Hi all.

My wife has a 99 tahoe (350) vortec 5.7. When starting in the morning or after it sets all day, there is a loud tick sounding almost like a collapsed lifter. Seems after vehicle warms up a little while it stops almost as if it has pumped up. I removed, flushed and changed the oil. It eliminated the problem for a little while and now it is getting cold out and it has started again doing the same as above.

My question is this: Are collapsed lifters a common problem with a vortec? If not, has anyone experienced anything like this?

Any thoughts on this??

Thanks

Andy

 

could just bevarnish buildupor mabe a worn rocker

 

It couldn't hurt to try a can of restore or seafoam. I'm not really a big fan of "liquid cures", but I make an exception with those two products. They seem to do what they claim to do.

 

I have a similar problem if not the same problem and I finally found a solution.
http://www.pistonslap.com/
Hopefully that helps

 

Had the same problem on my 96 5.7L. Went to a heavier weight motor oil to give it a short term fix, but eventually pulled the motor. Worked for about 1 month and then start the embarrassing knocking and ticking. My mechanic advised me that the engine was toast. Wish I had seen this issue on Piston Slap prior to spending money on a new engine or at least, I could have had GM pay for my engine.