PROBLEM SOLVED!!!


Contact Tunercat and download the new $EE definition file that now enables you to change "Minimum Injector Pulse Width" constant.
- go to page 2 for details


Hi Guys,

xxsaint69x and I have the same, very strange and very annoying problem, and we would be more than glad to have a solution for it.

Basically, at idle, the car enters closed loop, but seems to ignore O2 feedback, BLMs and INTs are stuck at 128/128, in cell 16.

O2s show a steady .900mV, are not bouncing which is backed up by the WBO2 measuring 12.0 AFR. When blipping the throttle, the car goes to the corresponding cell, and seems to correct the integrators… So this problem is only present at idle.

Right click and save my Datamaster log:

www.hungryta.com/blm128.zip

I have this problem since I fired up my new single turbo setup, I have #83 Siemens-Deka injectors driven by a Acceleronics Versafueler, a stock PCM, stock MAF, etc.

So far, I have replaced both O2 sensors with new ACDelco ones, loaded different tunes, with different definition files, even the stock tune (only change was injector constant set for the 83 pound squirters), checked grounds, without any success.

Who else does have this problem?

Looking forward to your comments, ideas.

p.s. I have posted this in both ‘Programming’ and FI forums, as I think this problem *might* have something to do with FI/big injectors.

 

First thing to do since the O2's are stuck nearly maxed out is force them to read low. Disconnect them and short the tan, purple and black wires together. The O2s should then be reading less than 200 mv. If they do not, the wires are cut/burned or otherwise have a contact problem.

 

there is nothing wrong with wires..i have the same problem

 

I have checked the O2 circuit with an ohmmeter, everything's OK.

 

xxsaint69x, what kind of injectors are you using? low/highZ? impedance converter?

 

Are the sensors in front of the turbo or after the turbo?

 

The stock O2s are in front of the turbo, the WBO2 sensor is in the downpipe 5" from the turbine discharge.

 

Then why is this?



Either the wires/contacts are screwed up, the O2's are screwed up or your PCM is dust. Or the vehicle is actually running pig rich. So which is it?

Why don't you put the jumpers in the O2 connectors to see what the PCM does. Then (if you feel the wires are good), if it still reads high, you know the PCM is fried.

 

Because it runs at 12.0 AFR, pig rich! If you stomp on a stock LT1, it'll enter PE mode at WOT and you'll see the same steady 900-850mV. But it should not do it at idle!

But to answer your question, I have removed the v-band clamps, causing a false lean condition, and the O2s were jumping around like normal from the excess fresh air in the exhaust, WBO2 showed 15.7 AFR, but the BLMs were still stuck at 128/128.

 

Here it is in my original post, it does run pig rich!

 

did u hear anything back from versafuler? i am guessin it has to do with the way it runs the injectors...i am runing same set up as you, but 96lb injectors

 

Do you have a .LT1 file or .BIN file from the tune to look at? It's almost like you have a BLM locker, but at idle.

Dan

 

it does it even with a STOCK file..the only thing i changed on mine was the injector constant and let me car idle and the bLMS wouldnt never move.

 

Same here with the stock file.

Marcin! What are your INJ BPWs showing? I have 1.0, look what Jeff @ Acceleronics had to say about it:

I have the stock FPR, what about you?

 

What Jeff is saying makes sense. Are 96 lb injectors required for the HP you are putting out?

Hungary, what size injectors are you running?

Dan