I'd start checking sensors, starting with O2 and IAT.
Jeff Durling wrote on Wednesday 13 June 2001 11:03 pm:
> 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 0x1.f727070616e55p+871ccurate 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+
>
>
-- -andyhttp://home.twcny.rr.com/andylevy/ --- andylevy@yahoo.com ------------------------------------------------------------- modesty, n.: Being comfortable that others will discover your greatness -------------------------------------------------------------
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