Evening all,

Thought I would do an update on this and give brief summary of history to save you trawling through previous posts. Low mileage car driven sedately by high mileage old boy. PO170 keeps popping up (Fuel Trim). Car drives perfectly and no issues with emissions. MAF changed with genuine Bosch unit. Lambda sensor (pre-cat) changed with NTK unit. Both items pico-scoped and working well. John Cooke kindly did smoke test, installed latest software and reset adaptations. PO170 popped up again on the very first drive. The clue to all this is that when I reset the EML with the engine running, the car can be heard and be seen to go lean with 02 at about 5% and both Lambda sensors stuck at about 0.2%. This will be the case for about 5mins or so and then gradually return to normal. So, on my last visit a couple of days ago I concentrated on this aspect. I went for the EGR valve thinking it may be partially stuck open allowing un-metered air into the intake although I thought this would cause crappy running. To my surprise, it did not appear to have an electrical solenoid although the EGR body and pipe leading off to the inlet manifold was there. ACT2 could not activate the operation of the EGR valve. Could anyone advise on this set-up. So, I left the EGR valve alone and did a "Heath Robinson" and blocked off the vacuum pipe on the crankcase-breather from rocker cover to intake. Cleared code down and mixture momentarily went lean and stabilised as normal. 02 at 0% and CO and HC at 0. Sold him some injection cleaner in case there is an issue with the injectors. So, now awaiting the call if it comes which will be in the next 2 -3 weeks
when the EML comes back on!

Regards

Pete M