Oh I totally plan to learn this car inside and out like I did my VR4. It's nice that the VR4 is infinitely more complicated than the Viper.
Just trying to sort out if my brother was full of crap, haha. For now I don't mind using a GPS to track speed. I need something, especially driving it 450 miles back home. Luckily three other guys are going with me to share in the Viper driving duties.
License plate ideas? VIPRE is available. It's the anti-virus software my IT firm peddles. Or is that too ridiculously nerdy. Gahhh why can't it be Saturday? :-)
I use GPS for speed every time I drive the viper...I don't use the speedo. I get that you want to fix it, but once it's in your garage, you'll be wanting to do a lot more to it. My Service Manual explains the Vehicle Speed Sensor on the transmission and the Wheel Speed Sensors. Get one for your '95.
The speedo gauge just flings to and fro, even with the key on accessory, vehicle stationary. I can use a GPS to track my speed, that's not the end of the world, but I don't like to just leave things broken if they can be fixed.
Originally Posted by shifty556
Speedo doesn't work. Constantly sweeping up and down. This alarmed me. Happened with engine off and key turned to ACC.
Those are your key symptoms, and they confirm to you that the speedo is electric, not cable driven. I can't picture a scenario where the speed sensor would cause this. It generates pulses based on detecting the moving "teeth" of a tone ring on the turning trans output shaft. I don't see how it could generate pulses if the shaft is not turning. So, either the PCM circuitry is screwed up, or the Speedo receiver circuit is screwed up, IMHO. Since the speedo shows some corrosion, I'd go there first, myself.
I don't mean to be a care-bear. I just got conflicting information on this particular part. The fact that it does it on accessory does clearly point to an electrical problem.
The car runs like a top (I'm not just telling myself that to make myself feel better). It pulls ridiculously hard, it's very clean inside and out minus the bubbling paint on the dash and the rash on the bottom of the front bumper. The engine bay is crazy clean, I still need to post pics. The idle, as stated, needs a little help or the car will die. I was told a few pages back that it may be that the throttle cables aren't sync'd up to have the driver side engage before passenger side.
I'm going to bank on it being a bad speed sensor. If it's a bad PCM, that'll come into the light soon enough and I'll deal with it. Can get it rebuilt or go with AEM, right? We'll see...thanks again, guys.
Fair enough, I definitely have some research to do.
I'm definitely expecting to run into expenses with this, much like I did with the VR-4. Trade-off is that the Viper will break fewer times, I'm sure, but cost more per fix. I'm prepared for that. I'll run it until any other symptoms pop up. If the PCM is bad, more stuff is bound to happen. I went through 3 pcm's on my VR4 because of leaky capacitors, so I'm not stranger to that. Thankfully the Viper is much simpler than that car...
I still am worried about the odo not being accurate.
*edit* My service manual is on the way from eBay. When I get the car I'll dig that sensor out and inspect it. Wires may be in a bad state, sensor may be wrecked, PCM may be to blame. I'll keep you guys updated. Pics in following post.
Last edited by shifty556; September 12th, 2013 at 02:23 PM.
I may be wrong about the speed-o being gear driven... may be earlier models? Or it may be gear driven and then electric from a sensor behind the Speed-o in the dash. Some research and hands on debugging should reveal the design.
If you do have PCM problems, I replaced my Gen I PCM on my 94' RT/10 back when I had it and got a new PCM from Chuck Tator for about $400 or $500. A little high but could be worse. You won't want to get into AEM or anything like that and like mentioned, I don't think AEM supports early gen Vipers.
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