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Matt, Mechanical Engineer
Category: Jaguar
Satisfied Customers: 22758
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a 2006 Jaguar X type estate, bought it at 90.000

Customer Question

Hi I have a 2006 Jaguar X type estate, bought it at 90.000 miles, now on 160.000 keep it all serviced and have never had a problem with it. However, started to get an engine management light come on, had it plugged in and was told it was EGR valve, had this replace twice but light still coming on, now car is driving like it hasn't got a turbo, it don't smoke, it don't use oil, it's not getting hot , it simply hasn't got the power in it like it had, any one got any ideas? Also was told by someone to fit something on the engine that re programs the engine management and gives better ecconemy, but don't know anything about them? Phil
Submitted: 11 months ago.
Category: Jaguar
Expert:  Matt replied 11 months ago.


I'd 1st check the connections and wiring to the EGR valve, if either the vacuum pipe of electrical connection are damaged / corroded then the EGR can be on all time which certainly will hurt performance.

If this is OK then check the small vacuum lines to the turbo and its connected control solenoid on the bulkhead, any cracks or leaks can give turbo issues and its best to have the boost pressure measured actually measured with a boost gauge to check that the turbo is healthy and that the sensor is reading correctly

If its a variable vane turbo (they’ll be an actuator on the turbo body - but not a wastegate) then check its vacuum pipework as above and check the connections to the diaphragm / solenoid valve

Also worth checking that the glow-plug relay is switching off as they can stick on and leave the glow plugs also on - on some cars this can force it into limp home

Also worth considering adding a bottle of injector cleaner into the tank as a clogged injector nozzle will reduce power and give poor combustion - the next stage on from this is to remove all the injectors and have them ultrasonically cleaned and flow checked

Also check all the high pressure hoses post turbo/s for any split hoses or cracked metal pipes, also check the ends of the intercooler as its not unheard of to pop the end caps off under high boost.

Expert:  Matt replied 11 months ago.

regarding the tuning devices then these do generally work well

and I can recommend these firms products

Customer: replied 11 months ago.
some good answers I guess but it was the rubber split on the air intake, so none of the above
Expert:  Matt replied 11 months ago.

Well done for fixing the issue Phil

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