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Unread 06-17-2009, 01:35 PM   #1
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1997 TJ Wrangler 
Join Date: Jun 2009
Location: michigan
Posts: 1
97 tj only has 55k but now hesistates at first but idles fine

Any help I have been driving my dads Jeep tj this summer, he only uses it pulling from behind his motorhome.
It only has 55k miles and I have put on about 8k in 2 months. This past week it starts up fine and idles normal but when I start going down the street it wants to stall out. I have to put in the clutch as I am driving to keep the rpms up as best I can. After about a 1/2 mile of this it runs fine the rest of the day.
It happens every morning and if I let it sit for any length of time during the day.
I thought it was maybe bad gas, but I refilled 2x. Also I put in some fuel injector cleaner. No help.
97 jeep tj

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Unread 06-17-2009, 01:57 PM   #2
Jerry Bransford
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2004 TJ Wrangler 
Join Date: Jan 2003
Location: Escondido, California, California
Posts: 62,975
First, welcome to JF!

I would start by cleaning the throttle body's interior with an aerosol can of throttle body cleaner. After removing the air intake tube, start the engine and while keeping the rpms up spray the cleaner into the throttle body. Direct some of the spray into the Idle Air Control Passage Inlet per the below illustration. Air gets sucked in through that passage inlet at idle to provide all of the engine's air when the butterfly valve is closed (when your foot is not pressing on the accelerator pedal). That Inlet only sucks in air when the butterfly valve is closed so try to get some of the cleaner spray to go into it at idle though it may tend to try to stall the engine. There is a solenoid actuated plunger (the IAC itself) that controls the air flow through that Inlet which is what you're trying to clean by doing this.

By the way, the butterfly valve is that round plate just below the Idle Air Control Passage Inlet that opens when you step on the accelerator pedal or move the throttle linkage.
Getting Savvy...

When you have a choice, buy American.
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Unread 06-17-2009, 02:03 PM   #3
Jonny Jeep
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1997 TJ Wrangler 
Join Date: Feb 2007
Location: Manchester, UK
Posts: 5,230
Welcome to the forum. In this case what Jerry says may help but the problem is the upstream oxygen sensor. You should take a look at the following thread...

Online factory service manuals and parts lists - http://www.jeep4x4center.com/knowledge-base/index.htm
If it doesn't work properly, look for the service manual link at the bottom of the page.
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