Sep 21, 2015, 03:49 PM
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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
For anyone that has done an 8.8 swap, could you throw up a list of parts that I will need? Also I don't know if we will have to modify my brake system (proportioning valve, master cylinder etc. ) My original plumbing comes from D35 w/ ABS, later swapped in an 8.25. All ABS plumbing is still there but inoperable of course. The new axle has disk brakes & already geared to my ratio. Spiders welded & will remain so for a little while.
Thx
Thx
https://www.cherokeeforum.com/f30/fo...wap-info-3847/
With a parts list but for YJ:
http://www.jedi.com/obiwan/jeep/ford88.html
8.8 XJ swap:
http://www.jeepforum.com/forum/f11/8...ite-up-530202/
CF Veteran
Joined: Oct 2009
Posts: 1,155
Likes: 0
From: Virginia Beach, VA
Year: 1991
Model: Cherokee
Engine: 4.0L H.O.
Thread Starter
CF Veteran
Joined: Jun 2009
Posts: 5,383
Likes: 5
Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
No. The pindle stays where it was before unplugging it. That means it will idle like before. Answer a question: did you eventually remove the throttle plate from the throttle?
CF Veteran
Joined: Oct 2009
Posts: 1,155
Likes: 0
From: Virginia Beach, VA
Year: 1991
Model: Cherokee
Engine: 4.0L H.O.
'I might sound really stupid but throttle plate??? Dude Stefano how have you been its been a while. I am going a little crazy with this thing it wont calm down lol... Its like its on crack!'
Thread Starter
CF Veteran
Joined: Jun 2009
Posts: 5,383
Likes: 5
Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
CF Veteran
Joined: Oct 2009
Posts: 1,155
Likes: 0
From: Virginia Beach, VA
Year: 1991
Model: Cherokee
Engine: 4.0L H.O.
Oh yeah put in new throttle body cleaned and fully took apart everything! changed 4 tps's 1 IAC But from Jy not from Auto store lol Have a couple more IACs i can try...
Yeah no worries i obviously was gone for a while life has been crazy!
☠ CF Sheriff ☠
Joined: Nov 2009
Posts: 15,197
Likes: 18
From: Aberdeen, MD
Year: 1995
Model: Cherokee
Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts
my fuel pump runs continuously. its a renix 4 banger
went thru the whole test procedure as outline in the FSM/renix manual. i'm getting more than 1 volt,at the ecu, so the next step says if the fuel pump runs continuously to check the relay and associated wire harness.
but from my understanding, the relay is bypassed during startup, as is the ballast resistor. correct? ive been looking around and searching and finding conflicting thoughts about this.
i removed the relay completely and it still started up fine and ran continuously. so what else could be causing the permanent ground to the computer? maybe the wires at the pump itself are mixed up?
i didn't bother testing the ballast resistor cuz everything said it gets bypassed, and i'm not too sure where it is anyways.
went thru the whole test procedure as outline in the FSM/renix manual. i'm getting more than 1 volt,at the ecu, so the next step says if the fuel pump runs continuously to check the relay and associated wire harness.
but from my understanding, the relay is bypassed during startup, as is the ballast resistor. correct? ive been looking around and searching and finding conflicting thoughts about this.
i removed the relay completely and it still started up fine and ran continuously. so what else could be causing the permanent ground to the computer? maybe the wires at the pump itself are mixed up?
i didn't bother testing the ballast resistor cuz everything said it gets bypassed, and i'm not too sure where it is anyways.
When the pump keeps running it is usually because it is not able to make the pressure get high enough - so keeps running to try harder.
Blockage in pump / tank / filter might be worth looking at - as might be checking the ouput from the pump. Other thing to check is the regulator mounted on the fuel rail/TB. If the regulator has a damaged diaphragm then the pump will never reach pressure unless the regulator is replaced (or temorarily de-glitches itself).
The ballast resistor IS bypassed during cranking, and since it seems to be running fine once started i don't think the issue lies there.
The relay is in play here also - if it is stuck open it would cause the pump to run continuously.
First thing i would do is run a fuel pressure test. If it's a TBI, fuel pressure should be at 14.5psi at idle.
CF Veteran
Joined: Oct 2009
Posts: 1,155
Likes: 0
From: Virginia Beach, VA
Year: 1991
Model: Cherokee
Engine: 4.0L H.O.
Thread Starter
CF Veteran
Joined: Jun 2009
Posts: 5,383
Likes: 5
Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
CF Veteran
Joined: Oct 2009
Posts: 1,155
Likes: 0
From: Virginia Beach, VA
Year: 1991
Model: Cherokee
Engine: 4.0L H.O.
Thread Starter
CF Veteran
Joined: Jun 2009
Posts: 5,383
Likes: 5
Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
CF Veteran
Joined: Oct 2009
Posts: 1,155
Likes: 0
From: Virginia Beach, VA
Year: 1991
Model: Cherokee
Engine: 4.0L H.O.
Thread Starter
CF Veteran
Joined: Jun 2009
Posts: 5,383
Likes: 5
Year: 1988 limited
Model: Cherokee
Engine: 4.0 litre
Ok. what you have to do is this: loosen the two little screws that hold the plate and move it around so that it is as flush as possible with the bore walls, then holding the plate closed with a finger tighten the screws.
if that doesn't work and you have installed everything else correctly (vacuum lines, gaskets etc) i'll tell you what to do with the IAC.
if that doesn't work and you have installed everything else correctly (vacuum lines, gaskets etc) i'll tell you what to do with the IAC.
Last edited by fantic238; Feb 4, 2011 at 10:09 AM.