Notices
Silverado & Fullsize Pick-ups The Silverado has been one of the best selling trucks in the US for decades, and is truly proven to be "like a rock".

2014 Chevy Silverado
Platform: Truck, GMT 400, 800, & 900
Old August 11th, 2015, 1:22 PM
How-Tos on this Topic
Last edit by: IB Advertising
See related guides and technical advice from our community experts:

Browse all: Powertrain Guides
Print Wikipost

check engine light, stabilitrak, traction control, bank 1 & 2 lean

Old July 30th, 2013, 2:16 PM
  #21  
CF Beginner
Thread Starter
 
Join Date: Jun 2013
Posts: 19
Likes: 0
Received 0 Likes on 0 Posts
Default

yeah, its just frustrating. I mean i tried to do as much research as i could to figure out this problem, but seems like no one really knows what the problem is. There is some consilation in knowing that it could have been more if i went to a dealer and had them try to fix it, but I can't say I'll feel any better when I go down the same road that everyone else has replacing everything on the truck and dump a 1000 bucks into it and still have the same problem. As I replace things hopefully someday, one of them will actually fix the problem. I'll keep posting as I go through the process so that hopefully i can save someone from doing the same thing and wasting a bunch of time and dumping a bunch of money into their vehicle for no reason.

Last edited by jphurst36; July 30th, 2013 at 2:21 PM.
jphurst36 is offline  
Old July 30th, 2013, 10:38 PM
  #22  
CF Beginner
Thread Starter
 
Join Date: Jun 2013
Posts: 19
Likes: 0
Received 0 Likes on 0 Posts
Default

okay so same reading po171/174 bank1/2 lean. So I checked the fuel pressure again and it was showing 43/44 so my fuel pump was fine. turn the engine off and fuel pressure slowly climbs, all the way to 70/72 as soon as i start the engine, it hold for about 10 seconds at 58 and drops down to 43/44. I'm assuming the only other thing this could be is the fuel pressure regulator? any thoughts, any and all help would be greatly appreciated.
thanks
jphurst36 is offline  
Old July 31st, 2013, 12:12 AM
  #23  
CF Beginner
Thread Starter
 
Join Date: Jun 2013
Posts: 19
Likes: 0
Received 0 Likes on 0 Posts
Default

been trying to do research, but haven't found anything on how to replace the pressure regulator. i thought i read somewhere that its under/built into the intake manifold. can anyone confirm or deny where the heck its at and/or give me any pointers on how to swap it out........i'm looking at trying to get the part tomorrow and swap it out. again, any help would be greatly appreciated.
thanks
jphurst36 is offline  
Old July 31st, 2013, 1:23 PM
  #24  
CF Beginner
Thread Starter
 
Join Date: Jun 2013
Posts: 19
Likes: 0
Received 0 Likes on 0 Posts
Default

Okay, doing more research and it looks like the "fuel pressure regulator" for my 5.3L AFM motor is actually a fuel pressure sensor? Is that correct?
Its also my understanding that this sensor is built into the fule pump assembly. If thats the case, I have a hard time believing that both fuel pumps had bad sensors, so is there something else I'm missing? could it be the connector, relay, fuse, something like that? i would think the sensor power and fule pump power would be from the same source so if one had a power issue they both would? I'm in desperate need of some help here.
thanks
jphurst36 is offline  
Old July 31st, 2013, 2:28 PM
  #25  
Administrator
 
in2pro's Avatar
 
Join Date: Apr 2008
Location: Austin, Texas
Posts: 7,522
Likes: 0
Received 0 Likes on 0 Posts
Default

I don't have access to my service manuals at the moment so I can't provide much info... I may be able to this evening though...as a suggestion you might try getting the 1yr subscription to All Data diy as they have the 07 info and it can help you identify and repair lots of stuff.. its basically the factory repair manual on line...
IF you Google alldata diy coupon you can get a couple bucks off the $15 yr subscription...
in2pro is offline  
Old July 31st, 2013, 7:33 PM
  #26  
Administrator
 
in2pro's Avatar
 
Join Date: Apr 2008
Location: Austin, Texas
Posts: 7,522
Likes: 0
Received 0 Likes on 0 Posts
Default

The documents I have don't show a regulator for the 5.3 ?
in2pro is offline  
Old July 31st, 2013, 10:51 PM
  #27  
CF Beginner
Thread Starter
 
Join Date: Jun 2013
Posts: 19
Likes: 0
Received 0 Likes on 0 Posts
Default

yeah, the research i was doing initially said the regulator was built into the air intake manifold and you had to remove the manifold to replace it. i haven't been able to find that site again and everything i've found since doesn't show a regulator, just a sensor on the fuel pump.
is there anything else i can do to troubleshoot? anyone understand why a brand new pump would have a low pressure issue? what actually regulates the pump pressure to the fuel injectors? if its the pcm or ecm, what would make it reg the pressure down from 58 to 44? i'm lost, any help would be appreciated? maybe remap the ECU/ECM?
jphurst36 is offline  
Old August 3rd, 2013, 12:32 PM
  #28  
CF Veteran
 
Join Date: Feb 2012
Location: nebraska
Posts: 1,433
Likes: 0
Received 0 Likes on 0 Posts
Default

well since ive been working for dodge i havent had hands on a 5.3 in a while but the last version i worked on the fpr was just clipped on the drivers side fuel rail and vacuum actuated so you could just unplug the line to check it
cleveland63b is offline  
Old July 18th, 2016, 3:33 PM
  #29  
CF Beginner
Thread Starter
 
Join Date: Jun 2013
Posts: 19
Likes: 0
Received 0 Likes on 0 Posts
Default

Sorry for not closing the loop on this post, but in the end after all the troubleshooting I did and the money I wasted on a new fuel pump the issue was a vacuum leak.
There is a plastic tab on the aft passenger side of the plastic intake manifold that looks like the top on a kids fruit juice bottle that got clipped when I removed the engine cover and reinstalled it.
I didn't see it the vacuum leak wasn't very load and it took forever to pin point it. Seems like a poor design, but the fix is simple, just get a quart inch rubber nipple and cap it.
I'll have to take pics and post them so people can get a visual.
jphurst36 is offline  
Old September 4th, 2016, 1:18 PM
  #30  
CF Beginner
 
Join Date: Sep 2016
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
Default Same issue

Originally Posted by jphurst36 View Post
Sorry for not closing the loop on this post, but in the end after all the troubleshooting I did and the money I wasted on a new fuel pump the issue was a vacuum leak.
There is a plastic tab on the aft passenger side of the plastic intake manifold that looks like the top on a kids fruit juice bottle that got clipped when I removed the engine cover and reinstalled it.
I didn't see it the vacuum leak wasn't very load and it took forever to pin point it. Seems like a poor design, but the fix is simple, just get a quart inch rubber nipple and cap it.
I'll have to take pics and post them so people can get a visual.

Thank you for sharing! I'm going through the EXACT same thing with my vehicle right now! We were thinking it was the fuel pump but I'm glad I found your post. Do you mind sharing the picture of what your replaced?
Lyg07 is offline  

Thread Tools
Search this Thread
Quick Reply: check engine light, stabilitrak, traction control, bank 1 & 2 lean


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: