Question about 1998 Jaguar XJ8L

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Wont start, no faults on ecu,keeps flooding,

Parked car in garage, next day wont start, showing 17v plus on batterrie,no faults come up on dyno scan,took plugs out wet,(petrol) dried them put them back next day. tried again still will not start, turns over.when i turn ignition key theres a wurring under bonnet which is continuous. could it be a fuel pump relay not shutting off, and flooding the engine,

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  • yugo2224 Oct 13, 2008

    super flooding, was the problem, the cold start, stuck on, so i removed the plugs squirted oil down each bore,pulled out the fuel pump relay,turned it over a few times, then put the relay back replaced the plugs, cranked it over and voila thankyou thedonne most helpfull.

  • mjmmb2000 Oct 27, 2008

    02 XJ-8 4.0L, turns over, seems flodded. had same problem 1 year ago when weather turned cold. Will waiting a day help?



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Sounds like the old nikasil problem.Remove all of the spark plugs and squirt oil down each bore,replace plugs and she should fire up.

Posted on Oct 12, 2008

  • thedonne Oct 13, 2008

    Happy to help, safe motoring

  • thedonne Oct 29, 2008

    The 02 xj8 should have steel liners and not nikasil coated ones.It would be prudent to remove and clean plugs.When you start the car dont touch the accelerator while the engine is cranking, if by chance you do flood the engine leave it alone for an hour or two then push the accelerator to the floor while starting. This stops fuel being pumped into the engine and any existing fuel should fire, once this has happened again leave the gas alone until she fires up


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Both the 3.2 and 4.0 V8 engines with steel liners, post '02 suffer
cold re-start flooding and Jaguar don't have a fix and will not recognisethe problem,
try asking a main dealer!

My own '04 3.2 would never fail to start from ice cold but if it was switched off
within 30 seconds, or so, a normal restart was impossible. Over fueling was the
cause and, whilst not a solution, a way around the problem is to floor the
accelerator (cutting off all injectors) and crank until it restarts. A word of caution:
Make sure your battery is in good shape and don't over heat the starter motor for cranking for more than 15 seconds, with a 30 second break. As soon as a refire is noted, back off the accelerator and 'nurse' the engine into life.

It amazes me that a luxury car like this can have such a fault and yet no fix!

Posted on Jan 21, 2012


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