MAFT Changes Get Learned Out?
Thread Starter
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11
MAFT Changes Get Learned Out?
I have heard rumors of the MAFT settings getting learned out by the PCM trying to correct for the changed made by it. This theory seems sound since the PE VS: RPM table is not edited directly I could see the PCM trying to richen the mixture up if I had leaned it out with the MAFT. The only thing that I can see that would keep it from being able to do this would be the lockout of the LTFT's during PE mode. Taking that into consideration is it only the non-WOT setting that can get learned out?
Racer
Joined: Jun 2002
Posts: 439
Likes: 0
From: Framingham MA
Re: MAFT Changes Get Learned Out? (5 Liter Eater)
I have heard rumors of the MAFT settings getting learned out by the PCM trying to correct for the changed made by it. This theory seems sound since the PE VS: RPM table is not edited directly I could see the PCM trying to richen the mixture up if I had leaned it out with the MAFT. The only thing that I can see that would keep it from being able to do this would be the lockout of the LTFT's during PE mode. Taking that into consideration is it only the non-WOT setting that can get learned out?
Presumably, the car could correct itself (within limits and over time) for this supposed "too low" air flow signal, but I think this is probably a better way to go for the small investment of an MAFT.
Monk :flag :flag :flag
Le Mans Master
Joined: Apr 1999
Posts: 7,820
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From: Burlington ON
Cruise-In I, II, III, IV & V Veteran
CI-I & II Auto-X Champ
Re: MAFT Changes Get Learned Out? (Monk)
Part throttle (BASE) changes by a MAFT get learned out. However, WOT changes do not because the 02 sensor values at WOT are not used by the PCM to make any changes during PE/WOT mode.
