Passing a small group of cyclists, I checked the road ahead, changed down and accelerated. At that point, an oncoming van appeared ‘from nowhere.’ Foot went from full throttle to full brake and the situation passed without incident or alarm; then the dreaded EML appeared. Later that day, I checked under the bonnet, replaced the vacuum pipe on the boost solenoid valve (assume the reverse torque had pulled it off) and pulled fuse 17.
Restart and all OK - no EML. Performance, however has since been lacking: still brisk but almost as though there’s no turbo. I think I may have split the diaphragm in the boost dump valve - which was making a whining rattle under power before the incident.
My knowledge is limited and my questions for our experts are these: can I replace the diaphragm only, rather than the complete unit? - and if it must be the whole unit, should I buy a recirculating dump valve without a diaphragm, like those widely advertised as a tuning component? I’m concerned that these may place an unwelcome load on an elderly turbo.
