Loosing power at 1000 RPM's won't accelerate - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 05-26-2007, 12:19 PM   #1
Newb
 
Join Date: May 2007
Posts: 11
Loosing power at 1000 RPM's won't accelerate

I have recently swapped out my distributor, timed, and replaced distributor cap and rotor. 98 4.0 6cyl turns over right away, and idles perfect. The problem is when I start driving I loose any acceleration past 1000 RPM's, tried shifting into 2nd gear and same thing... anyone?

jkincel is offline   Quote Quick Reply
Old 05-26-2007, 12:20 PM   #2
Newb
 
Join Date: May 2007
Posts: 11
I have re-timed everything exactly the way it should and double and triple checked everything, reset the distributor, brand new cap and rotor, new plugs and wires. this last time it accelerated fine but a little past 2000 RPM it made a poping noise and became slugish, and now wont accelerate past 1000RPM's again. I have been at this for 3 days with the resolve of one problem leading to the next... please any advice is appreciated

jkincel is offline   Quote Quick Reply
Old 05-26-2007, 12:22 PM   #3
Jeeper
 
Odhinn's Avatar
 
Join Date: Aug 2006
Posts: 2,147
Is it idleing rough?
__________________
Recently returned from the Jeep Dead.
and
Proud daddy to a New baby Jeep Girl.
Odhinn is offline   Quote Quick Reply
Old 05-26-2007, 12:27 PM   #4
Newb
 
Join Date: May 2007
Posts: 11
it is idleling perfectly smooth
jkincel is offline   Quote Quick Reply
Old 05-26-2007, 12:33 PM   #5
Jeeper
 
Odhinn's Avatar
 
Join Date: Aug 2006
Posts: 2,147
Your timing chain could have jumped a tooth, or the pop could have damaged one of your sensors. Hard to say without seeing it. Someone here may have personal experience with something similar.

Wish I could help further.
__________________
Recently returned from the Jeep Dead.
and
Proud daddy to a New baby Jeep Girl.
Odhinn is offline   Quote Quick Reply
Old 05-26-2007, 01:59 PM   #6
Jeeper
 
Scotty355's Avatar
 
Join Date: Aug 2006
Location: Freeland Pa.
Posts: 529
Did it act like this before you replaced everything?
Is this the reason you swapped out the distributer?
__________________
2006 unlimited, 2"BB, JKS disconnects, 33" BFG at
1996 Harley Davidson XL1200c
Scotty355 is offline   Quote Quick Reply
Old 05-26-2007, 02:02 PM   #7
Jeeper
 
Scotty355's Avatar
 
Join Date: Aug 2006
Location: Freeland Pa.
Posts: 529
It could also be that your catalytic converter is blocked solid, too much restiction as the rpms go up.

Just thinking out loud, without seeing it..
__________________
2006 unlimited, 2"BB, JKS disconnects, 33" BFG at
1996 Harley Davidson XL1200c
Scotty355 is offline   Quote Quick Reply
Old 05-26-2007, 03:03 PM   #8
Jeeper
 
foxinthemudd's Avatar
 
Join Date: Apr 2007
Location: oregon
Posts: 2,708
I agree with scotty. I've had similar problems in other rigs I've owned. I'd be driving along then there would be a point where I couldn't go any faster and start decreasing in speed. check the cat.
__________________
Keepin the peace.

The difference between sport and combat is that in combat you bury the one who comes in second.

THANK YOU VETS!
foxinthemudd is offline   Quote Quick Reply
Old 05-26-2007, 04:21 PM   #9
Newb
 
Join Date: May 2007
Posts: 11
I have just got back from testing the fuel pressure, it was fine at 48 PSI. I think that it is the catalytic converter aswell from all the misfires with the timing and distributor. I know a welder, do you think I could salvage one and weld it to my existing setup, or is it better to have a shop take care of it and get a new one?
jkincel is offline   Quote Quick Reply
Old 05-26-2007, 04:25 PM   #10
Newb
 
Join Date: May 2007
Posts: 11
Quote:
Originally Posted by Scotty355 View Post
Did it act like this before you replaced everything?
Is this the reason you swapped out the distributer?
It always seemed like it was loosing power and wasnt very fuel efficient but I thought it was just normal, it had a rough idle before but once I accelerated it would smooth out. A shop told be that it was probably a bad injector but, I believe that it was the distributor now... I have had the car for 10,000 mi now and it is at 150,000 the check engine light has been on since I got it from a shady dealer ignorance on my part, but I have enjoyed working on it.

I replaced the distributer because the shaft was loose and moved back and forth burning up my cap and destroying the rotor.
jkincel is offline   Quote Quick Reply
Old 05-26-2007, 04:39 PM   #11
Jeeper
 
skeeter's Avatar
 
Join Date: Dec 2006
Location: Spokane, Wa.
Posts: 3,869
Send a message via Yahoo to skeeter
Fuel filter, air filter, clogged fuel lines.

BTW, how do you time a 98?
__________________
"But it does me no injury for my neighbour to say there are twenty gods, or no god. It neither picks my pocket nor breaks my leg." - Thomas Jefferson, Notes on the State of Virginia, 1782

Arguing with a truck driver is like wrestling with a pig in mud, eventually you realize the pig enjoys it.
skeeter is offline   Quote Quick Reply
Old 05-26-2007, 05:59 PM   #12
Newb
 
Join Date: May 2007
Posts: 11
Quote:
Originally Posted by skeeter View Post
Fuel filter, air filter, clogged fuel lines.

BTW, how do you time a 98?

Air Filter is brand new and the fuel filter shouldnt be replaced unless you suspect fuel contamination but, the fuel pressure is solid...

To Time a 98 4.0 inline 6

1. Turn the crankshaft with a large socket attached to the balancer hub bolt threded to the front of the vibration dampener wheel.

2. Locate top dead center (TDC), highest point the piston reaches, of piston 1

a. remove spark plug #1 insert a length of wood or plastic (not metal) into the spark plug socket.

b. start cranking the hub bolt while watching the wood. You want the wood to rise out of the spark plug socket, indicating the piston rising. Make sure the wood doesnt become pinched or lodged inside.

c. Next find the notch located on the inside lip of the vibration dampener

d. get a flashlight and a rag, just behind the vibration dampener at about 1 o'clock you will find timing marks (you will need a flashlight to see even in broad daylight) 8|||4|||0| align notch to zero, this is TDC for piston 1.

3. next remove distributor cap and see that the rotor is pointing at the #1 piston for the fireing order, if it is not you will need to adjust the distributor until rotor points at 1 (look on the distributor cap for a 1 indicating the #1 piston)

crack a beer your done

be careful timing yourself for the first time this is how I caused my problems with the catalytic converter. You dont want your enginge starting and misfireing too many times it is hard on the engine and can lead to other issues.

hope this is helpful please respond with any tips or suggestions to these instructions.

jkincel is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

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

Posting Rules
You may post new threads
You may 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Linear amp Question silvergoat Communications and Electronics 19 11-07-2008 05:11 PM
Help! Loosing Power E-33 TJ Tech Forum 2 08-28-2008 09:38 AM
Help!!! Loosing power on the highway ddurand21 YJ Tech Forum 5 11-28-2007 01:00 PM
loosing power girlyjeep YJ Tech Forum 4 04-23-2006 01:15 AM



» Featured Product

All times are GMT -5. The time now is 05:41 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC