while I'm cruising if I let off my gas from about 45mph and coast on down it leans out.
It's reading about 50-150mV.

do I need to change the maf tables to correct this condition..

 

Lean decel mode, I believe, for economy/smog concerns... should be ok.

 

I think that it also prevents the Pop Pop Pop that you can get through the exh when you are decelerating.

BW

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Bobalos
aka Bob W.
www.r71camaro.homestead.com
r71chevy@earthlink.net
<><

 

DFCO
Deccleration Fuel Cut Off

It's a mileage thing
Depending on cal., there maybe maybe parameters to change that if you want, but for other then anti-lag with a turbo no real reason. Often a stall can occur for a high dec., without DFCO.

What you wan to do IMO, is drop the timing way down during over run. ie 30 K/Pa, and then have your regular cruise timing start at 40.

 

It's amazing how when I first saw all this it looked like Japanese.
What can I say... after a while I may be able to read Japanese... lol
thanks again guys

 

In other words, what you see is completely normal. The computer cuts the fuel when you're decelerating, because you dont need fuel to slow down. Its a mileage and smog thing.

------------------
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

If you turn your radio to AM and get it to the right Frq. you can hear the computer shut down the injectors on a down hill coast Its kinda neat plus you start to feel it when they shut down when you know what it feels like just a little FYI

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Ya sure it is just an RS

B4Cyaa

1991 RS B4C
Former Nebraska Highway Patrol Car
305 TPI
WC T-5
Four Wheel Disk Brakes
Only Options
Rear Defrost
Am-Fm Radio
Red-int White-exe
One BA Of A 350 In The Works
Mods
Dynomax Cat Back (to hold me over till I got the $$$ for the Borla)
best 1/4mile Run of 14.92@94.83
with 145,000 on her
god speed dale

[This message has been edited by 91B4C jacob (edited May 23, 2001).]