BLMs=105

[REGL8R]

Hey, my car seems to be running pretty good for the most part now that I have it back together except for knocking at what I feel is a pretty low boost level (14 Psi). I have been trying to cure this low Blm problem for a while, here is my situation...

Start the car and it runs perfect while it is cold, Blms and Int are pegged at 128. As soon as the car warms up it gets a little rougher and seems to search for an idle. I notice once I pass 155 coolant temp on the SM the BLMs start to fall and do not stop until they get pegged at 105. I have a LT1 maf and trans (not plus), new o2, swapped ecms didnt do anything.

Anyone have an idea?

 

[2QUIK6]

Sounds to me like maybe your translator may not be setup right, there is a pod in the translator box that will control idle fueling. BLM=105 indicates it is very rich and needs fuel removed.

Other things may include a stuck injector open, incorrect chip for the size injectors you have.

When did this problem start occurring?

 

[REGL8R]

Well I just got the engine back in the car a few months ago and it has been like this ever since I got my scan tool around 2 months ago just cant seem to track the problem. Can I adjust base MAF on the translator to fix this or is that just a band aid?

 

[wiked87gn]

set translater to 10% rich at idle that should put you right around where u need to be.

 

[2QUIK6]

You need to pop the cover off the translator box and see where the setting are now. I don't consider this a "band aid" fix, all are a little different, so you adjust the setting where you car and current chip like them best. Need to turn the base setting down (more lean) at least one notch and see how that changes things, then go from there, maybe need to turn it down another notch after that. Without knowing where its currently set at, setting it at 10% rich per above may make it ever more rich.

What this controls is the MAF counts that are sent to the ECM for air measurement. By turning the fuel pods it is faking out the ECM by either sending the ECM more or less counts for the given amount of air measured by the MAF. The ECM them converts these counts into measurements of air based on the MAF tables stored in your chip. Another way to adjust this is to readjust the MAF tables in the chip, so adjusting the pods in the translator is much easier, and also gives you another way to adjust fueling when at the track or running more boost.

 

[wiked87gn]

my bet as 2quick6 said you have to make it lean go lean and not rich that was my mistake, lower blms means the ecu is taking fuel out because its running too rich higher blm's the car is dumping fuel due to lack of it.

wikedgn

 

[2QUIK6]

You mention its been this way since you got the engine put back in. What all did you do to the engine? Bigger fuel injectors, different cam etc....all of which will effect A/F ratios, and a custom chip for the combination would be in order. If you changed injectors but did not change the chip parms...then yes, the translator settings are a band-aid fix in that case, and not getting a new chip for the combo is the cause of your BLM issues.