Recently when under normal acceleration I now get a loud sound until I get to cruise speed or let off the gas. It can best be described as a fog horn sound or very similar to the sound you get when blowing over the lip of an empty beer bottle. It is a constant sound that does not vary in tone with RPM and does not seem to be drive line related but more engine/intake/turbo related in my opinion. It does not happen under very light acceleration, disappears as you get to cruise speed (or let off the gas), and to me does not sound mechanical (no grinding, clicking, banging, rattling sounds).
I wanted to see if anyone here has encounter this issue and see what was the solution.
I’d guess the howl is a front differential or wheel bearing issue rather than an intake howl. Since it is impossible to pinpoint a noise without being there, I’d suggest taking to a good independent auto shop for a diagnosis. Expect to pay for the mechanic’s time.
Nevada makes a good point. I’ve heard similar sounds coming from the air-intake path when something has come loose. Or (which is usually the case) I’ve forgotten to tighten a clamp or two after doing a repair. These sorts of sounds can also come from from roof racks, windows not sealing shut completely, and the like. The latter is only related to vehicle speed and wind speed and direction, not engine/trans.
I heard a similar sound on my Corolla when the clamp holding the intake resonator (sort of banana shaped on the Corolla) to the main intake path was loose. I think of those things as a place for the storage of a bulk of clean air, ready to go into the engine if a rapid throttle opening is required.
Sometimes I’ll place an obstruction over the carb air intake opening on my truck ( for testing purposes), leaving just a small opening to sustain the needed idle air flow, and will hear a sort of howling sound then too.
On my truck that is usually is a sort of chirping sound. Often can only be heard when driving next to something that reflects the sound from underneath back to the driver. Cement barrier, van, bus etc. As soon as I hear it I lube the u-joints, so don’t know what it sounds like if left un-lubed for many miles.
