XJ XJ8 / XJR ( X308 ) 1997 - 2003

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Old Nov 8, 2018 | 11:02 AM
  #21  
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Use OBD to check IAT & ECT in case they're not working and thus spoiling fuelling.

Also check the fuel trims when it does run.
 
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Old Nov 8, 2018 | 02:00 PM
  #22  
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More and more sounds like a bad temperature sensor (it is in the crossover pipe, above the water pump). But first, disconnect the MAF sensor and check to see if you might have a bad or bent pen. Then, the primary fuel pump (how old is the fuel filter?).
 
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