Greg MFn Z

I have a 01 Vert for Sale. Has 90K and hella piston slap. Everybody thinks its knocking and they do not believe me when I say its normal in alot of GM engines. I want to temporarly quiet it down. HOW?????

tiojames

Only why I know to quieten piston slap is rebore with new pistons.

motogib1

The slap seems to go away after the engine warms up. I just ignore it.

FRCTony

Perhaps you can point them to this site so they can see it is normal.

Greg MFn Z

Did you even read my post?????

Greg MFn Z

I thought about that, and I may try it, but thats still a tough sale.

lucky131969

How do you propose to make up for a disparity in piston to cylinder bore tolerance? Have to just let her warm up, things expand, noise dies down. I guess you can make sure the engine is good and warm before a prospective buyer comes over. An educated C5 buyer should know the difference, but no one wants to try to listen for potential issues over the din of piston slap, when they are considering the car for purchase.

dieseldave56

Owners of LS1/( & '01 LS6 engines )have complained to GM since 1997 about cold start piston slap or knock anomaly. It is not a durability issue, according to GM. But the issue was addressed with the addition in May of 2001 on the LS1 to the 2001 M/Y production line with a revised piston that decreased the dimension between the piston and cylinder wall plus the addition of an anti friction polymer coating on the piston's skirt. ( This was also added to the LS6 M/Y production line in mid April of 2001).

The noise should go away as the engine reaches operating temperature.

vettenuts

While a pain, I would think you are better off being honest about it rather than covering it up only to have the new owner find it later after the sale. I just gave my Pontiac Grand Am to my neice's husband that had piston slap since new in 1994. Well beyond 200,000 miles and still runs like a raped ape. Only thing you can do is tell the buyer that it is typical of the motor manufactured within a time window and hopefully you will find someone who knows this to be the case.

vsocks1

Not a good idea to try and cover it up for the sale!!

Quicksilver Vert 01

I'm in total agreement with the others. Trying to cover up the noise, and not being honest about it, will more than likely come back to bite you in the a$$.

Greg MFn Z

I agree with you all and thats what I have been trying to do but IT WONT GO AWAY(meaning it won't sale!). So how is something suppose to bite me in the a$$ when it doesnt go away in the first place!!!!!

SUNNYD 95

The best thing to do is be honest and tell the "buyer" its normal and it won't hurt anything.
Honesty is the best policy

c-5-steve

As I see it you have 5 options

1. fix it. (you will never recoop your money with this one)

2. Trade it in to a dealer

3. lower your price

4. keep the car

5. take it to an auction


It's tough out there right now many people are having trouble selling thier vettes for a good price.

itzza427

While mine does not have SERIOUS slap,it is noticeable. I have made some cold morning observations that you can pass along. I placed the DIC on oil temp,,and have noticed on mine that it starts to go away when the OIL temp reaches about 80 degrees,,and is pretty much gone in a few more degrees!! Oil temp is a little more accurate indicator of the piston/block relative temperature. Try it yourself on the next few fullly cold motor starts and check it out. Then you can tell them to just drive easy to that point. There are motors out there with 100s of thousands miles that have done it from day one. Since most vets are driven in nice weather it is not a big problem for the wait!! On 18* mornings 80* takes a bit longer!!

Quicksilver Vert 01

If I wasn't clear enough the first time, I'll say it again more plainly.

Any attempt to TEMPORARILY QUIET IT DOWN, in order to make a sale,
is DECEITFUL.

bobby777

If its that loud--i suggest its excessive slap and youll have to fix or knock the price down--no one wants to buy any car with any motor noise--maybe trade it in at your chevy dealer

JJS04

And karma is a beotch!

jovette

It's NOT normal in LS1 engines that are warmed up. If the piston slap only occurs when the engine is cold, suggest you copy / print the GM service bulletin that addresses this issue, and show it to prospective buyers.

bobby777

Take the car to a rough part of town--park it with the window down and the extra key in the ign.--walla your worries are over unless you dont have insurance