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Chevy Silverado and GMC Sierra Duramax Fuel Mileage

620 messages,  Last post on Dec 15, 2012 at 3:45 PM

You are in the Diesels Forum.

What is this discussion about? Chevrolet Silverado 2500HD, Chevrolet Silverado 3500, GMC Sierra 2500HD, GMC Sierra 3500, Diesel, Fuel Efficiency (MPG), Truck

Messages Page 58 of 63

#562 of 620 Cold Air Intake problem by cbears85

Dec 27, 2010 (1:34 pm)

Hi all, I'm not sure this is the correct forum. I have a 2004 GMC Sierra 2500HD. I have an Afe cold air intake stage 2 system installed. I am constantly getting a "check engine" light on all the time. No matter what I do the "check engine" is usually on. I have tried cleaning the air filter but to no avail. Every once in awhile the "check engine" light will go off but only temporarily. As soon as I accelerate the light comes back on. Someone told me it could be the max air flow sensor that is mounted on the intake pipe that comes from the filter and goes to the engine. Does anyone know what causes the "check engine" to stay on and is there a permanent fix? It is driving me crazy. Any help would be greatly appreciated.

#563 of 620 Re: Cold Air Intake problem [cbears85] by coontie66

Dec 27, 2010 (1:50 pm)

Replying to: cbears85 (Dec 27, 2010 1:34 pm)
Exactly a year my check engine light on my 06 started coming on and never went off. Chev folks look at it 4 times or so and cleaned the turbo and other turbo related things until they replace it. Problem solved.
 
You need to put it on the computer and see what the error code is.

#564 of 620 Re: Cold Air Intake problem [cbears85] by kacansas06

Dec 27, 2010 (2:15 pm)

Replying to: cbears85 (Dec 27, 2010 1:34 pm)
I think you have messed with a complex computer system. It could be you have too much restriction. I know the people who sell those systems say they flow better but do they have as big a stake in it working correctly as GM. Check the package or web site it will basically say use at your own risk. My 06 filter seems to let nothing through for the passage behind it is very clean. Just checked it less than a month ago. I have replaced the filter 4 times so far. I can not imagine changing the intake setup without other major changes such as new higher flow turbo along with intercooler, piping, manifold and electronics changes. One can get slightly better power by reducing exhaust restrictions which also leads to cooler EGT temperatures. My Guess would be you are having EGT problems which can happen with too much air(runs lean) or too little. A diesel is a simple engine but made more complex be the turbo. Messing with intake can be a route to turbo failure.

#565 of 620 my take by hillsdale56

Dec 27, 2010 (2:33 pm)

I agree with the guy who told you to find out what code your getting. A thought I'm getting right now, clean your mass air flow sensor. Use either or carb cleaner. Engine OFF. SEE what happens

#566 of 620 Re: Cold Air Intake problem [kacansas06] by cbears85

Dec 28, 2010 (9:14 am)

Replying to: kacansas06 (Dec 27, 2010 2:15 pm)
Thank you very much for your input. My truck is not a diesel and does not have turbo. It has the 6.0L gas engine. With that in mind, I don't believe it is having EGT problems. Along with the Afe cold air intake, I also had dual Areo turbine mufflers installed. I don't know if that makes a difference or not. I guess I will need to get it on the computer to see what the error code is and then go from there. Again, thanks for you input and time.

#567 of 620 Re: Cold Air Intake problem [cbears85] by kacansas06

Dec 28, 2010 (11:54 am)

Replying to: cbears85 (Dec 28, 2010 9:14 am)
A gas engines computer system is even more complex than a diesels due to the emissions control system and the ignition system. Many, Many of the check engine light on situations with a gas engine are due to some component of the emissions system getting old and worn out. A computer code check should tell you what is wrong or at least what system is failing. Most common is EGR valves getting gummed up or Oxygen sensors that are in the exhaust manifold along with an EGT sensor getting literally burned out. Your truck is 7 model years old and was most likely built in late 03 to very early 04 so it most likely has enough miles to make these things a problem. You can replace them yourself if you get the correct diagnosis. Good luck

#568 of 620 Re: my take [hillsdale56] by cbears85

Dec 28, 2010 (12:15 pm)

Replying to: hillsdale56 (Dec 27, 2010 2:33 pm)
Thank you very much for your input. Just some added information, my truck is not a diesel and does not have turbo. It has the 6.0L gas engine. Along with the Afe cold air intake, I also had dual Areo turbine mufflers installed. I don't know if that makes a difference or not. I guess I will need to get it on the computer to see what the error code is and then go from there. Also, I will try the mass air flow sensor cleaning and see what that does. Again, thanks for you input and time.

#569 of 620 Re: my take [cbears85] by hillsdale56

Dec 28, 2010 (2:05 pm)

Replying to: cbears85 (Dec 28, 2010 12:15 pm)
The guy who wrote post 558 was right on the money. I thought you ran diesel. The reason I said clean the mass air flow sensor is you said you cleaned and I presume reoiled the air filter a few times. The engine will pull oil into air intake, and coat the sensor. You said it went out sometimes. Try it see what happens. If not go get the dtc codes. Hope you find your trouble

#570 of 620 d-max mileage by barrail

Jan 07, 2011 (6:03 am)

To hillsdale56 , I responded on 1/4/11 but can't find my thread anywhere. So lets try this again. I havea '05 lly with 373's and line in the suburbs of chicago. 500' above sea level. I agree with filling the throte on the fuel tank to check mileage. always buy my fuel at the local Farm Service where the local school busses fill up. Did I understand you correctly to say that you can't run your truck in 6 lockup? Hope this thread gets to you.

#571 of 620 Re: d-max mileage [barrail] by hillsdale56

Jan 07, 2011 (7:42 am)

Replying to: barrail (Jan 07, 2011 6:03 am)
Hey what's up? What you read is true. When diesel domination reprograms the ecm, it brings the max torque to 1900~ 2000 rpm. I have 373 also. My engine runs around. 63 mph. The engine runs stronger in fifth now. The easy tuner has a feature to monitor engine performance. That is sure way to tell. I have to have someone with me to watch the screen and see where the highest turbo boost is. I will post a thread when I do this

Messages Page 58 of 63

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