Question about 1986 Jaguar XJSC

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'88 XJ-S Misfiring When Warmed Up

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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Have you tried a new coolant sensor?it is poss it is telling the ecu its still cold so its chucking more fuel through. also get a block tester and test cylinder head

Posted on Dec 23, 2008


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