Thanks - the gear is still attached but the speedo only works when it wants to and will flip on and off at will.
The "Rally Computer" shows input from the ECM, VSS, Ignition Switch, Lights, Battery, and Fuel Gage. The ECM connection is labled "for MPG". It sounds like it's some type of fuel economy thing.
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02:24 PM
fierohoho Member
Posts: 3494 From: Corner of No and Where Registered: Apr 2001
If the wires look good at the sender I would maybe wiggle or un-plug and plug in the main connecter at the instrument cluster a couple times which requires removing the bottom and top trim pieces, sounds like a loose or poor connection.
Steve
[This message has been edited by fierohoho (edited 07-14-2007).]
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04:52 PM
jscott1 Member
Posts: 21676 From: Houston, TX , USA Registered: Dec 2001
2. What is a "Rally Computer" that is stock to a Fiero? Where can I get one? Where dose it mount? My 86 service manual has the wiring guide for it.
I have never heard of such a thing.... Do you have access to a scanner to show the wiring guide for the rally computer? I would be interested to see what it is.
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05:10 PM
ARKaiser Member
Posts: 1305 From: lansing,michigan,usa Registered: Feb 2003
I have never heard of such a thing.... Do you have access to a scanner to show the wiring guide for the rally computer? I would be interested to see what it is.
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07:26 PM
ARKaiser Member
Posts: 1305 From: lansing,michigan,usa Registered: Feb 2003
If the wires look good at the sender I would maybe wiggle or un-plug and plug in the main connecter at the instrument cluster a couple times which requires removing the bottom and top trim pieces, sounds like a loose or poor connection.
Steve
I even put in a new speedo pack and no change.
After the engine warms up it acts better then when cold but still it will cut in and out without any cause that I can detect.
I have a spare tranny but they snapped the top off the VSS when they removed the engine. I was hoping I could find one at the junk yard off another car. Most of the time they will let me have things like that for a buck or two.
I have never heard of such a thing.... Do you have access to a scanner to show the wiring guide for the rally computer? I would be interested to see what it is.
I am thinking that somewhere along the way, the Fiero was supposed to have one of those trip computers that told instant mileage, average mileage, distance to empty and stuff like that like the same era Corvette. That is probably what they are considering the 'rally computer'.
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08:12 PM
KurtAKX Member
Posts: 4008 From: West Bloomfield, MI Registered: Feb 2002
I am thinking that somewhere along the way, the Fiero was supposed to have one of those trip computers that told instant mileage, average mileage, distance to empty and stuff like that like the same era Corvette. That is probably what they are considering the 'rally computer'.
Maybe it never made it to production, kinda like how the 88 Fiero Helm manual has power steering info in it.
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10:39 PM
jscott1 Member
Posts: 21676 From: Houston, TX , USA Registered: Dec 2001
Maybe it never made it to production, kinda like how the 88 Fiero Helm manual has power steering info in it.
That must be it... I've never heard of a Fiero actually having a Rally computer, and having never looked in the 86 book I didn't know it was there. If someone out there actually has a rally computer it would be worth a lot seeing how rare it would be.
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10:48 PM
Jul 15th, 2007
Mickey_Moose Member
Posts: 7549 From: Edmonton, AB, Canada Registered: May 2001
cool, I just looked in my 85 FSM and it doesn't even have that page - mine just goes from the cluster page (8A-80-11) to the wiper/washer page (8A-90-0). You must have one of the earlier printing of the manual.
Any chance of getting a hi-res copy of them? You have peaked my interest.
[This message has been edited by Mickey_Moose (edited 07-15-2007).]
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11:28 AM
PFF
System Bot
jscott1 Member
Posts: 21676 From: Houston, TX , USA Registered: Dec 2001
Does anyone know of an aftermarket device that performs the function of the rally computer? I know they used to sell such devices, but I imagine now it would be OBDII or otherwise difficult to install. But I would like to have something like that in my Fiero.
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02:47 PM
Jul 23rd, 2007
ARKaiser Member
Posts: 1305 From: lansing,michigan,usa Registered: Feb 2003
I am still needing an answer to my question on the VSS. I hope to go to the junk yard soon and would like to pick one up there so that I can test mine.
Also I talked with an engineer this last weekend that worked on the Rally Computer. It was going to be a true Rally Computer and not just a trip computer. The ECMs for 87 are equipped with the needed software but GM decided not to go on with the project. Thery were doing it for a California company that was going to supply the computers. GM was worried about the future need to supply airbags and since the computer was to be mounted in front of the passenger on the dash that left no place for the airbag. He doubted that any of the computers made it past a proto type and that none would be around today. He did say that if he came across the name of the company he would get it to me.
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