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Gullible
4th February 2010, 08:15 PM
I started this on in the Disco 1 forum but I guess it should have been here instead.

http://www.aulro.com/afvb/discovery-1/97881-funny-throttle-response-when-hot.html#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:angel:
feraldisco
4th February 2010, 09:40 PM
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...
bee utey
4th February 2010, 10:32 PM
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.
Gullible
4th February 2010, 10:37 PM
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?
bee utey
5th February 2010, 09:34 AM
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.