Great new Sub thread makes things so much easier..
ok, I a
have just developed what i believe is a strange issue with my Signum and wonder if there is someone who can advise me..
Car has been running beautifully, no smoke and smooth as ou like.
Since the 5 jan i have had to travel t stafordshire stone to be exact to do training for my new job, this is a 400 mile round trip.
I first noticed a problem when i tried to do am overtaking manovere, my car being an auto, i expected it to kick down and take off...needless to say it didnt..
Instead it felt like teh brakes had been applied and as the revs started to climb ( very slowly and stagered ) the car jolted given a sensation of a car being push started and disengaging the clutch but the car not starting..for those who have not expeiienced that it caused the car violently shake..
Since then i have noted that, the car when cold is ok to about 50 miles an hour with slow excelleration..
when hot the car starts to hold back a4 40 miles an hour.
The hesitation is found in rev range of 2k to 3k.
After jolting and stuttering the car will briefly cure itself and excellerate like a bat out of hell the judder again.
When the car judders white smoke ( atomised un burnt diesel ) is expelled quite alot and leaves clouds easily visable in the rear view mirror.
However again the fuel economy over the 410 miles travelled yesterday car returned 48 mpg.
I have replaced the fuel filter, done 8000 miles.
I have cleaned the MaF sensor. also have inspeced teh air filter which semed pretty clean again 8000 mile old / 6 months..
Any ideas much appreciated