Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

Slow speedometer

Thread Tools
 
Search this Thread
 
Old Jan 18, 2018 | 09:23 PM
  #1  
Claudioa's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2017
Posts: 70
Likes: 0
Slow speedometer

The speedometer in my 91 Trans Am is acting up
Sometimes it doesn’t work for like 10 miles ..........
Needle just doesn’t move then just starts working
Odometer is also not regestering like it should.....
It’s turning slower than normal........
Is this a cable driven speedo or electronic...??
Thank you
Reply
Old Jan 19, 2018 | 03:42 PM
  #2  
RBob's Avatar
Moderator
iTrader: (1)
 
Joined: Mar 2002
Posts: 18,432
Likes: 233
From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Re: Slow speedometer

It is an electronic speedometer, no cable from the transmission.

If it is a TPI the ECM buffers the VSS and sends it on to the speedometer. If TBI there is a 4-out buffer box to do this.

RBob.
Reply
Old Jan 22, 2018 | 07:11 PM
  #3  
Claudioa's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2017
Posts: 70
Likes: 0
Re: Slow speedometer

What would cause it to work and not work or work slower than normal....??
Thank you
Reply
Old Jan 22, 2018 | 07:29 PM
  #4  
Tuned Performance's Avatar
Sponsor
20 Year Member
Community Builder
Community Influencer
Community Favorite
iTrader: (94)
 
Joined: Dec 2004
Posts: 16,734
Likes: 993
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Slow speedometer

Bad vss or ecm .
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
rarebmx
History / Originality
14
Apr 14, 2015 06:27 PM
rob1ta
Tech / General Engine
4
Aug 12, 2008 12:20 PM
mach158
Transmissions and Drivetrain
1
Jun 28, 2002 08:30 AM
Federico
Tech / General Engine
9
Sep 11, 2001 05:20 AM
Joseph Andres
Aftermarket Product Review
5
Apr 21, 2001 12:47 AM




All times are GMT -5. The time now is 08:47 AM.