'94 IDI factory turbo Questions! - Ford Powerstroke Diesel Forum
7.3L IDI (Non-Powerstroke) Diesels Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

 
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post #1 of 6 Old 11-26-2007, 07:12 PM Thread Starter
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'94 IDI factory turbo Questions!

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!

Fletcher
'90 F250 Supercab IDI 7.3
Banks Sidewinder Turbo
4'' straight pipe
116,000 miles

'94 F250 single cab IDI Factory Turbo 7.3
3'' banks down pipe
Banks pyrometer
3 1/2'' straight pipe
K&N Air filter
Hypermax air intake
Hydrogen Generator
Pump turned up
Timing advanced
315,000 miles!



'89 F250 4x4 supercab 7.3 IDI
4'' exhaust
pump turned way up!!!
297,000 miles
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post #2 of 6 Old 11-29-2007, 01:40 PM
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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.

Derek
94 F-350 IDI DRW 4x4 Dump Truck
Now where's that fuel pump screw...
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post #3 of 6 Old 11-29-2007, 01:58 PM
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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.
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post #4 of 6 Old 11-29-2007, 04:26 PM Thread Starter
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Thanks guys, I really appreciate the help, now I have somewhere to start!

Fletcher
'90 F250 Supercab IDI 7.3
Banks Sidewinder Turbo
4'' straight pipe
116,000 miles

'94 F250 single cab IDI Factory Turbo 7.3
3'' banks down pipe
Banks pyrometer
3 1/2'' straight pipe
K&N Air filter
Hypermax air intake
Hydrogen Generator
Pump turned up
Timing advanced
315,000 miles!



'89 F250 4x4 supercab 7.3 IDI
4'' exhaust
pump turned way up!!!
297,000 miles
powerstrokes only is offline  
post #5 of 6 Old 12-15-2007, 12:17 PM Thread Starter
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Quote:
Originally Posted by 94OilBurner View Post
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!!!!

Fletcher
'90 F250 Supercab IDI 7.3
Banks Sidewinder Turbo
4'' straight pipe
116,000 miles

'94 F250 single cab IDI Factory Turbo 7.3
3'' banks down pipe
Banks pyrometer
3 1/2'' straight pipe
K&N Air filter
Hypermax air intake
Hydrogen Generator
Pump turned up
Timing advanced
315,000 miles!



'89 F250 4x4 supercab 7.3 IDI
4'' exhaust
pump turned way up!!!
297,000 miles
powerstrokes only is offline  
post #6 of 6 Old 12-16-2007, 05:22 AM
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Quote:
Originally Posted by powerstrokes only View Post
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

Derek
94 F-350 IDI DRW 4x4 Dump Truck
Now where's that fuel pump screw...
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