12-14-09, 03:22 PM
Okay my catera showed this code P0411, secondary air incorrect flow.... checked all the vaccuum lines and found out that a valve connector is broken. I think its called the cut off valve which one end is connected to the check valve. This is the part number I found on the item 09202055, but I checked online and went to a local GMC dealer store, and they couldn't even find it. I'm going to go the Cadillac dealership and see if they know anything about this part or find a new part number. Do any off you know if there is new or alternate part number for this valve.
12-14-09, 05:24 PM
Are you talking about the valve that sits on top next to the radiator?
12-14-09, 07:51 PM
I bought one of those for $50+ new. Try this part number 90466214; ACDELCO Part # 2142108. On rockAuto it is being listed under Emission : Intake Manifold Tuning Valve.
12-14-09, 09:01 PM
thats not the one, will try to post a picture tomorrow.
12-14-09, 11:33 PM
Found the part from Caddy dealership GM # 9192121 AIR bypass valve.
12-15-09, 05:15 PM
I know it sounds like a different thing, and may be different, but that's the closest description I could find. Caddy dealer sold me on of those for around $54. It has a vacuum hose on top, right?
12-15-09, 11:03 PM
yes and its little more bigger than the other valve.
04-06-10, 10:13 PM
Also trying to hunt down the right valve. Throwing a P0411 and started looking at all the vacuum lines and tracing. The part that has a broken connection for me is top rear of engine. There are 2 vacuum lines that run into this valve (one is broken on mine) and then a large hose runs from the valve into the side of the plenum. Anyone know what this is? None of the parts that have pictures on rockauto or gmpartsdirect seems to match. The connector that is borken is a T vacuum connection.
04-06-10, 10:36 PM
Can you post a picture for the broken part?
04-06-10, 11:40 PM
I'll try to grab a picture in the morning. Digging through the manual, it's the valve that runs to what the manual says is the "brake booster vacuum fitting" (6-26 of the 1999 manual). Maybe I'm chasing the wrong issue, but this likely isn't good. Pretty sure the broken thing is a brake booster check valve. Any chance this is causing my P0411? (I'm thinking no, but I don't see another leak in that path)
04-07-10, 08:35 AM
It could possibly be the check valve. Does you car accelarate faster when air is leaking through the valve. My in-laws car was doing that, this was before the airbypass valve broke in the front by the radiator. When the check valve broke it was ran a bit faster. I would hold my finger on the broken end and it would slow the car down. What I did was, close that hole and added another connector with the lines, but this was only a temporary fix. They had to buy a new check valve and everything is fine now. I don't remember if there was any check engine light up when this happened.