Help loses power at random -
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 > General Technical Discussions > Engines & Drivetrain > Help loses power at random

JKS Grand Cherokee WJ, Adjustable Front Trackbar 1"-6Teraflex JK HD Hinged Carrier & Adjustable Spare Tire FREE, FREE, FREE EVENT!! Save big on Lockers now till Apri

Unread 04-03-2013, 10:58 PM   #1
Registered User
Join Date: Mar 2013
Location: Paramount, California
Posts: 5
Help loses power at random

2000 jeep grand cherokee 6 cylinder

at random it louses power or a second or two and it comes back or at a light sometimes it stalls

what iv replaced so far

new spark plugs
replaced IAC (idle air control)
fuel filter
fuel pump
I have also gone over the obvious louse wires broke wires cracked vaccume lines dident find anything

Had it diagnostic at pep-boys they said it was the fuel pump. they said when it happens the fuel pressure drops down to nothing then comes back up

i would think if its something else the fuel pressure would stay up cuz the pump is electric and it does not lose electrical power.

I hooked it up to a OBD2 reader and some o the items are not reporting heres the screenshots of the sensors that its reporting

I would think the ! would mean something wrong. though its not trowing any error codes

Please help!!

ozzman39 is offline   Reply With Quote Quick reply to this message
Unread 04-04-2013, 08:04 AM   #2
Registered User
Join Date: Feb 2013
Location: Ottawa, Ontario
Posts: 57
Sounds like a Throttle position sensor, would have a mechanic loook at it may be cheaper by now.

Does your car start right up? that is the time where the fuel pump gets worked the hardest has to pressurize from 0 psi to around 55.

If it does then i would think it not your pump but something the computer relies on for closed loop operation, ECT, TPS, CMP, CKP, MAP.

If yuo put your foot doewn and it doesn't respond for 2 seconds, then it s tps. Remove clean and test, retry then if it dont work go by a new one, so many parts tha still work get replaced everyday so that some guy at the parts store can get paid. i would expect the fuel pump is fine hard to say tho.
TDIJeep is offline   Reply With Quote Quick reply to this message

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools

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