Go Back   Chevrolet Forum - Chevy Enthusiasts Forums > Current Chevy Trucks, SUV's, Crossovers & Vans > Tahoe & Suburban
Sign in using an external account
Register Forgot Password?
Search

Tahoe & Suburban The power, space, and brutal towing ability make the Tahoe and its longer sibling, the Suburban, arguably the best full size SUV's on the market today.

2013 Chevrolet Suburban
Platform: GMT 400, 800, 900

Reply
 
 
 
 
LinkBack Thread Tools
  #1  
Old 01-17-2009, 02:52 PM
Junior Member
 
Join Date: Apr 2008
Posts: 8
Default 99 Suburban OBDII codes

Once in November, and then twice in the past week, my suburban has the SES light come on. I went and had the codes read all three times, and each time it was
P0172 - rich bank 1
P0175 - rich bank 2
P0305 - Misfire cylinder 5

Here is the history on the vehicle.

172,000 miles
Two new fuel pumps in past 18 months
Last time replaced was in June of '08, at
which time I also replaced the catalytic converter as well.
New OEM spark plugs in December.
When I replaced the plugs, number 5 was a little darker
than the others, looking like it was running rich.

Autozone said my MAF may be bad if both codes (P0172 and P0175) set
at the same time.

Anyone have any thoughts on this?

Thanks in advance.

Smittygj
Register today for free or log-in if already registered to remove this ad!
Reply With Quote
  #2  
Old 01-18-2009, 02:30 PM
MDTAHOE's Avatar
Super Moderator
Professional Mechanic
 
Join Date: Nov 2008
Location: Bowie, MD
Posts: 2,955
Default

Maf is a possiblity although I rarly see them go bad on thease trucks. Also the usually set a lean code not rich. You need to check fuel pressure. You would be looking for it to be to high. And you also want to see how quickly it drops when the key is turned off it is possible that #5 is stuck open.
__________________
ASE Master Tech, L1 Advance Engine Performance certified
__________________________________________________ ___________________________
I will not answer repair questions by PM, if you would like my input you can PM me and ask me to reply to your public thread.
Reply With Quote
  #3  
Old 01-18-2009, 06:42 PM
shawnvw's Avatar
Super Moderator
Professional Mechanic
 
Join Date: Jan 2008
Posts: 2,571
Default

Could have a small peice of crud cause #5 injector to stick open just a little too long.
Get a quality injector cleaner or find a shop with the equiptment to clean your injectors
__________________

If you have a question, ask it in the forums. I will no longer be answering questions sent to my email.
Reply With Quote
  #4  
Old 01-22-2009, 08:28 PM
Senior Member
 
Join Date: Mar 2008
Location:
Posts: 158
Default

I have seen the fuel pressure regulator fail internally several times on these. It will suck fuel through the vacuum hose, which plugs into intake right above cyls 3 & 5. W/engine running pull vacuum hose off regulator & wait a few seconds. If fuel starts coming out of regulator vacuum nipple, your regulator is bad.
__________________
ASE Master Auto ,L1
Reply With Quote
  #5  
Old 01-22-2009, 09:35 PM
in2pro's Avatar
Administrator
2007 Chevrolet Tahoe
 
Join Date: Apr 2008
Location: Austin, Texas
Posts: 6,220
Default

170K + I'd consider repalcing the poppets and injectors and while your there the regulator, try not to be to freaked out by all the carbon build up under the manifold from the EGR.
As for the MAF it might be a good idea to pull it out and clean it first as it is probably got a fine coat of dirt and debris from the high mileage that and its a good idea to check the air intake snorkle for any thing that may have gotten past the air filter while it was off i.e. a leaf a chuck of foam from the air filter (this happen to me and the engine would run fine but sometimes just dive and nearly stall)
Turns out while putting the air cleaner on I caused a protion of the foam ring to tear off and it got sucked up into the cold air intake and was blocking air flow at the MAF, but it would fall away and the engine would run fine until it got sucked up against the MAF again..
__________________
Looking to advertise in the forum? click here > Internet Brands
Reply With Quote
  #6  
Old 01-26-2009, 05:08 PM
Senior Member
 
Join Date: Mar 2008
Location:
Posts: 158
Default

Quote:
Originally Posted by jkgray80 View Post
I have seen the fuel pressure regulator fail internally several times on these. It will suck fuel through the vacuum hose, which plugs into intake right above cyls 3 & 5. W/engine running pull vacuum hose off regulator & wait a few seconds. If fuel starts coming out of regulator vacuum nipple, your regulator is bad.
Brain fart. We are talking 5.7 ,not 5.3. Internal regulator leak is 5.3 problem.
Injectors are 5.7 problem.

Im surprised nobody yelled at me!
__________________
ASE Master Auto ,L1
Reply With Quote
Old 01-26-2009, 05:08 PM
 
 
 
Reply

Tags
57, 99, code, codes, gm, lean, listing, obd, obd2, obdii, p0172, p0175, p0305, running, suburban


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On


Join Chevroletforum
Advertising

Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -5. The time now is 04:32 AM.

Internet Brands, Inc.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO ©2010, Crawlability, Inc.

Emails Backup