Speedodometer 1990 C4 Help!
Thread Starter
5th Gear
Joined: Apr 2009
Posts: 5
Likes: 0
From: Middleboro Massachusetts
Speedodometer 1990 C4 Help!
Recently replaced heater Core (What a #@%*ing nightmare!) double checked all connections before closing up dash. BUT! now speedodometer stays @ 0. Instant average is flashing between 0 and Sys. Everything is plugged in. Has anyone ever run into this before? Need direction on where to start looking not looking forward to ripping out dash again!
Thread Starter
5th Gear
Joined: Apr 2009
Posts: 5
Likes: 0
From: Middleboro Massachusetts
No codes- rechecked all my connections in dash all o.k.
Cruise Control not working either-connection is good.
Do you know anyone that has ever had to replace a speedometer signal generator? because I'm suspect that this could be the problem.
Cruise Control not working either-connection is good.
Do you know anyone that has ever had to replace a speedometer signal generator? because I'm suspect that this could be the problem.
1st Gear
Joined: Aug 2007
Posts: 1
Likes: 0
I have a 91 and the same thing happened to me when I replaced the Speedometer sending unit. They make two different ones for our car, one you can find and the other you can't. The solution for me was to remove the unit from the mount and spin it 180 degrees and re-mount it in the bracket. Somehow the worm gear isn't making contact with the fiber gear and spinning it around makes the connection.
Safety Car
Joined: Oct 2008
Posts: 4,689
Likes: 4
From: Yucaipa CA
try pushing in on the that thing with the buttons for fuel information. My 90 trips sometimes and when I press on that everything works again, If that dont fix it maybe no vss signal from the trans of the internal buffer in the ecm is bad.
