'94 IDI factory turbo Questions!

[powerstrokes only]

Just bought a '94 7.3 factory turbo with an automatic trans., it runs great but has two little issues I don't understand and need help with. First the tach sits on 0 until I start accelerating and then it works fine, and seems to be accurate, it just doesnt respond while just at idle. Second, every once in a while while I am driving, whether I have overdrive locked out or not, when I let off the accelerator the overdrive light starts flashing until I accelerate again. Do I have a speed sensor going bad? Trans. still operates normal even when this happens, maybe nothing to worry about, just wondering. Any advice would be appreciated! Thanks!

[94OilBurner]

I don't know much about the tach problem, probably a sensor. As far as the OD off light blinking, my 94 IDI non-turbo would randomly flash the OD off light and this would put the tranny in limp mode and firm up the shifts so much it shook the truck when shifting. I also noticed my brake and ABS lights on. After a little research, I found that the ABS sensor mounted on the rear axle was the main cause for this. Replaced the sensor ($12 at NAPA) and all was good again.

[Bamfster]

When the O/D light flashes it means there is a trouble code with the trans. It will need to be read with a code scanner to find out what the code is/means.

[powerstrokes only]

Thanks guys, I really appreciate the help, now I have somewhere to start!

[powerstrokes only]

Originally Posted by 94OilBurner

I don't know much about the tach problem, probably a sensor. As far as the OD off light blinking, my 94 IDI non-turbo would randomly flash the OD off light and this would put the tranny in limp mode and firm up the shifts so much it shook the truck when shifting. I also noticed my brake and ABS lights on. After a little research, I found that the ABS sensor mounted on the rear axle was the main cause for this. Replaced the sensor ($12 at NAPA) and all was good again.

I got a new ABS speed sensor and my blinking overdrive off light problem is gone!!!!!!! Thanks for the help!!!!

[94OilBurner]

Originally Posted by powerstrokes only

I got a new ABS speed sensor and my blinking overdrive off light problem is gone!!!!!!! Thanks for the help!!!!

Good to hear!

That will be $100