I have a 1998 xj8 jaguar that has been taken out of storage after 5 years 35,000 miles runs great but will not go into

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Customer: I have a 1998 xj8 jaguar that has been taken out of storage after 5 years 35,000 miles runs great but will not go into kickdown mode, or can not put gas to the floor drives like in failsafe mode no codes
JA: Has the vehicle turned into a gas hog? And how does it start -- same as usual?
Customer: no it will not let you drive it hard just barley push the gas, starts perfect like new
JA: Are you fixing your XJ8 yourself? What have you tried so far?
Customer: octan and fuel additive and master reset
JA: Anything else you want the mechanic to know before I connect you?
Customer: as long as the mechanic knows the vehicle
Answered by Richard in 10 mins 4 years ago
15+ years of experience

19,890 satisfied customers

Specialities include: Automotive Mechanic, Small Engine Repairs, Auto Body Repairs, Diesel Engine Repairs

Are any warning lights or messages on? Did you try adding some fresh fuel and an additive to the tank?
no warning lights
Unfortunately I am unavailable for a phone call request at the moment but we can continue here til then.Did you try adding some fresh fuel and an additive to the fuel tank. It could be fuel related since it was sitting for a few years. Let me know.
i put additive in and fresh high octane fuel
I have put 100 miles and it runs great free revs in drive just will not kickdown to passing gear, ran electronic shift and sometimes failsafe would pop up, seams like it is in failsafe mode
Ok next time the failsafe warning pops up do not turn the vehicle off. With your scan tool try and read fault codes. Sounds like we may have a problem with the electronic throttle system. Also look inside the air intake tube and the mass air flow sensor to make sure they are clean. Let me know.
if i drive it normal the failsafe will not po up where is the air intake tube and mass airflow sensor
It is where the air cleaner is on the passenger side. Remove the tube off the air cleaner and check the air filter box. The mass air flow is the electrical sensor in line.
i tried and cleaned what you said get about another 500 rpm but no kickdown little better
Disconnect the negative battery terminal cable for about ten minutes. This will reset the throttle adaptions. Reconnect it and drive the vehicle in sport mode to see if the problem is still present.
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19,890 satisfied customers
15+ years of experience
15+ years of experience

19,890 satisfied customers



Licensed mechanics

31,131 satisfied customers

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