idling fast & glowing exchaust manifold
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Joined: Feb 2011
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From: middle of effin no where, WA
Year: 1998
Model: Cherokee
Engine: 4.0l
correction: a rich condition will run cooler, spastic idle, heavy exhaust, and foul plugs. a lean condition will cause high idle, burn clean, and verry hot exhaust, like a oxy-acetlyene torch. add air, it gets hotter. harleys are notorius for it. that's when you see the chrome pipes turn blue. either way, it's and air/fuel mixture problem.
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Joined: Nov 2009
Posts: 15,197
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From: Aberdeen, MD
Year: 1995
Model: Cherokee
Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts
yes that's true but his symptoms show unburnt fuel is exiting into the exhaust manifold and then igniting. Too much fuel to burn = running rich also.
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Joined: Feb 2011
Posts: 1,707
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From: southern indiana
Year: 92
Model: Cherokee
Engine: 4.0
Lol I'm sure its something simple . Prob where I had the breather out and prob pulled a line off , I hope , she's not running rough just idling real fast
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Joined: Feb 2011
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From: southern indiana
Year: 92
Model: Cherokee
Engine: 4.0
Well I took vaccum line off map sensor and she idle down , but was loading up. Does that mean the sensor is bad . Don't mean to sound stupid ,but I'm new to this
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Joined: Feb 2011
Posts: 1,707
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From: southern indiana
Year: 92
Model: Cherokee
Engine: 4.0
Thanks for the I think I finally found the prob. Tps is bad I unplug it and runs fine . Will it hurt to run until I get a new one trying find one in junkyard a new one is 150
Last edited by highwater; Mar 10, 2011 at 06:16 PM.
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