XJ XJ8 / XJR ( X308 ) 1997 - 2003

Hesitation under hard/moderate acceleration...

 
  #2  
Old 04-05-2007, 10:45 PM
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Default RE: Hesitation under hard/moderate acceleration...

Maybe it's mifiring...

Check around the valve covers for oil. If they area leaking, the spark plug wells will have oil also causing a misfire.
 
  #5  
Old 06-27-2007, 10:59 PM
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Default RE: Hesitation under hard/moderate acceleration...

I'd have a Jagtech check the fuel psi at different accelleration intervals. It may be being starved at hard accelleration and need a fuel system service (to include a new fuel filter). Also, wouldnt hurt to have a throttle body service, too. I had a very similar issue with mine and it was discovered that my fuel psi was below spec (ie engine was starved for fuel) under hard accelleration. The fuel service and throttle body service cured its issues.
 
 
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