2000 Seville SLS, 2003 Deville Base
Have had a nuisance problem with P0410 in my Deville. Replaced the original air pump with a New Delco one with the updated style intake hose. Lasted a couple months then the code came back. Warrantied the pump with Rock Auto and replaced a second time. When I removed the original and first replacement pumps, I noticed a decent amount of water in the filler tube and cover for the pump. Decided to mess with it again today and took the pump cover off again, no surprise it had water in it. This time I did something different though by starting the car with the actual pump motor and I take hole exposed. I didn't hear the vacuum sound like I used to and heard more of what sounded like an exhaust leak plus I actually saw and smelled exhaust fumes coming out of the pump. The water that dripped on my shirt had a slightly oily and exhausty smell to it. Once the car went through its warmup cycle, the pump stopped and the noise went away. Not knowing much about how this system works, I'm going to assume that something is not working properly and allowing exhaust to come back into the fresh air intake which may be bringing exhaust condensation along with it and over time filling the intake tract making it appear as though it's ingesting water. My assumption is that it possibly has a bad diverter valve or valves. Does anyone know how to diagnose the valves as possibly being bad? Figure I should fix that problem before tossing another $200 pump in the car so it doesn't fail again. I only get the one P0410 code and no others under the PCM heading on the in dash diagnostics. Thanks guys, look forward to your help.