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Comments
How can it be normal to have your foot on the brake and the vehicle rpm increase and vehicle surge forward?
The valve clatter will continue but goes away by shutting off the engine and Immediately starting it again. The oil pressure is good and the dip stick shows oil is full.
The noise only happens when the engine is cold or warm. Is AFM in control of the lifters and valves at startup?
Has anyone had this problem?
Thanks,
Let us know if you find out anything.
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
i fix them by squirting sealant under the flaps and letting it dry
it is easy to make a mess but easy to clean up when dry
At the end of 2008 received a court ordered notice from GM regarding a class action settlement on the engine vibration complaint for 1995-2003 all Silverado V8 models.
Recently traded in my 04 5.3 in for an 09 4.8, decided to stay away from the 5.3 for now until they figure out the issue.
Have you figure it out?
I want to take it to the dealer, but I would like to learn a little more about this issue before. I don't trust dealer's tech personnel. I have had very bad experiences with them, leaving me with the feeling that they don't really know their own product very well. Thus, I try to avoid trips to the dealer as much as possible.
HAS ANY ONE FOUND THE PROBLEM
& im just wondering if anyone is having this same problem when putting the vehicle in reverse (from drive only) there is a significant 3-5 sec. delay basically leaving me stranded in the middle of the road on a 3 pointer
i've been to the dealer they updated the flashdrives for motor & tranny etc..
& still does the same thing & as usual its within the GM tolerance haha.
tranny fluid levels are normal & i was just thinking if & i know this sounds out of this world ridiculous the afm has anything to do with it i wanna shut the afm off i think it just effects the total performance of the motor. I've been a long time gm owner & the 04' 5.3L is a monster thats why i stuck with the 5.3
& besides that ticking noise after 60mph the truck is a great truck
oh 1 more thing can the afm be shut off by a tuner & is the hypertech tuner worth it
thanks in advance guys
"i just think afm shouldn't be a option when buying a truck a truck is a truck for power & balls fuel management is for the 4bangers & buy american we gotta keep this country alive & trucks is the reason why "
I am having exactly the same issue with my 2007 Silverado 5.3 (Not Flex-Fuel).
Thanks for your time.
I agree. Soft lifters could actually explain this problem (shaky idle), and reinforcing the theory is the fact that additionally to the shaky idle, my truck has always been affected by another issue, which is definitely caused by soft lifters (since it was 54 miles old). The other issue being: If I left my truck unused for more than two days, when I start it on the morning of the third day the engine sounds like a very bad diesel. Then little by little the lifters recharge and the sound goes away. It does it 3 times out 5 times I leave it unused for more than two days.
I am trying to gather as much info as possible about this issue, its cause, and the solution, so that by the time I take it to the dealer I can “try” to get something useful out of them.