Author Topic: low o2s  (Read 3106 times)

0 Members and 1 Guest are viewing this topic.

Offline shmed

  • Turbo Street Limited
  • ***
  • Posts: 171
  • PSI: 0
    • View Profile
low o2s
« on: August 05 2017, 06:13:02 PM »
what could be. the cause of low o2 readings at idle. like in the 100.  range?   new. sensor
an the Wideband to read 17.9. then shut off?


new motor roller cam roller lifters.   tt5.7 chip.  50 lb injs   stock mass meter

Offline Steve Wood

  • Turbo Street Outlaw
  • *******
  • Posts: 9882
  • PSI: 34
    • View Profile
    • http://www.vortexbuicks-etc.com/
Re: low o2s
« Reply #1 on: August 05 2017, 06:37:42 PM »
sounds like a big air leak somewhere. 
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: low o2s
« Reply #2 on: August 05 2017, 08:07:07 PM »
Only thing outta whack is your IAC count at 40. Should be 10-20. I'm Scooby Doo asking questions on the other board. You in Toronto? I'm retired...and can drop by.
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: low o2s
« Reply #3 on: August 05 2017, 08:19:08 PM »
Just what I've noticed swapping 02 sensors. Once the engine comes up to temp...it'll take a couple of minutes for everything to learn. What I do is watch the 02's on the laptop via the graph.
Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

RIP Scott Hall AKA Razor Ramon

Offline shmed

  • Turbo Street Limited
  • ***
  • Posts: 171
  • PSI: 0
    • View Profile
Re: low o2s
« Reply #4 on: August 05 2017, 08:41:03 PM »
Thanks for the info brad.    id love for you to check out this wreck...
but I'm about 3-4 hours west of Toronto.
So what I. did was block off the exhaust an the intake    put about 5 psi compressed air into the intake track an started soap testing everything ..
when I was about to give up I heard a hiss , so.  I see someone installed an aluminum ear block off plate.   that thing was singing...   offf that. pos came on went a. crude piece of 1/8 steel plate I quickly ground up.   a little silicone,  an fired it up. not up. to par but o2s are in the 600 area. an the Wideband 14ish,


thanks again. Steve an Brad
Dave


Offline Scoobum

  • Turbo Street Outlaw
  • *******
  • Posts: 5549
  • PSI: 3
  • YOU CAN'T HANDLE THE TRUTH!!!!
    • View Profile
Re: low o2s
« Reply #5 on: August 05 2017, 08:48:12 PM »
What town/city are you in?
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: low o2s
« Reply #6 on: August 05 2017, 09:45:49 PM »
That egr plate has burn a lot of us
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 good2win22

  • Turbo Street Outlaw
  • *******
  • Posts: 2019
  • PSI: 0
  • No man lives happily lest he remove the boredom
    • View Profile
Re: low o2s
« Reply #7 on: August 05 2017, 10:37:01 PM »
EGR block off has gotten me twice.  Once on a friends car and then on my barn motor. Then again, I always get gotten
Jason

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

Offline Scoobum

  • Turbo Street Outlaw
  • *******
  • Posts: 5549
  • PSI: 3
  • YOU CAN'T HANDLE THE TRUTH!!!!
    • View Profile
Re: low o2s
« Reply #8 on: August 06 2017, 07:53:42 AM »
I believe this Champion intake I got from my ATR buddy is filled...but I put a fancy ass Turbo 6 cover over it and sealed it as tight as a nuns...well... you know.
Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

RIP Scott Hall AKA Razor Ramon

Offline earlbrown

  • Turbo Street Eliminator
  • ******
  • Posts: 1571
  • PSI: 6
    • View Profile
Re: low o2s
« Reply #9 on: August 06 2017, 01:41:00 PM »
Brass pipe plugs for me.   There's no way I was going to attempt to use that damn plate. There's just too much leverage against the screw for that thing to work troublefree.
'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

 

SimplePortal 2.3.7 © 2008-2024, SimplePortal