2003 C5 2.2HDi auto

h2ocooler · Post by **h2ocooler** » 15 Apr 2010, 17:12

Hi all
Did a trip out to France last wednesday and came back yesterday, no problems on the way there but on the way back it seemed very under powered, once I got it rolling it was ok, keeping to the speed limits (well just over

) but there was no kickdown and acceleration was quite tame.
I had no warning lights, no messages at all (apart from the usual airbag fault) When I got to Calais and boarded the ferry it was still down on power but when I got off at Dover it was all Ok.

My last trip I have a few problems but it was chucking it down with LOADS of surface water, I had the ESP/ASR not functioning and Antipollution fault come on at the same time, both cleared the next day and have not returned.
Any idea's?????
Rob

cachaciero · Post by **cachaciero** » 16 Apr 2010, 22:21

Check the vacuum system used to control the turbo / swirl valves, a good system should give you about 200mB absolute at idle, anything much above this figure means you have a leak which can / will affect operation of both Turbo and Swirl valves.

cachaciero

sijrayner · Post by **sijrayner** » 18 Apr 2010, 18:21

just wanted to chip in here, cachaciero (hello mate) helped me out with a similar problem before, and sounds like yours is heading into same problem area, the vacuum diaphragm starts to deteriorate and you start to get odd power drops. i am sure if you ask him how to 1) check system and 2) bypass diaphragm ( as i have done, car now runs lovely and no warning coming up on dash, until i can replace the actuator) he can help.
as for the other situation with the wet weather causing problems, i believe the air intake for the airbox is situated quite low down on near side, so if you drive in UK on left or even in europe but go through puddles the water can make it's way into the airbox and cause a bit of a clog in the air filter which causes the MAF to report low air flow to the ECU and cause it to reduce fuel flow in accordance with it's readings. the ESP/ASR and anti pollution fault warning are generally the first thing the ecu reports for any fault which causes the car to not run perfectly and will (as mine did) disappear as soon as the correct fault is sorted.