Paul T
Member
Hi all, after some time reading these threads, I've decided to join and post one of my own!
My 2009 D40 2.5 started making a arrhythmic knocking sound from the passenger footwell, most noticeable at idle. Checked under the bonnet and narrowed it down to a buzzing boost control solenoid. Whilst waiting for a new one, I thought rather than depositing half my fuel tank in unburnt diesel into the atmosphere, I bypassed the solenoid and connected the main vacuum line directly onto the actuator. Not surprisingly, I had boost again! All was well, and I drove gingerly to try and prevent the turbo overboosting. However, on a hour long journey along the highway at about 90kph, going up a medium incline, I suddenly lost boost. Over the rest of the journey, this got worse and worse, until every time I exceeded 2000rpm under even extremely gentle throttle, the boost would disappear.
Once the new solenoid arrived, I fitted it and it seemed to work ok for 5 minutes (at least at low rpm) but the same problem reared its head under load above 2000-3000rpm (I rarely go over this anyway). Most of the time, I get boost at the bottom end, but it dies just before the point I change gear.
What have I done in bypassing the solenoid? Any ideas? I think is more than a potentially faulty new solenoid...
Thanks for your help
My 2009 D40 2.5 started making a arrhythmic knocking sound from the passenger footwell, most noticeable at idle. Checked under the bonnet and narrowed it down to a buzzing boost control solenoid. Whilst waiting for a new one, I thought rather than depositing half my fuel tank in unburnt diesel into the atmosphere, I bypassed the solenoid and connected the main vacuum line directly onto the actuator. Not surprisingly, I had boost again! All was well, and I drove gingerly to try and prevent the turbo overboosting. However, on a hour long journey along the highway at about 90kph, going up a medium incline, I suddenly lost boost. Over the rest of the journey, this got worse and worse, until every time I exceeded 2000rpm under even extremely gentle throttle, the boost would disappear.
Once the new solenoid arrived, I fitted it and it seemed to work ok for 5 minutes (at least at low rpm) but the same problem reared its head under load above 2000-3000rpm (I rarely go over this anyway). Most of the time, I get boost at the bottom end, but it dies just before the point I change gear.
What have I done in bypassing the solenoid? Any ideas? I think is more than a potentially faulty new solenoid...
Thanks for your help