Extremely High Idle
#1
Extremely High Idle
I have a 95 XJS that has a Extremely High Idle , when I first start it up when it's cold it goes to aprox 1300 rpm, then after warmed up I can drive off normally and it fine til I shutoff the engine. When I restart the engine, no matter how long after I just shut it off, it will jump to aprox 1500 - 2000 rpm and will not come down. I have cleaned the throttle body, MAF and air cleaner and changed out the Idle Air Control Valve., to no avail, would appreciate any help. I also ran a diagnostics check and NOT getting any trouble codes. Desperate in Missouri...
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#3
Welcome to the forum usaf,
I've moved your question from General Tech Help to XJS forum. This is the place to post technical questions about your model.
Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.
Graham
I've moved your question from General Tech Help to XJS forum. This is the place to post technical questions about your model.
Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.
Graham
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#8
high idle
The main thing I cannot understand about it is, when the engine is cold it starts right up and runs fine until you shutoff the engine and restart it, then it's high idle until its cold again..Ive replaced the IACV. Im not going to replace the TPS until I have too almost 500.00 and there may not be anything wrong with it. I've cleaned the throttle body, cleaned the MAF sensor and air cleaner. There is not a Jaguar dealership within more then 200 miles of this place, so thats out. I bought that a normal repair shop would have software to reset the idle or ecm on this car. Thanks for your response. I don't have a repair manual or owners manual on it either.
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#13
CTS is coolant temperature sender.
Download the Kirby Palm book as it has several tons of useful information:
http://www.jag-lovers.org/xj-s/book/XJS_help.pdf
The six cylinder units are prone to sticking throttle butterflies as they get gummed up; take the air cleaner off and clean it if it is all gunky.
Download the Kirby Palm book as it has several tons of useful information:
http://www.jag-lovers.org/xj-s/book/XJS_help.pdf
The six cylinder units are prone to sticking throttle butterflies as they get gummed up; take the air cleaner off and clean it if it is all gunky.
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#19
700-750 sounds like the right idle out of gear...550 sounds right in gear.
If this is an intermittent problem, I could be wrong about the base idle reset.
Idle is performed by the coolant sensor, MAF and oxygen sensors. When the car starts, it takes a few minutes for the exhaust to heat up enough for the oxygen sensors do anything. Do you get better idle on a cold start?
You can jump the two contacts on the coolant temp sensor telling the computer that the engine is hot enough, although it's a $20 part that is simple to replace.
The MAF diagnosis is a bit tougher...
If this is an intermittent problem, I could be wrong about the base idle reset.
Idle is performed by the coolant sensor, MAF and oxygen sensors. When the car starts, it takes a few minutes for the exhaust to heat up enough for the oxygen sensors do anything. Do you get better idle on a cold start?
You can jump the two contacts on the coolant temp sensor telling the computer that the engine is hot enough, although it's a $20 part that is simple to replace.
The MAF diagnosis is a bit tougher...
#20
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