I have Chevy S-10 2.5, top end rattle. Anyone know what this could possibly be?
Low Mileage engine.

ever change your oil?

Plugs, wires, distrubutor cap/rotor?

How many miles we talkin about?

It has 34 thousand miles on it.
Yes the oil has been changed, its not a spark knock or a rod knock or wrist pin.

Originally posted by chrsk
I have Chevy S-10 2.5, top end rattle. Anyone know what this could possibly be?
Low Mileage engine.

Can you be a bit more specific? Saying you have "top end rattle" is very hard to diagnose.

It sounds like the rattle is in the valves or lifters.
It just "pecks" when it idles. Any ideas?

you probably have a rodknock, have you taken it in and had it checked out? And did you say a 2.2L? invest in s 4.3

Just finished replacing an engine in one today. It had a horrible knock from the top end at higher RPM's over 2,000. At idle, it was smooth. The problem turned out to be a bad lifter on #4 intake. With the valve cover off, you could see the valve float and the rocker clearance would get as high as .125".

The customer opted to get a junkyard engine instead of repair and guess what? This one knocks also, but not as bad.

Pull the valve cover off and check the rocker arm and is if any are loose or cracked also check the push rods. The 2.5 had a problem of putting push rods through the rocker arms. They would run good just make a hell of a racket up top.
Fireplug