My '76 XJ12C is having cold start difficulty. I first thought it might be related to the AAV, but when removed I discovered it was open as it was cold, and of course because it was in my hand, I heated up the bulb to see if it would move. I used a heat gun for the inaccurate quick check and indeed the valve closed quickly/easily.
My next thought is the water temperature sensor for the ECU. I can’t find my books because I moved and have many boxes of books unopened, but I know there is a chart with a range of resistance as temperature changes. So I thought, probably easier to just purchase a new one. I believe the part number is C42166, but I can’t find them. Is there a substitute Bosch part number or Jag part number?
Thanks, Charles Rahm in Dallas, TX