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why is my xj doing this

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Old Dec 15, 2012 | 12:28 PM
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Default why is my xj doing this
I have a 96 xj sport 4.0 ho and when i put it in drive the rmps drop to about 500 rpm and when in park goes up to 750 800 rpm what could cause this
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Old Dec 15, 2012 | 12:38 PM
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Cause you spelled awesome wrong?
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Old Dec 15, 2012 | 12:46 PM
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Your torque converter is working. Thats why.
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Old Dec 15, 2012 | 12:56 PM
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Try cleaning throttle body and idle air control. May help with your idle issues...
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Old Dec 15, 2012 | 02:09 PM
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Cleaned Iac and now idles at 500 in park
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Old Dec 16, 2012 | 06:07 AM
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How about the port for the IAC? Definitely sounds like the prob since it has changed... Something like a clothes hanger or small screwdriver can be used to break away carbon from the port.
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Old Dec 16, 2012 | 08:04 AM
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I cleaned the throttle body too so i think the port is clean but I will try that too thanks
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Old Dec 16, 2012 | 10:12 AM
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uhhhh thats normal. when you put it in drive the torque converter is putting pressure on the engine, so the engine bogs down a little bit. 800 rpm idle in park is perfectly normal.
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Old Dec 16, 2012 | 11:26 AM
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Originally Posted by awsomexj
Cleaned Iac and now idles at 500 in park
Really? Mine always idles at 700-800.
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Old Dec 16, 2012 | 12:21 PM
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Originally Posted by thatXJguy
Really? Mine always idles at 700-800.
Actually its more like six
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Old Dec 16, 2012 | 12:24 PM
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Originally Posted by awsomexj
Actually its more like six
That sounds so much more fuel efficient than mine. What the heck did you do?
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Old Dec 16, 2012 | 12:44 PM
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Originally Posted by thatXJguy
That sounds so much more fuel efficient than mine. What the heck did you do?
I cleaned throttle body and the iac and now it will work its way to 600 rpm after u let her warm up
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