Car is a low mileage 2005 2.5SE which is currently off the road for winter and being sorted for hopefully what might be a nice spring and summer (joke!).
Last summer I was chasing fault codes on both banks for 'oxygen enrichment' having changed both post cat oxygen sensors due to 'heating element' failure. Classic hallmarks of air getting in on the inlet side. I stripped it all down expecting to find a crack in the boot or similar but nothing ,all is sound, even the blanking plugs at the rear of the engine. At this point I should have paid for a smoke test but my local trusted garage didnt have the equipment. In desperation, I tried disconnecting the MAF to run on default settings .
Oddly with MAF disconnected engine revs would increase every time I touched the brake pedal which really puzzled me as I couldnt see any relationship between the brakes and inlet setup. I am no expert on these things but I realised that the inlet boot has a connection to something called a Sucking jet pump (no idea what this does) and another connection going up to the brake servo with what is called a Vacuum pipe with non return valve.
My question is, has anyone changed this pipe where it enters the servo. Does it just pull out or is some dismantling required. Also could this non return valve be malfunctioning such that revs increase and consequently air bleed back into the engine setting fault codes.
I cannot find any threads where this has been raised before so any help would be much appreciated.
Last summer I was chasing fault codes on both banks for 'oxygen enrichment' having changed both post cat oxygen sensors due to 'heating element' failure. Classic hallmarks of air getting in on the inlet side. I stripped it all down expecting to find a crack in the boot or similar but nothing ,all is sound, even the blanking plugs at the rear of the engine. At this point I should have paid for a smoke test but my local trusted garage didnt have the equipment. In desperation, I tried disconnecting the MAF to run on default settings .
Oddly with MAF disconnected engine revs would increase every time I touched the brake pedal which really puzzled me as I couldnt see any relationship between the brakes and inlet setup. I am no expert on these things but I realised that the inlet boot has a connection to something called a Sucking jet pump (no idea what this does) and another connection going up to the brake servo with what is called a Vacuum pipe with non return valve.
My question is, has anyone changed this pipe where it enters the servo. Does it just pull out or is some dismantling required. Also could this non return valve be malfunctioning such that revs increase and consequently air bleed back into the engine setting fault codes.
I cannot find any threads where this has been raised before so any help would be much appreciated.
