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Thread: throttle response when hot

  1. 4th February 2010, 07:15 PM #1
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    throttle response when hot

    I started this on in the Disco 1 forum but I guess it should have been here instead.

    http://www.aulro.com/afvb/discovery-...ml#post1173885

    It was suggested I check the TPS, do I have one I'm on petrol?

    Any chance of those lovely mods. shifting it for me
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  2. 4th February 2010, 08:40 PM #2
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    I don't want to hijack thread, but I have similar symptoms on a manual Td5 D2. Motor misses/doesn't run smoothly on light or trailing throttle, hot or cold, but very smooth when you accelerate. It also has a slight miss at idle. Didn't think it was TPS as there's no 'driver demand' fault code. Easy fix if it was that - $170 and straightforward fitting...
    Always looking for creative new ways to get bogged... :whistling:

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  3. 4th February 2010, 09:32 PM #3
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    Quote Originally Posted by black betty View Post

    It was suggested I check the TPS, do I have one I'm on petrol?
    Throttle Position Sensor: It's an EFI V8, they all do from '86 on. Like I said, its just where the air enters the engine, facing the front of the car.
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  4. 4th February 2010, 09:37 PM #4
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    Quote Originally Posted by bee utey View Post
    Throttle Position Sensor: It's an EFI V8, they all do from '86 on. Like I said, its just where the air enters the engine, facing the front of the car.
    Thank's bee utey, I was looking though the Haynes manual and it only mentioned TPS in the diesel part.

    If I just pull the old one off and get a new one are they difficult to set up right?
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  5. 5th February 2010, 08:34 AM #5
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    Firstly find its connector plug, its round and has 3 wires. Dismantle the plug to see if its terminals are clean and tight. To test a TPS you need a digital multimeter. The voltage in the harness side red wire, TPS plugged in, ignition on, engine not running, should vary smoothly from about 0.5 volts at idle to under 5 volts at full throttle. I don't have the exact figures, according to my reading of RAVE it shouldn't matter. Until you have checked its operation and connection, its pointless to replace it.
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