in need of high idle help
02-26-2023, 01:21 AM
#1
Newbie
Thread Starter
Join Date: Nov 2022
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
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
02-26-2023, 06:06 AM
#2
CF Veteran
Join Date: Jun 2017
Location: Hangover, PA
Posts: 2,215
Likes: 0
Received 624 Likes
on
466 Posts
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.
02-26-2023, 06:16 AM
#3
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,932
Received 1,534 Likes
on
1,244 Posts
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?
02-26-2023, 08:45 AM
#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.
02-26-2023, 08:48 AM
#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.
02-26-2023, 10:58 PM
#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.
The following users liked this post:
cruiser54 (02-27-2023)
Thread
Thread Starter
Forum
Replies
Last Post
gungui
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
0
10-26-2016 03:14 PM
zoom63
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
2
06-27-2014 05:38 PM
myers55
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
4
04-27-2012 03:18 PM
Passt
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
0
12-06-2011 05:12 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)