99 wj that hesitates while accelerating. - 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 Grand Cherokee & Commander Forums > WJ Grand Cherokee Forum > 99 wj that hesitates while accelerating.

Nitro Gear Packages Now Available at Rockridge 4wdFS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitFS: Wranger BRIGHT License Plate LED! Just $3! Great value

Reply
Unread 06-17-2010, 02:00 PM   #1
ljhopp
Registered User
1999 WJ 
 
Join Date: Jun 2010
Location: iowa
Posts: 277
99 wj that hesitates while accelerating.

I have a 99 wj that when I accelerate quickly the wj will studder or hesitate at 3000 rpm's then takes off again.

There are no check engine lights on. Just recentely I had a code p1391 came on and the engine had the same problem. I replaced the ckp and the hesiation went away but the sensor went out again, so I got a mopar ckp to replace the advance auto parts store one. The check engine light went off but the hesistion has stayed. This also a reman engine.

I am wondering what could the problem be? Could the tps be causing this. Also if i accelerate normal the engine will not hesiatate.

ljhopp is offline   Reply With Quote
Unread 06-17-2010, 07:38 PM   #2
ljhopp
Registered User
1999 WJ 
 
Join Date: Jun 2010
Location: iowa
Posts: 277
Does anybody have an idea of what could be causing this? I think it's the tps going out.
ljhopp is offline   Reply With Quote
Unread 06-17-2010, 07:43 PM   #3
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,345
Quote:
Originally Posted by ljhopp View Post
I think it's the tps going out.


The TPS can be tested with a digital voltmeter.
The center terminal of the TPS is the output terminal.
With the ignition key in the ON position, check the
TPS output voltage at the center terminal wire of the
connector. Check this at idle (throttle plate closed)
and at wide open throttle (WOT). At idle, TPS output
voltage should be greater than .350 millivolts and
less than 900 millivolts. At wide open throttle, TPS
output voltage must be less than 4.5 volts. The output
voltage should increase gradually as the throttle
plate is slowly opened from idle to WOT.
ZeeJay1997 is online now   Reply With Quote
Unread 06-17-2010, 09:23 PM   #4
ljhopp
Registered User
1999 WJ 
 
Join Date: Jun 2010
Location: iowa
Posts: 277
I will try that tom. Thanks
ljhopp is offline   Reply With Quote
Unread 06-18-2010, 05:29 PM   #5
ljhopp
Registered User
1999 WJ 
 
Join Date: Jun 2010
Location: iowa
Posts: 277
I checked the mv volts on the middle terminal and the volts fluctated all over the place. from .000 to 1.0 at idle. Could a bad tps also trigger a p 1391 because the engine light just came on and I replace my ckp with a mopar one.
ljhopp is offline   Reply With Quote
Unread 06-19-2010, 08:35 PM   #6
ljhopp
Registered User
1999 WJ 
 
Join Date: Jun 2010
Location: iowa
Posts: 277
I replaced the tsp and the hesiatation got worse. So I think I am gonna get a camshaft position sensor and try that.

I replaced the cam sensor and it did not fix the problem.

Last edited by ljhopp; 06-21-2010 at 09:15 PM..
ljhopp is offline   Reply With Quote
Unread 06-21-2010, 05:37 PM   #7
Dr-Detjen
Registered User
2000 WJ 
 
Join Date: Feb 2008
Location: Tucson
Posts: 74
I Have a 2000 limited 4.7 and it was doing the same thing, doggy in the low RPM's then 3000+ Bam power band. Had been that way for about 3-4 months... then It started stalling ramdomly, no codes. finally replace both Crank position sensor and Camshaft position sensor (as I read on jf.com) and getting the p1391 code. Had my PCM tested and failed on multiple sensors including on the Throttle position sensor. Replacing my PCM TODAY! I'll report back.

Last edited by Dr-Detjen; 08-09-2010 at 11:49 PM..
Dr-Detjen is offline   Reply With Quote
Unread 06-21-2010, 09:13 PM   #8
ljhopp
Registered User
1999 WJ 
 
Join Date: Jun 2010
Location: iowa
Posts: 277
Quote:
Originally Posted by Dr-Detjen View Post
I Have a 2000 limited 4.7 and it was doing the same thing, doggy in the low RPM's then 3000+ Bam power band. Had been that way for about 3-4 months... then It started stalling ramdomly, no codes. finally replace both Crank position sensor and Camshaft position sensor (as I read on gf.com) and getting the p1391 code. Had my PCM tested and failed on multiple sensors including on the Throttle position sensor. Replacing my PCM TODAY! I'll report back.
Thanks, I think I have a bad pcm also.
ljhopp 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.