Stange engine noise
I have an 02 Spectra with roughly 140,000 on it. When I bought it at 128,000changed the timing belt and plugs just to be sure on the upkeep. Last week the engine started making a strange noise. The best I can describe it is it sounds like an exhaust leak but it is coming from the intake side. The engine runs fine with no hesitation or anything like that. I do catch a small whiff of gas when I start it up in the morning. The trouble codes that came up are 0325 and 0340. I changed the knock sensor, haven't changed the camshaft sensor yet. Any ideas would be appreciated.