When adjusting MAFT for LTFT do you have to reset the PCM each time you adjus the MAFT. Let me know what you think.

Tom

 

No you don't.You will need to drive for about an hour inbetween settings for the computer to learn itself.

 

An hour so wouldn't it be easier to reset it?

Let me know.

Tom

 

If you make a one click change on the MAFT to the base setting, no PCM reset would be helpful.

Any number of clicks to the WOT setting does not need a PCM reset. A change to the WOT setting probably has no learning associated with it so you should get an immediate response from the engine at WOT.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by BlackWS6LS1:
<strong>An hour so wouldn't it be easier to reset it?

Let me know.

</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">If you reset the PCM, you would have to drive around for an hour, since fuel trims are a learned parm.

 

Either way its a hours wait. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Tom

 

Keep in mind when you yank power from PCM
OR delete DTCs you force all I/M 240 tests back to non complete state and force the cpu of PCM to take process time away from other functions to now do those tests over where some I/M tests can take as many as 40 drive cycles to get back to a completed state.

There is no real positive to yanking power for a MAFT change, just do the 1 hour engine run time before making any further tuning judgements.