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XJ Ask the Question Thread
Thread Starter
CF Veteran
Joined: Jun 2009
Posts: 5,383
Likes: 5
Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
Ok, I have a junkyard axle to put in the front and in the future I will be getting a winch and logan bumper. As of rt now I want to raise the front end with coil spacers when I put in the axle and have it all apart. I also want to get a drop pitman arm to help the geometry of the stock steering that I will be runing with junkyard axle. The RE pitman arm that I am looking at is 1" longer than stock. If I get two inch coil spacers would I need to get a 3" drop pitman arm? I would also like to limit articulation of the left front (droop?) To keep the front driveshaft from hiting the down pipe of the header. I have a 97' sport with a 4.5" RE superflex with 32' tires. Any ideas or thoughts would help thanks.
Thread Starter
CF Veteran
Joined: Jun 2009
Posts: 5,383
Likes: 5
Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
Hey guys .... I have a 4L 2001 and I am going to put on it:
(1) Lunati camshaft:
Advertised Duration (Int/Exh): 268/276
Duration @ .050 (Int/Exh): 226/234
Gross Valve Lift (Int/Exh): .527/.547
LSA/ICL: 110/106
Valve Lash (Int/Exh): Hyd/Hyd
RPM Range: 2000-6000
(2) Cylinder head and intake manifold ... porting + polishing + Competition valve jop.
(3) Ring and Pinion 4.56
(4) KandN + headers + exhaust system
(5) Two electric fan
.............. So, do I need MSD and what the differences that does it do and How much HP does it give?
Thanks and sorry about my english it is not that good
(1) Lunati camshaft:
Advertised Duration (Int/Exh): 268/276
Duration @ .050 (Int/Exh): 226/234
Gross Valve Lift (Int/Exh): .527/.547
LSA/ICL: 110/106
Valve Lash (Int/Exh): Hyd/Hyd
RPM Range: 2000-6000
(2) Cylinder head and intake manifold ... porting + polishing + Competition valve jop.
(3) Ring and Pinion 4.56
(4) KandN + headers + exhaust system
(5) Two electric fan
.............. So, do I need MSD and what the differences that does it do and How much HP does it give?
Thanks and sorry about my english it is not that good

Thread Starter
CF Veteran
Joined: Jun 2009
Posts: 5,383
Likes: 5
Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
Hi everyone.
I'm new here. I've a standard Cherokee XJ 2.5L 1994 model. Basically I decide to
buy a Flowmaster 40 series.
However there are option for me to choose in terms of inlet/outlet measurement diameter.
My question, what is the correct measurement inlet/outlet diameter for me to choose?.
I've looked in the internet but did not found the answer. Hope you guys could help me on this.
Many thanks,
Matt
p/s : sorry if I open thread in a wrong procedure
I'm new here. I've a standard Cherokee XJ 2.5L 1994 model. Basically I decide to
buy a Flowmaster 40 series.
However there are option for me to choose in terms of inlet/outlet measurement diameter.
My question, what is the correct measurement inlet/outlet diameter for me to choose?.
I've looked in the internet but did not found the answer. Hope you guys could help me on this.
Many thanks,
Matt
p/s : sorry if I open thread in a wrong procedure
Thread Starter
CF Veteran
Joined: Jun 2009
Posts: 5,383
Likes: 5
Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
Here are the codes...eep changed all the O2 sensors, 160k on the jeep anyway and I don't know when they were last changed.
Oh yeah the codes:
Here are the codes:
P0135-oxy sensor heater - bank 1 - Sensor 1
P0141 - oxy sensor heater - Circuit bank 1 - sensor 2
P0155 - oxy sensor heater - Circuit bank 2- sensor 1
P0161 - oxy sensor heater - Circuit bank 2 - Sensor 2
P0158 - oxy sensor - Circuit high voltage - bank 2 - sensor 2
Like I said I changed all four O2 sensors.
Oh yeah the codes:
Here are the codes:
P0135-oxy sensor heater - bank 1 - Sensor 1
P0141 - oxy sensor heater - Circuit bank 1 - sensor 2
P0155 - oxy sensor heater - Circuit bank 2- sensor 1
P0161 - oxy sensor heater - Circuit bank 2 - Sensor 2
P0158 - oxy sensor - Circuit high voltage - bank 2 - sensor 2
Like I said I changed all four O2 sensors.
Thread Starter
CF Veteran
Joined: Jun 2009
Posts: 5,383
Likes: 5
Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
I have a 2000 cherokee and just realized that the PO sold me a jeep with only 2 bolts holding the steering box on. The third one is broke in the mounting hole of the box. Do I take the box off to get the bolt out or will that give me more problems? I plan on instaling a new spacer for the steering box while I'm at it.

Member
Joined: Jun 2010
Posts: 111
Likes: 1
From: Walnut Creek, CA
Year: 1991
Model: Cherokee
Engine: 4.0 liter
Thanks, I pulled the oil pan to clean out the sludge and in the process changed the flange gasket at the exhaust manifold. Now there's only the ticking at idle but it goes away when the pressure builds up.
Senior Member
Joined: Apr 2009
Posts: 954
Likes: 2
From: New Waverly, Tx
Year: 1997
Model: Cherokee
Engine: Used engine just put in less than 79kmiles onit jeepersCreepers 60mm TB, '99-'01 intake, BorlaHeader
Junior Member
Joined: Jun 2010
Posts: 63
Likes: 0
From: Fairport Harbor, Ohio
Year: 1999
Model: Cherokee
Engine: 4.0L 242 CI 6Cyl
Got a quick question. I found someone selling an ARB air locker. Does anyone know if you have to have a specific locker for your gear ratio, or will one locker work with the factory carrier, and a different one for the bigger carrier? I have the factory 3:55 and want to go to 4:10's eventually. I don't want to buy this locker now and then have to buy another one later. Any help would be appreciated. Thank you.
Thread Starter
CF Veteran
Joined: Jun 2009
Posts: 5,383
Likes: 5
Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
Got a quick question. I found someone selling an ARB air locker. Does anyone know if you have to have a specific locker for your gear ratio, or will one locker work with the factory carrier, and a different one for the bigger carrier? I have the factory 3:55 and want to go to 4:10's eventually. I don't want to buy this locker now and then have to buy another one later. Any help would be appreciated. Thank you.
http://www.arb.com.au/resources/pdf/...tion_chart.pdf
page four.
Member
Joined: Jul 2010
Posts: 263
Likes: 0
From: Williamsburg, Va.
Year: 1998
Model: Cherokee
Engine: 4.0 I6
My 98 XJ NEVER starts on the first try unless I just had it running. Doesnt matter how long I hold down the starter, but as soon as I cut it off and try again it usually fires right up. Sometimes it take a bit longer than others to start. Is this normal with the 4.0 I6?
Also, when I put my XJ in drive the drivetrain "clunks" everytime, is this my universal joint or could it be something else? I know its not the motor mount.
Also, when I put my XJ in drive the drivetrain "clunks" everytime, is this my universal joint or could it be something else? I know its not the motor mount.
Last edited by M4RK; Jul 14, 2010 at 07:22 PM.
CF Veteran
Joined: Jun 2010
Posts: 2,117
Likes: 3
From: Ohio
Year: 1998
Model: Cherokee
Engine: 4.0 stock
Check the connection to the CPS also if it becomes corroded or bad connection it could cause a no spark condition.
Most likely a U joint.
CF Veteran
Joined: Jun 2010
Posts: 2,117
Likes: 3
From: Ohio
Year: 1998
Model: Cherokee
Engine: 4.0 stock
It could be valve train noise. A little noise is okay but if it is loud it would be a good idea to check the valve lash.
CF Veteran
Joined: Jun 2010
Posts: 2,117
Likes: 3
From: Ohio
Year: 1998
Model: Cherokee
Engine: 4.0 stock
Hi everyone.
I'm new here. I've a standard Cherokee XJ 2.5L 1994 model. Basically I decide to
buy a Flowmaster 40 series.
However there are option for me to choose in terms of inlet/outlet measurement diameter.
My question, what is the correct measurement inlet/outlet diameter for me to choose?.
I've looked in the internet but did not found the answer. Hope you guys could help me on this.
Many thanks,
Matt
p/s : sorry if I open thread in a wrong procedure
I'm new here. I've a standard Cherokee XJ 2.5L 1994 model. Basically I decide to
buy a Flowmaster 40 series.
However there are option for me to choose in terms of inlet/outlet measurement diameter.
My question, what is the correct measurement inlet/outlet diameter for me to choose?.
I've looked in the internet but did not found the answer. Hope you guys could help me on this.
Many thanks,
Matt
p/s : sorry if I open thread in a wrong procedure
Welcome welcome!
Most simple way to determine the size pipe you have is to measure it. Use a caliper or tape measure. I don't know much about the diesels but most XJ exhaust pipes are 2.25" diameter.




