Question about 1991 Pontiac Grand Am

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2.5 tbi sounds like air chisel hitting anvil, very loud, very fast, engine still runs fine. Was intermittent, now constant. engine load does not change sound.

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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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I have a 1988 5.7 gmc that after start up idles fine runs stromg under full throttle but at highway speed and under no load speed it sputters and at slow speed it is running rich i have done complete...


I have a 1988 5.7 gmc that after start up idles fine runs strong under full throttle but at highway speed and under no load speed it sputters and at slow speed it is running rich i have done complete tune up rebuilt the tbi One concern i have is someone removed stock air cleaner system and the one they installed has no intake air sensor could this be the problem ?
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and also i have no codes and no ck engine light on.
There may not be code for a missing part. That system is not perfect.
I hope this helps,
Happy New Year,
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