EGR reset?

Cyberoid

Member
I have got the EGR insufficient flow fault code on my TDI 75. It is an 2005 BHC engine.

Got the EGR valve replaced but the MIL keeps coming back with the same warning.

Do you need to code or calibrate the new valve? There is no sensor on the valve itself so I am not sure how it measures the EGR flow?
 

kp 115

Member
I have got the EGR insufficient flow fault code on my TDI 75. It is an 2005 BHC engine.

Got the EGR valve replaced but the MIL keeps coming back with the same warning.

Do you need to code or calibrate the new valve? There is no sensor on the valve itself so I am not sure how it measures the EGR flow?
Hi ,
Is it possible a blanking plate has been fitted? If so some engines require it to be mapped out on the ecu as I believe it’s looking at temperature, but not on the AMF engines.
Hth
Keith
 

2work

Admin Team
I have got the EGR insufficient flow fault code on my TDI 75. It is an 2005 BHC engine.

Got the EGR valve replaced but the MIL keeps coming back with the same warning.

Do you need to code or calibrate the new valve? There is no sensor on the valve itself so I am not sure how it measures the EGR flow?
Morning,

As far as I know there is no coding or calibration required when the EGR is replaced. As Keith states above, it’s worth checking for a blanking plate or anything else that may not be correctly refitted. Follow the pipes and see if any of them have split/perished.

If you do wish to do away with the EGR Valve I can speak from experience that a @depronman machined EGR is great. I have an AMF engined A2 so no need for a tweaked ECU ( I had it tweaked anyway) but as you have a BHC A2 you will need your ECU tweaked to stop the MIL appearing for EGR issues.

This can all be done over the Royal Mail service with Paul so makes it quite a simple service to use.

Hope this helps you out.

Kind regards,

Tom
 

depronman

Member
I have got the EGR insufficient flow fault code on my TDI 75. It is an 2005 BHC engine.

Got the EGR valve replaced but the MIL keeps coming back with the same warning.

Do you need to code or calibrate the new valve? There is no sensor on the valve itself so I am not sure how it measures the EGR flow?

The ecu uses the pressure sensor on the intercooler and the maf sensor to establish if there is sufficient flow through the EGR valve. The egr is operated by vacuum with no position sensor fitted to it so by modern standards it it is quite crude
On the bhc and atl engines egr flow is enhanced by the partial closure of the ASV
So now the ASV (anti shudder valve) as two purposes.
One is to close the air supply to the engine when you turn off the ignition key
Two is to promote gas flow through the egr on light throttle and overrun

If the ASV as failed or is failing then this will produce the egr fault that you describe but I would have expected a fault code also for the ASV
Does the engine stop cleanly when you turn off the ignition key? If so this is an indication only that the ASV is ok

Paul


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Cyberoid

Member
Thanks all, I bought a second (brand new) EGR valve and changed it (again). Doesnt make sence but this time it worked properly. So there must have been a damaged valve I had recieved.
 

depronman

Member
Thanks all, I bought a second (brand new) EGR valve and changed it (again). Doesnt make sence but this time it worked properly. So there must have been a damaged valve I had recieved.

There is a rubber diaphragm in the egr which opens the valve when a vacuum is applied again spring pressure which is used to close the egr
Worth using a piece of pipe on the not working egr and sucking on the pipe. The valve should open and if you put the end of your tongue over the pipe whilst the valve is open it should remain open. If it doesn’t open or slowly closes with the pipe blocked off then the diaphragm is faulty. If this was a mew egr you should be able to return for a refund
I’ve machined lots of tdi egr out to remove the egr valve function and improve airflow into the engine and not one as had a failed diaphragm

Cheers. Paul


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Cyberoid

Member
Didn’t spend any time fault tracing the part as I was too exited it finally worked with the new one! But you are probably right.
 
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