I went to the %tps for WOT vs. rpm table I believe thats what its called and set the 0-1200 rpms at 0% tps and went I start the car it still goes into closed loop according to both datamaster and my A/F guage. Am I in the wrong table?

 

What you are doing is running the car in PE(power enrichment) mode... actually it only affects closed loop. So it sounds like you are on the right track. Did you make sure to freeze the BLMs at 128/128 so as to take care of the split? The program is called BLM blocker if you dont have it.

What is your AFR showing and what is the PE table value set at for 800-1200 rpm?

 

My datamaster shows the o2 mv jumping around and my a/f ratio guage starts bouncing around as well once the timer times out. I'm not sure which table is the PE table. I have the blm blocker but have not tried to use it. Yesterday was my first attemp at tuning and I've ben reading for months. Still trying to figure out what tables do what. Thanks

- should I be using pcm_ee or pcm_eeb. I cant remember which one is for 94 and earlier oBD1

 

I do not remember exactly which def. file you are supposed to use. Just ask TC.. theyd know best.

Definitely lock your BLMs. that will cure any idle BLM split you might have. The table you are supposed to make changes in is something like %change WOT vs. RPM. There is one just above it for coolant temp variations so read carefully and dont choose that table.

 

Where did this blm blocker program come from that can keep idle blms at 128? Did I miss this along the way?

 

There is a misconception that at WOT the car enters OPEN LOOP mode. This is untrue, it only ignores IMMEADIATE/CURRENT feedback from the O2 sensors. It will however remember the last BLM learn and adjust the LTFT while in PE mode to compensate for the target AFR. But you can curb this with the new LT1 Edit and Tunercat and LOCK the BLMs in PE mode.

 

Does this do the same thing as the program that I have that locks wide open throttle blms to 128?
I thought I had the newest definition file from TC...maybe I don't.

 

The latest def files for tunercat will lock the BLMs at WOT

however LT1_edit requires version 2.2

 

So what I'm really trying to do is run in PE mode at idle. I was reading the tuning closed loop idle thread since it started but no one really clarified that. Thanks Taz

 

OKay my % change to air/fuel ratio vs. RPM at WOT( PE table I assume) reads like this

400 -29.7
800 -25.0
1200 4.7

Like I wrote above my %TPS threshold for WOT VS. RPM ( low cool) is set to 0% tps for 0-1200 rpms and then stock the rest of the rpms. I am working off of a MAdz28 tune and just modifying it as I need to

 

well your half right, it doesnt lock them it limits them, so if you tell the stft to not go under 125 and not above 130. it will limit them in normal driving as well. meaning the car will not ever see anynthing outside those 2 numbers, no matter what happens.

now a person could lock the stft to 128 and lock the ltft to 128 and just use the pe tables for everything (daily driven included) and this would allow a open loop type tuning with the benifit of the use of pe tables with no corrections by the pcm

 

Yeah today I noticed my STFTs are moving just like they always have but my LTFTs are locked at 128/128.

I almost feel like buying a damn carb/intake after doing all this work for basically nothing. Why can't we just have a table for closed loop enable vs. RPM... it would make life so much easier.

 

Just lock up your LTFT's to 128 with locker. Set you STFT top limit to 135. and force "closed loop" PE idle with the TPS vs RPM table. Lean out the MAF or PE table at idle till your hearts content. STFT will shoot to 135 and hang there. As soon as you tap the throttle your out of PE and normal Closed Loop LTFT's will be learned. STFT's will always be limited by 135 so make sure your MAF cal is set up to be a shade rich during cruise conditions if anything. That way your STFT's will always be under 135 when cruising. It can work pretty well. I know it's a Rube Goldberg work around, be I believe that it's all we've got at the moment. The down side is that you may throw an O2 lean code if your doing a lean idle for a period of time. This is more a nusiance than anything. As soon as you blip the throttle it'll clear the code.

Also: I think Christian M actually wrote the original patch for BLM locker.

 

So does lowering these numbers take fuel out and raising them add fuel