I seem to have an intake leak upstream of the throttle, and I'm looking for suggestions at to how I might find it. The vehicle is a 2005 scion xb.
I first suspected that I might have a leak when I started hearing a "squealing" noise that was throttle dependent - no noise at idle, and no noise at ~10% load, but at very slight openings there is a whistle/squeal which has only recently become noticeable (but is annoying). I did a pretty quick visual inspection of the intake system and didn't find anything obvious... I decided that if there was a leak it must be a small one, so no big deal (except that damn squealing).
I've just gotten back the results of an oil analysis, and (surprise, suprise) it shows high silica and various wear-related metals. Seems like my engine is getting dusted. Now I need to find that leak.
When I'm under the hood with the engine running, the leak is not loud enough for me to get a bead on it even if I monkey around with the throttle. It doesn't help any that I've got some halfway-bad alternator bearings joining the chorus (I'll replace that when it stops charging).
I first suspected that I might have a leak when I started hearing a "squealing" noise that was throttle dependent - no noise at idle, and no noise at ~10% load, but at very slight openings there is a whistle/squeal which has only recently become noticeable (but is annoying). I did a pretty quick visual inspection of the intake system and didn't find anything obvious... I decided that if there was a leak it must be a small one, so no big deal (except that damn squealing).
I've just gotten back the results of an oil analysis, and (surprise, suprise) it shows high silica and various wear-related metals. Seems like my engine is getting dusted. Now I need to find that leak.
When I'm under the hood with the engine running, the leak is not loud enough for me to get a bead on it even if I monkey around with the throttle. It doesn't help any that I've got some halfway-bad alternator bearings joining the chorus (I'll replace that when it stops charging).