So recently bought a 1997 GMC Sierra, before I bought it I noticed a intermittent chirp/squeak while driving. I told the seller and he said that he thought it was the serpentine belt, so he replaced it. When I came back to buy the truck, no squak, problem solved right? Wrong. The chirp came back after doing some highway driving and is accompanied by a momentary loss of acceleration/power.
Take the belt off and check all the pulleys, something is seized (alternator, AC compressor, waterpump or belt tensioner) causing the belt to slip, what makes the noise.
Would that also account for the momentary loss of acceleration/power while driving? Most of the pulleys have been replaced, only the tensioner itself hasn't.
I dont know much about engines but im thinking maybe the momentary loss of power is because the belt is slipping which isnt letting the engine out power down? I really dont know but thats what comes to mind
Definatly the tensioner chirping. Loss of power is coincidence. Your belt only runs accessories, battery runs computer which runs the electronics. Alternator charges the battery. Test your battery for proper voltage and charge and check connections. Also check ground straps to see if any are loose. That could interrupt power distribution and cause power loss momentarily.
Sorry, to clarify 'loss of power' I mean an actual loss of throttle coming from the engine? I replaced tensioner and problem has stopped but was replaced by a new one where there is always a 'whirring' sound when engine is reving.
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