89 Cherokee Sudden Loss Of Power. - Page 2 - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > 89 Cherokee Sudden Loss Of Power.

FS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitTHE NEW! VANCO DUAL MODE 15/16″ Big Brake Kit w/BlaFS: Wranger BRIGHT License Plate LED! Just $3! Great value

Reply
Unread 05-07-2009, 11:32 PM   #16
HankyDanky
Registered User
1989 XJ Cherokee 
 
Join Date: Jun 2008
Location: Scottsdale, AZ
Posts: 596
Quote:
Originally Posted by 1deadeye View Post
Here is a link for the Renix ignition. It shows you testing for the renix ignition.

http://jeep.zerok.ru/index.php?page=21

Is your exhaust plugged. Bad cat.
Scott
Hey thats alot of great information!! Thanks alot man, gave me some good ideas. I have literally almost checked everything and have not found the problem yet. Cat, exhaust, every thing is new. Double checked it again by by pulling the front pipe and seeing if the power would come back. Nada. Thanks alot though.

__________________
1989 Cherokee 4.0l, Rubicon Express 4.5" XJ Super-Flex System, 33x12.50x15 KM2's

The XJ Rebuild- http://www.jeepforum.com/forum/f22/m...build-1327643/

People are always grabbing the handles, clutching the seat, or stomping an imaginary brake peddle when we're out having fun.
HankyDanky is offline   Reply With Quote
Unread 05-08-2009, 08:46 AM   #17
dover21
Registered User
2007 JK Wrangler 
 
Join Date: Feb 2009
Location: Enterprise, Alabama
Posts: 2,297
Are the brake pads in contact with the rotors? That kind of friction could definitely hamper any smooth and powerful acceleration.
dover21 is offline   Reply With Quote
Unread 05-08-2009, 08:50 AM   #18
cbordea
Registered User
1998 XJ Cherokee 
 
Join Date: Nov 2008
Location: NC
Posts: 734
yeah, i had a problem similar one time and realized my ebrake was on ;-)
__________________
88 MJ I6 4x4 Stock my hauler - Sold
98 XJ I6 4X4 Stock my son's DD
06 12V Purple Barbie Jeep my daughter's DD :-)
cbordea is offline   Reply With Quote
Unread 05-08-2009, 11:32 AM   #19
88XJSport
Registered User
1988 XJ Cherokee 
 
Join Date: Jul 2005
Location: Michigan
Posts: 4,324
What is the input/output voltage on the TPS, and is it adjusted according to the FSM?

What is your PSI at the fuel rail? 31psi is minimum needed.
88XJSport is offline   Reply With Quote
Unread 05-08-2009, 11:35 AM   #20
Finallyajeep
Registered User
2000 XJ Cherokee 
 
Join Date: Sep 2008
Location: Philadelphia, PA
Posts: 1,148
Hows your air filter?
__________________
Firefighters Jeep Club

FOR SALE PM me if interested!
C-rok outer steering box brace new, never installed. Also have an XJ trailer hitch for sale, needs some paint, but thats about it.
Finallyajeep is offline   Reply With Quote
Unread 05-08-2009, 11:39 AM   #21
MA88XJDude
Registered User
1988 YJ Wrangler 
 
Join Date: May 2008
Location: Massachusetts
Posts: 581
sounds like when my cat was getting clogged
__________________
http://www.ruggedpathtrailers.com
88' YJ/CJ Turbo Diesel
99' XJ (Daily Driver)
Build thread:http://www.jeepforum.com/forum/f22/s...build-1066682/
MASSKRAWLERS.COM
MA88XJDude is offline   Reply With Quote
Unread 05-08-2009, 11:53 AM   #22
88XJSport
Registered User
1988 XJ Cherokee 
 
Join Date: Jul 2005
Location: Michigan
Posts: 4,324
Quote:
Originally Posted by MA88XJDude View Post
sounds like when my cat was getting clogged
He said his was clear.
88XJSport is offline   Reply With Quote
Unread 05-08-2009, 12:54 PM   #23
1deadeye
Registered User
1988 XJ Cherokee 
 
Join Date: Feb 2009
Location: Wi
Posts: 45
Quote:
Originally Posted by HankyDanky View Post
Hey thats alot of great information!! Thanks alot man, gave me some good ideas. I have literally almost checked everything and have not found the problem yet. Cat, exhaust, every thing is new. Double checked it again by by pulling the front pipe and seeing if the power would come back. Nada. Thanks alot though.
Any time. Let us know what you find. So I can had it to my ever forgetful memory.

Scott
1deadeye is offline   Reply With Quote
Unread 05-08-2009, 02:01 PM   #24
HankyDanky
Registered User
1989 XJ Cherokee 
 
Join Date: Jun 2008
Location: Scottsdale, AZ
Posts: 596
Quote:
Originally Posted by dover21 View Post
Are the brake pads in contact with the rotors? That kind of friction could definitely hamper any smooth and powerful acceleration.
No the brakes suck as it is with the 33's so thats not it.

Quote:
Originally Posted by cbordea View Post
yeah, i had a problem similar one time and realized my ebrake was on ;-)
.

lol, E-Brake is def. not on

Quote:
Originally Posted by 88XJSport View Post
What is the input/output voltage on the TPS, and is it adjusted according to the FSM?


What is your PSI at the fuel rail? 31psi is minimum needed.
I got a reading of .827 when you divide the output by the input and optimal is .830. Can be between .825 and .835

PSI was 41 so its all good.

Quote:
Originally Posted by Finallyajeep View Post
Hows your air filter?
Air filter is clean.
__________________
1989 Cherokee 4.0l, Rubicon Express 4.5" XJ Super-Flex System, 33x12.50x15 KM2's

The XJ Rebuild- http://www.jeepforum.com/forum/f22/m...build-1327643/

People are always grabbing the handles, clutching the seat, or stomping an imaginary brake peddle when we're out having fun.
HankyDanky is offline   Reply With Quote
Unread 03-11-2011, 09:39 AM   #25
HankyDanky
Registered User
1989 XJ Cherokee 
 
Join Date: Jun 2008
Location: Scottsdale, AZ
Posts: 596
Figured I would update this, when I installed the new TPS there is a bar that moves when the throttle opens/closes which in turn provided the correct air/fuel ratio. The lever was not catching on the bar, which in turn made the computer think that the throttle body was closed all the time. Result? NO POWER! lol, So make sure if you install one, that it is put in correctly. Thats all!
__________________
1989 Cherokee 4.0l, Rubicon Express 4.5" XJ Super-Flex System, 33x12.50x15 KM2's

The XJ Rebuild- http://www.jeepforum.com/forum/f22/m...build-1327643/

People are always grabbing the handles, clutching the seat, or stomping an imaginary brake peddle when we're out having fun.
HankyDanky is offline   Reply With Quote
Unread 03-11-2011, 11:32 AM   #26
Topgun514
Registered User
1988 XJ Cherokee 
 
Join Date: Jul 2006
Location: Salt Lake City, UT
Posts: 1,798
Quote:
Originally Posted by HankyDanky View Post
Figured I would update this, when I installed the new TPS there is a bar that moves when the throttle opens/closes which in turn provided the correct air/fuel ratio. The lever was not catching on the bar, which in turn made the computer think that the throttle body was closed all the time. Result? NO POWER! lol, So make sure if you install one, that it is put in correctly. Thats all!
I did this too...duhhh


but I hope 2 years later he figured out the issue.
__________________
87 XJ pioneer-Totalled
96 XJ Sport- Sold
Now: 88 RENIX 4.0 XJ, Project Overlander
3.5" Lift, RE SF LCA's with skids, 31x10.50R15 Duratracs, ARB Roofrack, Custom Bumper, Glasspack, Bored TB, Custom seats
Topgun514 is offline   Reply With Quote
Unread 03-11-2011, 09:01 PM   #27
HankyDanky
Registered User
1989 XJ Cherokee 
 
Join Date: Jun 2008
Location: Scottsdale, AZ
Posts: 596
Quote:
Originally Posted by Topgun514 View Post
I did this too...duhhh


but I hope 2 years later he figured out the issue.
Ha, yeah it didn't take me more than a couple days and a lot of headaches to figure it out. Just haven't been on the forum in forever..
__________________
1989 Cherokee 4.0l, Rubicon Express 4.5" XJ Super-Flex System, 33x12.50x15 KM2's

The XJ Rebuild- http://www.jeepforum.com/forum/f22/m...build-1327643/

People are always grabbing the handles, clutching the seat, or stomping an imaginary brake peddle when we're out having fun.
HankyDanky is offline   Reply With Quote
Unread 03-11-2011, 10:48 PM   #28
my2monkeys
Registered User
1989 XJ Cherokee 
 
Join Date: Jan 2007
Location: Mission Viejo CA
Posts: 89
So the tang on the TPS wasn't on the correct side of the Thottle body tang?

I'm surprised it accellerated at all.

It shifted thru gears with an at idle input to the TCU is also something I wouldn't expect.

Thanks for posting up with your fix.
__________________
wifes 95zj 4.0 42re np249 201,000mi

mine 89 xj 4.0 aw4 np242 445,000mi

nephews 98 zj laredo 4.0 2WD 213690mi
my2monkeys is offline   Reply With Quote
Unread 03-11-2011, 11:03 PM   #29
HankyDanky
Registered User
1989 XJ Cherokee 
 
Join Date: Jun 2008
Location: Scottsdale, AZ
Posts: 596
Yeah it was really strange.. When you put the TPS in, you have to almost angle to catch that bar. If you don't it will sit on top of it and will not do ya any good.
__________________
1989 Cherokee 4.0l, Rubicon Express 4.5" XJ Super-Flex System, 33x12.50x15 KM2's

The XJ Rebuild- http://www.jeepforum.com/forum/f22/m...build-1327643/

People are always grabbing the handles, clutching the seat, or stomping an imaginary brake peddle when we're out having fun.
HankyDanky is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.