from 235s to 31s. made my jeep slow - 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 > ZJ Grand Cherokee Forum > from 235s to 31s. made my jeep slow

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineSavvy/Currie Aluminum Control ArmsRockridge 4WD IS Taking Zone Offroad Suspension Lift Kits

Reply
Unread 06-29-2008, 08:12 PM   #1
GrandJC78
Registered User
1996 ZJ 
 
Join Date: Nov 2007
Location: Illinois
Posts: 135
from 235s to 31s. made my jeep slow

1996 Jeep Grand Cherokee I6 4.0l

just replaced the crankshaft position sensor because it wouldnt even start. we hooked up a powertech programmer and the code p0320 Ignition/distributor engine speed input circuit. does anybody know what this means? i read that it might have something to do with the crankshaft position sensor. check engine light is not on. im running 31 by 10.50 15 tires and am thinking this may be part of the reason. would any of the sensors prevent it from being fast. when i put the pedal to the floor it redlines at like 3700 rather than 5800 and is just overall slow. anyone have any opinions/suggestions? thanks. also has k and n intake and new plugs and wires.

GrandJC78 is offline   Reply With Quote Quick reply to this message
Unread 06-30-2008, 06:50 AM   #2
ratmonkey
R.I.P.
 
ratmonkey's Avatar
1997 ZJ 
 
Join Date: Dec 2006
Location: , Pennsylvania
Posts: 19,794
did you put the plug wires on correctly, check to be sure. did this start after the plugs and wires?

the tires will effect acceleration, but not your motor's redline.

the code could be a stored code from the bad sensor that didn't clear, did you disconnect the battery to clear the old codes?
__________________
'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

ratmonkey is offline   Reply With Quote Quick reply to this message
Unread 06-30-2008, 07:49 AM   #3
Redbob
Registered User
2004 WJ 
 
Join Date: Jul 2006
Location: North Texas
Posts: 1,069
You could have done something with the crankshaft position sensor so the ignition timing is way off; but that fault code will also come up if your timing (cam) chain is stretched much too far, so the timing is way off, or it may even have jumped a tooth, which will also give you the symptoms you've described.
Check out the timing chain before you go a lot farther.
Redbob is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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


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.