Is this a DPF issue ?

[JP69]

Hi

I've owned my 2007 159 2.4 diesel for over 3 months now and all has been well apart from an issue that has just started.

On the motorway last week, the car started to shudder and instant mpg dropped to early 20's, the car wouldn't accelerate well at all. This went on for about 10 miles or so then settled down. I put it down to the DPF doing a regen (First time I've noticed it happen since I've had the car, 4,000 miles, mixture of local and motorway journeys).

Since then, the car has been fine apart from when light pressure is applied to the throttle pedal when the car seems a bit juddery, its as if it is missing. My drive into work involves a stretch of 40 mph dual carriageway and sat in 4th at 45-50 with hardly any pressure on the throttle you can feel the judder, its not a major judder (not like being in too low a gear) but noticeable all the same. Had a similar problem in a Mercedes a few years ago and that was a throttle linkage issue.

Any ideas at all ? The car is in next week for cam belt/water pump so if it is the DPF I can get them to look at it & also look at getting the DPF removed!

[Paul Vee]

I have been thinking of changing my 1.4 tb 120 bhp to the 1.6 diesel. I'm currently getting around 43mpg on a full tank, (thats calculated not from the trip). but I had a diesel out as a courtesy car when I was getting some warranty issues sorted, and was making a saving of 25 quid per week. thats a lot on my 100 mile round trip per day

[Redmatt75]

Never heard of throttle linkage issues before, but it could be the EGR valve solenoid on the way out, and flapping around. This would 'interact' with the DPF regen in the manner as described.

[JP69]

Originally Posted by Redmatt75

Never heard of throttle linkage issues before, but it could be the EGR valve solenoid on the way out, and flapping around. This would 'interact' with the DPF regen in the manner as described.

Thanks for this, will ask garage next week when car goes in.

[Scunner]

Might be the fuel you use. My 159 used to judder at 50 mph on a speed controlled section of the A77, changed fuel from Shell to BP Ultimate and no more juddering...