I know I'm way behind on this tread, but I drive the same truck in the same
weather here. On your short trips in the "cold" it probably isn't warming
up enough. I don't think the 4.7L run nearly as hot as 5.9, 5.2, or even
3.9's. These engines can run cold all by themselves. I know my T'stat
works well but when I get on the highway in 40deg weather it will run well
below 180. Also I'd suggest resetting your computer right before you take a
long highway trip, that'll give it a better knowledge base. My milage has
dropped about 2-3mpg also, I blame the weather.
Jay W
4.7L Auto Sport+ C.C. 2wd Black
Mods Profile page at
http://www.twistedbits.net/WWWProfile/dakota/Re5X8z5la@Ix2/profile.htm
------------------------------
Date: Sun, 28 Jan 2001 09:43:55 -0800
From: "Ronald Wong" <ron-wong@home.com>
Subject: RE: DML: Gas mileage to crap?
That's "open loop". If that were the case it would throw a OBD-II code
(P1281). Our trucks are notorious for low mpg's....'cuz they're trucks. By
the way, Bill, from a performance standpoint, it's much better if you go
easy during the re-learn process.
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
For modifications see my DML Profile (URL follows)
http://www.twistedbits.net/WWWProfile/dakota/Kw9pV1EkFeOYY
- -----Original Message-----
From: owner-dakota-truck@BUFFNET.NET
[mailto:owner-dakota-truck@BUFFNET.NET]On Behalf Of Doug Fedeli
Sent: Sunday, January 28, 2001 12:28 PM
To: dakota-truck-moderator@bent.twistedbits.net
Subject: Re: DML: Gas mileage to crap?
Just a guess but it sounds like the truck is never warming up enough. The
comp
is never getting out of closed loop mode.
Doug Fedeli
"William H. Hiatt III" wrote:
> Well, I got a 2k 4.7l w/ auto, and am only getting about 9.5MPG. I will
> admit, the computer, when I had to drive to have it relearn, I did drive
> very heavy footed, and I do drive lead footed sometimes. Most of my
driving
> is just short trips, 5-6 miles. What's up here. I am a little lead footed,
> but that much. It has been around 50 degrees here lately too. Any ideas?
> Should I run fuel injector cleaner, or fuel system cleaner? What's the
> difference? I usually prefer the STP stuff.
>
> william
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 11:58:49 EDT