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MarkL
Dodge Dakota
JOIN HERE
6/12/2003
00:16:45
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 Subject: Imroved mpg on 4.7l
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Message:
I thought I was seeing things, but I went from a consistent mpg in the low 14's to upper 15's. I've owned my 02 QC since new, and have checked mpg on every fill up. It always hangs @ 14.2-14.5 until I took it in for the 15k service at the dealer. The service included cleaning/adjusting the trottle body which I nearly didn't do but was convinced to by my servive advisor. Ever since, with no change in driving habits, I'm easily getting high 15's now. I'm not sure what all is involved with this throttle body adjustment, but for those of you looking to improve your milage, this may be a good place to start.
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BigBlue QC
GenIII
6/12/2003
08:08:07
|  RE: Imroved mpg on 4.7l
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Message:
I am pretty sure there is no adj. on the throttle body, they just put an agressive cleaner down the throat of the throttle body to clean the butterfly and throat of any carbon buildup. I had the BG throttle body clean done at 30000 miles and personally didn't see much of a difference (probably because I have put AMSOIL PI cleaner in the gas every 3000 miles) but after seeing that all they did was spray the BG cleaner down the throat under pressure, I did it myself at 60000 miles with spray Gumout for fuel injected cars, might have worked even better, but good chance it could have been my imagination.
2002 QC 4x4 Sport Plus, 4.7L, auto, Patriot Blue, Tire & Handling group,
Heavy Duty Service group, Leer cap w/out windows, Mopar Step bars and roof rack, Rhino liner in bed and on step bars, Pace Edwards Power Tailgate lock
3.55 rear, 4-wheel anti-lock brakes, all possible fluids are AMSOIL
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01Motorsport
Dodge Dakota
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6/12/2003
20:44:07
| RE: Imroved mpg on 4.7l
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Message:
One trick that my favorite Mopar mechanic told me was to spray the carb/tb cleaner on the throat, then stretch a light rag, like an old t-shirt, over your index finger, and swab the inside of the throttle body as far as you can reach while holding the butterfly open. You won't believe how much you can remove that the spray cleaner alone misses. I do this about every 20,000 miles.
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markl
Dodge Dakota
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6/15/2003
07:11:32
| RE: Imroved mpg on 4.7l
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Message:
Great points about cleaning. The thing is, I bought my truck NEW and my milage hasn't varied more than 1/2 mpg until this service was done. Now it's up 1 to 1 1/2 mpg. It doesn't seem like much, but now I fill up @ 350 miles/tank as opposed to @300.
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buford
Dodge Dakota
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6/19/2003
16:12:41
| RE: Imroved mpg on 4.7l
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Message:
does anybody know how to adjust the TB?
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JasonB
Dodge Dakota
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6/19/2003
16:44:53
| RE: Imroved mpg on 4.7l
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Message:
Be careful with throttle body adjustments. Often, tampering with a throttle body is similar to tampering with a cat. converter...the EPA does not like that idea.
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Demon Dakota
DakotaEnthusiast
6/19/2003
18:05:15
| RE: Imroved mpg on 4.7l
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Message:
You can't adjust the 4.7L TB (unless you consider opening it up/boring it out an adjustment).
K&N Drop in AF (CAI during summer months)
True Dual exhaust and removed third cat
HO Cams & HO Intake
FASTMAN 70mm TB
Autolite 3923 Plugs
TPS @ .76 VDC
IAT Adjuster Mod
14.52@94.2 MPH at Silver Dollar Raceway
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Daksmack
Dodge Dakota
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6/19/2003
19:49:10
| RE: Imroved mpg on 4.7l
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Message:
Then I "adjusted" mine 3 weeks ago. Dremel beats the hell outta TB cleaner.
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Kowalski
Dodge Dakota
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6/20/2003
16:21:20
| RE: Imroved mpg on 4.7l
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Message:
There is also an idle speed adjstment on it, but I wouldn't think it would have much effect on mpg - remember, this is where the engine gets its air from, not the fuel, so no lean or rich adjustments here.
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Daksmack
Dodge Dakota
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6/20/2003
18:22:03
| RE: Imroved mpg on 4.7l
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Message:
Is he refering to the throttle possitioning switch? If so, all it does is tell the pcm where the throttle starts. Its like a carb linkage but with wire signals instead of linkage.
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DW
Dodge Dakota
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6/20/2003
19:37:38
| RE: Imroved mpg on 4.7l
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Message:
Mileage a month age was about 17-18 highway. Just went through and performed some minor tuneup stuff, changed plugs, cleaned K&N and throttle body. I also when through and changed oil, ATF, gear lube and brake fluid to synthetics.
Topped off the truck this morning and hit the road. When I filled it back up for the trip home the trip meter read 199.6 miles and the gas pump read 10.02 gallons. Thats almost 20 MPG. Guess the tune up and synthetisc are going to pay for themselves.
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