1994 E350 runs better with TPS unplugged
Senior Member
Joined: Jun 2010
Posts: 16,584
Keep in mind a Ford MAP sensor cannot be checked by voltage readings. It works on a frequency basis. You can only verify 5 volts is getting to it with KEY on.
There are only 2 other components that share that 5 volt reference voltage, one is the TPS and the other is the EGR position sensor.
A good visual inspection would include making sure all ground connections are CLEAN and tight.
Have you tried disconnecting all 3 , then connecting 2 at a time and see what you get?
If one of them has a grounded signal circuit , that would need to be verified by voltage drop testing.
There are only 2 other components that share that 5 volt reference voltage, one is the TPS and the other is the EGR position sensor.
A good visual inspection would include making sure all ground connections are CLEAN and tight.
Have you tried disconnecting all 3 , then connecting 2 at a time and see what you get?
If one of them has a grounded signal circuit , that would need to be verified by voltage drop testing.
Junior Member
Joined: Apr 2023
Posts: 7
From: Maryland
My '94 E350 feels like the TPS is bad - runs rough at idle and feels like its misfiring driving down the road. The check engine light is not on. Was having these issues on a road trip and I didn't have the means to test the TPS so I just replaced it and still having the issue. With the TPS unplugged though it runs WAY better. It idles high but doesn't cut out at idle or when driving down the road. When I got home I tested the new TPS and it appears that the sensor itself is working fine. Any thoughts on what would cause this and not throw a CEL code?
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