Question about 2002 Chevrolet TrailBlazer

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Car revs higher than normal at about 30mph even though in top gear and tachometer doesn't show abnormally high reading.

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You may have a defective tachometer gauge stepper motor, making the tachometer show incorrect RPMs.

Posted on Oct 12, 2010

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When you rev the engine and does not go over 3000 rpm is this in neutral or when driving in gear? Some vehicles have a rev limiter to not allow rpm over certain point when in neutral gear but is typically not limited when driving vehicle. This sounds like a very low rev limit but not abnormal if you can get engine to rev higher when driving. You call a drifter so truck must be non US market. Is this engine a 2.5 liter diesel 4 cylinder motor. Might just be your top rev and speed if this is the case.

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