2002 S-10 4.3 - one lifter tapping on startup - WTF?

Well you have it documeted now so when it's out of warrenty and it's still not fixed, GM should be liable to get it right.

BTW: We've noticed on newer GM trucks with the v-8's that they will actually knock--like in crankshaft knock--when started back up, hot, after a

15-minute resting. AND, we've seen them still knocking at well over 100k on the odom. And, no, the M-M-Oil won't help that!

Bad lifter. Slightly out of tolerance, leaks down, doesn't re-seal quickly enough on startup, blocked by a bit of grit... who knows.

That hydraulic lifters, when properly working, don't need any lash adjustment. Just like millions of other hydraulic lifter engines.

Could this have anything to do with the fact that many manufacturers now recommend 5w-30 oil to be used, instead of good ol' 10w-40?

You must be using piss-poor oil filters, the cheapo ones (like the Fram's) have poor anti-drainback valves, and when the engine is hot and you shut it down, the oil all runs back into the pan. Try a Purolator and see if the problem goes away.

Ted

anyone ever use diesel fuel as engine flush before changing oil? Someone told me to try it. I use engine flush on every oil change. He's a farmer and uses diesel fuel to flush every engine he owns before an oil change. Just curious. Btw, my S-10 has a pinging and knocking too, but I think its just piston slap, it sounds just like a 6 Liter when you first start it till it warms up.

IMO, it's a good way to destroy an engine. As long as you change oil regularly, there should be no need for any sort of flush... waste of time an money not to mention contributing to excessive engine wear and clogging up oil passages.

Yes, cleaning stuff is bad. That's why I never clean my underwear. The skid marks in my shorts add to the longevity. You shouldn't clean .22 rifles either, it will destroy the accuracy.

GMC Greml> >

"GMC Gremlin" floridly penned in news:dY7td.1044531$ snipped-for-privacy@bgtnsc04-news.ops.worldnet.att.net:

Don't clean your black powder guns either, otherwise you'll miss that cool "potholed road" effect you'll get in the barrel.

Over the three years that I've owned the truck, I've run Purolator, AC Delco, Fram, and Autozone's Proline. No difference in behavior with these filters, and they've all been completely full of oil when it comes time to change the oil.

RM

And make sure to never wipe a gun down with oil... acid-etched finger marks are a good thing.

GMC Gremlin

Cleaning really dirty stuff *too fast* is bad...

now if the engine looks clean inside (pull a valve cover) go for it, but if it's all sludgy and nasty you are rolling the dice with an engine flush... take it easy with the harsh stuff... maybe try switching to a high detergent oil like Rotella or something instead of the flush

nate

GMC Greml> Yes, cleaning stuff is bad. That's why I never clean my underwear. The skid

4.3 its Bullet-proof.