fuel compression
01-13-2009, 10:42 PM
#1
Member
Thread Starter
Join Date: Dec 2008
Location: Pleasant Grove, UT
Posts: 175
Likes: 0
Received 0 Likes
on
0 Posts
fuel compression
Ok so i was having some problems with my 89 cherokee... it would stall when it's under 2000rpm's and sometimes even turn off. I replaced fuel filter and used the injector cleaner about 3 times. I did a compression test and it sits at 32psi but when i turn the jeep off, psi goes straight to 0. i tried it on my friends 96 xj and it held it at 35 psi for a very long time. do i have a leak or do all 89's do this?
01-13-2009, 11:47 PM
#2
CF Veteran
Join Date: Nov 2008
Location: Oak Harbor, WA.
Posts: 6,989
Likes: 0
Received 4 Likes
on
4 Posts
Year: 1987
Model: Cherokee
Engine: 4.0 liter RENIX I-6, DIY Cold Air Intake, 2.5 FM Exhaust, 3 Core Radiator
There is a one way check valve built into your fuel pump that should keep that pressure after the motor is turned off. That won't cause your stalling though. It will just make it so it takes longer for your XJ to start because the fuel is being pumped clear from the tank to the motor everytime you crank her up.
01-13-2009, 11:48 PM
#3
CF Veteran
Join Date: Nov 2008
Location: Oak Harbor, WA.
Posts: 6,989
Likes: 0
Received 4 Likes
on
4 Posts
Year: 1987
Model: Cherokee
Engine: 4.0 liter RENIX I-6, DIY Cold Air Intake, 2.5 FM Exhaust, 3 Core Radiator
I will tell you this. When that check valve went bad in my XJ, I shortly there after replaced the fuel pump and all was well.
Thread
Thread Starter
Forum
Replies
Last Post
Ye Ol' Cherokee
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
19
05-07-2019 06:15 AM
carverdave
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
7
02-06-2019 08:55 AM
Ye Ol' Cherokee
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
8
10-09-2015 10:29 PM
Azzy
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
0
09-08-2015 10:49 PM
Chick-N-Picker
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
2
09-07-2015 07:56 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)