Check Engine light on
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Check Engine light on
The check engine light had come on my '09 XF Supercharged, couple of days ago. After that, i felt that the engine has not been responding to me while accelerating, even in dynamic mode. i took the car to the dealer and code showed up as P0128 and they replaced the thermostat and thermostat seal, along with with antifreeze. However after picking up the car and driving for 30 miles, that light came back on. Last night when i started the car after dinner, a thick cloud of white smoke came out and then it was fine. Same thing this morning. I am not sure if it is some sort of leak and the engine is burning more fuel??
Any experts could chime in, it would be of great help. I am taking it back to the dealer today...
Any experts could chime in, it would be of great help. I am taking it back to the dealer today...
#2
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BigCat09 (10-16-2012)
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I am not sure the fault leads to a lean condition even though it involves an air leak. The leak may push measured and supercharged air out rather than drawing unmeasured air in. The former will cause the ECU to put excessive fuel in as it measures air taken in, calculates correct fuel amount but not all the air gets to the cylinders to be mixed with fuel, you then get excessive enrichment in the cylinders from correct fuel amounts. Boosted engines can produce odd results when air leaks out. Naturally aspirated engines always leak extra air in so produce lean effects.
BTW white smoke could be coolant burning. Isn't the SC intercooler water cooled?
BTW white smoke could be coolant burning. Isn't the SC intercooler water cooled?
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BrentGardner
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