Last post on May 21, 2013 at 5:03 PM
You are in the Chevrolet Silverado & GMC Sierra
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GMC Sierra 1500, Chevrolet Silverado 1500, Fuel System, Truck
#168 of 363 Re: 2007-08 Chevrolet silverado active fuel managment [gmcustsvc]
Aug 26, 2011 (6:41 pm)
I have an 07 GMC Sierra and I have also been having problems with oil consumption. At about 65,000 miles my "low engine oil light" came on. It had only been 1800 since my last oil change, there was no oil visible on the dip stick. I call the dealer where I purchased the vechile and they advised I bring it in as soon as possible. They changed the PCV valve, Manifold gasket and few other things. Everything was fine for two oil changes then the same problem started happening. I have an appoinment to bring my truck back to the dealership Monday (this will the 6th time) b/c the low oil light came on again and this time it had only been 1500 miles since my last oil change, I'm starting to think this problem will never be fixed and my 100,000 mile warrenty is all most up. Does anyone if there is a fix for this problem? Thanks
Aug 28, 2011 (9:38 am)
I wonder if you bypass or reprogram the AFM where it stays in 8 cyl mode all the time if it will help? A friend who is a GM mech said they were having issues with replacing pistons due to this. said it wasn't lubing the cylinders properly that weren't firing/running when in 4cyl mode Just wondering if it will help or not?
I have an 07 with 43,000 miles and so far no problems. Do all these engines have this issue after so many miles or just some of them?
#170 of 363 Re: 2007-08 Chevrolet silverado active fuel managment [jbt4]
Aug 29, 2011 (2:23 pm)
I apologize for your frustrations. Can you please email me with your complete contact information, VIN, current mileage, and involved dealer? I would like to set up a case for you with GM Customer Assistance. This will document your concerns and that you are experiencing them under warranty. Has the dealer involved technical assistance? If not, I would recommend asking them to do so. I look forward to your email.
GM Customer Assistance
#171 of 363 Re: AFM question [stumpman2]
Aug 31, 2011 (12:41 pm)
If you put it in manual mode and shift it to 5th - the AFM will never come on. You can try that.
There is absolutely no truth to the fact they are replacing cylinders due to AFM.
Read how it works-it's a very simple system-
#172 of 363 Re: AFM question [chuck1]
Aug 31, 2011 (12:59 pm)
Mine is an 07 and doesn't have a manual mode that I know of.....Not sure why he would lie being it didn't have an effect on me. Said there were 5 in there being worked on or had been worked on. Said something about not getting enough lubricant to the cylinders or something to that effect.
#173 of 363 Re: AFM question [stumpman2]
Aug 31, 2011 (2:57 pm)
There are hundred of thousands of these motors on the road when you include all models of GM cars....
Do a google search - see for yourself. I guess maybe a few have had problems. I couldn't find anything on a google search.
#174 of 363 Re: AFM question [chuck1]
Aug 31, 2011 (4:26 pm)
Read on other GM boards many people are having issues with 07NBS and newer trucks using a lot of oil between changes and having engine troubles. Not hard to find at all if you look.
#175 of 363 Re: AFM question [stumpman2]
Aug 31, 2011 (7:17 pm)
It's not a lot of trucks. I understand, if it's yours its important. BUT, very few trucks are having oil consumption issues. I have looked at those other boards AND the NUMBER OF POSTERS who claim they are having issues.
The vast majority are happy.
#176 of 363 Re: 2007-08 Chevrolet silverado active fuel managment [gmcustsvc]
Sep 09, 2011 (11:20 am)
Had it back to the dealer twice and its still using oil. They overfilled it for the first consumption test so after it burned that up I'm on my second consumption test now. Once I saw your (or another service person) post about a 5.3L AFM with under 36K miles should use 1 quart every 2000 miles I decided to trade it in and never buy a GM vehicle again. I have cars and trucks that had over 100K miles that NEVER used any oil between changes. When will GM finally realize that this engine is a lemon and do right by their customers? My guess - never.
#177 of 363 GM 5.3L Active Fuel Management Oil Consumption
Sep 11, 2011 (8:59 am)
I have a 2007 GMC Sierra SLT Crew Cab with a 5.3 AFM Motor. The day I drove this truck off the Dealer Lot in Jan. 2008 brand new it had multiple warranty issues.
1.)Rear Power Window did not work.
2.)Drivers Side Seat Motor did not work.
3.)Whole Carpet Kit had to be replaced because of defect causing it to fall down under the brake and gas petal. They took out full interior trim and broke all clips that hold all plastic pieces in place.
4.)Recall for Window Washer Heater. Causing Trucks to catch fire. Took it out and dissabled it.
5.)Stering Wheel Control Lights would not work.
6.)All 4 Door Handles Broke, almost off the truck.
7.)Oil Dip Stick Tube broke away from the block at the bolt.
8.)A/C Wire Harness to the fan blower motor.
10.)Oil Consumption with AFM. They opened up the motor and put some coller on the AFM valve.
Not even my first oil change since having the work done and it consumes again with the message coming on Low Oil.
Local GMC Dealer " Phillips Buick GMC " Fruitland Park, Florida has been the ones to perform the repairs. On the second time in about the oil consumption I am being given the run around about it not being a problem. And they want to do a 1000 Mile test VS the standard 2000 mile 1 quart test. Even after the valve coller work to repair this problem, it still exists at the same rate.
Along with the consumption issue I also noticed that my gas mileage went down. I complained of this as well. I haven't got more than 15 MPG on Highway almost since new. Sticker says 16 MPG City, 21 MPG Highway. After they did the work I got about 2.5 MPG more for about 6 tanks of gas. Then the gas mileage droped again and the oil low message came on again.
I had such a problem with an aftermarket warranty that the original GMC Dealer " Fountain Auto Mall " Orlando, Florida,sold me. They sold me a $2,400 warrany that when I had to use it at Phillips GMC I was told that Phillips GMC would not honor it even though I bought it from another GMC Dealer. I also found out that the second warranty that I was sold ONLY provided the exact same coverage that the manufacture sold with the truck. 36,000 bumper to bumper and 100,000 drive train. I finally called the aftermarket warranty company and got $800 prorated back to me.
I am currently consulting an Attorney for action against GM for the Lemon. And the original Dealer Fountain Auto Mall GMC for their deceptive practice of the useles aftermarket warranty.
The firm that I am using is Krohn & Moss, Ltd. they will take a case for free if it is legit.
I'm interested in any feedback anyone may have.