I have a 98 Corolla LE 4sp Auto 117K miles.
Car overall runs spectacular. But a while back I noitced rather noisey buzzing noise coming from somewhere in the engine compartment, you cant hear it when the motor is idle or if you rev it up in neutral or park. But when you push the gas pedal just hard enough in drive it you can hear it. Its like a buzzing/ticking noise, and it pulsates, especially when you really get on the gas pedal and let it go past 4000 Revs. I took it to a local Tuffy and had them go through the exhaust system, thinking it was an exhaust leak, but they said they couldn't find anything wrong with the exhaust, they guessed it was my short ram air intake I had installed a while ago. I thought that was kind of odd beacause both of my cars in the past have had these intakes, and never had an issue like this came up.
My guess is there is a leak at the intake manifold, probably at the gasket somewhere, but I was wondering if I could get some input as this is thorougly stumping me. I replaced the air filter with a K&N so thats not the issue, and I noticed that this noise gets especially louder when its wet out, if it is bone dry out on regular driving I rarely hear it, but if its nasty weather, raining/snowing sometimes I hear it no matter how lightly I press the gas pedal. There was a strange instance where I was driving on a back road and hit a huge snow drift. it was up to the bottom of my car's front bumper where right when i hit the drift this buzzing noise was extremely loud, even if I reved up the car in neutral I could hear it. but after about a quarter mile of travel, it went back to how it was
Any thoughts?
Linear Mode
