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96 F150 5.8 High Idle... and I've replaced everything! Please help!

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Old 11-30-2011
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My TPS looks like the one in the video.
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Old 11-30-2011
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Latest findings:


With the TPS removed from the throttle body, and still plugged in to the harness...
at rest: 0.5 VDC
wide open: 5.0 VDC

At 0.5 VDC, the scan tool thinks it is at 10% open.
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Old 11-30-2011
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I am going to assume that if the TPS reads 0.5 VDC at rest, then it has to be good. I don't know why the scan tool reads 10%.

I'll hook it all back up and see what happens with the idle...
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Old 11-30-2011
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I had to file the TPS mounting holes in order to get the minimum setting of 0.5vdc.

The TPS just wouldn't rotate any more closed.

I hooked everything back up and checked the scan tool.... the TPS still reads 10%.


I started her up.... idle started around 1800 and then ramped down to 850.


It sounds normal now.



What an ordeal!!!



My advice to anyone having a high idle problem: get a scan tool and check your TPS open %. Anything more than 11%... adjust your TPS.



Thanks to all who contributed!
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Old 11-30-2011
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Sounds like a pain in the rear!
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Old 11-30-2011
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Sometimes its the littlest of things, that cause us the biggest grief! Glad to hear you got it fixed.
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Old 12-01-2011
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Glad it's fixed Deet!
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Old 12-03-2011
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Still working properly!

That scan tool is really helpful.
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Old 12-03-2011
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Originally Posted by DEET
Still working properly!

That scan tool is really helpful.
they are certainly worth having,i have one that can do up the 05 model year and i can update it to do the 2010 or 11 models.i can do my older Fords with it as well.
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Old 11-10-2018
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Originally Posted by DEET
The ECT (Engine Coolant Temperature) sensor... is it the same one that drives the instrument panel gauge? Or are there two different sensors?

The instrument panel gauge never gets above medium (normal) temp.



Update....

In digging around on the internet, it looks like there are three sensors. An air tem sensor mounted on the air box, a gauge temperature sensor mounted on the manifold, and the ECT mounted near the thermostat.

I'll have to verify that tomorrow. Hopefully, there is a test to determine if the ECT is good...
Did you ever get this fixed?
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