407 Diesel Sluggish When Cold

Put some diesel treatment stuff in it . that helps my 405 was like that untill i
put some redex in the tank and gave it a good run .so give that a good try .




On Thu, 14 Jun 2012 00:10:55 -0700 (PDT)


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Chris wrote:

i put some redex in the tank and gave it a good run .so give that a good try .

I wonder if your engine temperature sensor has gone out of spec.
If it had failed totally, then a fault should have been identified but
if it is in range but just telling lies ie indicating the engine is warm
when it is cold , this would not happen but could explain the symptoms.
I'm not familiar with the 407 engine so can't tell you  where it is located.

hth

Bob

On Jun 25, 1:06=A0am, Bob Minchin

 good try .

I think I have found what was causing the problem (though I don't
understand why). I had booked the vehicle in (overnight so they could
reproduce the problem the next morning, when sub-zero temperatures
were forecast).
However when next I attempted to start the vehicle - nothing! All
displays were normal but no starter.
Simple - a battery which had reached the end of its useful life. And,
with a new battery, the morning sluggishness problem has disappeared.
I wondered whether the turbo was electrical (well, radiator fans made
this switch years ago! No - turbo is exhaust-driven.
My best guess is that some system is voltage-sensitive - with a dicey
battery, starting would drop the voltage. It would take a few minutes
for the alternator to bring the voltage up, at which point things
return to normal. Bob's suggestion that the temperature sensor could
be involved is a possibility.
I will ask the Service Manager.
Any ideas??