Jeep Garage  - Jeep Forum

Jeep Garage - Jeep Forum (http://www.jeepgarage.org/forums.php)
-   Engine Performance/Intake/Exhaust (http://www.jeepgarage.org/f183/)
-   -   2009 5.7L Hemi - Suggestions for Better Fuel Economy?? (http://www.jeepgarage.org/f183/2009-5-7l-hemi-suggestions-for-better-fuel-economy-38801.html)

mlsmith3344 03-12-2012 02:55 PM

2009 5.7L Hemi - Suggestions for Better Fuel Economy??
 
Does anyone have any suggestions on how to get better Fuel Economy in my 2009 WK 5.7L Hemi. I only average about 14 MPG right now... sticker said 17-21 when I bought it... so not true. :confused: I am very open to any suggestions anyone may have... or have tried. Thanks!

2009 Grand Cherokee Overland with AWD Quadra-Drive II

08Hemi 03-12-2012 03:32 PM

Re: 2009 5.7L Hemi - Suggestions for Better Fuel Economy??
 
Clean your throttle body (you will be amazed what is inside and on the blade); VERY light alcohol and clean towel as we have electronic TB's
Do the TB ground mod (idk if this helps mpg's, but it def helped TB responsiveness)
Seafoam your intake and fuel system
Get a catch can

Those three things (TB ground idk) really helped me when mine started to get into the low teen's around town, now i'm back to my 14.5-16...and 19.5-21 on the highway (but I do have a 2wd so that helps)

Also check your PCV valve; I have not done anything to mine but I have heard that can be a possible culprit too

amw5 03-12-2012 03:43 PM

Re: 2009 5.7L Hemi - Suggestions for Better Fuel Economy??
 
Keep your foot off the gas pedal;)

Rob07WK 03-28-2012 09:25 AM

Re: 2009 5.7L Hemi - Suggestions for Better Fuel Economy??
 
Quote:

Originally Posted by 08Hemi (Post 592119)
Do the TB ground mod (idk if this helps mpg's, but it def helped TB responsiveness)

What is the throttle body ground mod? I tried a search but didn't find this info.

Hemi24 03-28-2012 11:21 AM

Re: 2009 5.7L Hemi - Suggestions for Better Fuel Economy??
 
Quote:

Originally Posted by Rob07WK (Post 602287)
What is the throttle body ground mod? I tried a search but didn't find this info.

This was in Omelet's Build Thread:
In case anyone cares, this is how I routed my TB ground wire. I used the lower driver side bolt and ran the wire up the back of the TB, then along the wire harness to the fender.

http://i595.photobucket.com/albums/t...n/6d29ab56.jpg

http://i595.photobucket.com/albums/t...n/b4172c7c.jpg

HemiDawg 03-28-2012 02:39 PM

Re: 2009 5.7L Hemi - Suggestions for Better Fuel Economy??
 
Quote:

Originally Posted by 08Hemi (Post 592119)
Clean your throttle body (you will be amazed what is inside and on the blade); VERY light alcohol and clean towel as we have electronic TB's
Do the TB ground mod (idk if this helps mpg's, but it def helped TB responsiveness)
Seafoam your intake and fuel system
Get a catch can

Those three things (TB ground idk) really helped me when mine started to get into the low teen's around town, now i'm back to my 14.5-16...and 19.5-21 on the highway (but I do have a 2wd so that helps)

Also check your PCV valve; I have not done anything to mine but I have heard that can be a possible culprit too

How many miles did you have on the GC when you did the cleanup?

nyc_medic 03-28-2012 02:44 PM

Re: 2009 5.7L Hemi - Suggestions for Better Fuel Economy??
 
Sorry to hi-jack, but what does grounding the throttle body due?

JeepCoop 03-28-2012 03:39 PM

The TB doesn't have enough good metal contact to ground it. When you properly ground it, it operates much better and is way more responsive :thumbsup:

Rob07WK 03-28-2012 06:27 PM

Re: 2009 5.7L Hemi - Suggestions for Better Fuel Economy??
 
Quote:

Originally Posted by JeepCoop (Post 602546)
The TB doesn't have enough good metal contact to ground it. When you properly ground it, it operates much better and is way more responsive :thumbsup:

Cool, I'll have to put this on my growing list.:thumbsup:

nyc_medic 03-28-2012 07:50 PM

Re: 2009 5.7L Hemi - Suggestions for Better Fuel Economy??
 
Thanks JeepCoop

08Hemi 03-28-2012 08:00 PM

Re: 2009 5.7L Hemi - Suggestions for Better Fuel Economy??
 
Quote:

Originally Posted by HemiDawg (Post 602484)
How many miles did you have on the GC when you did the cleanup?

under 20k...my TB was FILTHY!! I couldn't believe it :eek:

zero_psi 04-09-2012 12:07 AM

Re: 2009 5.7L Hemi - Suggestions for Better Fuel Economy??
 
53k and my tb was clean as a whistle i was like "hum":confused:


All times are GMT -5. The time now is 09:36 PM.

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