Jeep Garage  - Jeep Forum

Jeep Garage - Jeep Forum (http://www.jeepgarage.org/forums.php)
-   Engine Performance/Intake/Exhaust (http://www.jeepgarage.org/f196/)
-   -   Changed Spark plugs on my 4.0 (http://www.jeepgarage.org/f196/changed-spark-plugs-on-my-4-0-a-9944.html)

mon_21 06-02-2010 11:38 AM

Changed Spark plugs on my 4.0
 
Like the title says, changed it today and what a difference it made.

This is not a detailed How to, its so simple that a few pictures will do the trick.

tools needed:

13mm socket, wrench
extension
spark plug socket with rubber insert
anti seize ( optional )
gap tool
spark plugs

http://i334.photobucket.com/albums/m...p/DSC03517.jpg
http://i334.photobucket.com/albums/m...p/DSC03508.jpg
http://i334.photobucket.com/albums/m...p/DSC03509.jpg
http://i334.photobucket.com/albums/m...p/DSC03502.jpg
Begin by removing the 4 bolts of the coil.
http://i334.photobucket.com/albums/m...p/DSC03515.jpg
This is how it looks disconnected. ( note: theres an electrical connection at the back end of the coil, you can disconnect it if you want to make it easier )
http://i334.photobucket.com/albums/m...p/DSC03511.jpg
Remove the old spark plugs with the spark plug socket:
http://i334.photobucket.com/albums/m...p/DSC03500.jpg
Here they are for comparison, and after being gapped accordingly:
http://i334.photobucket.com/albums/m...p/DSC03507.jpg
Ready to install new ones:
http://i334.photobucket.com/albums/m...p/DSC03503.jpg
Begin by screwing with hands, then with wrench, tighten it about 1/4 turn.

Do the same with the remaining plugs, reinstall the coil and you are done:
All buttoned up:
http://i334.photobucket.com/albums/m...p/DSC03512.jpg
Checking for CEL:
http://i334.photobucket.com/albums/m...p/DSC03513.jpg

Test drove it after i was done, and the jeep runs beautifully.......Hope this helps you guys out!

took me about 30 minutes from start to finish, should have done it a long time ago but I kept putting it off......

Chaoul1 06-02-2010 01:30 PM

Re: Changed Spark plugs on my 4.0
 
WOW Mon! I needed to do that to my old WJ. Is it a big difference? Does it feel more responsive now?

violant00 06-02-2010 01:39 PM

Re: Changed Spark plugs on my 4.0
 
question did you have to change the gaps... i replaced mine but didn't modify any gaps wondering if that is a problem or not

straty1987 06-02-2010 01:43 PM

Re: Changed Spark plugs on my 4.0
 
how old and many miles did teh old ones have?

if people want a decent write up look hear http://wjjeeps.com/service/sparkplugs.htm

violant00 06-02-2010 01:44 PM

Re: Changed Spark plugs on my 4.0
 
Im pretty sure a lot because they looked just like your old ones..I replaced them not to long ago and theres not much of a diff but the power is def better.
Quote:

Originally Posted by straty1987 (Post 216145)
how old and many miles did teh old ones have?

if people want a decent write up look hear http://wjjeeps.com/service/sparkplugs.htm


mon_21 06-02-2010 02:11 PM

Re: Changed Spark plugs on my 4.0
 
Quote:

Originally Posted by Chaoul1 (Post 216136)
WOW Mon! I needed to do that to my old WJ. Is it a big difference? Does it feel more responsive now?

Yeah Paul it is actually a lot better, there was hesitation with the last set of plugs especially when the AC was on.

Quote:

Originally Posted by violant00 (Post 216140)
question did you have to change the gaps... i replaced mine but didn't modify any gaps wondering if that is a problem or not

I did check all for gap even thou it was saying that they are already gapped. Only 2 of the 6 were a bit off...... if yours doesnt misfire since replacing it, you should be ok.

Quote:

Originally Posted by straty1987 (Post 216145)
how old and many miles did teh old ones have?

Jeep is now 139772, I got it when it was around 126500 and that was 2 years ago....


All times are GMT -5. The time now is 08:51 AM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community