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If you want to do some further testing on the TPS
http://oldfuelinjection.com/?p=30
Lots of good stuff there.
Do you notice a difference by opening the throttle at the throttle body v mashing the pedal? I realize it’s hard to look at a scan tool while under the hood. Maybe get a buddy to help you do one or the other. If you see a difference between manually opening the throttle at the throttle body and smashing the pedal, look at your throttle linkage.
Edit: I didn’t read the last two sentences of your post, so I’m guessing you have checked the throttle cable. Have you looked at the throttle body itself to see if there is a big build up? I know it’s a stretch, but cleaning the throttle body up and making sure it operates free and clear is where I would go next.
I think the problem is your testing as the TPS reading does not have to be 0V, it can be between 0-1V at closed throttle, admittedly 1V is a bit high but you get the point. In addition engine load has nothing to do with the TPS that’s actually a reading taken from the MAP sensor since that’s the sensor responsible for measuring engine load. Considering your readings were the same after replacing the sensor I would say the TPS is not a problem and you should look elsewhere. Given also that you don’t have a check engine light for these parts I don’t think it’s a good idea to replace things that don’t code as they probably aren’t bad.
Generally I don’t replace parts like that, but I got the part dirt cheap at the junkyard while there getting parts for my Astro. Just seemed to me that the TPS reading should read 0 on my meter, as it’s read 0 on every other car I’ve worked on, so that threw up a flag for me. The MPG had gone down on the Explorer so I started to go through some of the basics ( replaced the air filter, checked for loose connections, bad vacuum lines, etc ) and then looked at the scan tool to see what I was getting for Live Data readings, which is where I found that I had a slow O2 sensor and the TPS value and “load” reading. I know that the MAP shows the load on the engine, and there is always going to be a reading of a few percent, but 13 seemed a bit off as I’m used to seeing 3-5% on my scanner.
I’ll do some more checking of the actual throttle area to see if I have something gumming it up…give it a good spray with some MAF cleaner and see where we get with that. This unseasonable 45 degree weather in MN at Christmas time is just another present that I should be taking advantage of.
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