Author Topic: BLM's Up-Why?  (Read 9201 times)

0 Members and 1 Guest are viewing this topic.

Offline good2win22

  • Turbo Street Outlaw
  • *******
  • Posts: 2019
  • PSI: 0
  • No man lives happily lest he remove the boredom
    • View Profile
Re: BLM's Up-Why?
« Reply #15 on: July 13 2017, 10:16:04 PM »
Run some smoke thru it and see where the leak is if any at all
Jason

1966 Ford Ranch Wagon
1982 Jeep Wagoneer Limited
1986 Grand National BLK PHNX
1987 Turbo Regal Limited
2018 Ram 2500 Cummins

Offline Steve Wood

  • Turbo Street Outlaw
  • *******
  • Posts: 9882
  • PSI: 34
    • View Profile
    • http://www.vortexbuicks-etc.com/
Re: BLM's Up-Why?
« Reply #16 on: July 14 2017, 12:27:27 AM »
sounds like it fixed itself....ever yone else wants 128 and you got it!
Steve Wood

http://www.vortexbuicks-etc.com

A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline Scoobum

  • Turbo Street Outlaw
  • *******
  • Posts: 5549
  • PSI: 3
  • YOU CAN'T HANDLE THE TRUTH!!!!
    • View Profile
Re: BLM's Up-Why?
« Reply #17 on: July 14 2017, 08:36:05 AM »
I've never bought into the 128 crap. Steve, you and I both know if the BLM's rise out of nowhere...then something's up. That's why we have scan tools...to monitor this stuff. It's raining as usual, so nothing will likely get checked today. If that big yellow thing in the sky comes out I'm gonna check for exhaust leaks...and slap in a new PCV valve and 02 sensor.

I want everyone's input on this. I've stated here before that my opinion of Felpro head gaskets is that the quality level has slipped. I think I read a post from Paul from MAGNA state the same thing. The fire rings are literally egg shaped. Is it possible the combustion could travel across the open deck and head to the fire ring and eat away at it...with the higher combustion pressure forcing the fire ring towards the intake side...causing an air leak and making the BLM's rise.
Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

RIP Scott Hall AKA Razor Ramon

Offline Steve Wood

  • Turbo Street Outlaw
  • *******
  • Posts: 9882
  • PSI: 34
    • View Profile
    • http://www.vortexbuicks-etc.com/
Re: BLM's Up-Why?
« Reply #18 on: July 14 2017, 09:45:51 AM »
Given the wide range of correction provided by the ecm, blms are not all that significant within the greater scheme of things and people tend to forget that blm are ignored at wide open throttle.  I find them most useful if there is a sudden change from the normal range indicated by the ecm meaning something has changed in the car.  A change of 10 can be attributed to both ambient conditions as well things like fuel pressure or leaks.  It's all a guess by the programmer initially anyway.

I agree with Paul, I think Felpros went down hill several years ago.  That's why I always suggest the VR's on the average car.
Steve Wood

http://www.vortexbuicks-etc.com

A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline Scoobum

  • Turbo Street Outlaw
  • *******
  • Posts: 5549
  • PSI: 3
  • YOU CAN'T HANDLE THE TRUTH!!!!
    • View Profile
Re: BLM's Up-Why?
« Reply #19 on: July 14 2017, 10:18:44 AM »
I race this car in temps in the 40's to 90's...and the BLM's stay locked at 118...so it's not that. I swapped out a bunch of vacuum lines. I'm down to an exhaust leak...or a headgasket on the way out on the intake side. I monitor this engine like a hawk. Max boost has been 25 PSI and always on a safe tune without a hint of KR. I'm gonna be pissed if this is a headgasket going south.
Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

RIP Scott Hall AKA Razor Ramon

Offline Steve Wood

  • Turbo Street Outlaw
  • *******
  • Posts: 9882
  • PSI: 34
    • View Profile
    • http://www.vortexbuicks-etc.com/
Re: BLM's Up-Why?
« Reply #20 on: July 14 2017, 10:48:35 AM »
After about 17 years of being beaten on hard, my son's T is pressurizing the radiator a bit when it is cranked up....I guess the hgs are beginning to seep
Steve Wood

http://www.vortexbuicks-etc.com

A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline Scoobum

  • Turbo Street Outlaw
  • *******
  • Posts: 5549
  • PSI: 3
  • YOU CAN'T HANDLE THE TRUTH!!!!
    • View Profile
Re: BLM's Up-Why?
« Reply #21 on: July 15 2017, 07:21:17 PM »
Update. I checked the nuts on both sides where the crossover bolts up...and they're snug. Proper igniton module is installed. BLM's still at 128. Now riddle me this. I removed 2 vacuum hoses from the steel lines. First the one going to the EGR...which I have capped...as I did away with it. BLM's stayed at 128. I removed the one going to the one way check valve...BLM's at 128. Should the BLM's not have gone up with the huge vacuum leak?
Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

RIP Scott Hall AKA Razor Ramon

Offline Steve Wood

  • Turbo Street Outlaw
  • *******
  • Posts: 9882
  • PSI: 34
    • View Profile
    • http://www.vortexbuicks-etc.com/
Re: BLM's Up-Why?
« Reply #22 on: July 15 2017, 08:29:51 PM »
Is this the idle blm block that is off?
Steve Wood

http://www.vortexbuicks-etc.com

A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline Scoobum

  • Turbo Street Outlaw
  • *******
  • Posts: 5549
  • PSI: 3
  • YOU CAN'T HANDLE THE TRUTH!!!!
    • View Profile
Re: BLM's Up-Why?
« Reply #23 on: July 15 2017, 09:54:46 PM »
Is this the idle blm block that is off?

Yes
Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

RIP Scott Hall AKA Razor Ramon

Offline Steve Wood

  • Turbo Street Outlaw
  • *******
  • Posts: 9882
  • PSI: 34
    • View Profile
    • http://www.vortexbuicks-etc.com/
Re: BLM's Up-Why?
« Reply #24 on: July 16 2017, 09:41:35 AM »
what about the higher cells?  Are they also higher than before?
Steve Wood

http://www.vortexbuicks-etc.com

A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline Scoobum

  • Turbo Street Outlaw
  • *******
  • Posts: 5549
  • PSI: 3
  • YOU CAN'T HANDLE THE TRUTH!!!!
    • View Profile
Re: BLM's Up-Why?
« Reply #25 on: July 16 2017, 10:22:45 AM »
what about the higher cells?  Are they also higher than before?

Steve, I have lots of PL files from recent track outings. I'll have a look and post back tonite. Thanks for your help on this one. It's got me stymied.
Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

RIP Scott Hall AKA Razor Ramon

Offline Scoobum

  • Turbo Street Outlaw
  • *******
  • Posts: 5549
  • PSI: 3
  • YOU CAN'T HANDLE THE TRUTH!!!!
    • View Profile
Re: BLM's Up-Why?
« Reply #26 on: July 16 2017, 10:32:07 AM »
Steve, I have a spare ECM we can try if you think that could be an issue. I've seen them do some stupid things. I'm ordering a new 02 sensor tomorrow morning. It'll be here Tuesday.
Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

RIP Scott Hall AKA Razor Ramon

Offline Steve Wood

  • Turbo Street Outlaw
  • *******
  • Posts: 9882
  • PSI: 34
    • View Profile
    • http://www.vortexbuicks-etc.com/
Re: BLM's Up-Why?
« Reply #27 on: July 16 2017, 12:18:39 PM »
I would start with a new O2 sensor just for the heck of it..mainly because the O2 sensor is the reading that the ecm uses to decide what the blms should do
Steve Wood

http://www.vortexbuicks-etc.com

A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline earlbrown

  • Turbo Street Eliminator
  • ******
  • Posts: 1571
  • PSI: 6
    • View Profile
Re: BLM's Up-Why?
« Reply #28 on: July 16 2017, 12:33:46 PM »
Should the BLM's not have gone up with the huge vacuum leak?

The INTs should move quickly.  If they spend a lot of time elevated, the BLMs should follow.
'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline Scoobum

  • Turbo Street Outlaw
  • *******
  • Posts: 5549
  • PSI: 3
  • YOU CAN'T HANDLE THE TRUTH!!!!
    • View Profile
Re: BLM's Up-Why?
« Reply #29 on: July 16 2017, 02:37:35 PM »
Just finished straightening up the garage...and found 2 new Denso 02 sensors still in the packaging. Think Glen had a half price sale on these awhile back and Dan Keller and I bought a bunch. Steve, it's pouring rain again. I'll get a PL file in the morning so I can make a comparison of the cells. I'll swap the new 02 sensor in then as well. Thanks for the help guys.
Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

RIP Scott Hall AKA Razor Ramon

 

SimplePortal 2.3.7 © 2008-2024, SimplePortal