Vectra CDTi 2005 150HP 89,000 miles
I've had problems for about 6 months with EGR valve. Warning light with spanner comes on and engine power cut so canít drive above about 35mph Ė I believe this is Ďlimp mode homeí? I have an AA membership including repair cover (donít laugh) and theyíve attended twice, found the fault reported as EGR on the ecu (2nd time it reported cylinder fault first then it changed to EGR fault), cleaned the valve and Iíve been able to drive away without any problems for a few weeks/months.
3rd time warning light came on I didnít bother getting an AA van but called the repair line and they said take it into garage. The garage then couldnít get payment authorisation to replace the EGR as it was more than a day or 2 since it last happened (with patrol attending) and they said I should have taken it in straight away if the cleaning was only a temporary repair. Of course I would have done this but the patrolman said only take it in when/if the fault reoccurs Ė a lesson in reading small print. They also re-set the codes each time.
Anyhow, I got good directions online and removed and cleaned the very sooty EGR thoroughly with cam spray. I also put Forte Diesel treatment (after reading loads of reviews and deciding this or Protec was the most useful) in with about 40 miles of fuel left. It went like a bomb with the forte treatment and seemed to be driving smoother than ever for about 2 weeks then the warning light + power cut came on a 3 days ago powering up a steep hill. I stopped and restarted after a few minutes and ití hasnít recurred in the last 3 days but I expect itíll be back.
If anyone could advise how to diagnose if my EGR valve is done. I couldnít move the pin by hand (is this the test?) before or after cleaning but would it have worked for a further 2 weeks without reporting a fault if it was damaged?
The online instructions for EGR removal also mentioned cleaning the boost sensor. I couldnít get at this due to the screw head position but will get the right tool and have a go if this could really help.
Could replacing the fuel filter, air filter or any other related part help and are these simple jobs?
Should I just get a replacement EGR valve? Quoted £105 new from my local shop but Iíd be willing to try the scrap yards if itís worth trying out a used one. Again, how do you asses if itís in good working order.
Iíve also switched to Tesco fuel (from Sainsbury) after reading the additives help clear the engine out Ė I certainly seem to get some blueish smoke on occasion (couple of times a week at most only on starting) when itís got tesco fuel in.
I realise this has been addressed by other questions and replies but Iím not having any luck with the search function finding other EGR threads. Thanks in advance for any advice.