Question about 1994 Jaguar XJ6

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1994 xj6 4.0 hard to start,runs rough and no power ,displays fuel

12 code,also trans warning light comes on and car goes into limp mode suspect mass air flow meter,as this is an expensive part is there a way to verify that it needs to be replaced

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  • Tracy L. DeLand Feb 13, 2013

    This sounds a lot like what I am experiencing. I have replaced the coolant temp sensor, throttle positions sensor, mas air flow and the ecu. With the coolant temp sensor disconnected the engine is had to start and keep running unit it warms up[, then runs fine. What next?

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When this problem happens I would check the timing.  As your question was not fully reproduced, I would appreciate a more detailed description of your problem.  It could be the onboard computer has a fault and you are getting warning lights and the more obvious symptoms as a result.  Michael

Posted on Jan 15, 2009

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  • Possible causes
  • Faulty mass air flow sensor
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    - Dirty mass air flow sensor
    - Dirty mass air filter
    - Mass air flow sensor harness is open or shorted
    - Mass air flow sensor circuit poor electrical connection
  • Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.
  • possible symptoms Engine Light ON (or Service Engine Soon Warning Light)
    - Engine stall
    - Engine running rough
    - Excessive fuel consumption
    - Excessive smoke
  • the code is generated when An excessively high voltage from the sensor is sent to Engine Control Module (ECM).
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