Rpm Guage 2003 Trailblazer


Old 07-15-06, 09:37 PM
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Join Date: May 2003
Location: WRIGHTSVILLE GA. 31096
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Rpm Guage 2003 Trailblazer

can someone give me advice on this problem.
2003 trailblazer v6 vortec
rpm guage will be at 7000 rpms when only going 20 mph or it may be at 5000 when idling & 4000 rps when engine is shut off.
the guage will sometimes jump back & forth but no difference in way engine runs.engine runs good as it did whenrpm guage was working correct.no problem with engine at all.will set all day & rpm is still at 4000 to5000 thanks for any advice.
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Old 07-16-06, 07:59 AM
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The instrument panel cluster receives a signal from the PCM in order to display engine speed. You really need a scan tool to check displayed engine speed to be sure...but the likeliest culprit is the instrument panel. I doubt the malfunction is elsewhere since you stated everything else seems to function properly and the vehicle drives fine.
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