Corolla engine problem/noise

[Sam_767]

Hey guys ive just been introduced to this awesome site.

I have a 1989 corolla xl (1.3 carby) with engine troubles. Evry time I give her a bit of gas with the engine under load there is a loud clanging/rattling noise and a lag in the speed. Could this be my valves.

Any help much appreciated.

Cheers,

Sam

[CAP]

It sounds like you're getting detonation / pinging. Check the timing, My 83 Commodore used to do this as a result of Leaded fuel quality being dropped quite dramatically with the change to LRP.

I overcame this by retarding the timing a little and making the car run a little leaner. I lost a little responsiveness but gained fuel economy and the detonation is gone.

Could be a range of other things but this is a good start that wont cost you anything if it works.

[SILVABULLIT]

Run some upper cylinder lube in with your fuel otherwise you will suffer with valve seat recession or worse they'll come loose in the head or you could eventually drop a valve and do some serious damage.