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fast idle speed screw, works off the fast idle cam which the choke adjustment sets, it works together by linkages. This is the raised idle speed setting you need to keep a cold engine running. First you set the idle speed by the idle speed screw with engine at normal operating temperature. Then you set the linkage up so the cam is on a raised step, throttle will be held on that raised step. then you can turn the idle speed screw to get idle at about 1500-1800 rpm. Now when you start engine cold, choke will set the fast idle cam on that raised step- when engine starts and runs it should be running at your fast idle setting. That's how it supposed to work, you just have to get everything adjusted right. I hate carburetors, they never stay adjusted right. Considering their complexity and small mechanical parts, no wonder.
the Jaguar does not have a electronic water poump, only the x350 xjr has a auxilary coolant pump for the supercharger.All x350 xj8 models have a conventional water pump.
Can't adj..clean your IAC. Idle Air Control valve, or possibly replace it. The Computer adj's you idle by this valve moving in and out, it gets carboned up and does'nt move like it should.
sounds like the torque converter is going out...I remember on some of the xj8 and xjr models in the x350 class had these issues...the signs were a surge in the rpm cluster at about 50mph and when you attempt to pass or kick down it will ****....but as you get higher in speed it eventually smooths out...This is my insight for your issues...If it was the transmission control module it would throw a definite code.....Usually this issue with the converter was with the earlier vin models ranging in g00 to g400 numbers....and a few others
if it is a v12, and at idle when warm if it goes up and down then you need to rebalance the throttles, they are off balance causing the idle to raise and drop.
set the butteryflys behind the air cleaners to 2 thousands of an inch using a fella guage and make sure the linkage arms from the pedestal in the middle of the engine are set the same (one is not longer than the other)
JPTCAT
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