High speed sound that sounds as though something is hitting a fan,or a main bearing that has gone
I have a 2002 duramax GMC. I was driving down the highway and this sound occured, it only lasted about 3 seconds and happened 3 times on a short hour trip, twice on the way there and once on the way back. No visual effects were noticed as a result of the sounds, all guages remained the same and no lights came on. I just had all injectors replaced, the front diff out to change a seal,all shocks changed,intermeadiate shaft replaced and an exaust leak fixed the day before. Before all this work was done I never heard this noise before ????? Any Ideas anybody. Thanks in advance
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Hi Jim, If the vehicle is fitted with climate control it will have electronic management. However it can be wired by someone knowing electrical circuitry to by pass the control. It will save you some cash but will need manual control. Make sure whoever does the job knows what he or she is doing. Have a happy new year. Regards John
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.
If its not the brakes then it could be a wheel bearing. Jack it up and spin the wheel. Listen for noise. If it has lots of miles or possibly been driven in high water at some point the bearing could need to be replaced. You should get it fixed and don't wait too long.