled it he found that it didn't die at stops anymore. Seems strange to me but why ask why?

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Old 08-29-2012, 11:59 AM   #5
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Quote:
Originally Posted by Jerry Bransford View Post
My bet is a sticky/dirty idle air controller. Attached to the throttle body, the IAC is what provides all of the engine's air at idle when your foot is off the gas. When it sticks, the engine can't get enough air at idle so the engine will either idle poorly or die whenever you're not stepping down on the accelerator pedal to let air into the engine.

Buy a can of aerosol throttle body cleaner and with the engine running, clean the throttle body's interior using the instructions on the back of the can. Get as much of the cleaner into the IAC's air passage inlet slot above the butterfly valve plate as you can, that is how the air gets to the IAC and how to get it cleaned. The engine will die as you squirt cleaner into the idle air control passage inlet but that's ok, just restart the engine when that happens.

If this doesn't clear the problem entirely, the IAC is only held onto the throttle body by two small torx screws which means the IAC can be easily removed and cleaned with a soft brush and the throttle body cleaner. Clean the hole its plunger fits into too. Don't push/pull/spin the IAC's plunger.

This is an easy one-banana job.
Jerry,

Thank you for the clear instructions. You saved me a lot of trouble.

Royce
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