Quote:
Originally Posted by 80stech
I guess it's possible that the air pump might only be noisy if there is extra back pressure from the exhaust ?? Does it seem to change with that in mind ? (on coast or accel)
You should be able to hear the air pump running on a cold start and then maybe listen for when it quits before driving away so you get an idea of what it sounds like.
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Air Pump runs perfectly, no whistle noise from that at idle, when I'm coasting around 1.5 rpm it makes a slight whistle, goes away after 5 minutes of driving, I can try to grab a video of it possible to help further diagnose
Quote:
Originally Posted by andrewwynn
There is the valve that goes from sap into the exhaust. If that isn't opening full or some other issue I could see it making a whistle. Too coincidental of the cold start and 90-120 seconds to really be anything not sap related.
Usually the bearing fails and it will make a horrendous noise like the car is trying to hover.
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yeah I've had that replaced a long time ago I believe, it was a horrendous sqeaking noise on cold starts, was extremely bad in the winter too