Sep 21, 2015, 03:49 PM
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XJ Ask the Question Thread
CF Veteran
Joined: Dec 2010
Posts: 1,240
Likes: 0
From: Rocket Country MI
Year: 1999
Model: Cherokee
Engine: 4.0
I come to my XJ family with a question about my girls KJ. I flushed the heater core and splashed a little water on the connectors for coil/injectors I'm not really sure which. Anyway i have great heat, but crappy idle and cel is on and flashing at me, im guessing cyl 6 miss fire but how would i fix it?
CF Veteran
Joined: Apr 2011
Posts: 14,553
Likes: 1
From: Carrollton, GA
Year: 1994
Model: Cherokee
Engine: Inline 6 4.0L High Output
How accurate is this "write up"? http://troubleshootmyvehicle.com/jee...-compression-2
Do i need to remove all 6 plugs to do the test on one cyl? It shouldnt matter though...
For the wet test just add the oil in where i pull the plug out?
Do i need to remove all 6 plugs to do the test on one cyl? It shouldnt matter though...
For the wet test just add the oil in where i pull the plug out?
Pssssttttt
Seasoned Member
Joined: Aug 2013
Posts: 251
Likes: 0
From: Burien, wa
Year: 88
Model: Cherokee
Engine: 4.o
If I was to get a RE 1600 track bar and then get their RE 1665 bracket I should be able to drill out the bracket to 3/4 and run it. But my concern is longevity. This is a DD then will see light wheelin a handful of times a year. I just need something safe and reasonably priced.
Last edited by Mullet Bullet; Feb 9, 2014 at 11:09 AM.
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Too lazy to click links on my phone.
Block throttle wide open
Take compression reading on 3rd stroke if you're conparing to stock specs, if you're just comparing between cylinders doesn't matter if you keep cranking
I'd remove all spark plugs just to reduce wear on your starter and battery
Yes a wet test is done by pouring a spoonful of oil into the spark plug hole, this helps seal the rings
Block throttle wide open
Take compression reading on 3rd stroke if you're conparing to stock specs, if you're just comparing between cylinders doesn't matter if you keep cranking
I'd remove all spark plugs just to reduce wear on your starter and battery
Yes a wet test is done by pouring a spoonful of oil into the spark plug hole, this helps seal the rings
Last edited by salad; Feb 9, 2014 at 12:01 PM. Reason: i has a derp
CF Veteran
Joined: Apr 2011
Posts: 14,553
Likes: 1
From: Carrollton, GA
Year: 1994
Model: Cherokee
Engine: Inline 6 4.0L High Output
Too lazy to click links on my phone.
Block throttle wide open
Take compression reading on 5th stroke if you're conparing to stock specs, if you're just comparing between cylinders doesn't matter if you keep cranking
I'd remove all spark plugs just to reduce wear on your starter and battery
Yes a wet test is done by pouring a spoonful of oil into the spark plug hole, this helps seal the rings
Block throttle wide open
Take compression reading on 5th stroke if you're conparing to stock specs, if you're just comparing between cylinders doesn't matter if you keep cranking
I'd remove all spark plugs just to reduce wear on your starter and battery
Yes a wet test is done by pouring a spoonful of oil into the spark plug hole, this helps seal the rings
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Whoops, I derped. It's third stroke. Here's the FSM wording
Third stroke is relevant if you're comparing to the factory numbers of 120-150 PSI. If you're just comparing two cylinders you can crank away until the number starts going up, although that does just use up battery unnecessarily.
(1) Clean the spark plug recesses with compressed air.
(2) Remove the spark plugs.
(3) Secure the throttle in the wide-open position.
(4) Disable the fuel system. (Refer to Group 14, Fuel System for the correct procedure)
(5) Disconnect the ignition coil.
(6) Insert a compression pressure gauge and rotate the engine with the engine starter motor for three revolutions.
(7) Record the compression pressure on the 3rd revolution. Continue the test for the remaining cylinders.
Refer to Engine Specifications for the correct engine compression pressures.
(2) Remove the spark plugs.
(3) Secure the throttle in the wide-open position.
(4) Disable the fuel system. (Refer to Group 14, Fuel System for the correct procedure)
(5) Disconnect the ignition coil.
(6) Insert a compression pressure gauge and rotate the engine with the engine starter motor for three revolutions.
(7) Record the compression pressure on the 3rd revolution. Continue the test for the remaining cylinders.
Refer to Engine Specifications for the correct engine compression pressures.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Newbie
Joined: May 2013
Posts: 6
Likes: 0
From: North Carolina
Year: 1993
Model: Cherokee
Engine: 4.0L I6
I know that you can replace a 93 cherokees brake booster and master cylinder with a 96 cherokee but is it possible to just switch out the master cylinder and keep in the 93 brake booster?