Air Pump
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Junior User
Joined: Sep 2004
Posts: 74
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Air Pump
How is an air pump tested? My 460 failed emissions testing with a high CO level. I've changed the oxygen sensor, thermostat (had a low temperature unit in), and the engine squeals upon start-up. I've dressed the belts but I'm still looking of the noise and think the air pump may be bad. It goes away after two three minutes of running.
Postmaster
Joined: Mar 2001
Posts: 4,968
Likes: 3
From: So Cal
I don't know how they are tested but the couple that I have seen failed on family cars were either frozen solid or were very tight and had screachy bearings.
I would guess your engine squeal on start up is due to bad bearings in the pump and maybe it goes away as the bearing warms up and gets a little oil spread around in the bearing.
Good Luck,
Jim Henderson
Good Luck,
Jim Henderson
I would guess your engine squeal on start up is due to bad bearings in the pump and maybe it goes away as the bearing warms up and gets a little oil spread around in the bearing.
Good Luck,
Jim Henderson
Good Luck,
Jim Henderson
