How can I tell if my air control valve is leaking?
Remove a vacuum line and connect it to a vacuum gauge to measure the level and consistency of the vacuum. You can also try spraying a soap and water mixture on the lines to look for bubbling at the point of a leak. Take note if the check engine light comes on.
What happens when you idle the air control valve?
Normally, if you just start your car, the idle air control valve will cause the engine rpms to increase and slowly decrease. That would be a sign that your IAC is working.
What does the auxiliary air valve do on a Jaguar?
The Auxiliary Air Valve (AAV) serves the same purpose on the Jaguar V12 with EFI that a high idle cam serves on an engine with a carburetor: it raises the idle so the engine won’t stall when cold. It consists of a thermal bulb, outwardly similar to the bulbs found in thermostats, that pushes a piston up a cylinder against a spring.
How old is a V12 engine strip and rebuild?
The youngest of these carbs is now ~20+ years old, so their general exterior condition is likely caked in oil and garbage, also components of the linkage may be rusted & worn. However, the best thing to do is get in there and pull the thing to pieces, it all needs cleaning anyway.
What are the problems with a V12 heater?
As far as the source of heat is concerned, there are two main likely problems: Any kind of coolant leak-sealer is a major problem, because it seals up the heater matrix where there is often trapped air. Sealants work by solidifying when they encounter air, usually at a leak. We have examined this problem previously.
Can a jet be removed from a V12 engine?
Turning the unit over, the float bowl cover can be removed, then the float unclipped and the needle valve unscrewed. Jets are normally a hard push-fit and should only be touched if a replacement is at-hand. Adjustable-jet versions were made, but I’ve never seen one.
What causes a V12 heater to become clogged with rust?
Keep your V12 cooling system in tip top condition. On occasion, the heater can become clogged with rust as a result of the system not having had fresh antifreeze or corrosion inhibitor frequently enough.