Iv got a 05 lly and i set table B0751 to 200 because i was told it makes a little more smoke.. when in neutral and i floor it from idle it smokes alot and then starts popping at about 2000-2300rpm. If i put in drive and accelerate from a stop hard it smokes alot and then clears up but it runs normal all the way through the rpm range and through all gears. The truck only has 5in exhaust and EGR blocker. Can anyone help with why it is doing this???

Should probably ask in the EFI Live forum, where more people will see this with the knowledge to answer.

Iv got a 05 lly and i set table B0751 to 200 because i was told it makes a little more smoke.. when in neutral and i floor it from idle it smokes alot and then starts popping at about 2000-2300rpm. If i put in drive and accelerate from a stop hard it smokes alot and then clears up but it runs normal all the way through the rpm range and through all gears. The truck only has 5in exhaust and EGR blocker. Can anyone help with why it is doing this???

Get yourself an EGT gauge and a boost gauge. Keep it under 1400 degrees. More fuel= hotter egt's. Add boost and the egt's will come down again. Please before you do anymore tuning to the truck, please please please get the gauges. If you don't, you could be melting pistons or cylinder heads before you even know it.

Hmmm....Good advise on the gauges, but for the wrong reason. The popping is probably not due to high EGTs. Especially if it is in neutral.;)

Buick455,

I would take a look at the timing. The stock tables were never meant to be run with full fuel and no boost. I would guess that is what is causing your popping.

Sounds to me like you are hitting the abuse management settings that limit theRPM's to 2200 when in neutral. Some tunes have a limiter in them and some don't. Maxxing out B0751 basically makes it so the tune no longer references the MAF sensor for fuel delivery. Basically you just removed the smoke control that GM built into them. Be careful as you can actually hydrolock the engine if your not careful with your tuning at low RPM's.

Hmmm....Good advise on the gauges, but for the wrong reason. The popping is probably not due to high EGTs. Especially if it is in neutral.;)

Buick455,

I would take a look at the timing. The stock tables were never meant to be run with full fuel and no boost. I would guess that is what is causing your popping.

No offense dude, but where did i say high egt= popping? If you were to think high egt caused popping you would also be wrong. The popping would probably cause high egt's, also timing, to much pulse width on the injector and the fuel is still burning in the exhaust? Who knows, I wouldn't be able to tell without being there and hooking up efi, or hpt and running a few logs.

No offense dude, but where did i say high egt= popping? If you were to think high egt caused popping you would also be wrong. The popping would probably cause high egt's, also timing, to much pulse width on the injector and the fuel is still burning in the exhaust? Who knows, I wouldn't be able to tell without being there and hooking up efi, or hpt and running a few logs.

Ummm...What?

His question is about a popping noise, and you replied with some stuff about "hotter egt's" and "please please please get the gauges". How was I not to assume that you were talking about high EGT's causing the popping. :confused::confused:

Was I the only one that connected those dots?

Best regards,
Dude

Was I the only one that connected those dots?


I didn't connect those dots myself, I just took it as somebody warning somebodyt that playing with tuning to make huge smoke could be dangerous and he needs to keep an eye on it to make sure doesn't melt it down.

Best regards,
Dude
__________________
Pat
'05 3500 LLY 4x4

Not gonna lie, that made my day! Good to see someone who doesn't take themselves too seriously.
I didn't connect those dots myself, I just took it as somebody warning somebodyt that playing with tuning to make huge smoke could be dangerous and he needs to keep an eye on it to make sure doesn't melt it down.
That's how I saw it. Although I can see what Pat was thinking too.

And "The Destroyer" was right on his advice: hold off on the tuning until you can see what it is doing to your engine. Smoke normally = heat, so be careful!

The ayes have it.

Destroyer, you have my apologies. I read too far into your response and ASSumed the wrong context. :beerchug:


Buick455, what's the good word?

well i put the table to stock right now because i was just fooling around with it. i havnt had much time to look into it further but i will let you know... Some one said something about 2200 limit in neutral? what is that all about?

well i put the table to stock right now because i was just fooling around with it. i havnt had much time to look into it further but i will let you know... Some one said something about 2200 limit in neutral? what is that all about?

Some ECM programs have a rev limiter for neutral, this is refferred to as abuse management so that you can't drop it into gear at WOT and cause MASSIVE drivetrain damage(IE neutral drops like so many like to do). I know that my 02 operating system stock would fall flat at 2200 if I was in neutral. EFILIVE doesn't show these tables for teh automatic, but does for the stick guys. I can send you the tables to up the B0751 table so as to get rid of most of your table lag without blacking things out.

Some ECM programs have a rev limiter for neutral, this is refferred to as abuse management so that you can't drop it into gear at WOT and cause MASSIVE drivetrain damage(IE neutral drops like so many like to do). I know that my 02 operating system stock would fall flat at 2200 if I was in neutral. EFILIVE doesn't show these tables for teh automatic, but does for the stick guys. I can send you the tables to up the B0751 table so as to get rid of most of your table lag without blacking things out.
Thanks that would be great. Sometimes if I just rev it in neutral or park it will redline and i have set it to 4000 before and it did rev to 4000?

Some ECM programs have a rev limiter for neutral, this is refferred to as abuse management so that you can't drop it into gear at WOT and cause MASSIVE drivetrain damage(IE neutral drops like so many like to do). I know that my 02 operating system stock would fall flat at 2200 if I was in neutral. EFILIVE doesn't show these tables for teh automatic, but does for the stick guys. I can send you the tables to up the B0751 table so as to get rid of most of your table lag without blacking things out.

Not to say this isn't the case but i have tuned a lot of LLYs all automatic and never had this problem unless pulse time was set to wide on a smoke tune to where the stock or possibly weak CP3 couldn't maintain rail pressure or there was so much fuel it caused the engine to miss. As far as the neutral rev limit i've only seen it in gas PCM's, but once again like the fermanator pointed out they are only shown in ZF6 models.

Another thing change your fuel filter if not changed recently as this will also cause your symptoms!

Good Luck!

The ayes have it.

Destroyer, you have my apologies. I read too far into your response and ASSumed the wrong context. :beerchug:


Buick455, what's the good word?

No problems here. Apology accepted. The good word today would be Mackeral. lol