in need of high idle help
#1
in need of high idle help
I have a 2001 Cherokee 4.0 when I start it it instantly revs up to 2,000 rpm and stays there what could cause this it popped a code for a large vacuum leak but I cant find it
any help would be much apricated
any help would be much apricated
#2
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Year: 1998
Model: Cherokee(XJ)
Engine: 4.0L
The large vacuum leak is the source of the problem. The engine is taking in more air than it should be. That causes the engine to run out of control.
Find and fix the leak.
Find and fix the leak.
#3
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Has it had any recent work done to it? Manifold gasket? Vacuum line replacement?
Is your intake manifold missing any bolts? Are any bolts loose along the top of the intake manifold where it meets the head?
Is your intake manifold missing any bolts? Are any bolts loose along the top of the intake manifold where it meets the head?
#4
Senior Member
Your code "large vacuum leak". Was it actually "large EVAP leak" or a code for running lean?
In both cases you need to fix it to fix your problem but knowing which it is would make diagnostics easier for people.
In both cases you need to fix it to fix your problem but knowing which it is would make diagnostics easier for people.
#5
CF Veteran
If you remove the intake tube then cover the throttle body with your palm and the engine does not stall, you have a large vac leak. Doing this may also make the leak easier to locate.
#7
Senior Member
Yep. So IF the code and your high idle are related, which is not necessarily the case, you need to look for EVAP system leaks....... but even if they aren't related you still need to fix the evap system leaks.
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