Jump to content

2003 Burb 2500 With 8.1 Failed Inspection Due To Only 2 O2 Sensors

mw442

By mw442
in 2000-2014 Silverado HD & Sierra HD

Recommended Posts

mw442 Enthusiast

mw442

Posted
Posted

My car has passed inspection for the last 5 years since at the same station I bought it from someone with no problem. Brought it in and the guy said my car is supposed to have 4 sensors not 2. He said however put the Borla exhaust in hacked it and took out the sensors. There is no place to plug them in the harness and the check engine light is off so i said how can that be. He even said he called chevy and they told hime the same thing. I have seen it on other sites people had a similar issue with the 8.1 some have 4 some have 2. i need some kind of documentation or I am screwed and cant get it inspected or registered. need help ASAP!

Reject Enthusiast

Reject

Posted
Posted
My car has passed inspection for the last 5 years since at the same station I bought it from someone with no problem. Brought it in and the guy said my car is supposed to have 4 sensors not 2. He said however put the Borla exhaust in hacked it and took out the sensors. There is no place to plug them in the harness and the check engine light is off so i said how can that be. He even said he called chevy and they told hime the same thing. I have seen it on other sites people had a similar issue with the 8.1 some have 4 some have 2. i need some kind of documentation or I am screwed and cant get it inspected or registered. need help ASAP!

 

 

Oops... i read your year wrong... lol

 

Yes, your truck should have 4 total O2 sensors. A previous owner probably used some software to tune out the codes or installed O2 simulators.

yukon25008.1 Senior Enthusiast

yukon25008.1

Posted
Posted

any custom tune/tuner can tell the computer theres only 2 so you dont get a check engine light.

just try another station for inspection.. that will mind there business and not worry about the sensors that arent there.

do you have emmisions where you are?

mw442 Enthusiast

mw442

Posted
  • Author
Posted

yukon nice truck its identical to mine(except a GMC). SO I found this thread and I have suspicions about whether it should have 2 or 4. I scoured the underneath and really cannot find anywhere that the harness or anything else was mucked with there is really no reason to disconnect the O2 sensors on the stock system. Just the cat back exhaust was replaced. I am in NC if that matters and the car doesnt even need emissions the guys was just a dick. Also since it failed at that station and they have a record of it I think they have to re-test it. Ill see if my buddy can do it but he is like 60 miles round trip. Here the thread I found;

 

Has anyone had any problems on their 2005 Silverado with O2 sensors not being installed? I have a 2005 Silverado 2500HD 4X4 with 8.1L big block gas engine and 6 speed manual transmission. It has trailering package and snow plow prep package and camper package. Truck has GVR of 9200lbs. on door. It only has 2 O2 sensors above the catylitic convertors. This is all it had since it was brand new, and I am the only owner. Chevy dealership can not find wiring harness either to plug in replacements. They say it is suppose to have 4 sensors. Mechanic last night told me that he thinks it is because it is rated for >8600lbs. This is the first time this issue has come up in the 4 years that I have had this truck. The dealership told me yesterday that the truck can not be fixed!

 

OK, so now I have found someone else, and someone that supports my claims. The local Chevy dealership states that it MUST have 4. But I have argued with them that it only came with 2. They would not inspect it. The MOTOR 2009 manual that the state of NC uses says it only needs 2. I called and told my salesman, he called AAA Automark and got the "2 only" answer from them, adding that they have found the same problem in other customer Silverado trucks. Fast foward to yesterday, I obtained a vehicle build sheet and this is what it said: "FE9 federal emissions" as 1 order option, but then it also says on the same option order sheet in a different area: "NT9 emission system federal tier 2 phase out". Per a private Chevy mechanic, the NT9 option means that this vehicle pulls as much as the Allison diesel option and does not require the 4 sensors, even though Chevy will tell me it does until they are blue in the face! Is this the same info that you have

 

After consulting an attorney, seeking info from a second dealership, writing to 2 different EPA agency's, writing to "Car Talk", several members of of GM coporate, 2 TV stations, and Ralph Nader org., I found out that this truck does NOT have California emissions. Which is rare compared to batch built trucks by Chevrolet. It is not even suppose to have emissions inspection, since it is over 8600lb. GVR. But it is what I have been telling the 1st dealership and customer service at GM all along.

dewfpo Senior Enthusiast

dewfpo

Posted
Posted

It might be cheaper/easier just to go to a muffler shop and have them weld in 2 bungs and install the 2 rear O2's?

 

DEWFPO

txab Senior Enthusiast

txab

Posted
Posted
It might be cheaper/easier just to go to a muffler shop and have them weld in 2 bungs and install the 2 rear O2's?

 

DEWFPO

You missed the part about having no wiring harness for the after cat O2s.

dewfpo Senior Enthusiast

dewfpo

Posted
Posted
It might be cheaper/easier just to go to a muffler shop and have them weld in 2 bungs and install the 2 rear O2's?

 

DEWFPO

You missed the part about having no wiring harness for the after cat O2s.

 

 

The thought that I failed to complete was ..... if it's the visual inspection part that you will fail, you don't have to hook them up to anything since you don't have any dash lights on.

 

DEWFPO

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • cautious optimist
      2027 Chevrolet Silverado: Official Discussion

      By cautious optimist · Posted

      I never understood the hate for the column shifter. The console shifter just gets in the way, takes up prime cargo space and in my wife's Jeep, the dog constantly bumps the console shifter into neutral!    Best choice ever to just make it a column shifter across the lineup and be done with it.    (Bonus: Makes swapping from a 5 seater to a six seater far easier)
    • cautious optimist
      2027 Chevrolet Silverado: Official Discussion

      By cautious optimist · Posted

      You nailed it with 6 trims. 
    • richard wysong
      Wow I'm in a pickle. (Broke down truck) and a story.

      By richard wysong · Posted

      I had an 88 K1500 with a 5.7 that had those symptoms, I know totally different, it ended up being the ECM. Once you get the fuel system fixed if it still runs lousy you may want to investigate that. it didn't set any codes, stalled ,ran rough at times etc
    • James Beyer
      Trading 7.3 (Godzilla) for G.M.C gas

      By James Beyer · Posted

      Congratulations Isttype, on your gmc. Really like my 2024 2500hd sle doublecab now with 85,500 miles.  I checked the oil today at 4800 miles since last oil change and barely reading on the stick.  I don't care if GM says it's Acceptable adding a quart every 2000 miles because that is 100% BS, It is not a 1966 Harley Shovelhead! Sounds like it's setting up a future failure like I had with my 1500 6.2l. Other than oil consumption problems, I really like the 6.6l gas and 10 speed is really nice.  Towed a light 4000 pound trailer last week and averaged 14 mpg.  I was pretty impressive that a 7300 pound gas truck did 14mpg towing, Later-
    • Grumpy Bear
      OCI, not when but why?

      By Grumpy Bear · Posted

      Long Term Cold Cycle Limited Testing   Back to the 1990's and XOM's million mile test. Since then there have been others and there will be more. Schaeffer's, AMSOIL to name two. Of these Schaeffer's is the stand alone which I will explain in a bit later.    http://papers.sae.org/600190/:   http://papers.sae.org/850215/:   Up to 75% of  engine wear occurs on cold starts. These two links (above) provide the technical reasons for engine wear. In a nut shell, and by a large margin, cylinder wear is what takes out most motors and even with a pre-oiling system that part of the engine is dry enough on cold starts and cold warm up to pierce Stribeck.   So when you put a motor, or a car, on a dyno for a million miles stopping only for oil changes, (yes fuel is uninterrupted) or break down maintenance, you are depriving the test of the most important part of it's wear cycle. Yes a million is then a pretty easy walk even for a mineral oil under those conditions.    How about cleanliness during the long test cycles? Same thing. Varnishes that stick rings and insulate parts are laid down by repetitive 'heat cycles'. It's the cool down the precipitates the varnishes. These long runs also hinder acidic attack caused by cold start richness and less than optimal cold start ring sealing. They hinder water formation and enhance breathing of the crankcase; the petri dish of acid formation, the first step in sludge formation, amalgamation and precipitation. These motors are also monitored and controlled for water and oil temperatures to within the "normal operating range".      https://www.swri.org/sites/default/files/sequence-iiih-test.pdf Note the test sequence in some boutique oils literature for testing, API IIIH, is not the standard used for the ILSAC G7 testing. Does that mean it is irrelevant? No, not as used. As used as a 'visual guide' it makes it's point. The G7 weighted piston deposit minimum is lower.      Back to Schaeffer's. That was a cyclical test of an engine in fleet service and not a dyno mule and if you saw the video it was not mirror clean but wear was low.    There are oils like BioSyn and other 'Renewable" source oils that taught cleanliness and have proven themselves in fleet testing. Havoline an other example.    The newest ILSAC G-7 test prioritize cleanliness, LSPI mitigation and fuel economy OVER WEAR. In comparison Porsche C30 Specification Verses ILSAC G-7 Specification below:      Some will balk that this graph isn't apples to apples and I will challenge that in that this graph represent the SPECIFICATION and not the any One Oil Performance.   It is absolutely possible to minimize wear, maximize cleanliness and mitigate LSPI etc., It just isn't cheap and currently I see none that are not walking toward profit over performance.     

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...