mileage problems

From: Jeff Durling (jdurling@mindspring.com)
Date: Wed Jun 13 2001 - 22:36:55 EDT


We'll it's been about a 2 months now and I still cannot get my mileage
problem resolved as well as the clunking in my front end but that's
another story. I used to consistently get 14-15mpg around town but once
it hit 9k that dropped to 11-12 mpg around town. Two tankfulls ago I got
my worst of 11.2 mpg around town. I am going to clean the throttle body
this weekend to see if that helps. I currently have a k&n drop-in filter
while waiting for the gen II to come out for the 4.7. The engine runs
smooth and the problem that ti had with the drop to almost stalling
(only happened twice that I can remember) has never happened since. Not
to hide this problem but the dealer did reflash my pcm at the same time
as my mileage problem (i figure it's almost definitely related) due to
there was a communication problem between the pcm and sensors, but they
insisted that it would absolutely have no effect on the operation or
performance of my engine. Of course I have had it back at the dealer for
this and they insist that I changed my driving habits (yeah right, one
tankful to another I completely decided to drive my truck different) and
I needed to try other gas. I did that and it didn't even make a
difference. If I watch the overhead computer, even though it's not a
100% accurate guide, it shows I good good economy while driving down the
road but I get really poor economy while accelerating off the line. I
used to get about 7-8 mpg while going off the line but now get 1-2 mpg.
Of course this can change with how hard I come off but under normal
acceleration is what I am describing here. My neighbor works as a
mechanic at a dodge dealership that i haven't been using and I am going
to make arrangements for him to have a look at it at work. He just has
to get the service manager to let him schedule it as his vehicle to work
on. Anyway, does anybody have any ideas where I my be able to find What
might be doing this. It was doing it before the k&n drop-in and I don't
have a cat-back yet but didn't know what else any of you guys thought it
may be. Sorry for such a long post but this is starting to really annoy
me.

Jeff Durling
'01 4x2 QC SLT+



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