- #69 of 106
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Re: 2007/2008 Sierra Active Fuel Management Problems [gmax6]
by tafid
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Oct 06, 2008 (4:43 pm)
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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
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- #70 of 106
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Re: problems with a 2008 gmc sierra 5.3 [misswench]
by jess20
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Dec 08, 2008 (3:09 pm)
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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.
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- #71 of 106
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Re: problems with a 2008 gmc sierra 5.3 [jess20]
by obyone
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Dec 08, 2008 (3:14 pm)
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Replying to: jess20 (Dec 08, 2008 3:09 pm)
What does the dealer have to say about the vibration? Harmonic balancer?
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- #72 of 106
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Re: Maybe this thread is the one I should have posted this in. [doc_holiday [putterca]
by mikef15
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Dec 08, 2008 (4:47 pm)
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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.
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- #73 of 106
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Re: Maybe this thread is the one I should have posted this in. [mikef15]
by obyone
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Dec 09, 2008 (2:10 am)
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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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- #74 of 106
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windshield tick,afm lunge
by rednecktroy
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Dec 09, 2008 (7:45 am)
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Has anyone heard a tick in the windshield.55 mph up tick,tick,tick.I have dent in my bumper from the lunge problem (hit a trailer hitch at a local walmart).Lifters are tapping again.I'm about to lose my temper.
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- #75 of 106
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Re: problems with a 2008 gmc sierra 5.3 [obyone]
by jess20
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Dec 09, 2008 (4:43 pm)
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Replying to: obyone (Dec 08, 2008 3:14 pm)
gm said its normal its when it switches from 4 to 8, they are say its the change in exhaust tone, its driving me crazy.
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- #76 of 106
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Re: problems with a 2008 gmc sierra 5.3 [jess20]
by Beefnutz
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Dec 09, 2008 (5:45 pm)
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Replying to: jess20 (Dec 08, 2008 3:09 pm)
well im glad im not the only one, i have an 08 sierra as well and i really didn't notice it until i drove it on a long trip, mostly on the highway is when you notice it, it seems like it does it once you maintain your speed for a little while, your driving and then all of a sudden you hear the vibration and im guessing that means that its in 4 cylinder mode, i HATE it as well it drive me insane. a friend of mine had his turned off and im probably going to do the same i bought a V-8 for 8 cylinders not 4 and to be honest with ya i think it is harder on the engine switching all the time. other than that i love the truck though....lots of space and lots of power(in 8 cylinder mode that is)
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- #77 of 106
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Re: problems with a 2008 gmc sierra 5.3 [Beefnutz]
by jess20
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Dec 11, 2008 (1:39 pm)
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Replying to: Beefnutz (Dec 09, 2008 5:45 pm)
hey can u do me a big favor and find out how d they turn that feture off. I whant to turn it off
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- #78 of 106
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Re: problems with a 2008 gmc sierra 5.3 [jess20]
by Beefnutz
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Dec 15, 2008 (5:17 pm)
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Replying to: jess20 (Dec 11, 2008 1:39 pm)
yeah the thing my buddy failed to mention was that he got his AFM turned off in Florida somwhere...so if you are near then then i can find out more details.........im in north carolina so that won't work for me.....i need to get that junk turned off cuz i can't stand it.....especially when im towing my boat....even in tow haul mode the truck doesn't no theres a big ass boat behind it.....im trying to read up on it as much as possible to find someone local who can do it.....maybe GM can do it prob not though im sure theres some loop hold that will void your warrenty......that being said if you find somewhere that does it let me know...and i will do the same for you
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