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Unread 01-28-2011, 05:46 PM   #1
hobigusn
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2004 TJ Wrangler 
 
Join Date: Sep 2010
Location: Sterling Heights, California
Posts: 26
2004 California TJ idle speed fluctuates

My 2004 tj has an intermittent problem. At idle the rpm fluctuates. It will drop to 1 1/4 dot on the tach (400-450rpm I think). It will stay that low until you tap the gas. Idle speed goes to about normal rpm but flucuates by a needle width. I've been chasing this problem for awhile. I found a piece of metal (wire rope strand about 1 inch long) stuck to my crankshaft sensor. I remove it and replaced the sensor because I already bought one. Before changing Crankshaft sensor the jeep would stall in stop and go traffic. Now it doesn't stall but it doesn't have a smooth or steady idle. I've done a tune up, camshaft sensor, speed sensor, idle air controll module, map sensor, throttle postion sensor and up stream O2 sensors. Any idles?

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Unread 01-28-2011, 06:02 PM   #2
GOLENJEEPTJ
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2002 TJ Wrangler 
 
Join Date: May 2007
Location: Ventura ,CA., California
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When you replace all of those items did you give the throttle body a good cleaning?I mean like taking it off the intake manifold?Check all you vacuum hoses and fittings for looseness,cracking,etc.
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Unread 01-28-2011, 06:17 PM   #3
hobigusn
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2004 TJ Wrangler 
 
Join Date: Sep 2010
Location: Sterling Heights, California
Posts: 26
Quote:
Originally Posted by GOLENJEEPTJ View Post
When you replace all of those items did you give the throttle body a good cleaning?I mean like taking it off the intake manifold?Check all you vacuum hoses and fittings for looseness,cracking,etc.
I cleaned the throttle body really good. But idk about the vacuum hoses. Where are they and what are they attached to? I did't think fuel injection had vacuum hoses.
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