When I accelarate it stops but at idle it's loud
Heat shield covering manifold.
SOURCE: Rattling noise 1994 Tempo
its the harmonic balencer. is it particularly bad when its in neutral
SOURCE: Noise under intake manifold
best thing to do is to take the intake and valve covers off, its possible you may have inadvertently sucked something up and it's in you intake. That is the best solution.
No telling what it is until you take things apart and take a look. It shouldn't be too hard, make sure you get new gaskets, gaskets are cheap anyways.
SOURCE: rattling from under hood starts when a/c is engaged or veh in idl
When the a/c is turned on it puts more of a load on the engine, and causes it to pull harder, which in turn, can cause some vibrations that are otherwise not present. It is possible that the a/c compressor is going out, but not likely if it is only 4 years old. I advise you to take a broom handle or something similar, about 2 to 3 ft long and touch the end of it to the a/c compressor when the rattling is occurring, at the same time, place your thumb over the other end of the pole and stick it to your ear. This is a really good listening device to help locate rattles and knocks. Be sure to put your thumb between the pole and your ear so you don't hurt your ear, and also be EXTREMELY careful not to get the pole caught in any of the moving parts. eg.... pulleys and belts. I have an idea that it might be a heat shield or clamp somewhere that has either loose or rubbing against something.
SOURCE: 1994 Tempo when in Park or Neutral the idle goes really hig
replace the ics idile control sensor
SOURCE: 1993 tempo 2.3L...it makes a rattling noise at
pcv valve should do that: that stops the ventilation)(when you put your finger on it), so the car dies.<p>
the balancers don't always go out; but with a weak cranshaft they will. I'd let someone else check your engine you trust.
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