code 1416 check valve sticking
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From: Anthony TX
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I started the WD-40 referb procedure. Not knowing how GM designed the guts of that Check Valve, I figured that there was a disk valve with a seat that was just dirty and needed to be cleaned and lubricated.
SO,,,,,,,,,,,, Needing to know what was really happening, I dissected one. NOTHING like I pictured in my technical brain! :-(
GM used a thick rubber disk to control A.I.R. Pump air flow. When the pump runs, it BENDS the rubber disk to allow the air to flow around it. The PCM needs to see a very specific change in O2 sensor readings when the pump is running. If it doesn't, the code is set.
The problem comes after the rubber disk is exposed to heat, carbon, AGE, and wear and tear. The rubber disk either doesn't bend enough to allow enough air around it to satisfy the test OR just no longer seals.
So, if the WD-40 treatment works, its only a temp Band-Aid.
If GM used a quality poppet style valve with a quality fiber disk and teflon seal, cleaning the valve would easily resolve the issues.
Bill
SO,,,,,,,,,,,, Needing to know what was really happening, I dissected one. NOTHING like I pictured in my technical brain! :-(
GM used a thick rubber disk to control A.I.R. Pump air flow. When the pump runs, it BENDS the rubber disk to allow the air to flow around it. The PCM needs to see a very specific change in O2 sensor readings when the pump is running. If it doesn't, the code is set.
The problem comes after the rubber disk is exposed to heat, carbon, AGE, and wear and tear. The rubber disk either doesn't bend enough to allow enough air around it to satisfy the test OR just no longer seals.
So, if the WD-40 treatment works, its only a temp Band-Aid.
If GM used a quality poppet style valve with a quality fiber disk and teflon seal, cleaning the valve would easily resolve the issues.
Bill
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Joined: Sep 2013
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From: Cape Coral, Florida
I started the WD-40 referb procedure. Not knowing how GM designed the guts of that Check Valve, I figured that there was a disk valve with a seat that was just dirty and needed to be cleaned and lubricated.
SO,,,,,,,,,,,, Needing to know what was really happening, I dissected one. NOTHING like I pictured in my technical brain! :-(
GM used a thick rubber disk to control A.I.R. Pump air flow. When the pump runs, it BENDS the rubber disk to allow the air to flow around it. The PCM needs to see a very specific change in O2 sensor readings when the pump is running. If it doesn't, the code is set.
The problem comes after the rubber disk is exposed to heat, carbon, AGE, and wear and tear. The rubber disk either doesn't bend enough to allow enough air around it to satisfy the test OR just no longer seals.
So, if the WD-40 treatment works, its only a temp Band-Aid.
If GM used a quality poppet style valve with a quality fiber disk and teflon seal, cleaning the valve would easily resolve the issues.
Bill
SO,,,,,,,,,,,, Needing to know what was really happening, I dissected one. NOTHING like I pictured in my technical brain! :-(
GM used a thick rubber disk to control A.I.R. Pump air flow. When the pump runs, it BENDS the rubber disk to allow the air to flow around it. The PCM needs to see a very specific change in O2 sensor readings when the pump is running. If it doesn't, the code is set.
The problem comes after the rubber disk is exposed to heat, carbon, AGE, and wear and tear. The rubber disk either doesn't bend enough to allow enough air around it to satisfy the test OR just no longer seals.
So, if the WD-40 treatment works, its only a temp Band-Aid.
If GM used a quality poppet style valve with a quality fiber disk and teflon seal, cleaning the valve would easily resolve the issues.
Bill
