lamont1 wrote:
>
> hello, i just replaced a broken timing belt, the car started right up
> after the belt replacement but now i get a rattling sound from the engine
> when i accelerate under load, i never hear anything when im idling or
> when i rev the engine in neutral, i only hear it when im accelerating.
> im thinking after chaning the belt the timing is too far advanced plus,
> i did fil the tank with 89 octane before the belt broke. could somebody
> please tell me if valve problems create constant chattering sounds even
> in neutral or do valve problems become more pronounced during
> acceleration.
>
> it kind of makes sense that a new belt that isnt stretched like the old
> one would cause the timing to be advanced so im hoping its the timing and
> cheap gas and not the valves.

It sounds like your engine is pinging under load. This can be very
destructive for an engine so I recommend not driving your car until you
solve your problem. The first step is to recheck the mechanical timing.
It's easy to get the timing belt off by a tooth, so be sure to the
mechanical timing is dead on. Next, have you checked the ignition timing
with a timing light once you were finished replacing the timing belt? This
is a standard double check that most techs perform. If everything was ok
before you replaced the belt, then the ignition timing should not change as
long as the mechanical timing is ok. However, if the old belt was off by a
tooth and someone compensated for that by adjusting the ignition timing,
then a correctly installed belt will cause pinging problems if you don't
reset the ignition timing.

Eric