My brother’s car makes a horrible noise when starting and idling, which goes away as the car is driven. The error codes involved were P2187 (Fuel system too lean at idle), P0441 (EVAP Emission System Incorrect Purge Flow), and P2177 (Fuel System to lean at off idle.
It was suggested to me that the canister purge valve would be the most likely culprit. After watching some videos like this one (https://www.youtube.com/watch?v=F85dqJ9lxWY), I took it out and tested it. I could not blow through the hose when the valve was unpowered. When powered, air passed through, and the ‘click’ seemed decently loud, more like the noise produced by working valves than the broken ones. So it seems to work?
What are the next things I should attempt to pin down and fix the problem? I haven’t really done much car stuff previously (trying to learn to save money), so I was really hoping the problem would be the most straightforward thing.
I suppose it could be a hose thing. I know there are separate error codes for leaks, but considering the age of our vehicle, I’m not sure its error codes will be as detailed as more modern cars. If there was a hose leak, I think it would likely be on the hose section nearest to the engine, since I was blowing into the other side, correct? Would duct tape help?