check engine light after new engine - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 03-18-2011, 08:26 AM   #1
Jeeper
 
Jma20a's Avatar
 
Join Date: Apr 2007
Location: Fairfield, CT
Posts: 3,046
check engine light after new engine

had to replace the engine in my jeep with a jasper engine. the check engine light came on yesterday, mechanic said it was for the gas cap not being tight. is there even a sensor for the gas cap on a '99?

Jma20a is offline   Quote Quick Reply
Old 03-18-2011, 08:42 AM   #2
Jeeper
 
SurfKaster's Avatar
 
Join Date: Mar 2010
Location: St. Augustine FL
Posts: 1,503
I don't think there is sensor for the cap, but the fuel pressure. If your cap isn't making a tight seal then it can throw a code.

SurfKaster is online now   Quote Quick Reply
Old 03-18-2011, 08:46 AM   #3
Jeeper
 
Join Date: Jan 2011
Location: Maryland's Eastern Shore
Posts: 45
Just happened to me and the code is P1486. Which states the EVAP hose in a pinched condition. Contacted the service department and they said the common cause for that code is the gas cap not getting a good enough seal when tightened. Quick Fix and now the light is off. HOpe this helps.
sjviola is offline   Quote Quick Reply
Old 03-18-2011, 08:49 AM   #4
Jeeper

WF Supporting Member
 
99jeeper's Avatar
 
Join Date: Feb 2011
Location: nothern michigan
Posts: 449
Images: 3
wish i could give ya a positive answer,but.... i have a 99 and have put fuel in with the jeep running and have not had a light come on. so not sure on the sensor.
__________________
99jeeper is offline   Quote Quick Reply
Old 03-18-2011, 04:18 PM   #5
Jeeper
 
Jma20a's Avatar
 
Join Date: Apr 2007
Location: Fairfield, CT
Posts: 3,046
do i need a code reader to find out what code it is? or is here some fancy way of getting it?
Jma20a is offline   Quote Quick Reply
Old 03-18-2011, 07:41 PM   #6
Jeeper
 
CJS98TJ's Avatar
 
Join Date: Oct 2010
Posts: 560
Images: 1
I have a 98 tj 4cyl and mine does have a gas cap sensor mine went on a couple weeks ago got it check and it read the mechanic said gas cap leak so I bought a new one and now it's all better

I'm do not know if that kind of stuff is different between years.
__________________
CJS98TJ is offline   Quote Quick Reply
Old 03-18-2011, 10:57 PM   #7
Jeeper
 
Jma20a's Avatar
 
Join Date: Apr 2007
Location: Fairfield, CT
Posts: 3,046
talked to my mechanic and he said it was one of the vacuum lines or some line coming from the gas tank that has the sensor giving off the code. just needs to be re-calibrated after the jeeps computer was left without power from the install of the new engined that made it go a-wall, and yes i am at a .25 on my bretholizer after st. patts, and have not had a drink yet.
Jma20a is offline   Quote Quick Reply
Old 03-18-2011, 11:59 PM   #8
Jeeper
 
meyers's Avatar
 
Join Date: Apr 2009
Location: Dover, New Hampshire
Posts: 738
There is no sensor for the gas cap. What happens is the gas cap leaks either because it is loose, a bad gasket/o ring or the cap vent is defective. This causes the emissions monitoring system to throw a code indicating a leak in the system.

It is basically like a scale with constant normal weight is 1 lb. But when the system goes to 1.5 lbs or .5 lbs for a sustained period it throws a code.
meyers is offline   Quote Quick Reply
Old 03-19-2011, 12:38 AM   #9
Jeeper
 
Join Date: Feb 2011
Location: Madison, WV
Posts: 57
Quote:
Originally Posted by Jma20a
do i need a code reader to find out what code it is? or is here some fancy way of getting it?
On my 06 I can turn the key from off to on in three quick successions and it will tell me the code on the dash. Hope this helps.
__________________
/Hager
2006 Rubi *work in progress*
Greg_Hager is offline   Quote Quick Reply
Old 03-20-2011, 01:54 AM   #10
Jeeper
 
CJS98TJ's Avatar
 
Join Date: Oct 2010
Posts: 560
Images: 1
Yeah that does make more sense. Thanks for the correction.
__________________
CJS98TJ is offline   Quote Quick Reply
Old 03-20-2011, 01:05 PM   #11
Jeeper
 
Jma20a's Avatar
 
Join Date: Apr 2007
Location: Fairfield, CT
Posts: 3,046
i tried to get a code by turning the ignition on and off 3 times but there was no code.

and how do i get rid of this check engine light?
Jma20a is offline   Quote Quick Reply
Old 03-20-2011, 01:11 PM   #12
Jeeper

WF Supporting Member
 
99jeeper's Avatar
 
Join Date: Feb 2011
Location: nothern michigan
Posts: 449
Images: 3
buy a code reader, you might need it down the road later. i bought mine off the mac tool truck for 65. but you can get cheaper ones at autozone or etc.

__________________
99jeeper 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
Decoding Check Engine Light Gumpy2030 TJ General Discussion Forum 17 03-09-2011 10:46 PM
Check Engine Light workingdad TJ Tech Forum 2 12-13-2010 11:37 PM
Check engine light the old guy TJ Tech Forum 3 11-25-2010 02:41 PM
check engine light? NEED HELP shorty8914446 TJ Tech Forum 4 03-08-2010 04:26 PM
Check Engine Light vin211 TJ Tech Forum 4 04-07-2008 09:12 AM



» Featured Product

All times are GMT -5. The time now is 06:11 AM.



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