just got an 88 4.0 andf need to know what
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
OK. If you have an 88, clean the C-101 and refresh the grounds. There's a "section" Lol! Sure, I'd be glad to offer feedback. Er..uh..Ok. I check my CPS before coffee some days....I'll do something in the AM, and you will hear from me. 
Oh, and sort of "overlapped" with Radi (since I'm really slow). Agreeing with the cooling system. It seems there could be a sticker, or more info, obvious. IT'S AN EXPANSION BOTTLE! Gotta be at least 1/2 air in there for something to compress. (or something, somewhere else is gonna give)(like the bottle). The Renix closed system, has no pressure relief valve. Important to have a fan shroud and functioning aux fan, as well. (comes on a bit below 220, or on defrost or when the AC is working)

Oh, and sort of "overlapped" with Radi (since I'm really slow). Agreeing with the cooling system. It seems there could be a sticker, or more info, obvious. IT'S AN EXPANSION BOTTLE! Gotta be at least 1/2 air in there for something to compress. (or something, somewhere else is gonna give)(like the bottle). The Renix closed system, has no pressure relief valve. Important to have a fan shroud and functioning aux fan, as well. (comes on a bit below 220, or on defrost or when the AC is working)
Last edited by DFlintstone; Jul 12, 2012 at 05:41 PM.
Senior Member
Joined: Aug 2011
Posts: 604
Likes: 1
From: California
Year: 1990
Model: Cherokee
Engine: 4.0 i6
Soooo if I'm going to upgrade my injectors I'm going to want an injector that flows pretty much the same as stock because I will run rich other wise.. Alright makes good enough sense! Next step is to find some moneyy to buy some...
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
I'm in the same boat, busy and broke. I have 8 703's here, as well as the ones I took out, (which the PO paid $80 each for, years ago).
I wonder what Gee oh Dee paid for his Ford type....
Btw, I noticed there are 6 hole out there now....
I wonder what Gee oh Dee paid for his Ford type....
Btw, I noticed there are 6 hole out there now....
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Yes. Contact programbo on this forum for injectors.
Lazy and cheap. Thats me!
Funny thing...I can work/fix/diagnose other folks ride like none other...but my own crap? Nah, it can wait...
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
The shoemaker's kids go barefoot and the carpenter's roof leaks.
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
And the "jack of all trades" ? How about Polyurethane window calking on the leaky boot, and a solar water heater collector over the roof leak.....
Revised 04-18-2012
* means instructions have been written.
3-C101 Connector Refreshing*
2- Checking sensor grounds*
1-Ground refreshing, adding engine bay grounds
9-CPS testing and adjusting*
6- Snugging up intake manifold bolts
7-Throttle body and IAC cleaning
13-O2 sensor diagnostics
?~21-Vacuum Test For Exhaust Restriction*
?~4-Connector and relay /receptacle refreshing*
?~5-Coil/ICM contacts*
?~8-TPS testing and adjusting*
“?~”--maybe roughly in order, easy to longer...
Revised 04-18-2012
* means instructions have been written.
3-C101 Connector Refreshing*
2- Checking sensor grounds*
1-Ground refreshing, adding engine bay grounds
9-CPS testing and adjusting*
6- Snugging up intake manifold bolts
7-Throttle body and IAC cleaning
13-O2 sensor diagnostics
?~21-Vacuum Test For Exhaust Restriction*
?~4-Connector and relay /receptacle refreshing*
?~5-Coil/ICM contacts*
?~8-TPS testing and adjusting*
“?~”--maybe roughly in order, easy to longer...
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
And the "jack of all trades" ? How about Polyurethane window calking on the leaky boot, and a solar water heater collector over the roof leak.....
Revised 04-18-2012
* means instructions have been written.
3-C101 Connector Refreshing*
2- Checking sensor grounds*
1-Ground refreshing, adding engine bay grounds
9-CPS testing and adjusting*
6- Snugging up intake manifold bolts
7-Throttle body and IAC cleaning
13-O2 sensor diagnostics
?~21-Vacuum Test For Exhaust Restriction*
?~4-Connector and relay /receptacle refreshing*
?~5-Coil/ICM contacts*
?~8-TPS testing and adjusting*
“?~”--maybe roughly in order, easy to longer...
Revised 04-18-2012
* means instructions have been written.
3-C101 Connector Refreshing*
2- Checking sensor grounds*
1-Ground refreshing, adding engine bay grounds
9-CPS testing and adjusting*
6- Snugging up intake manifold bolts
7-Throttle body and IAC cleaning
13-O2 sensor diagnostics
?~21-Vacuum Test For Exhaust Restriction*
?~4-Connector and relay /receptacle refreshing*
?~5-Coil/ICM contacts*
?~8-TPS testing and adjusting*
“?~”--maybe roughly in order, easy to longer...
CF Veteran
Joined: Jan 2012
Posts: 1,057
Likes: 2
From: Nazareth/Pen Argyl, Pennsylvania
Year: 1989
Model: Cherokee
Engine: 4.0L 242ci I6
Renix on the 4.0 from 87-90, on the 2.5 in 86 but not too sure on that. I only follow the 4.0 really. Renix is a name for the joining of Renault and Bendix, the companies who designed the fuel injection/management system. A quick google search will give you a good amount of info. You were close on the years Gee oh Dee :P
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Renix on the 4.0 from 87-90, on the 2.5 in 86 but not too sure on that. I only follow the 4.0 really. Renix is a name for the joining of Renault and Bendix, the companies who designed the fuel injection/management system. A quick google search will give you a good amount of info. You were close on the years Gee oh Dee :P
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
bradszr1 Please don't mind us stomping around in your thread! Gee oh Dee works here, Cruiser is an expert, and I...well, I just keep showing up.
That IS the order I might consider. (of course 89&90 won't be doing their C-101). That's from your list. I might see if there is air in the tires, and oil and water in it first!
IF there were a problem, by all means, clean up the grounds a.s.a.p. Otherwise you may well just end up chasing your tail!
(over 10 years, 3 relay connections (& the ballast resistor) have had connection problems, fuel, aux fan, & the AC clutch)(two of three were not "critical")
That IS the order I might consider. (of course 89&90 won't be doing their C-101). That's from your list. I might see if there is air in the tires, and oil and water in it first!
IF there were a problem, by all means, clean up the grounds a.s.a.p. Otherwise you may well just end up chasing your tail!
(over 10 years, 3 relay connections (& the ballast resistor) have had connection problems, fuel, aux fan, & the AC clutch)(two of three were not "critical")
Thread Starter
Newbie
Joined: Jul 2012
Posts: 19
Likes: 0
From: lone pine ca
Year: 88 cherokee
Model: Cherokee
Engine: 4.0
please stomp o n the new rookie all you want
. plenty of good info and kinda nice to get to know some of ya. .; i have just about got everything back together . have to make some new plastic vacuum lines . having owned 2 zr1 corvettes for over 10 years i have gotten really good at making them from scratch. i set up a deal with fic injectors for the zr1s and will see if i can get a deal for us over here . i will try to get back to you all on thurs with what i find out .thanx so much for sharing what you guys have so far .seems like it might be a fun place to hang from time to time .
. plenty of good info and kinda nice to get to know some of ya. .; i have just about got everything back together . have to make some new plastic vacuum lines . having owned 2 zr1 corvettes for over 10 years i have gotten really good at making them from scratch. i set up a deal with fic injectors for the zr1s and will see if i can get a deal for us over here . i will try to get back to you all on thurs with what i find out .thanx so much for sharing what you guys have so far .seems like it might be a fun place to hang from time to time .
CF Veteran
Joined: Jan 2012
Posts: 1,057
Likes: 2
From: Nazareth/Pen Argyl, Pennsylvania
Year: 1989
Model: Cherokee
Engine: 4.0L 242ci I6
I might stomp on a thread from time to time too. I have a habit of being the know-it-all sounding rookie. I just have nothing better to do other than sit on my computer and post on this forum all day. And, well, I'm jeep crazy
If you ever have any type of question about a renix, cruiser is the guy. I swear, if I ever met him in person I would just bow down in awe. Cruiser, how are you not a moderator yet?
CF Veteran
Joined: May 2011
Posts: 6,098
Likes: 250
From: DE
Year: 1988
Model: Cherokee
Engine: I6 4.0
I've had an 88 for the past two years and runs amazingly, the only issue I ever get is a random high idle start up from time to time. My dad has replaced all the sensors that could be the culprit and it still does it. So I just have to slap some wires when it happens and it all goes back to normal. Basically these things are amazing, just check all the grounds and the usual maintenance


