Easy Fix for the P1416 DTC ...
Thread Starter
Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
Easy Fix for the P1416 DTC ...
... and it only took 15 minutes and $1 worth of carb cleaner. Here's how. I know others have explained how to do this, but one more explanation can't hurt.
I used some carb cleaner to clean both check valves tonight to try and get rid of my P1416 trouble-code and Check Engine Light. Pulled the AIR hose open at the splice next to the windshield washer fluid tank (no clamps there), and sprayed ALOT of carb cleaner down the hose. Then used compressed air at about 25 psi to blow the cleaner through the AIR hose system to both check valves. Repeated the process a couple more times, and probably used 1/3 or more of the can of carb cleaner. Blew air through the system for awhile after the last douching of the system to evaporate the carb cleaner before firing up the engine. Reconnected the AIR hose and fired it up. Had some funky exhaust smells until everything burned off inside the exhaust system. BTW - carb cleaner was CRC brand, and it says it's safe for O2 sensors and catalytic converters.
Drove the car a few different times and checked for P1416 after each drive. NO CODES found. Seems the carb cleaner cleaning method worked for now. I didn't use any WD-40, as I'm not sure what that might do to the O2 sensors and cats. I had pulled the AIR tube off of the check valve on the drivers side before cleaning the system, and noticed a slight oil residue on the inside of the tube. I think the valves let a little blow by go backward through them, and with time they get gunked up with exhaust residue, and the heat might make the residue even worse with time. Carb cleaner is good for cutting oily residue and carbon build up. Not sure if using WD-40 might end up causing more residue in the check valves due to heat. Sticking with straight carb cleaner seemed to work fine for me.
I used some carb cleaner to clean both check valves tonight to try and get rid of my P1416 trouble-code and Check Engine Light. Pulled the AIR hose open at the splice next to the windshield washer fluid tank (no clamps there), and sprayed ALOT of carb cleaner down the hose. Then used compressed air at about 25 psi to blow the cleaner through the AIR hose system to both check valves. Repeated the process a couple more times, and probably used 1/3 or more of the can of carb cleaner. Blew air through the system for awhile after the last douching of the system to evaporate the carb cleaner before firing up the engine. Reconnected the AIR hose and fired it up. Had some funky exhaust smells until everything burned off inside the exhaust system. BTW - carb cleaner was CRC brand, and it says it's safe for O2 sensors and catalytic converters.
Drove the car a few different times and checked for P1416 after each drive. NO CODES found. Seems the carb cleaner cleaning method worked for now. I didn't use any WD-40, as I'm not sure what that might do to the O2 sensors and cats. I had pulled the AIR tube off of the check valve on the drivers side before cleaning the system, and noticed a slight oil residue on the inside of the tube. I think the valves let a little blow by go backward through them, and with time they get gunked up with exhaust residue, and the heat might make the residue even worse with time. Carb cleaner is good for cutting oily residue and carbon build up. Not sure if using WD-40 might end up causing more residue in the check valves due to heat. Sticking with straight carb cleaner seemed to work fine for me.
Resident moron
Joined: Jun 2003
Posts: 4,746
Likes: 20
From: Assachusetts
Hmm interesting. I just did the same on my car, but I used WD40 as well.
Oddly enough I think I may have discovered my issue during the process, because as I was blowing compressed air into the tube I saw some bubbles around the gasket under the driver's side AIR tube. Pulled it apart and you could see the carbon streaks on the gasket from where it had failed. Replaced the gasket and no more problems.
Dope
Oddly enough I think I may have discovered my issue during the process, because as I was blowing compressed air into the tube I saw some bubbles around the gasket under the driver's side AIR tube. Pulled it apart and you could see the carbon streaks on the gasket from where it had failed. Replaced the gasket and no more problems.
Dope
