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weird Idle

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M

mdallaire

Senior Member
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1987 XJSC V12
Last night I went for a good drive and was shifting from 1 to drive and drive to 1 up and down and when I was going to shut it down I noticed it was idling funny in park it was 900 to 1500 rpm but with my foot on the brake it was a constant 1500 rpm sounds like a vacuum leak to me what do you think? I took it for another lap and
it runs good could it be the idle circut in the computer or the map senser?
confused.gif
 
Check to see if both throttle valves are seated against stop. check vacuum hose connections. I read somewhere that the charcoal canister can also cause this. It is inside the left front fender hehind the headlight. Check the three vacuum lines that are routed to it.

I hope that this helps.
 
do the brakes still feel like you have power assist? could be a problem with the booster.
 
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