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3RD FOLLOW UP SQUEAL NOISE

Engine

Vehicle Information: Model: Carrera; Year: 1985; Body Type: Coupe; Engine (type, size, modifications): 3.2 STK; Total Mileage: 127K;

Just to let you know I do have a total of 6 shims. The nut is a little worn. I measured it at 16mm. Is this correct? Can you tell me what the tread pitch is? This would save me some work. New ones are only sold as a $22.xx kit.On a cold start, initially the RPM bounces up, and down a few times between 600 & 1,200 RPM, then settles in @ 700-750 RPM. I figured this was normal due to the sensors needing a little time to adjust. Now with the belt tightened the RPM goes straight to 700-750 with very little fluctuation. Interesting. Do any of the sensors rely on the RPM of the fan?

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