No voltage movement on TPS

Speedy

Speedy

Club Member
I've been dealing with this Mustang when I get time and I'm still not getting it running right. Still idling high. I tried to adjust TPS voltage but it was at 4.85 volts. Max voltage is said to be 4.84. Any how I need to be at .98 - .99 key on not running, I'm at 4.85 to 4.90 and can't get any change in the reading. I bought a new TPS think the old one was bad but the new one is doing the same. Any ideas? Runs and drives great just idles real high

TIA
Mike

It's a 1991 5.0 that I'm working on
 
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dave89iroc said:
what does it read unplugged?
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What exactly do you mean "unplugged" the TPS unplugged from the harness? I did have a bad ground from the harness to the block. It was to short to go back on the block so I put it on the firewall. Is that acceptable? I still have the same issue though.
 
Speedy said:
What exactly do you mean "unplugged" the TPS unplugged from the harness? I did have a bad ground from the harness to the block. It was to short to go back on the block so I put it on the firewall. Is that acceptable? I still have the same issue though.
Click to expand...
That ground needs to go to the engine.
 
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