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07-31-2020, 03:20 PM
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#1 |
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Registered User
Join Date: Feb 2007
Location: Blairsville, PA
Posts: 301
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Scanningr for codes
When I scan the computer where it shows ready to fire and all that, two lines show 025 and H025 not ready. Could this be a problem with the tune ( I am battling P0171 and P0174 codes) or is it something that was deleted? Also, does anyone have the part number for the vacuum port for the brake booster on a 2007 4.8. I would like to replace mine to eliminate a possible cause for my supposed vacuum leak. Thanks, Tbrown
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tbrown's 56 Cameo Build |
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07-31-2020, 06:01 PM
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#2 |
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Moderator
 
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,210
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Re: Scanningr for codes
Passenger side of intake manifold on side of top chamber is a vacuum port usually used as a blend door vacuum source....
If you dont need it, just plug it... What vacuum ports are you wanting to add? Power brakes ? 
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox 
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07-31-2020, 09:44 PM
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#3 |
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Registered User
Join Date: Feb 2007
Location: Blairsville, PA
Posts: 301
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Re: Scanningr for codes
I am using that port for vacuum wipers. Not trying to add anything, just trying to find vacuum leak or cause for P0171 and P0174 codes. I have power brakes, and just want to make sure the swivel on the booster port isn't leaking vacuum.
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tbrown's 56 Cameo Build Last edited by AussieinNC; 08-01-2020 at 12:49 PM. |
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07-31-2020, 11:01 PM
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#4 |
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Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: Scanningr for codes
It's rare for the booster port o-ring to leak, Intake gaskets are common & the intake itself being cracked is very common on wreaking yard engines.
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08-01-2020, 12:50 PM
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#5 | |
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Moderator
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,210
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Re: Scanningr for codes
Quote:
As clinebarger said...intake gaskets and intake manifold leaks, especially under the manifold...
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox
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08-01-2020, 11:11 PM
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#6 |
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Registered User
Join Date: Feb 2007
Location: Blairsville, PA
Posts: 301
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Re: Scanningr for codes
Already changed the intake gaskets, but will block off that port and try it. Thanks for the help.
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tbrown's 56 Cameo Build |
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08-02-2020, 10:16 PM
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#7 |
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Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: Scanningr for codes
If the O-ring is leaking.....There really isn't a way to block it with the quick release mechanism & all.
Though your booster may be leaking.....Clamp/pinch the booster line to confirm. Can you watch live Fuel Trim Data?? A vacuum leak will show as high trim corrections at idle & correct under acceleration. Normal trims at idle & positive corrections under acceleration would be a fueling issue. (MAF, Injectors, Fuel Pressure) |
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08-02-2020, 10:41 PM
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#8 |
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Registered User
Join Date: Feb 2007
Location: Blairsville, PA
Posts: 301
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Re: Scanningr for codes
That is new information to me, I will check it out. Thanks
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tbrown's 56 Cameo Build |
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09-02-2020, 09:23 PM
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#9 |
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Registered User
Join Date: Nov 2011
Location: Williamsburg, VA
Posts: 960
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Re: Scanningr for codes
Also make sure your pcv on the valve covers are hooked up as this will throw the codes.
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09-02-2020, 09:37 PM
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#10 |
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Registered User
 
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,626
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Re: Scanningr for codes
Subbed for new knowledge......
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1969  307, t3501950 Chevy Wagon 1978 Big 10 1967 C10, 250,3-OTT |
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09-04-2020, 02:27 PM
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#11 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,238
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Re: Scanningr for codes
they do sell a plug that will go into the booster hole(used on trucks with hydro boost) spot no longger sold by gm they are a dimond in the rough if u find one everyone wants good money for them i got lucky and soeone here on the fourm sent me one since im using manaul brakes still
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