hi have an 06 2.0 tdi 130bhp, has started popping back through air intake on start up, engine is running fine, (no missfire) and as you drive off sounds like exhaust blow and knock (not mechanical) as speed picks up noise and knock stop, popping through intake stops and car drives as normal, doesnt always do it but appears to be getting more regular, suspect it may be egr valve but have no management lights on, has anyone had similar symptons with egr faults. many thanks ron
