Basic Tune-Up - JKowners.com : Jeep Wrangler JK Forum
 
LinkBack Thread Tools Display Modes
post #1 of 8 Old 02-10-2012, 10:38 PM Thread Starter
Granite Guru
 
Butkus34's Avatar
 
Join Date: Aug 2010
Location: Adams, ND
Posts: 362
Feedback: 0 reviews
Basic Tune-Up

I'm at just under 85,000 on my 2007 and yesterday I am driving at 65 on the highway and lose a little bit of what power I have and can hear a miss or sputter. The check engine light came on and stayed blinking unless my rpm's went under 1400 for some reason. I used the trouble shooting on this site and figured it down to the spark plugs, wires, or coil. Well, thought I might as well do them all as I would be taking them out and checking everything.

The coil was bad with no current flowing through one of the points so I knew I was replacing that. Went with the NGK Iridium plugs and Carquest premium wires. The coil is the same one that Ford uses so that was easy to find too. Replaced them all today and it's running great. Will update if I see any of the crazy improvements people claim in MPG's and HP. I expect none but just happy with the Jeep running right again.

2007 JK Unlimited Sahara, Blacked Out
3.5 inch lift sitting on 35's
Poly Performance/Synergy Suspension Ball Joints
Smittybilt Oversized Tire Carrier
Butkus34 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 02-10-2012, 10:39 PM Thread Starter
Granite Guru
 
Butkus34's Avatar
 
Join Date: Aug 2010
Location: Adams, ND
Posts: 362
Feedback: 0 reviews

And by the way, they say they are 100,000 for a tune-up but the plugs and all else sure didn't look that great when I removed them.

2007 JK Unlimited Sahara, Blacked Out
3.5 inch lift sitting on 35's
Poly Performance/Synergy Suspension Ball Joints
Smittybilt Oversized Tire Carrier
Butkus34 is offline  
post #3 of 8 Old 02-11-2012, 01:42 PM
JKO Addict!
 
07unlimitedx's Avatar
 
Join Date: Dec 2008
Location: Calgary Alberta
Age: 49
Posts: 2,286
Garage
Feedback: 1 reviews

Keep us informed


Sent from my iPhone using Tapatalk

2014 JKU, Tera44, 4.56 gears, ARB lockers, RK 3.5" flex lift, ARB front & rear bumper, dual Viair 400C w/2 gallon tank, Zeon 10S, Nitto Tires, Genesis Dual battery kit, TeraFlex tie rod & flipped drag link, ARB Intensities and TeraFlex dual rate ST sway bar.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
07unlimitedx is offline  
Sponsored Links
Advertisement
 
post #4 of 8 Old 02-11-2012, 05:23 PM Thread Starter
Granite Guru
 
Butkus34's Avatar
 
Join Date: Aug 2010
Location: Adams, ND
Posts: 362
Feedback: 0 reviews

I plan on doing a tank by tank assessment so I will give numbers as I get them. One thing to check is if your coil is firing properly. To check use rubber insulated or thick leather gloves and a pliers that have rubber handles.
1. Have the vehicle running, just idle, and then remove the spark plug wire at the coil one by one checking for spark.

2. Be careful as you can get one hell of a shock, but the spark should be strong and jump a possible 1 to 2 inch gap, you don't need to seperate it that much.

3. If there is no spark, then you have a bad coil and it needs to be replaced.

Here's a link for the coil and a link for plug wires.

Spark plug wires
http://www.autopartswarehouse.com/se...ark plug wires

Coil
http://www.jeep4x4center.com/ignitio...32520ae-m.html

2007 JK Unlimited Sahara, Blacked Out
3.5 inch lift sitting on 35's
Poly Performance/Synergy Suspension Ball Joints
Smittybilt Oversized Tire Carrier
Butkus34 is offline  
post #5 of 8 Old 02-13-2012, 07:23 PM Thread Starter
Granite Guru
 
Butkus34's Avatar
 
Join Date: Aug 2010
Location: Adams, ND
Posts: 362
Feedback: 0 reviews

I won't have hard number comparisons till after a couple tanks but I can give a couple updates on how the Jeep runs. Keep in mind that my Jeep had 85,000 miles on the original plugs and they looked every bit the part of needing to be replaced.

I can't really say that I feel any seat of the pants hp, but there is a little more pep to it. This most likely is due to just having clean and new plugs in there. Plus if the coil was going bad it's hard to say how that might have been affecting it.

Now the MPG's. Take this with a grain of salt as I don't have a full tank gone yet so I'm just talking about comparing the instant avg. which I can't fully say is true but at least it's common comparison against itself. My Jeep has 35 inch tires and a 3.5 inch lift. I use the AEV Procal to set tire size(true measure at 34) and gear ratio(4.10) and driving on mostly flat North Dakota land.

In the warm summer temps I would avg about 16-17 and in temps down around the teens and single digits I would drop to about 14-15 or so. I had been down in the 14's before the change and the temps were pretty low single digits. Now the temp today was mid 30's and it was showing 19 MPG or a little over that.

I attribute this to minimal gains and more efficient burning of the fuel by new plugs, wires, and coil. I'm not saying I had the magnificent 4 MPG gain, but it's trending towards some slight improvement. I will continue to update this so that I can get a better overall avg of MPG and feel.

2007 JK Unlimited Sahara, Blacked Out
3.5 inch lift sitting on 35's
Poly Performance/Synergy Suspension Ball Joints
Smittybilt Oversized Tire Carrier
Butkus34 is offline  
post #6 of 8 Old 02-20-2012, 09:16 AM Thread Starter
Granite Guru
 
Butkus34's Avatar
 
Join Date: Aug 2010
Location: Adams, ND
Posts: 362
Feedback: 0 reviews

Ok, through a tank and a half and it is holding steady around 16 to 17 mpg's. Now that's close to what I would normally get in the summertime, but it's been much warmer than normal here.

Bottom line is I believe there is better start up, idling, and slight power and mpg improvement. I won't say it's anything drastic but I attribute it to the engine being more efficient with the new/clean plugs, wires, and coil. The older your stuff is the better the results are going to seem due to the plugs, wires, coil not being as effecient as when they are newer.

2007 JK Unlimited Sahara, Blacked Out
3.5 inch lift sitting on 35's
Poly Performance/Synergy Suspension Ball Joints
Smittybilt Oversized Tire Carrier
Butkus34 is offline  
post #7 of 8 Old 02-20-2012, 10:34 AM
JKO Addict!
 
TCdawg's Avatar
 
Join Date: Jan 2011
Location: Woodstock, Ga
Age: 50
Posts: 3,717
Garage
Feedback: 2 reviews

I've got 85,000 on my 2008, maybe it's time I replace plugs as well.

I get shit for gas mileage, 13.5/gallon, 35's, 5.38's, full size spare, 3.5" lift, no air dam and to top it off a Gobi roof rack. I'd love to get back to 15 mpg!!

TC
Crawling For Reid March 23, 2019 Adventure OffRoad Park


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
TCdawg is offline  
post #8 of 8 Old 02-20-2012, 02:12 PM Thread Starter
Granite Guru
 
Butkus34's Avatar
 
Join Date: Aug 2010
Location: Adams, ND
Posts: 362
Feedback: 0 reviews

That's babying it on the road, still drive 65 or so, but definitely lowers it when having fun with the throttle or taking some trails and crap.

2007 JK Unlimited Sahara, Blacked Out
3.5 inch lift sitting on 35's
Poly Performance/Synergy Suspension Ball Joints
Smittybilt Oversized Tire Carrier
Butkus34 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JKowners.com : Jeep Wrangler JK 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:
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:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome