Spark plugs - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Site Information > New Members - Welcome!

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 09-10-2014, 03:02 PM
Member
 
Join Date: Sep 2014
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 904
utilitywagon is on a distinguished road
Spark plugs

Hi;
I'm the new kid on the block, I have been driving jeeps since 1965, I now derive a 2008 Grand Cherokee Overland 5.7 V8 HEMI with 85,000 mi.

I am getting about 17.5 mpg & the Jeep is still running great & it still has the original plugs in it. Should I start thinking about replacing the spark plugs. The manual suggests changing the plugs every 30,000 mi.

utilitywagon

Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 09-10-2014, 03:56 PM
2string1's Avatar
Member
 
Join Date: Jun 2014
Posts: 937
Thanks: 0
Thanked 35 Times in 28 Posts
Rep Power: 1937
2string1 is on a distinguished road
Garage
Re: Spark plugs

How do people with a Hemi get 17.5 mpg? I only get 14.7 on a trip and about 11 in town. I don't have a heavy foot...
Reply With Quote
  #3  
Old 09-10-2014, 04:34 PM
Member
 
Join Date: Sep 2014
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 904
utilitywagon is on a distinguished road
Re: Spark plugs

I do have a heavy foot & I was starting to worry because I had dropped down to 16.6 mpg. this summer, but I guess that might be due to using the air conditioner every day. The only thing that I do is put 6oz of lucas oil in the gas tank every 1500 mi. & I did go to a K&N air filter. The Jeep is now 7 yrs old & it still has the original battery.
Go figure

utilitywagon
Reply With Quote
  #4  
Old 09-10-2014, 06:31 PM
Sleeps's Avatar
Senior Member
My Jeep: 2005 5.7L WK
 
Join Date: Oct 2013
Posts: 1,111
Thanks: 0
Thanked 71 Times in 64 Posts
Rep Power: 582218
Sleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond repute
The hemi will really basically run on anything spark wise. When i bought my 2005 the plugs had no tips on them and still ran pretty good but huge difference to when i put new ones in and also better mpg. I would atleast look at your spark plugs to see what they look like and


If traffic lets me and more important my foot i can get 19ish at 70 (just over 2k rpm) on the freeway. If in traffic (stop and go) or being an idiot its around 15 to 16 on the highway which it mostly is.
Reply With Quote
  #5  
Old 09-11-2014, 06:22 PM
Member
 
Join Date: Sep 2014
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 904
utilitywagon is on a distinguished road
Re: Spark plugs

sleeps,
any tips on installing new plugs.

utilitywgon
Reply With Quote
  #6  
Old 09-11-2014, 07:13 PM
Sleeps's Avatar
Senior Member
My Jeep: 2005 5.7L WK
 
Join Date: Oct 2013
Posts: 1,111
Thanks: 0
Thanked 71 Times in 64 Posts
Rep Power: 582218
Sleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond repute
Quote:
Originally Posted by utilitywagon View Post
sleeps,
any tips on installing new plugs.

utilitywgon
I think there is a post on here about what tools you need but ill list it spark plug socket, 5 inch extension, 3/8s ratchet, 10mm socket, spark plug gapper( like 2 maybe 3 bucks at the auto store), silicone forgot the name but they should offer it to you when you buy the spark plugs and the stupid amount of 16 spark plugs.

As far as tips go and take it how you want i suck at explaining stuff if i cant show you personally.. take your time with taking them out since they could brake and cause more headaches. When you put them back in. I just drop them down and then hand tighten them with the extension and socket so i dont cross thread them. As far as how much to torque them it calls for 14 ft lbs but i dont have a torque wrench that goes down that low so go till its tight. They have an anti torque measure on them so go till they can't and your done. Work on a cylinder at a time so you dont get mixed up on the plugs. Should take you maybe hour or two the first time.

Stuff to look out for is oil.. well alot of it. I had some on the back two passenger side and had to reseal the valve cover. If you run into anything that your not sure of just post it here and ill try to help. Best of luck!
Reply With Quote
  #7  
Old 09-12-2014, 10:04 AM
Member
 
Join Date: Sep 2014
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 904
utilitywagon is on a distinguished road
Re: Spark plugs

sleeps,

Thanks tor the advice.
I have all of the tools my only problem is keeping track of them. I had to put up a chalk board in my garage to keep track of who I loaned them to.

Thanks again,

utilitywagon
Reply With Quote
  #8  
Old 09-20-2014, 09:09 PM
Sleeps's Avatar
Senior Member
My Jeep: 2005 5.7L WK
 
Join Date: Oct 2013
Posts: 1,111
Thanks: 0
Thanked 71 Times in 64 Posts
Rep Power: 582218
Sleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond reputeSleeps has a reputation beyond repute
Any updates yet on this?
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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
How to change the spark plugs on a 4.7 V8 WK Grand Cherokee or Commander Scottina06 Technical Tips/DIY/How-To 31 03-20-2013 10:41 PM
1999 WJ Spark Plugs Andrew Engine Performance/Intake/Exhaust 25 07-21-2012 09:19 AM
Spark plugs!!!! jeeppro Grand Cherokee - WK 58 06-07-2011 03:00 PM
Spark plugs? mzh29 Performance Modifications 9 09-22-2009 07:03 PM
Has Anyone Ever Used Pulstar Spark Plugs? jeeppro Performance Modifications 16 06-02-2009 09:32 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 06:18 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.