sethsyoter

I have valves rattling when i go up hills and put strain on my little 22r and my other yota didnt do this, what can this be, btw i already changed fuel filter, and tune up wires plugs etc... it is carbed and got 98k miles

4runnerlougas

could be that your rocker arms need to be adjusted or that the adjusting screws are worn however the valve tap should ocure at idle as well if thats the case i kinda wonder if perhaps your cam bearings are worn causeing the cam to ever so slightly shift under load hense changing the clearances between your cam lobes and your rocker arms perhaps???? rather unlikly but i would deffinatly remove your rocker cover and check your clearances

4runnerlougas

oh and don't count on me being right lol it valve clearances was just the first thing that poped into my head lol good luck buddy

sethsyoter

its like the engine is pinging, i dont really think its the valves ticking. i am just used to calling it rattling valves. But im pretty sure its pinging.

1stgen4gunner

wow thats really low milage, very lucky.

sethsyoter

yeah it was a find, most around here in ga. have 300 to 400 k, but i did shell out 4g on it but imo its worth it!

annoyingrob

What's your timing set at? It's possible that someone advanced it a bunch, and now it's pinging under high load.

highway

x2
also try a little octane boost and see if that helps any at all. ....if not check the valves.

abecedarian

since you're carb'd, it's also possible that the jet(s) are partially clogged in the carb or that the carb baseplate gasket is worn or the carb is not torqued down on the manifold, any one of which could cause you to go lean with the throttle opened up wide and start detonation.
but I'd start with a quick timing check and set first to see if the problem goes away.

sethsyoter

what is the optimal timing setting if there is one?

annoyingrob

IIRC, stock is 5 degrees (with vacuum lines off of the distributor), but most people advance it up to 10 or 12.

camo31_10.50

m timing is advanced to 8*...runs fine..but i have an exhaust leak somewhere.and as soon as my truck cools down...im gonna find it.(i have an idea of what it is now.)

SevenO22R

okay, comment from a ASE mechanic IE Me. It is sparl knock, timing is too advanced A. Or you need to use 93 octance that will stop is. All engines will detonate(pinging) with too much timing advance or improper grade of fuel. A build up of carbon in the cylinders from running 87 or 89 octane has happened or is happening, it's causing your pre-ignition(pinging). Has nothing to do with your rocker adjustment not when your hearing the pinging under a load, improperly adjusted rockers will rattle at all times and only get noisier as rpms increase.