tach is way off

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Jul 17, 2008 | 05:10 PM

lexusgui

Thread Starter

Joined: Jul 2008

Posts: 1

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From: Kokomo, Indiana, USA

tach is way off

i have a 1990 honda prelude si 5spd and my problem is that the tach will read 2000 rpm at idle and will only move up to 2500 while driving barley moves at all. with key on engine off the tach will move up to aprox 800 rpm. any help would be great thanks.

Jul 20, 2008 | 10:09 PM

vtecb18c

Honda-Tech Member

Joined: Mar 2008

Posts: 2,156

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Re: tach is way off (lexusgui)

make sure the tach is calibrated for a 4 cylinder...some tachs use chips for 4,6,and 8 cylinders

Jul 27, 2008 | 07:47 PM

h23siaws

Honda-Tech Member

Joined: Nov 2007

Posts: 83

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From: chesterfield, va, usa

Re: tach is way off (lexusgui)

i had problem my tach when it wasnt revving right. i replaced my dizzy. sometimes the gears on the inside of the dizzy go bad.

Jul 27, 2008 | 07:54 PM

Chris F

Senior Member

Joined: Jun 2004

Posts: 10,399

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From: Chicagoland, IL

Re: tach is way off (lexusgui)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lexusgui »</TD></TR><TR><TD CLASS="quote">with key on engine off the tach will move up to aprox 800 rpm.</TD></TR></TABLE>

I think it has to be a bad tach. No way that a distributor can do that.