1st Generation S-series (1983-1994) Tech Discuss 1st generation S-series (1983-1994) general tech topics here.

RPMs OFF

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Old Oct 16, 2011 | 05:44 PM
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Talking RPMs OFF

Hi again, can someone tell me why the tach is showing more rpms than it really is. At idle it is showing 1700 and at 55mph it is showing 4200rpm. I figure is is about 1000 hi. The trans is perfect. TY for any help.
88s10 Blazer, 4.3 TBI, auto, 4x4 219,000 miles.
 
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