Question about 1991 Pontiac Grand Am
You mention that engine load does not change the sound. How about engine speed? My guess is that the frequency of the "chisel" sound increases with engine speed.
Has this engine been run without any oil? How much oil is in it right now?
From your description, it sounds to me like a burnt up engine bearing (rod or main, it hardly matters). It could even be excessive wear between a wrist pin and piston or piston slap. In any case, it sounds like you have been driving like this for some time, which means that rebuilding this engine is probably no longer an option (especially if it is a main or rod bearing).
If it is a burnt bearing, you'll probably need to look for a remanufactured or salvage engine. In a '91 GA, unless you find a good salvage engine for less than $500, it probably isn't worth fixing.
That said, I suppose it could be something else.
Posted on Jul 19, 2009
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Posted on Jan 02, 2017
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