So I do an EGR valve in a 6.0 the other day, P0404. Guy told me he got into a run of shitty fuel, so fine, that's likely the cause, there's a lot of soft carbon. Told him to try it out and let me know, put the little EGR baffle kit in, good to go, right?
WRONG.
Road test the truck. Do the EGR test. Fails.
Strange.
Do it again. Fails.
Pull valve out, and can visibly see the NEW valve moving open and shut during the test. Still fails.
Fuck it.
Call the hotline. (THIS IS NOT A SHOT AT THE HOTLINE, IT IS VALUABLE ADVICE - HOWEVER IT IS INFO THAT SHOULD BE OUT THERE.)
Here is the response:
Tech's question:
EGR valve failed position test on original diag. Replaced valve flashed modules to latest levels and installed baffle. Road tested truck and re-tested. New EGR valve fails EGRVP test. Please advise. It is slow to ramp up. Seeking diagnostic direction.
Hotline response:
Aaron,
The EGR valve has been changed so the operating ranges are a little different than the old valve. This can cause the EGR test to fail. If the vehicle has no drivability concerns, recommend to release the vehicle and monitor oasis for updates.
WHY IS THIS NOT A FUCKING SSM OR TSB OR BROADCAST MESSAGE!