Loses Power After 40 Minutes
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Join Date: Jan 2012
Location: Newport Beach, California
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#6
it slows down, I shut the engine for 10 seconds turn it back on and the jag. runs okay for another 30 minutes or so, help.
Thank You, Eddie.
#7
do this, until I get home, plan to see a jaguar mechanic this week, lets see what he tells me, 40 years ago I restored Corvettes,
from the 60's, not anymore. Thank You, Eddie.
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#11
Could be an aging fuel pump. Just spit balling, but the next time it stalls and won't immediately restart, try this:
1) Lift the front edge of the rear seat a few inches
2) Move the ~5 inch rubber plug beneath the rear seat to access the fuel tank
3) Sit in the driver's seat, reach behind and place one hand on the top of the fuel tank
4) With the other hand, turn the ignition key to the run position for ~15 seconds. Not the start position, just the run position to light up the dash and energize the electrical system.
5) Each time you turn the key to the run position, your hand on the fuel tank should feel soft vibrations of the fuel pump energizing for 3-4 seconds to pressurize the fuel rail. If you don't feel soft vibrations, then the fuel pump is not energizing, there's no fuel pressure, and the engine won't start. Time for a new pump.
An aging fuel pump can work properly for a while, intermittently fail, then work properly again (until the next intermittent stall). At ~120K miles, the pump in my X-Type always worked reliably on 5-15 mile trips, but failed once or twice a month during my 40 mile workday commute, typically ~30 miles into it. After a few minutes "resting" on the side of the road, the pump worked fine again for the last ~10 miles of the commute. Rather frustrating, since it fails without warning, it's not easy to access the pump in our X-Types, and you want to be certain before investing the effort and cost to replace it.
1) Lift the front edge of the rear seat a few inches
2) Move the ~5 inch rubber plug beneath the rear seat to access the fuel tank
3) Sit in the driver's seat, reach behind and place one hand on the top of the fuel tank
4) With the other hand, turn the ignition key to the run position for ~15 seconds. Not the start position, just the run position to light up the dash and energize the electrical system.
5) Each time you turn the key to the run position, your hand on the fuel tank should feel soft vibrations of the fuel pump energizing for 3-4 seconds to pressurize the fuel rail. If you don't feel soft vibrations, then the fuel pump is not energizing, there's no fuel pressure, and the engine won't start. Time for a new pump.
An aging fuel pump can work properly for a while, intermittently fail, then work properly again (until the next intermittent stall). At ~120K miles, the pump in my X-Type always worked reliably on 5-15 mile trips, but failed once or twice a month during my 40 mile workday commute, typically ~30 miles into it. After a few minutes "resting" on the side of the road, the pump worked fine again for the last ~10 miles of the commute. Rather frustrating, since it fails without warning, it's not easy to access the pump in our X-Types, and you want to be certain before investing the effort and cost to replace it.
Last edited by dwclapp; 05-01-2015 at 07:55 AM.
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