1990 Oldsmobile 88 Speedometer short

Tiny
LAZARUS4
  • MEMBER
  • 1990 OLDSMOBILE 88
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 150,000 MILES
Recently has an 80K engine put in. Since then I've had intermittent operation of the speedometer while driving. I replaced the VSS since I was also replacing Cam and Crank sensors as well.

My speedometer still fluctuates randomly.

Where should I next check? I'm guessing somewhere in the harness.
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Friday, December 18th, 2009 AT 10:21 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
If you replaces the VSS, chances are the cluster itself is the problem. It was common for them to short.
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Friday, December 18th, 2009 AT 1:28 PM
Tiny
LAZARUS4
  • MEMBER
Thanks for the insight. My logic is:
The speedo only started acting up after the new engine got put in. When it works is acts like a very touch wire connection (which of course could be the cluster) What I was sort of hoping to do was get a harnass diagram check to make sure that all the connections are solid, before I start pulling out the dash.

So, Does the feed to the Speedo come from the computer directly? Is there a connection that I can check to ensure proper installation?

Tks
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Friday, December 18th, 2009 AT 2:50 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
I have a copy of the schematic, but you will need to enlarge it to read it. Here is what you are looking for. From the VSS, there are two wires, a purple one and a yellow one. Both go to the ECM numbers B9 and B10. From the ECM, number B11, a signal is sent to the speedo through a dark green wire. A red wire, B12, is for the cruise control. Here is the schematic. I hope it helps.


http://www.2carpros.com/forum/automotive_pictures/249084_vss_2.jpg



I hope it helps and you can enlarge it. Looking at it as a map, go to B-5.5.

Let me know if it helps or if you have other questions and thanks for using 2carpros.com.

Joe
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Friday, December 18th, 2009 AT 11:22 PM

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