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2007/2008 Silverado and Sierra Active Fuel Management Problems

106 messages,  Last post on Sep 01, 2009 at 9:04 PM

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What is this discussion about? GMC Sierra 1500, Chevrolet Silverado 1500, Fuel System, Truck

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#64 of 106 Re: New Sierra & AFM [raymaz] by obyone Sep 23, 2008 (11:54 pm)
Replying to: raymaz (Sep 23, 2008 6:13 pm) 50-55 mph is where most of the resonances in a vehicle converge for some reason. That's why there's no vibration at 45 or 65 but keep it at 55 mph and you've got a bumpy ride. This is usually attributed to the tires.
#65 of 106 by asylum575 Sep 25, 2008 (4:57 pm)
I remember I had a 2003 Silverado with the 4.8 engine. I dualled out the pipes and installed a flowmaster. At 50-55 MPH there was an incredible roar and vibration. Had to keep it above 60 to avoid it. Don't remember having the problem before the exhaust work.
#66 of 106 problems with a 2008 gmc sierra 5.3 by misswench Sep 26, 2008 (10:29 am)
Hi everyone!! my sister just bought a 2008 gm sierra 5.3 ,she has had it for almost 6 months !! and we are experiencing problems she said it was like the gas peddle just went to the floor on her!! she narrowly missed hitting a school bus and chose the ditch instead which ended up being the safest course of action but she did hurt herself !! we had the truck towed back to the dealership and they are now saying that they cannot find a problem for it !!!! If anyone out there has had any similar experiences please let me know as There is a problem and we need to get something done about this Replies to this message: rednecktroy (Sep 28, 2008 4:15 pm) jess20 (Dec 08, 2008 3:09 pm) obyone (Dec 08, 2008 3:14 pm) jess20 (Dec 09, 2008 4:43 pm) Beefnutz (Dec 09, 2008 5:45 pm) jess20 (Dec 11, 2008 1:39 pm) and 2 more...
#67 of 106 Re: problems with a 2008 gmc sierra 5.3 [misswench] by rednecktroy Sep 28, 2008 (4:15 pm)
Replying to: misswench (Sep 26, 2008 10:29 am) Go to post #46,Mechanic can not reproduce the problem,Lets just wait till someone gets killed,I think gm should take the problemed trucks back.
#68 of 106 Re: valve lifter noise [natesms] by rednecktroy Sep 28, 2008 (4:27 pm)
Replying to: natesms (Jul 31, 2008 6:18 pm) Your lifters are losing prime have them replaced,but keep your ear on them
#69 of 106 Re: 2007/2008 Sierra Active Fuel Management Problems [gmax6] by tafid Oct 06, 2008 (4:43 pm)
Replying to: gmax6 (Apr 23, 2008 5:39 pm) I thank you for that info, but I send you the same question I have been asking sense 300miles, now at 30k.   RPM/Engine Surge: When easing to a stop or after stopping and slowly rolling (by easing off brake, no throttle apply) into my garage, the engine speed will increase surging the vehicle forward. It does not matter if the engine is cold or warm, nor driving for one minute or one hour. The engine speed will increase up to ~1000 rpm or more. The engine speed will surge and slowly come down to ~600 rpm in less than 15 seconds. This problem does not occur all the time, but I can bet on it happening each time I drive    The dealer was told by Chevy Tech Service that it is normal. I can't see it normal to have the vehicle speed increase with my foot on the brake.   Tafid
#70 of 106 Re: problems with a 2008 gmc sierra 5.3 [misswench] by jess20 Dec 08, 2008 (3:09 pm)
Replying to: misswench (Sep 26, 2008 10:29 am) I bought the sierra 1500 5.3 and the problem gets worst, my is doing it oround 65-73mph that vibrasion is driving me crazy, its getting to the point that I have to let of the gas pedal because it just keeps doing it for miles. Replies to this message: obyone (Dec 08, 2008 3:14 pm) jess20 (Dec 09, 2008 4:43 pm) Beefnutz (Dec 09, 2008 5:45 pm) jess20 (Dec 11, 2008 1:39 pm) Beefnutz (Dec 15, 2008 5:17 pm) santaman58 (Jan 05, 2009 5:51 pm)
#71 of 106 Re: problems with a 2008 gmc sierra 5.3 [jess20] by obyone Dec 08, 2008 (3:14 pm)
Replying to: jess20 (Dec 08, 2008 3:09 pm) What does the dealer have to say about the vibration? Harmonic balancer? Replies to this message: jess20 (Dec 09, 2008 4:43 pm)
#72 of 106 Re: Maybe this thread is the one I should have posted this in. [doc_holiday [putterca] by mikef15 Dec 08, 2008 (4:47 pm)
Replying to: putterca (Jun 05, 2008 6:46 pm) I have a 08 silverado lt crew cab and would like to add the DIC control. I have taken the small dash panel off from the left side of the dash where the controls should be located, but there is no harness to plug the switches into. Is the plug located in a different location from where I am looking? GM is telling me this is not possible to do. Replies to this message: obyone (Dec 09, 2008 2:10 am) skimm99 (Dec 15, 2008 7:47 pm)
#73 of 106 Re: Maybe this thread is the one I should have posted this in. [mikef15] by obyone Dec 09, 2008 (2:10 am)
Replying to: mikef15 (Dec 08, 2008 4:47 pm) If my memory serves me correctly the LT trim Silverado already has the DIC and is located near the steering column. The upgrade was being performed by owners who had the W/T and LS trim.

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