engine detonating (knocking)

[dcarola]

Anyone out there having similar problems with their Chevy? I've got a 2001 Chevy Silverado, short wheel base, 4.8 engine...and I cant get rid of this problem. I took it back to the dealer, but no such luck. They say it checks out okay. However, they are wrong!
Some other symptoms are a very rough idle along with the knocking. This is a new truck, only 20,000 mi. Im confident that Chevrolet makes a great truck, but want to fix this problem.
I've tried different grades of gasoline, but still...nothing!

My daughters 2001 Tahoe, is having the SAME problem!

Get back with me if you have dealt with this, or have any suggestions.

Thanks.
DC

[twmarsh]

Please advise on the outcome of your problem with the engine knocking. I am familiar with other similar vehicles that began using oil after only a few thousand miles. Also, has your dealer provided you with any paperwork from GM about the known problem? Thank you for your response.

[sembem]

Yes. I have had the same problem. I have a 2002 extended cab with the 4.8 also. Truck has about 18,000 miles on it. I took it back to the dealer just last week about the knocking and they replied that it is "normal" with "these" engines. (Which got my curiosity up) I tried to get some info out of the servce manager, who said some thing about teflon coated pistons being what made the knocking.? As with the previous post keep me in the loop.

Thanks
SEM

[DMC12]

I have knock on my 2001 Suburban's 5.3l so keep me in the loop if anything happens, too. More than likely, it won't get resolved and I'll just end up buying a Jap car next

[jchadwick]

I have a 4.8 as well. Mine knocks and pings has no power, and gets horable gas mileage. I have talked to several dealers in town and they say that it is characteristic of that motor. I will have to have the fuel system cleaned every 20,000 miles and it will still do it. Detroit said the same thing. Has anyone found a fix yet?

[mcontrols]

Yup, I have a 2000 with a 4.8 L and the dealer told me it was a characteristic of this engine.

MC

[jchadwick]

Is there a solution to this problem?

[Flatrater]

GM has been back and forth with this condition right now it is at the point of no repair available! No planed repair at this time but that could change. The new model trucks have been redesigned as far as I been told.

[indyblue]

yeah I've got it too on my 02 silveraado. i love my 4.8 truck, don't get me wrong. i get 25 mpg highway, but she's got a little ping to her. i know a lot of trucks have it, and i'm going to try my luck @ the dealership. I have 22k on it, and have loved every mile. even if they turn me down, i won't go to another truck. after less than a grand of bolt-ons, she smokes the tires right off the line, and the mustang gts look pretty in the rear view. the only cure i've found for the knock is louder pipes. LIKE A KNOCK!

[Romantic911]

Change the igintion leads with new ones (original one's) it will fix that

[indyblue]

Wow. I'll try it. Thanks romatic. Do you recommend any certain brand? Did your pickup have this condition? Thanks again.

[Romantic911]

Yes... i have same your condition and my be worse , use AC delco wires they are the best and please let me know if that fixes your problem

[wierjk]

WOW WOW that works great.... I replaced the leads and gone... gone going.... no more Knocking here... HEA.....

Thanks

[95corsy]

you guys should go to napa or some other place and get this stuff called sea foam. its a gas additive....just pour it in your tank when you fill up. i know alot of people that have said that it works for them (no more knocking, engine runs smoother, etc.). ive also used it in my car too and it works like a dream

[silverado01]

my 01 Z71 knocks so bad it sounds like a rod is going through the oil
pan. I have heard the same as all of you, normal noise etc.