# 1 common for high nox
Is the EGR and its function
Check vacuum line
And check its operation
Apply vacuum to EGR while car running RPM should drop engine run rough or stall
Check EGR pindle for movement
If does not move replace the EGR
If moving port is plugged
Clean it
To check port vacuum supply connect vacuum gauge to line start engine and speed up to about 3000 RPM gauge should indicate vacuum if not the source is plugged
Clean it
Good luck
SPONSORED LINKS
Wednesday, November 7th, 2007 AT 7:59 PM