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Old 04-21-2009
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Ohc question

Well i put in the an ohc a while ago but my temperature is never right. It is wired to Johns directions the only thing i dont have wired up is the speed wire because i dont know what to hook it too even when my truck has been sitting all day and i just turn the key its not right its colder than what it is out.

Anyone know what might be wrong with it?


Thanks

Cam
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Old 04-21-2009
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I know in a stock OHC in my mom's car it takes 15 min for the temp to be right... not sure if it's the same with these??
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Old 04-21-2009
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The speed wire has to be used. I tells the temp display that the truck is moving.
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Old 04-21-2009
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Old 04-21-2009
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^^What he said....that speed sensor HAS to be wired up in order to get a proper temperature reading. It's all about mathmatics that are computed in that OHC circuit board....takes speed, temp sensor, puts it in a formula, to determine accurate temperature, then sends it to the display.
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Old 04-21-2009
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Quote:
Originally Posted by Redrocket View Post
that link doesnt help me at all i dont have a GEM in a 94


Shane i was told that it wasnt needed b4 but maybe it is so i guess i have to wire it up.


So what do i wire it too
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Old 04-21-2009
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You have a mechanical speedo right? If you do then you are pretty much SOL. Maybe you can run power to it but I don't know how well it would work.
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Old 04-21-2009
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If you have cruise control there's supposed to be a speed wire for that. We're putting one in for a BroncoII someone on another forum said it'd work.
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Old 04-21-2009
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someone on here with a 94 did it. i cant think of his name but he has a light blue truck and just bought an f150 too and lives in new york
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Old 04-21-2009
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I think that guy just ran 12 volts to the speed wire.
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Old 04-21-2009
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there is a blue wire if i remember correctly that runs down to where the speedo gear is and goes into this little box could i use that?
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Old 04-21-2009
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Mine works perfect in my 94', can't remember if I hooked up the VSS wire or not, I thought I did.
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Old 04-21-2009
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can you look into it and see what you hooked it too
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Old 04-21-2009
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the wiring that john has directions for isn't the same wiring as yours is it?
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Old 04-21-2009
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it is till the gem
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Old 04-21-2009
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the wiring will still be different tho right?
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Old 04-21-2009
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no why would it be
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Old 04-21-2009
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Old 04-21-2009
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might help ya...

Quote:
Originally Posted by rwenzing View Post
Connect the gray/black of the console to the gray/black of your truck. For 1993, you can find it at the PCM or the speed control amplifier. If you don't connect it, you may have problems with the temperature display not updating correctly.
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Old 04-21-2009
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bc they are different generation of rangers. pretty sure they changed the wiring. not 100 percent sure tho
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Old 04-21-2009
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well shane quoted it
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Old 04-21-2009
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Quote:
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might help ya...
so it is still the gray/black wire.
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Old 04-21-2009
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i guess but its on the pcm
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Old 04-21-2009
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I don't have a 1994 schematic but it should be electrically identical to the 1993. Gray/black at the PCM, at the Speed Control Amplifier or at the VSS signal Generator on the transfer case (or anywhere in between).
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Old 04-21-2009
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is the vvs the blue wire that is running alone the speedo cable?
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