Quote:
Originally Posted by Spartan
... I have heard of the issue of remapping if I fit a EGR bypass, but to be honest I cannot see any way that it would cause any engine light warnings. There is only a vacuum line attached. ...
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Basically, the DDE monitors engine speed, temps etc. and when it doesn't see a change in these when it activates the EGR, it sets a fault light.
From the TIS: -
The quantity of recirculated exhaust gas influences the mass of the fresh air drawn in: The more exhaust gas is recirculated, the less fresh air is drawn in. Since the mass of fresh air drawn in is known for all operating points with the EGR switched off, the reduction in the mass of fresh air caused by exhaust gas recirculation can be used as a measure for the quantity of recirculated exhaust gas. For the purpose of exhaust gas recirculation control, a set fresh air mass is defined in a characteristic map with following variables for all operating conditions:
- Engine speed
- Injection volume
- Coolant temperature
- Atmospheric pressure
The current setting for exhaust gas recirculation matching (service functions) is an additional influencing variable.
During operation, the quantity of recirculated exhaust gas is controlled by the duty factor at the pressure converter such that the set mass of fresh air defined for the specific operating point is drawn in. Fault code 6 "exhaust gas recirculation (control deviation)" is stored if the control unit detects impermissible deviation between the set and actual fresh air mass.
Quote:
Originally Posted by Spartan
... As to the oil catch can, I have seen that the hoses and intercooler have an amount of oil in them and when the car is tilted to one side with the inter cooler hose off it drains out. All joints are saturated in oil dribble an the only assumption I can come up with is this is coming through the turbo system from the engine. ...
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Some of this oil can be bypass from the turbo bearings but yeah, the bulk of it could be from the engine breather. It may be that your engine breather isn't working correctly - easy enough to check but given the you will need to repalce the breather gaskets if pulling it off to check, have a new breather (with gaskets on hand. :-)