Tach Bouncing - 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 09-23-2006, 05:24 PM
crusherdbuzz's Avatar
71 Chevrolet Nova
 
Join Date: Mar 2006
Location: Norco, CA
Posts: 73
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Tach Bouncing

I just installed my new sports comp monster tach 5" with shift light. Under WOT the needle will bounce around 3,000 and then will restabalize around 4,000 rpm. The main problem with this is I am running a shift light. When it bounces it sometimes fires the shift light by hitting the 5,000rpm shift set I have. I don't like this because I sometimes run my car hard and don't want to do a false shift. The other time I notice the needle bouncing is when I completely let off the pedal it will also bounce. Anyone run into this problem and know the remedy? I know it has something to do with the signal it is receiving from the hei terminal.

Other relavent information: 71 nova, 350 engine with 4spd manual trans, hei ignition.

Appreciate the read and replies,
Dennis

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 09-23-2006, 08:04 PM
docvette's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Rebuild an alternator Last photo:
Join Date: Mar 2004
Location: Lafayette, california
Age: 62
Posts: 7,362
Wiki Edits: 12

Thanks: 0
Thanked 6 Times in 3 Posts
Doc here,

What TYPE HEI? GM or aftermarket..

Doc
__________________
Aftermarket Solutions
Electronic & Electrical
Innovations
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-23-2006, 11:59 PM
crusherdbuzz's Avatar
71 Chevrolet Nova
 
Join Date: Mar 2006
Location: Norco, CA
Posts: 73
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The main body of the HEI distributor is red and there is a mallory sticker under the hood. However, the cap says Delco-Remy. So I am not entirely sure, but I am hoping the description helps lol. I didn't put the HEI in so I can't say for sure. I hope that helps.....

Dennis
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 09-24-2006, 01:22 AM
docvette's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Rebuild an alternator Last photo:
Join Date: Mar 2004
Location: Lafayette, california
Age: 62
Posts: 7,362
Wiki Edits: 12

Thanks: 0
Thanked 6 Times in 3 Posts
Doc here,

What one does it more resemble?



This one ?



Or this?

Doc
__________________
Aftermarket Solutions
Electronic & Electrical
Innovations
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 09-24-2006, 10:03 AM
crusherdbuzz's Avatar
71 Chevrolet Nova
 
Join Date: Mar 2006
Location: Norco, CA
Posts: 73
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I would have to say the first one. I say that because of the way the base of the distributor looks compared to the second one. Mine is flat like the first one not like the angled cone of the second.

Dennis
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 09-24-2006, 06:37 PM
docvette's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Rebuild an alternator Last photo:
Join Date: Mar 2004
Location: Lafayette, california
Age: 62
Posts: 7,362
Wiki Edits: 12

Thanks: 0
Thanked 6 Times in 3 Posts
Doc here,

OK, If it is the top..It's Stock GM...and only Good to about 5500 RPM before it takes a nosedive...And 4000 RPM , under module heat / Stress might cause it to "Act Up " a bit there..

The Performance HEI is good to About 8500 RPM before it runs like crap in a can..

My First piece of advice is pull the tach wire (and shift lamp) and hook up a Shop tach, and try to duplicate the problem..If you can't , one or the other (Tach or shift lamp) is headed for the happy hunting ground..IF you can...

Then verify the RPM range is accurate..AND If so, have the module and coil checked..at auto zombie for free, SEVERAL times, Full load, to heat it up good..see if it is thermally breaking down..

If you need either..BE sure you have them tested BEFORE you leave the store as well..Fail rate out of the box is very high..and once you leave .. it's your problem...

Try that, and let us know the results..

Doc
__________________
Aftermarket Solutions
Electronic & Electrical
Innovations
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 09-24-2006, 06:56 PM
crusherdbuzz's Avatar
71 Chevrolet Nova
 
Join Date: Mar 2006
Location: Norco, CA
Posts: 73
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Sounds good doc, I will try the shop tach tomorrow and just snap the throttle with the car parked because it duplicates the same thing now and will let ya know what happens. I've owned the car over a year and a half and have never done anything to the ignition system. Would it be a good idea to get an msd or petronix HEI upgrade kit and use it on that? I really hope it isn't the tach as the tach is brand new.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 09-24-2006, 08:31 PM
docvette's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Rebuild an alternator Last photo:
Join Date: Mar 2004
Location: Lafayette, california
Age: 62
Posts: 7,362
Wiki Edits: 12

Thanks: 0
Thanked 6 Times in 3 Posts
Doc here,

Well, Maybe for Street and better economy ... If you want to put the money into it..

But from what you describe..and Not knowing anything about the engine..sounds like it 's bone stock..and an HEI (Stock GM) should perform for you just fine..

Because it say's 10,000 on the face plate..doesn't mean you need try to reach it.. Especially if you don't have the rest of the engine to support it..(like a performance lower end for starters..heads, and induction..)

Think about it..Just how many times are your EVER going to reach 5500 RPM?? Not that many in a DD.

Choice , Of course , is yours..but to begin with..I'd invest it elsewhere first.

Doc

Wow!! Got blown off the site at 5:45 PM Ca local time..from overload..just now getting back in..7:30 Ca local...Thats special...
__________________
Aftermarket Solutions
Electronic & Electrical
Innovations
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
Sun Tach 383vette Electrical 6 12-30-2011 02:21 PM
Tach cool rockin daddy Electrical 3 09-22-2006 04:12 PM
OER tach cool rockin daddy Electrical 2 09-01-2006 02:28 PM
Tach Problems thecrowx Electrical 3 07-09-2006 04:05 PM
mustang tach wiring stang_steve Electrical 0 07-14-2004 07:28 PM


All times are GMT -6. The time now is 04:27 PM.


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.