2002 Silverado rough idle at start up

[Supreme Pizza]

In an attempt to eliminate the suspected piston slap, I have tried everything. Nothing fixes it.

 

The only surefire way I have found to fix the piston slap is:

 

You guessed it - a block heater.

 

The engine is already warm, so there is no 10-15 seconds of slap.

 

Only problem is that if you use too powerful of one, it can vaporize some of the coolant and cause the engine temp sensor to act up (from the "air pocket").

 

 

 

 

[Jsdirt]

"Chatters like a diesel" and "missing a cylinder" are not terms I'd use to describe piston slap ...

 

Need more info from the OP ...

[Swimmer8366]

Could be an injector leaking down after it's been sitting....mine does that....could be intake gasket as others have said. Could be bad plugs....could be regulator leaking down. Could be a lifter. Could be many things need more info.

 

Sent from my Z981 using Tapatalk

[Supreme Pizza]

I guess we will just have to wait and see.