Forced PE

[Watazz]

Re: Forced PE

Does anyone know if it's okay to run 17 afr at cruise. Didnt european cars have a lean cruise for fuel economy?

[ssms5411]

Re: Forced PE

17 at cruise is high, if your on the pedal esp.,depending if its a auto you need a 14.7. Exhaust leak can cause the wideband to be thrown off too.

[Watazz]

Re: Forced PE

Usually just on cruise control is it that lean. But I get no knock and i've just recently fixed all off my leaks. If there is no kr is it really an issue??

[Watazz]

Re: Forced PE

As soon as I touch the gas fron17 it goes to around 14.7

[ssms5411]

Re: Forced PE

Its probably fine since its on cruise control and you have had the scanner on it,

[Watazz]

Re: Forced PE

I would rhink so. Hell maybe ill get some better mileage???? Maybe

[bigairboarder44]

Re: Forced PE

Here's a little chart, if you will, on AFR:

9.0:1 - Black Smoke (No Power)

11.5:1 - Rich Best Torque @ WOT

12.2:1 - Safe Best Power @ WOT

13.3:1 - Lean Best Torque @ WOT

14.6:1 - Stoichiometric AFR (Chemically Correct)

15.5:1 - Lean Cruise

16.5:1 - Best Fuel Economy

18.0:1 - Carbureted Lean Limit

22.0:1 - EFI Lean Limit

[Watazz]

Re: Forced PE

Im not sure I can run open loop. My idle is fairly rich (13.5) and nothing I have dont has leaned it out. Ive tried messing with my ve(which I'm not sure even kicks in until the maf fails), my injector table, idle. The only thing I havent messed with is my maf table and I have no idea what I should change. For idle I would assume a lower number from 3000-5000 hz for idle and cruise (1500rpm)

[97rs4life]

Re: Forced PE

change your maf table, you gotta log a cruise and see where you are on the maf numbers and your a/f ratio at those numbers, then tweak them to bring the a/f ratio closer to 14.7 at those maf numbers

[bigbrian442]

Re: Forced PE

Anytime you change something that effects the power of the motor you need to tune the MAF table.

[Watazz]

Re: Forced PE

Does anyone recall what the code for the rear o2 is??
Is it p0140?

[Watazz]

Re: Forced PE

change your maf table, you gotta log a cruise and see where you are on the maf numbers and your a/f ratio at those numbers, then tweak them to bring the a/f ratio closer to 14.7 at those maf numbers

What histogram do I need to use?

[97rs4life]

Re: Forced PE

watch the maf fz so you know where you cruise at

[Blizzard242]

Re: Forced PE

A little bit of an easier way to do that is to setup a maf error% histogram. The only pain is setting up the histogram correctly. I for some reason cannot find the how-to instructions on HP tuners website. Anyone know where they're at?

[Watazz]

Re: Forced PE

for some reason I caint use any Maf histograms, Not even Hz, its almost as if my car doesnt even have a MAF sensor. This is really starting to frustrate me because I used Bill@hptuners configs and I still caint use them. It says the car is not equiped with the necessary parameters. heres the link, first post http://www.hptuners.com/forum/showth...=MAF+histogram