Originally Posted by rattleNsmoke

I have noticed the P0299 code displayed on my SGII when towing heavy for a few hours, then shutting down for fuel stops, lunch etc. The 'Wrench' symbol lights up and defuels the engine. I pull over and shut her down. Upon restart all is well. I had the turbo cleaned and unison ring replaced by Ford 20k ago and I've religiously run Ford's cetane booster at each fill-up. I can hear my VGT cycle when idling so I'm not hell bent on the veins sticking.
This problem has plagued me even after the turbo was cleaned 2 years ago. I loaded the codes into SGII for EBV and EBP and at high idle, the EPV is only 1.66v. The EBP at high idle (2500rpm) is 21.7. From the threads I have been reading, these values seem out-of-range compared to what the book values indicate and the voltage seems quite a bit low compared to what other posters have written. The other values at KOEO and low idle compared fine. This P0299 code and Wrench light only seems to happen as I mentioned after an engine shutdown for a little while. I can tow all day and not throw the wrench light unless I shut down for fuel. It's weird and I don't want to start throwing $$ at it. One more thing. The engine bay will develop a 'humming' sound occasionally, more pronounced when cold and it's either in the intake or exhaust system. I had the muffler swapped out 15k ago to a free flowing style. If the cat converter was breaking apart internally, would it make that kind of noise? If so, perhaps that's an exhaust blockage? If so, can the cat be gutted and not throw a code and still pass emissions? They do visual inspections here in CT, if they didn't I'd replace it with a 'test' pipe or a turbo back system deleting the damn thing. Any help is appreciated.
Mike

Originally Posted by rattleNsmoke

Those are great suggestions. I'll have to get a helper(daughter) to keep an eye on the values while I smack the bugger a few times. I have the stock air cleaner. I'll blast the MAF sensor too to clean it up. Where is the IAT2 sensor located on the engine? I'll pull that and clean it too. Benny, I know how frustrating these problems can be to diagnose. I'm headed out of state with the trailer this w\e, so I'll try to duplicate the P0299 fault code when towing. What ScanGauge values should I have on the screen ready-to-go?
Mike

Originally Posted by rattleNsmoke

Those are great suggestions. I'll have to get a helper(daughter) to keep an eye on the values while I smack the bugger a few times. I have the stock air cleaner. I'll blast the MAF sensor too to clean it up. Where is the IAT2 sensor located on the engine? I'll pull that and clean it too. Benny, I know how frustrating these problems can be to diagnose. I'm headed out of state with the trailer this w\e, so I'll try to duplicate the P0299 fault code when towing. What ScanGauge values should I have on the screen ready-to-go?
Mike