Tach
Thread Starter
Drifting
Joined: Oct 2006
Posts: 1,328
Likes: 14
From: Stafford Connecticut
Tach
My Tach is reading wrong.It will go to 3500 RPM then stay there or drop.My scan tool reads 4500 RPM and climbing when this happens.Any ideas of what would make this happen. could the tach readings on the dash effect my computer in the Vette.Once again the tach readings are right on the scan tool.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Tach filter maybe?
http://forums.corvetteforum.com/c4-g...1990-vert.html
Tacho is display only ,ECM gets RPM from different source so no connection between the two.
http://forums.corvetteforum.com/c4-g...1990-vert.html
Tacho is display only ,ECM gets RPM from different source so no connection between the two.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Thread Starter
Drifting
Joined: Oct 2006
Posts: 1,328
Likes: 14
From: Stafford Connecticut
Tach
Thanks guys I'll get one I hope that's the problem.Looks like an easy fix.I'm glad to hear it's display only and doesn't effect the running of car.
Last edited by steven mack; Dec 8, 2011 at 05:59 PM. Reason: add info
Race Director
Joined: Feb 2003
Posts: 16,475
Likes: 270
From: Kingman AZ
Cruise-In VII Veteran
Cruise-In VIII
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
What year is the car? 90 and 91 are known for this problem and a new tach filter does not usually fix the problem.
The fix is done by repairing the tach portion of the instrument panel.
At work now and do not have access to my home computer files.
Maybe a search here will help you out.
The fix is done by repairing the tach portion of the instrument panel.
At work now and do not have access to my home computer files.
Maybe a search here will help you out.
Thread Starter
Drifting
Joined: Oct 2006
Posts: 1,328
Likes: 14
From: Stafford Connecticut
Well I decided to check the connections to my Tach filter.I didn't know the wire from the distributor to the other end of the filter was a blade connector fitting.So I unplugged the fitting to look for corrosion then plugged it back in.The Tach works fine now.Sometimes you catch a break working on these cars. Thanks for the link rodj.
Last edited by steven mack; Dec 9, 2011 at 02:47 PM. Reason: add info
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