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Old 05-24-2010, 06:29 AM   #1 (permalink)
DRV
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Default Throttle Position Sensor Replacement

Hey all, I purchased my car with 99k on it and recently completed the replacement of all belts pulleys, water pump, thermostat, plugs and coolant and cleaned the throtte body. I thought that possibly that would fix an issue I have seen since I bought the car.

The problem
When I get in traffic I notice the rpms will just start rising on their own and if I rev the engine they will drop down to 2k. Which made me think it had something to do with the ECU. Also when I let off the gas it can lerch at times and if I just leave it in first and let it roll it when almost rock back and forth.

I was speaking to someone and they mentioned it could be a bad throttle position sensor. Does anyone have any suggestions.

Many thanks
-Dan
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Old 05-24-2010, 11:40 AM   #2 (permalink)
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Is it possible to have a bad TPS without the car throwing a check engine light?
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Old 05-24-2010, 12:39 PM   #3 (permalink)
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I had a bad TPS on my 2001 Subaru Outback without a check engine light. Make sure to check your grounds to the TPS if you are going to replace it. That ended up being the problem with mine and I ended up going through two TPS's before I found out. The check engine light will come on if the voltage is to high or too low to the unit. If you are going to replace it yourself, a good volt ohm meter is necessary to measure the correct voltage. I believe the Outback I had was between .45 and .55 volts or something like that. Make sure to double check that though, it has been a while since I replaced one. Good luck.

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Old 05-24-2010, 06:57 PM   #4 (permalink)
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Thank you for replying back to me. I did some research on the TPS for the 2.5L and they are stating in two sources like you said .45 volts at wide open throttle and .5 at idle. I guess my question is being that I had this problem since I bought the car at 99k is it possible to have a working TPS that just needs to be adjusted? I have never replaced one in a car and correct me if I am wrong but if I purchased a new one I would have to adjust the idle and WOT settings as well. The cheapest I found for an OEM was $197 and I found a couple used one's on ebay for $40 to $50 dollars. When you replaced yours did you purchase yours from a dealer.
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