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Not an original idea I know and with information from others on the board I decided to try it. 2017 Colorado, no tune, stock except for an oil separator.
I disconnected the line from the oil separator going to EGT cooler/intake hose. I used an AN 10 cap and screwed it into the line going to the intake to plug it off. I just left the outbound side of the oil separator to vent to atmosphere under the hood (for now). I believe I remember someone saying that if you left the hose going to the cooler/intake open to atmosphere the truck will set a code, so I capped it off. I’m not sure why this would be other than you are allowing unfiltered air into the turbo inlet, don’t know why it would set a code. Not conclusive but I took the truck on a 30 minute drive both around town and for about 10 minutes of highway at 75. No codes were set. Not sure if I’ll eventually set a code or not. I will need to route a hose from the oil separator down to the frame as I don’t want soot being sprayed all over the engine bay. I did like the fact that when I lifted the hood that it slightly smelled like a diesel, very faint.
Pro’s:
No soot or oil getting to intake.
Cleaner oil
Probably a little better response since there is no exhaust going into the combustion chamber.
Possibly a little better power? I don’t know if under heavy load the ECU shuts the EGR. If it does then it’ll have no effect at WOT.
Maybe better fuel economy? Questionable at best.
Con’s:
Might set a code, time will tell. Limp mode?
Slight diesel smell (I liked it personally)
Could cause more frequent regens? I’d have to think this one thru more as I don’t know why burning soot in the combustion chamber vs. venting it to atmosphere would cause more regens.
I disconnected the line from the oil separator going to EGT cooler/intake hose. I used an AN 10 cap and screwed it into the line going to the intake to plug it off. I just left the outbound side of the oil separator to vent to atmosphere under the hood (for now). I believe I remember someone saying that if you left the hose going to the cooler/intake open to atmosphere the truck will set a code, so I capped it off. I’m not sure why this would be other than you are allowing unfiltered air into the turbo inlet, don’t know why it would set a code. Not conclusive but I took the truck on a 30 minute drive both around town and for about 10 minutes of highway at 75. No codes were set. Not sure if I’ll eventually set a code or not. I will need to route a hose from the oil separator down to the frame as I don’t want soot being sprayed all over the engine bay. I did like the fact that when I lifted the hood that it slightly smelled like a diesel, very faint.
Pro’s:
No soot or oil getting to intake.
Cleaner oil
Probably a little better response since there is no exhaust going into the combustion chamber.
Possibly a little better power? I don’t know if under heavy load the ECU shuts the EGR. If it does then it’ll have no effect at WOT.
Maybe better fuel economy? Questionable at best.
Con’s:
Might set a code, time will tell. Limp mode?
Slight diesel smell (I liked it personally)
Could cause more frequent regens? I’d have to think this one thru more as I don’t know why burning soot in the combustion chamber vs. venting it to atmosphere would cause more regens.