Vehicle & Technical > Freelander

1.8 Misfire... any ideas?

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carbore:
More precicley its the Throttle Position Sensor (TPS) or Idle Air Controll Valve.

Both of these chaps can go awary and could casue ths symptons you describe.

The TPS senses how open/closed the throttle is so could loose calibration, although this supposed to auto reset on ignition (I think). Sometimeit gets dirty, but you may have cleaned this when you did the throttle removal.

The IAC adjusts idle and then obviously backedsout when you drive, this could be sticking.

carbore:
Sorry for not thinking of this before!


--- Quote from: "carbore" ---More precicley its the Throttle Position Sensor (TPS) or Idle Air Controll Valve.

Both of these chaps can go awary and could casue ths symptons you describe.

The TPS senses how open/closed the throttle is so could loose calibration, although this supposed to auto reset on ignition (I think). Sometimeit gets dirty, but you may have cleaned this when you did the throttle removal.

The IAC adjusts idle and then obviously backedsout when you drive, this could be sticking.
--- End quote ---

JC:
Nice one i'll check it out! I can look at the "Throttle Position" via the OBD port, do you know how many degrees it should be on tickover ??.... from memory it reads 3.9...
Cheers for that.

carbore:
Hi,

I dont know the number for the TPS or IAC, I would suspect though, that if for example its reporting 0 it may actually be a bit open/closed and not reporting the correct value.  Am I making any sense?

I think I am trying to say replace with a known good one.  This is something we did on a mates elise, he borrowed my TPS to rule his out, despite having an Emerald ECU whaich says what the TPS reports (if I remember correctly).

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