1988 Jaguar XJ-S 5.3 liter V12 coupe - My XJ-S will drive fine until it warms up. After it warms up, it will only go 37 mph...anything over that and the engine misfires and wants to die. I can press on the accelerator gently and it will reach about forty, but if I press any harder the engine dies, unless i let off a bit and it will go back to about 40 mph. It also kind of has a hard time starting that is related to the misfiring problem...It will turn over but not start. after a few times it will start and idle. Could this be related to a tune-up, temperature sensors, or 02 sensors? Anything would help! Thank you.
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www.jaguarforum.com/showthread.php?t=54266 Mar 3, 2013 - I recently bought a 1993 6.0 V12 XJS and when it is started from cold it runs ... to 1300 RPM so it wants to surge forward when braking which is strange. ...Classics · XJS 3.6,4.0,5.3 & 6.0; 6.0 V12 XJS High RPM When Warm ... You might want to adjust the aux (extra) air valve to bring the idle speed down.
The XJ 40 DOES NOT have a compliance plate as it is the first year they were owned by a American company Ford. The XJ 40 better known as the XJ 6 was fords experimenl change over. This went on from 1988 to 1994 and with every year you will find different things they changed that were problems with the preceding year . like the 88 & 89 had digital dash boards that failed a lot to hard wiring breaking so on 90 they changed that as well as a engine upgrade
68-88nm Steel Wheel
88-102nm Alloy Wheel
Figures represented as printed in manual.
--- This is for Jaguar XJ12, Also badged Double Six - sure its the exact same car, its built 1997-1997 its a 6 Litre V12,
Hello! Your symptoms tell me that you likely have a catalytic converter issue. When the converter becomes clogged, you will experience a significant loss of power and torque. This is often, but not always; accompanied by the smell of rotten eggs, another tell-tale sign of a converter issue.
You need to check a service manual on this but it sounds a bunch like a cold-start valve isn't closing once the engine is warm and this would cause an overly rich fuel-air mix that would gag a warm engine.
I don't know if your car is equipped with one or not.