Computer Diagnostics and Tuning Technical discussion on diagnostics and programming of the F-body computers

BLMs at 160 all the time?

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Old Apr 17, 2005 | 09:36 PM
  #1  
ftransam1's Avatar
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BLMs at 160 all the time?

My Blm's are at 160 all the time. Why is this and can someone tell me more of what that means? One of my friends tells me that's not good
Old Apr 17, 2005 | 09:51 PM
  #2  
Alvin@pcmforless.com's Avatar
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Re: BLMs at 160 all the time?

It means that the car is so lean that it can't compensate anymore.

What have you done to it?
Old Apr 18, 2005 | 07:31 AM
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Re: BLMs at 160 all the time?

Originally Posted by ftransam1
My Blm's are at 160 all the time. Why is this and can someone tell me more of what that means? One of my friends tells me that's not good

YOUR FRIEND IS RIGHT.

you need the thick of what you did to it last that would make it go lean
Old Apr 18, 2005 | 10:34 AM
  #4  
ftransam1's Avatar
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Re: BLMs at 160 all the time?

I haven't done anything to it recently. I am having a problem getting it started. I have to prime it once or twice before it just starts right up. Maybe the fuel pump?
Old Apr 18, 2005 | 10:36 AM
  #5  
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Re: BLMs at 160 all the time?

change the fuel filter and see what happens, if that helps get ready to replace the fuel pump soon after
Old Apr 18, 2005 | 11:08 AM
  #6  
ftransam1's Avatar
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Re: BLMs at 160 all the time?

I scanned it again this morning and they read 160 on both sides at idle in closed loop. At 3k rpms the left side drops to 142 and the right goes down to 158. Could it possibly be the regulator? If so how do I test it or should I just buy a new fuel pump?
Old Apr 18, 2005 | 11:34 AM
  #7  
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Re: BLMs at 160 all the time?

A fuel pressure test would answer your questions.
Old Apr 19, 2005 | 06:06 AM
  #8  
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Re: BLMs at 160 all the time?

Either fuel pressure, o2's or a vacume leak, any leak before the MAF wil do this for ya.

Reason being, MAF will read low as not all air will pass through it, PCM will start with little fuel, then the 02's will be like HEY thats all screwy, need to compensate by BLA.

Then what happens is you are already rich in open loop but the PCM learns LEAN and adds 40 BLM of lean into the open loop formula making her hella rich just before starting, once started should be ok as the thing would continue to have the leak before the MAF.

So check that, perhaps a rip on the elbow.
Old Apr 19, 2005 | 02:39 PM
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Re: BLMs at 160 all the time?

IF your car has good fuel pressure, pull the vacum line off your regulater and spray a very small amount of gas or sarting fluid in the line, if you car starts right up, your injectors are to clogged to spray the correct amount of fuel to start your car.
Old Apr 19, 2005 | 03:07 PM
  #10  
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Re: BLMs at 160 all the time?

thanks I'll try that hopefully I can find someone with a fuel pressure guage
Old Apr 21, 2005 | 06:59 PM
  #11  
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Re: BLMs at 160 all the time?

Originally Posted by kaotik_good
thanks I'll try that hopefully I can find someone with a fuel pressure guage
dont pirate my name
Old Apr 22, 2005 | 03:19 PM
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Blownbird355's Avatar
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Re: BLMs at 160 all the time?

Originally Posted by bunker
Either fuel pressure, o2's or a vacume leak, any leak before the MAF wil do this for ya.
I think he means after the maf a leak before maf will not harm.
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