NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > OEM Tech Discussion
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

OEM Tech Discussion Forum for OEM (Original Equipment) or stock XJs and MJs.

Reply
 
Thread Tools Display Modes
  #106  
Old February 24th, 2019, 19:07
4x4JeePmaNthINg's Avatar
4x4JeePmaNthINg 4x4JeePmaNthINg is offline
NAXJA Forum User
 
Join Date: Nov 2008
Location: Colorado
Posts: 1,245
Re: Engine swap vs shop

She running now, however I have two codes.

P0122 TPS circuit A low voltage
P0171 system too lean bank 1
Reply With Quote
  #107  
Old February 24th, 2019, 20:25
Heavyopp Heavyopp is offline
NAXJA Member
 
Join Date: Jan 2017
Location: Middlesex, NJ
Posts: 826
Re: Engine swap vs shop

What did you end up doing to get it running?
Reply With Quote
  #108  
Old February 25th, 2019, 00:53
4x4JeePmaNthINg's Avatar
4x4JeePmaNthINg 4x4JeePmaNthINg is offline
NAXJA Forum User
 
Join Date: Nov 2008
Location: Colorado
Posts: 1,245
Re: Engine swap vs shop

I'm uncertain, the distributor got indexed 3 times, I rechecked grounds, removed coil, tested, reinstalled and had spark. I'll be pulling it again tomorrow and re testing in warmer temps.
Reply With Quote
  #109  
Old February 25th, 2019, 07:03
CJR CJR is offline
NAXJA Forum User
 
Join Date: May 2005
Location: PA
Posts: 212
Re: Engine swap vs shop

Here's a trick to try in case the engine is not being properly grounded with the grounding cables/straps somewhere. Connect a jumper cable to the ground terminal (negative) of the battery and connect the other end directly to a starter mounting bolt, which is also the engine ground. See if that eliminates any Codes or improves the TPS voltages.

Best regards,

CJR
Reply With Quote
  #110  
Old February 25th, 2019, 13:29
4x4JeePmaNthINg's Avatar
4x4JeePmaNthINg 4x4JeePmaNthINg is offline
NAXJA Forum User
 
Join Date: Nov 2008
Location: Colorado
Posts: 1,245
Re: Engine swap vs shop

On 20v dc I'm getting .71v resting/idle, 3.90v at wide open throttle. It needs to be higher than .26 and lower than 4.49v so it seems good for sweep, volts increase/decrease smooth. The ground had .013 on run, also good. 5V read 5.18, I assume this is good?

I can try your idea CJR, but why would the ground have to do with the system running too lean? If it is ground related am I testing between wire and battery?

If it helps It didn't idle poorly until it was warmed up, should I suspect 02 sensor?

Last edited by 4x4JeePmaNthINg; February 25th, 2019 at 19:04.
Reply With Quote
  #111  
Old February 26th, 2019, 07:30
CJR CJR is offline
NAXJA Forum User
 
Join Date: May 2005
Location: PA
Posts: 212
Re: Engine swap vs shop

The computer needs precise voltage signals from its sensors to make correct decisions for running the engine properly. Degraded sensor voltages, caused by poor grounds, are interpreted by the computer as malfunctions supplied to it by its sensors. The computer has no way of knowing the engine has one or more bad grounds. The computer only receives the sensor voltages and then makes a decision to run the engine.

The trick I mentioned ignores all the grounding cable paths and grounds the engine directly to the battery. If the sensor voltages now become normal, you have a grounding cable/ground path problem somewhere. At that point, you keep refreshing the grounding straps or add more grounding straps until you see the sensor voltages improve to their spec'd values.

Best regards,
CJR
Reply With Quote
  #112  
Old February 26th, 2019, 12:56
4x4JeePmaNthINg's Avatar
4x4JeePmaNthINg 4x4JeePmaNthINg is offline
NAXJA Forum User
 
Join Date: Nov 2008
Location: Colorado
Posts: 1,245
Re: Engine swap vs shop

I tried the jumper cable grounding trick, starter bolt to the battery negative. She's still sputtering once warmed up.
(warmed up)
(at start up)
Refocused these issues to it's own thread.

Last edited by 4x4JeePmaNthINg; February 27th, 2019 at 02:22.
Reply With Quote
  #113  
Old March 11th, 2019, 02:26
4x4JeePmaNthINg's Avatar
4x4JeePmaNthINg 4x4JeePmaNthINg is offline
NAXJA Forum User
 
Join Date: Nov 2008
Location: Colorado
Posts: 1,245
Re: Engine swap vs shop

She breathes Rocky mountain air again. This has been no small task for the inexperienced me, none the less mostly alone labor wise. Though, I'm plenty glad I haven't taken this to a shop for the insane price of the work, 5,000-6000$ in Colorado for most places I called. An engine swap is costly, tideous, and time consuming either way you go about it, shop or not. Depending on what route one is to take, I did like the ability to have eyes on and study which parts I thought ide like to replace. A shop i dont think will quite do this in your favor because you will either coin out for a damn good replacement, or you will choose a more economical route, either way the shop will want as much$ as they can score, and they will want your vehicle out of the shop asap.

All said and done I've currently forked out under 2k for engine, header, plugs, fluids, paint, cap/rotor, gaskets, new hardware, upstream 02, likely a tps mopar for the remaining p0122 code. P1391 and new CEL pending scan, p1391 was listed as unconfirmed on bluedriver.

This has been good on the wallet comparatively, but in no way has this been a process to save time, at least for a newb like myself. The forums always say "try reading". I wish this was always the solution for those of us that are trying to dig through jeep issues. There are Many many threads on topics that pertain to all kinds of issues. In the few months I have been working through this swap and trouble shooting, ive learned and read that much of what is started on threads, never concludes nor adds a resolve for said issue.

To those pondering as to if you should attempt this project, I say go for it, so long as you have no time constraints. It's manageable alone, I removed the engine/ installed alone. It will take time and lots of up/down crawling under the jeep haha.

The installation portion of my project is now over, the engine is in, the jeep runs, and I have driven it.
The jeep ran fine before this project and everything worked perfectly fine. Upon install there have been many hurdles that kept arising and more continue to, even after using know good parts. This project has had no start issues, broken bolts in the block, distributor issues, poor running issues ( https://www.naxja.org/forum/showthread.php?t=1153110 ) and currently on another thread transmission issues ( https://www.naxja.org/forum/showthread.php?t=1153278 ) The hurdles continue, the project continues in a new portion of the drive train, and a p1391 code that the blue driver has not confirmed (driving has been smooth) though I did get a CEL tonight that I need to scan in the morning ( cps,ckps are 1yr old Mopar)
This thread isn't as clean and clear as I imagined from the start, but perhaps this is for the better, for those that may want to swap engines and can see that nothing is guaranteed, any issues can arise.

To those of you that have helped with giving your knowledge and advice, And your tolerance as I've been loosing my lid through this whirlwind, I Thank You Greatly! It is easy to forgot how some answers to small questions go a long way for some of us still learning about these vehicles, and that help is appreciated immensely.

After reading, reading, reading, asking?, reading, asking?,reading and hitting a dead end, some of you out there have time spent knowledge that reading just cant replace.

* I owe a Very humble special Thank You! to Hypoid for helping me to this point. You Sir are responsible for making this possible and my hats off to you.

Last edited by 4x4JeePmaNthINg; March 11th, 2019 at 03:02.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Engine Machine Shop Help mrbilly2783 SoCal Chapter 4 February 28th, 2014 09:28
Engine mods while she's in the shop? BlurpleXJ Modified Tech Discussion 3 June 3rd, 2013 11:14
engine swap: 96 4.0 auto engine where 92 4.0 manual tranny engine is cjben OEM Tech Discussion 4 January 21st, 2010 19:52
Need to find a engine shop in N.C maztheman South East Chapter 3 January 27th, 2008 06:47
engine shop and exhaust robcedar666 South East Chapter 0 March 28th, 2006 00:48


All times are GMT -7. The time now is 05:42.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014