[The Atomic Ass]

Originally Posted by LeanBurninating

Hmm...

So the way the revs fall is your only indication? What kind of truck is it? What motor? Year? How many miles?

S-10. 2.2L. 2001. Around 60K.

Originally Posted by LeanBurninating

Some motors just have so much rotating mass that it just takes them a long time to wind down. Take for example a traditional american v8. Because the way the crankshafts are designed, the crankshafts have very heavy counter weights to keep things balanced.. blah blah stuff like that.

Granted there are motors with less inertia, but key off from 3K RPM results in a stopped motor within 1.5 seconds. Return to idle from 3K results in minimum 5 secs.

Originally Posted by LeanBurninating

You may be right, but I would bet that it is not running excessively rich. There are other ways to tell. Check the spark plugs for one. Also, the factory "tune" on the truck may just work that way, it may just make the revs float when you back outta the throttle. Or maybe there is another problem.

I did neglect to mention this isn't a new issue, it's done this since it was purchased 4 years ago. Plugs/wires didn't affect it when replaced some time ago, and the plugs did not appear particularly out of line. I suspect it runs fairly close to proper while at speed, it's this closed throttle crap that really bugs me.

Originally Posted by LeanBurninating

As far as tuning goes, it sounds like you just need some basic starting point info. If you want all out complete adjustability of everything, then that is called a stand alone system. Its basically ripping out the entire factory computer system and replacing it with an aftermarket one. Race car stuff. Don't do that.

Couldn't afford to do that, anyway. The bare minimum I'm looking for in control is complete control over DFCO. I want the engine to PLUMMET as if it had run out of gas when letting off the throttle.

Originally Posted by LeanBurninating

Then there are what they call "piggy backs" where its basically some kind of module that either bolts up to the ecu or plugs into it somehow to reflash it.. etc.. Much cheaper and easier to work with, although in some cases less effective.

I'm hoping for something cheaper than Powertech, that would work for both the 2.2L and 4.3L, and not be restricted to one car per device.

Originally Posted by LeanBurninating

I think you may be asking a lot. Car makers dont build computers that you can "customize" ... you gotta find somebody that can crack em. Its tricky business, because if you do it wrong you can really screw stuff up. And it goes without saying, few aftermarket companys would spend time making a tuner for a car or truck that is not popular to modify for performance. And those tuners - which may be your only real option - are usually not specifically designed for fuel economy.

You'd think they'd see the EcoModder's knocking on their doors by now.

But anyway, have any of the tuning shops with the big expensive hardware seen the light yet that you know of?