even if i pull fuel, the trims read the same in this area.... - LS1TECH

Log In 


PCM Diagnostics & Tuning HP Tuners | AutoTap | Diablo | MAF Translator | HPP3 | FAST | Gen7 | Big Stuff 3
Sponsored by:
Sponsored by:

even if i pull fuel, the trims read the same in this area....

Reply
 
Thread Tools Search this Thread
Old 10-08-2005, 11:01 AM   #1
TECH Senior Member
Thread Starter
iTrader: (31)
 
WS6FirebirdTA00's Avatar
 
Join Date: Mar 2003
Location: North Carolina
Posts: 8,264
Default even if i pull fuel, the trims read the same in this area....

i posted a while back about this. here is the deal. on decel (dfco is disabled) the trims go way negative on my every time i log no matter how much fuel i pull in the ve. ok now i went to the ve and smoothed it out and almost doubled the numbers in the upper left corner, went out for a ride and the trims were -15ish. well with all that fuel taken back out, the trims still are at -15ish. im just afraid to pull out too much fuel in this area and cause issues. with fuel taken out my numbers are in the teens and 20's. can someone comment on this and let me know? thanks
WS6FirebirdTA00 is offline   Reply With Quote
Old 10-08-2005, 04:18 PM   #2
On The Tree
 
Join Date: Sep 2004
Location: St. Clair
Posts: 143
Default

Doesn't increasing the VE values add more fuel, because the PCM thinks you are getting a greater percentage of cylinder fill...

Remember too, that if you are using the MAS, it too plays a part in determining the amount of fuel to add...

Peace...Gman
Gman2002Z06 is offline   Reply With Quote
Old 10-08-2005, 05:47 PM   #3
TECH Senior Member
Thread Starter
iTrader: (31)
 
WS6FirebirdTA00's Avatar
 
Join Date: Mar 2003
Location: North Carolina
Posts: 8,264
Default

i dont have MAF just SD, yea increasing VE makes it rich, did i say that wrong? either way the trims go way negative....every time even after i pull fuel, so it SHOULD get leaner not stay rich
WS6FirebirdTA00 is offline   Reply With Quote
Old 10-08-2005, 08:44 PM   #4
TECH Fanatic
iTrader: (35)
 
bowtieman81's Avatar
 
Join Date: Sep 2004
Location: Maryland/Illinois
Posts: 1,660
Default

First, does the computer run off some of the idler functions on decel with throttel closed?

Also, with DFCO disabled, do the injectors reach the minimum pulse width on decel?
bowtieman81 is offline   Reply With Quote
Old 10-08-2005, 09:05 PM   #5
TECH Senior Member
Thread Starter
iTrader: (31)
 
WS6FirebirdTA00's Avatar
 
Join Date: Mar 2003
Location: North Carolina
Posts: 8,264
Default

ill check the log and let you knwo
WS6FirebirdTA00 is offline   Reply With Quote
Old 10-10-2005, 03:51 PM   #6
Teching In
 
Join Date: Sep 2004
Posts: 19
Default

If I remember correctly, deceleration "generally" maps to FTC 21. Here is my opinion (your original post sparked me to study this):

The values for FTC 20, 21, and 22 are learned between the time when car first goes into open loop and the evap begins to purge (or is done purging, I can't remember off the top of my head -- but regardless it happens shortly after starting the car). Once they are learned, it locks for the duration. Thus, the VE cells that the car is in during your deceleration are NOT the sames ones that FTC 21 was learned in. I would look in your log to see what VE cells they are actually learning in and change those to affect your decel issue.

John.
DellZ06 is offline   Reply With Quote
Old 10-10-2005, 04:04 PM   #7
TECH Senior Member
Thread Starter
iTrader: (31)
 
WS6FirebirdTA00's Avatar
 
Join Date: Mar 2003
Location: North Carolina
Posts: 8,264
Default

thanks man im gonna check it now and ill post back
WS6FirebirdTA00 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



All times are GMT -5. The time now is 08:08 AM.