I have a the 165 ecm and using TunerPro and the problem is I have black smoke at WOT. I can't quite figure out how to correct this problem. The fuel pressure is at 44psi and I didn't want to lower that any really because it runs ok.

Anyways, after reading and all do I just adjust the table called "Open Loop AFR % Change Vs. LV8"? Right now on that table it looks like a 10.94:1 AFR if I'm reading and understanding it right. Is it really as simple as rasing that number? I thought that in closed loop/WOT the ECM did not know the AFR and you had to measure it with a WB? But even then, the only way I see to adjust at WOT is this "Open Loop AFR" table? If I can just lean it out enough at WOT to get rid of this black smoke then I'll be happy until I get a WB. How should I attack leaning it out a bit at WOT?

 

I wouldnt use the open loop tables to fix your problem. Unless you are totally running in open loop, IE you have disabled closed loop altogether.

There are 2 WOT %change to F/A ratio tables you shold be looking at. One is based on rpm, and the other is based on coolant temp. Togethor they modify your stoic ratio to what you want at 14.7. But the math isn't that simple. You will have to do some more reading on that.

If you are in closed loop, and hit WOT, you will still be in closed loop, just that learn control is off, and the ecm ignores the O2 sensor, then just goes by the tables for WOT.

HTH,

 

There are no WOT tables in TunerPro that I can see. I'm assuming you use the tables for open loop to adjust WOT. Is that the right?

 

It's called PE or Power Enrichment in my .ecu file - using 6Ev011 from Mangus' site. It starts at 50C and 515. Have you looked at your BLM's (block learn multipliers)? I'd bet they are at or near 108. I don't think block learn values below 128 are applied in power enrichment - meaning that if they are 108, they will be swithced to 128 while in PE only. This can add another 16% or so, above the already rich stock tune.

I'd have to recommend getting the block learn in line before reducing PE too much. This is usually done with the injector constants to get *most* of the blocks to near 128 ish. Then, the power enrichment will be more accurate as to what it will do.

But, if everything is working right, you may have another problem.