Question about 2000 Jaguar S-Type

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My jaguar s type has had a new fuel filter fitted. but this has not fixed problem.It loses power especially going up hill. we pull over turn off engine for a minute or two, the starts ok for a while. always starts first time every time. seems worse when car is hot. had it in jaguar they could not find fault. would the sensor on the catalyctic converter have any bearing? we had a new accelerator pedal fitted about two yrs ago. no messages appear when this problem happens.When cold and on the flat it flies, goes like a dream.

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Had this problem on a v6 3l petrol. No codes present.Connected laptop to diagnostics and drove jag for a few miles.Found fuel pressure to start off at over 55 psi but slowly drop to 20 psi and less until car came to a halt.
Waited a couple of minutes hey presto car starts,pressure back to over 55psi running fine for a while.tested power supply to fuel pump,ok at constant 12 volt. Changed inline fuel regulator and fuel filter,still the same.Checked fuel tank for any possibility of a vacuum occurring,no not that either.Had to bite the bullet and change the in tank fuel pump,problem solved runs fine.This car had also been to jags and because no fault code appeared it must be alright! I have learnt that over my forty year mechanical experience that common sense basics must also be checked out and not totally depend on computer fault codes.Hope this helps.bw Johnnyman.

Posted on Jul 19, 2009

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Could be a intake leak .engine could be getting too hot.make sure radiator core or grille not block .make sure coolant fan working replace radiator pressure cap. you have the right amount coolant in car.the way it look if engine get too hot it effect transmission.transmission get hot also not going to move fast.also check transmission fluid.

Posted on Jul 13, 2009

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Could be the 02 sensor, but that would cause the engine light to some on..

when is the last time you changed the air filter?

Could be dirty injectors, maybe try to run some seafoam through it, cleans the whole fuel system.

Posted on Jul 12, 2009

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