Tuning help needed

[christer.medin at lennoxintl.com]

Thanks.  At the time, we had it set to stay in closed loop until 60% throttle, which we didn't get to at any point during the test drive.  We were going to try leaving it in open loop next to see if that makes a difference at all... trying to narrow down exactly _where_ it's having a fit.  Does the 4mv O2 reading make any sense? It seems odd that it'd drop like that within a second...

Christer

----------
From: 	MIME :realsquash at yahoo.com
Sent: 	Tuesday, June 15, 1999 11:01 AM
To: 	gmecm at efi332.eng.ohio-state.edu
Subject: 	Re: Tuning help needed

Check to see if it switches to open loop when you push
the gas.  Try just pushing the gas slowly, but all the
way to the floor.  Don't just mash the gas!.  If it
runs crummy this way, then add/remove fuel from the
main fuel table.

Squash

--- christer.medin at lennoxintl.com wrote:
> Hi, just subbed to this list -- I have a friend who
> just got his car together again, with a 379
> (de-stroked 400) SBC, TPI intake, and Haltech
> computer.  We finally took it for a spin yesterday,
> and it runs great until you push the gas a little
> extra; at 25%+ throttle and around 2000-2500 RPM, it
> stumbles _badly_.  The O2 readings are in the high
> 700s right before then, and vacuum is at around 24",
> but as soon as you step on it, the O2 reading drops
> to 4mv, and vacuum to 5-7".  If I were to wager a
> guess, I'd say it appears more related to a sudden
> stab at the throttle than the RPMs.  Right now
> timing is setup for 10 degrees initial, and 36
> degrees coming in full at 3K RPM.  Since you guys
> live and breathe ECMs, I was hoping you'd have some
> input here.. thanks!
> > Christer
> > > > _________________________________________________________
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