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Old August 14th, 2011, 05:27 PM   #1
cobra96svt570
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Help me renix pro's! 87' starts-stalls.& no start.

Ok, I have a 87 renix xj auto 242. Got it cheap, wouldnt run. Wiggled and changed the fuel pump relay and it ran. Parked it for a week, went to start, and nothing. But It was getting fuel.
A week later, changed the cap and rotor, and it ran, but it ran crapy. The next day it wouldnt start again.

I put a gauge on the fuel rail port, jumper'd the fuel pump with the diagnostic terminals,5&6. It showed almost 40 psi, a lil hi because I jumper passed the resistor, and the was no vaccum to the regulator since it wasnt running.

Im gettin Ohms on the CPS, and im pretty sure if it was bad it would run at all.
My alternator is shot, the bearing went out and it not puttin out any juice, theres a plug tht goes to it, whats this for? the gauge and a sending wire to the ecu? would this cause it to start then imediatly stall within 1-2 second?

Like I said, It fires over and within 1-2 seconds stalls, and repaeats. Till ventually it wont fire at all.. Then I have to disconect the batter terminals and conect them to clear the pcm.
I messed around with the IAC idle steppr, and tps, and didnt seem to make a diff. will it still run with a bad Idle stepper and or TPS?
I heard that the there could be a problem with my egr, but would that keep it from running?,
I also heard that thre could be a problem wit the ignition swith itself or the linkag in the column.
OhhYEA, I noticed it will crank over in any gear, its and auto, but inkw it should have a N-saftey switch, could this be something else to consider?

Its getting spark, change cap and rotor.
How can I test the TPS, And IAC Stepper motor?
Someone said something about the latch relay also, any input on what or why that would casue the problem. I hear the relays clicking for the latch.
You think It could be the cam sensor in the distributor?

I also found a box relay, that is fed from the battery about 6" away, has a post with fuseable links, they all checked out good. How about the relay box itself would that cause this run then stall issue?

Its driving me nuts!, I just had it running, a day befor this happened.
Please, any input would help guys, I gotta start driving to work, Im tired of riding with this dirty old hippy.

Any suggestions would be great,
if i cant figure it out soon, its gonna get a 30-06 M1 garand paint job
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Old August 14th, 2011, 06:17 PM   #2
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old renix stuff was common to have problems where the main electrical/ecm plug goes through the firewall. it bolts the the other end of the plug on the other side of the firewall. they kinda sandwich through the firewall. its a common corrsion probolem on older renix electronics. just a random idea. unbolt it, unplug it and clean it well.
good luck
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Old August 14th, 2011, 06:45 PM   #3
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X2 what joe jeep said, start there. engine will still run with tps and iac unplugged, just run like shit, so I would keep it simple man... check air, fuel and spark. if had issues with fuel before I would double check that first after clean wire problem areas.
Also sure you put the wires on correctly?
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Old August 16th, 2011, 01:45 PM   #4
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Quote:
Originally Posted by MiNi Beast View Post
X2 what joe jeep said, start there. engine will still run with tps and iac unplugged, just run like shit, so I would keep it simple man... check air, fuel and spark. if had issues with fuel before I would double check that first after clean wire problem areas.
Also sure you put the wires on correctly?
thanksguys, I did the fire wall connection clean and added some di-electric grease. And yes, all the wires are correct, because when it does run, it runs smooth, plus I tripple checked the diagram.
Im gonna try wiring the CKP-CPS sensor on the bellhousing directly to the pins on the ecu. There was a service bulletin recall for the wire&plugs that are on the engine and the firewall connection.

As for the IAC stepper motor, I pulled it out and had someone cranked it, it fired over and i could keep it running sometimes by putting my finger in and out of the hole lol, so Im gonna get a junkyard one just to try.

Ive been hearing problems with the ignition switch cylinder lock, and engaging rod that rouns in the column, Im gonna tear it apart and analyze it, Maybe throw a quick pushbutton and toggle switch seetup just to see if it make a diff.
Ive also heard that it could be the ECU? I heard that they only have a 8-10 year life. But you have to get the exact numbers matching, or it wont run at all. Ive found a thread on other forums with the guy having same exact problems, he changed his CPS and it solved it for a lil while, then got another ECU and it solved it completly.So Ill have to get some cash and look for and ecu and grab a cps.

If all else fails, Its got almost 200k on it,prob a a lil blow bye and dosent have near the balls as my 96 did. And since I have a 96' I rolled on a trail with the better webbed block and H.O setup, I think a swap mite be coming soon.
I got some turbo stuff laying around off my Cobra,so I think Ill swap the 96' in and throw a hombrew turbo kit on it. The 96' engine with the obd2 H.o is a lil bit easier to tune and install a piggyback with. But then again, I eally like the renix EFI design and setup simplicity, but it sucks theres no OBD.(not unless you buy the special snap on-dealer stuf). and theres lots of gremlins I noticed with these renix 4.0s.

Ill try a cpl thing and post what happens. Thanks guys.
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Old August 16th, 2011, 01:59 PM   #5
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Ill go over a quick update again, simplified.

Like i said, Fuel PSI sytem is 39psi, and holds pressure. Pump turns on and works properly. Bypassed resistor, and even put the pump on a direcct acc. fuse box feed. Coil and dizzy are firing. Injectors are working.

All fuseable links are good. I noticed that after it runs and stalls a cpl times, ait then goes into like a shutdown mode and injectors or spark dont fire. I reset the ecu by holding the ground and pos cables together and it, repeats the process of starting then stalling. I cant figure it, the day i changed the dizzy cap and rotor, put some gas in it it ran fine.
The next day, it would start, stall, and then go to nothing.Then Id reset the ecu holding the battery cables together and Id atleast get it to fire and stall.again.

I want to bring up the fact that Im running off the battery, The alternator took a dump. And I was wondering if that would cause any issue? does anybody know what the plug that goes to the alternator feeds? does it feed voltage to the gauge?ECU? anybody know what those 2 wires on that plug do? I cant figure it out on the wiring diagram.
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Old August 16th, 2011, 02:03 PM   #6
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Quote:
Originally Posted by joe_jeep View Post
old renix stuff was common to have problems where the main electrical/ecm plug goes through the firewall. it bolts the the other end of the plug on the other side of the firewall. they kinda sandwich through the firewall. its a common corrsion probolem on older renix electronics. just a random idea. unbolt it, unplug it and clean it well.
good luck
Yea, Thats what i heard also. I did unbolt the firewall connection, cleaned it with brake cleaner, blew it out with air compressor, brush the terminals, and re-assembled it. It mite take a while but Im gonna do and om test on the wires feeding the connector, and to the other side wires feeding the ecu one by one.
Does anyone know a way to check the CPS? With a meter? I forget how to do it, how to check if its good-bad or ugly. And how would I check the plug coming from the ecu to the cps.?
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Old August 16th, 2011, 02:33 PM   #7
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I found a site how to check sensors, I had it in my favorties and musta found it a while back. Here it is, Im sure you heard-seen it-http://www.lunghd.com/Tech_Articles/Engine/Basic_Sensors_Diagnostics.htm
www.lunghd.com
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Old August 16th, 2011, 04:32 PM   #8
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can find alot of info on the renixs over on www.comancheclub.com/forums . but yeah your problem maybe the fact that your charging system is not working. prehaps try installing a alt and see if that helps the stalling, just a thought.
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Old August 16th, 2011, 04:39 PM   #9
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Sometimes the CPS fails intermittently. IE works cold but starts to fail the warmer it gets. Just a thought.
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Old August 16th, 2011, 08:36 PM   #10
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Quote:
Originally Posted by MiNi Beast View Post
can find alot of info on the renixs over on www.comancheclub.com/forums . but yeah your problem maybe the fact that your charging system is not working. prehaps try installing a alt and see if that helps the stalling, just a thought.
yea, jeep minds think alike. lol .thats what Im thinking, I think that plug that goes to that alternator sends a signal to the ecu telling it to operate in normal function, and only let it operate when its putting out its normal voltage, not less like it would running off the battery.
Ill try it as soon as i get hands on one.
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Old August 16th, 2011, 08:38 PM   #11
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Sometimes the CPS fails intermittently. IE works cold but starts to fail the warmer it gets. Just a thought.
Thanks for that info, that would seem about rite. Ive heard that before but never considerd. Im gonna grab a CPS, and a new alternator, and try one at a time to seee which one solves the problem, if it is the problem, but i tihnk it is.
Thanks for the help guys.
Cheers,
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Old August 16th, 2011, 08:45 PM   #12
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hey, any you guys know were I could post some actory service manual stuf"? I have 116 files o info on 84-91 xj's everything rom vaccum, fusses to trans and diagrams, you name it i got it on a pd file.
If you guys need any info on any thing 84-91 letme know.
I asked and admin, in the pub were and i i could post these files and havent got and answer.
Were would i post these iles? and how do you transfer pdf adobe type files to a thread? If not Ill just post them in regualar word document type, you just wont get the diagrams and pics, but youll get alot of usefull info.
any ideas? help?
Gimme yourr email i you want and idea of what there like. the disc i found in the glove box came with the jeep and says, Jeep cherokee service manual 84-91
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Old August 17th, 2011, 01:21 AM   #13
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Quote:
Originally Posted by cobra96svt570 View Post
hey, any you guys know were I could post some actory service manual stuf"? I have 116 files o info on 84-91 xj's everything rom vaccum, fusses to trans and diagrams, you name it i got it on a pd file.
If you guys need any info on any thing 84-91 letme know.
I asked and admin, in the pub were and i i could post these files and havent got and answer.
Were would i post these iles? and how do you transfer pdf adobe type files to a thread? If not Ill just post them in regualar word document type, you just wont get the diagrams and pics, but youll get alot of usefull info.
any ideas? help?
Gimme yourr email i you want and idea of what there like. the disc i found in the glove box came with the jeep and says, Jeep cherokee service manual 84-91
well due to copyright infringements you are not to post manuals up on the forums, so I HAVE HEARD, but yeah if anyone was needed that info you can email and use file-share to transfer the info in a zip file. thanks for sharing man.
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Old May 14th, 2013, 01:48 AM   #14
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ok,
well thanks guys for you input. after listening to everyone but myself, and spending 2 years of time on-off and money, all along it was the ecu. Sure a lot of diagnostics on my part with the volt meter, checking sensors, reading the FSM, I finally narrowed it down to the ignition switch on top of the column, after checking that, all that was left was the ECU.

BTW, THE ECU SUPPOSIVLEY ONLY HAS A 15 year lifespan, and some last longer then others I guess depending on conditions or something like that I have read and heard.

So I found and ecu with all the same numbers on ebay, just make sure all the numbers at bottom of ecu match if you buy a used.. And for $60.00 SHIPED, I pluged it in and ran like a champ!!!
I got prices of 100$-180 for a new one from autozone-advance-online stores, just make sure whatever way you go you get the numbers correct.

I figured out it was the ECU, because it was the only thing that would cause the spark and injectors to stop firing after about 5 seconds of key on time of each key cycle.
So if you just have no spark, or no fuel, do your research and youll prob get lucky and it mite just be a fuel pump or CPS. Sites like LUNGHD.COM, and thus forum as well as others have great info.. Just google 87-88-89 jeep 4.0 wont start, start stall, etc.
so hopefully this helps anyone that may come to this in future..
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Old May 17th, 2013, 11:32 AM   #15
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Thanks for the update. Good to hear its running good again.
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