Citroen C6 - Citroen C6 Diesel engine fuel supply

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Tue 11 Nov 2014 11:43
Citroen C6 - Citroen C6 Diesel engine fuel supply - Gimme

Have a C6 with 78000 miles 2.2 Diesel engine For past year have had intermittant fuel system fault . the car cruising at any speed, any road will suddenly misfire either just once or twice some times more then may nor recurr for days/weeks. Recently heading for A3 on M25 east mis fire started just after joining M25 at J13. moved out to middle lane 65 mph misfire started and repeated and engine stopped as approaching J 12 ,slipped clutch to get to n/s lane ( no hard shoulder) decided to abort and go home via M3S . released clutch and engine bump started. Continued to run. Hard shoulder cone off to J3s However got home no further misfires. At no time were any warning lights activated. Citroen Specialist cant find fault . Checking memory showed two sensors activated ( expected since one was crankshaft and other air intake which would be result of my coasting off M25 )

Any suggestions??

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Tue 11 Nov 2014 13:47
Citroen C6 - Citroen C6 Diesel engine fuel supply - Gibbo_Wirral

Has it definetly had a LEXIA diagnostic? Third party generic readers can sometimes be very poor at diagnosing.

I had a very similar problem to you, always on the motorway, when warm, car would do a shudder like fuel starvation. I keep the car regularly serviced and the fuel filter had only been done a few thousand miles before.

It turned out to be the diesel heater sensor. I wasn't getting an engine management light on the dash. A generic code reader didn't pick up a fault. But the Lexia equipment did. Reading the live data, it showed that the percieved temeperature was way off reference.

New heater sensor unit and it was perfect and has been ever since.

Have a look on this map and see if there's a fellow Peugeot / Citroen driver near you with the Lexia equipment.

www.google.com/maps/d/viewer?mid=zmVqC3NauYzA.kwOs...e

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Tue 11 Nov 2014 23:17
Citroen C6 - Citroen C6 Diesel engine fuel supply - Peter.N.

This may sound obvious but check your oil level, I had a problem with a C5 2.2 stopping for no obvious reason. It has an oil pressure sensor that shuts the engine down if it gets low, usually does it when going down hill or braking, the oil doesn't have to be very low for this to happen.

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