'97 Camaro tacometer anomaly - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Electrical
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 01-15-2010, 10:27 PM
Turbo-CBX's Avatar
Ugly, Filthy, Discusting!
 
Last photo:
Join Date: Mar 2008
Location: Florida USA
Age: 65
Posts: 33
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
'97 Camaro tacometer anomaly

I wired a 1997 Camaro instrument cluster to a '70 GMC powered by a 454 with typical Delco HEI distributor. The Tac gets its signal from the standard HEI Tac signal lead. The Tac works fine until it hits 3,000 rpm. With the engine still accelerating, the Tac stalls momentarily at 3,000 followed immediately by it dipping to around 1000-1500 rpm. Once the actual rpm drops below 3,000, the Tac needle comes back up and works fine until I again hit the 3,000 wall.
Is the Delco distributor (coil mounted on the distributor) Tac signal power pulse overdriving the tacometer? All connections are solid so I've already looked at a loose connection. Anyone else experienced the same problem?
Thanks

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 01-16-2010, 01:08 AM
sqzbox's Avatar
My pipes are my music
 
Last photo:
Join Date: Sep 2009
Location: indiana
Age: 64
Posts: 2,938
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
I had the same problem with my aftermarket tach when a hot wire shorted across the wire to the dist. from the tach melting into the wire and grounding it out killing the engine. Ain't been right since.
Sounds like yours has an internal problem.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 01-16-2010, 05:38 AM
Jake_Dragon's Avatar
Member
 

Last journal entry: New Carb
Last photo:
Join Date: Jul 2005
Location: Central Florida
Age: 49
Posts: 771
Wiki Edits: 0

Thanks: 2
Thanked 2 Times in 2 Posts
Sounds like you lost one of the coils inside the tach
It uses coils to swing the arm by pulling on a magnet. Coil gets destroyed and the tach quits working.

You will probably have to replace the tach.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 01-16-2010, 09:02 AM
Turbo-CBX's Avatar
Ugly, Filthy, Discusting!
 
Last photo:
Join Date: Mar 2008
Location: Florida USA
Age: 65
Posts: 33
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Appreciate the feedback/troubleshooting ideas

Appreciate the quick responses. They give me a direction to look at. Guess the tac anomaly is what I get for buying the used cluster on-line--guess the old phrase still applies, "you get what you pay for"
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 01-16-2010, 11:06 AM
Jake_Dragon's Avatar
Member
 

Last journal entry: New Carb
Last photo:
Join Date: Jul 2005
Location: Central Florida
Age: 49
Posts: 771
Wiki Edits: 0

Thanks: 2
Thanked 2 Times in 2 Posts
I wonder if you could have it fixed

A quick search found

http://www.modulemaster.com/en/servi...build_info.php

Description: This rebuild is for a 1999 Camaro but covers all years with similar looking clusters. Restores full functionality of gauges and lamps.

Vehicle: Chevy Camaro
Price: $85
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 01-16-2010, 12:12 PM
Turbo-CBX's Avatar
Ugly, Filthy, Discusting!
 
Last photo:
Join Date: Mar 2008
Location: Florida USA
Age: 65
Posts: 33
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Good Idea--thanks!

The cluster cost me a total of $25 as an EBay purchase so the cost-benefit is a definite factor. I really like the way the gauges look (I'll upload a photo) so the desire to have it repaired is a consideration. Thanks for the website!
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 01-16-2010, 11:28 PM
Bryan59EC's Avatar
Car? Truck? Who Cares
 

Last journal entry: First week of December
Last photo:
Join Date: Jun 2006
Location: San Antonio, Texas
Age: 54
Posts: 2,329
Wiki Edits: 0

Thanks: 1
Thanked 14 Times in 12 Posts
I believe they have hi rpm and low rpm modes.

The tach in my 79 Chev C-10 (factory) will not read below 1200 once that point has been reached.

if I start the truck and am able to start and keep it at idle or under 1000 it will read okay. But once I get going, it will not read below 1200 until I shut the truck off and restart it.

Higher RPM reads just fine
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 01-17-2010, 08:09 AM
Turbo-CBX's Avatar
Ugly, Filthy, Discusting!
 
Last photo:
Join Date: Mar 2008
Location: Florida USA
Age: 65
Posts: 33
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I guess our newer gm gauges are not made in Japan

Sorry to learn you have similar problems with your TAC. Maybe that's why there are so many inexpensive used instrument clusters available on-line...
Reply With Quote Quick reply to this message

Recent Electrical posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pinging on 03 Chevy 5.3 Engine in Suburban bry21317 Engine 42 10-02-2011 07:35 PM
Camaro projects for sale... Zartan General Rodding Tech 30 12-12-2008 11:01 AM
95 Camaro engine swap torqjunki Introduce Yourself 1 12-18-2004 11:45 AM
Yep! I'm new 2.... Pro-Touring a '67 Camaro L8model Introduce Yourself 6 12-09-2004 12:30 PM
78 camaro to t top 87 monte carlo help isleofwight Engine 3 06-28-2004 09:29 PM


All times are GMT -6. The time now is 12:23 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.