The Test

***88Racing*** · #1 Tue, June 23rd, 2009, 08:19 AM

Something else I noticed. Under heavy acceleration the economy goes up by .4-3.0 mpg. This is happening in both custom tunes. In stock its just the opposite.

Lars

***Jackpine*** · #2 Tue, June 23rd, 2009, 12:41 PM

Quote:

Originally Posted by 88Racing

Something else I noticed. Under heavy acceleration the economy goes up by .4-3.0 mpg. This is happening in both custom tunes. In stock its just the opposite.

Lars

Good grief! That makes no sense at all! You're talking about instantaneous economy, right? I know when I monitored mine (for a short time), anytime I stepped on the gas, it dropped and when I backed off, it went up.

Your PCM sounds really confused.

- Jack

***88Racing*** · #3 Tue, June 23rd, 2009, 01:35 PM

Jack
If you go and look for it over on f150online there used used to be a similar problem with the canned tunes. Some of the posting was done by none other than ASEmechanic aka Bill. So hopefully by him reading these posts he is getting a clue what's going on?

Lars

***Jackpine*** · #4 Tue, June 23rd, 2009, 01:56 PM

I remember a tranny shudder problem that was cured by a firmware update to the Edge, but not the fuel economy going the wrong way. I can't think of a suitable search string other than "tranny shudder" (which people often misspelled "tranny shutter"), and that's giving me more hits than I care to wade through.

But you're right, if this is related, I'm sure Bill will know how to fix it.

- Jack

***88Racing*** · #5 Tue, June 23rd, 2009, 02:23 PM

I have found it once before and I will find it again!

Lars

BlackSTX · #6 Tue, June 23rd, 2009, 05:26 PM

No kidding, sound like something is reacting the opposite as it should be. If only you could get more economy by stepping down on it....I'd never have to stop for gas! Forget a hybrid, buy a big block!