Just noticed some driver-side noise under the hood (like big Fluorescent tubes) once I pushed the key to my car before starting. It starts once I push the key in (not even started the electric system or start the car). It disappears about 30 seconds after the car is turned off. I've uploaded a youtube video on the location of the noise: http://www.youtube.com/watch?v=CkhO8ULZD4M Any thoughts will be appreciated.
Cannot figure out what that part is, but it has a vacuum line connected. Therefore, it should not be functioning unless the engine is running. I would have to guess there is a wire crossed in the key cylinder. The presence of the key should activate the warning system and perhaps deactivate the security system. However, the engine system wiring comes in proximity to the warning wiring behind the ignition switch near the contact reel. It's possible you have a short in that area. I am posting access instructions from autozone.com.
CAUTION
Models equipped with a Supplemental Restraint System (SRS), use an inflatable air bag. Whenever working near any of the SRS components, such as the impact sensors, the air bag module, steering column, and instrument panel, disable the SRS.
To install:
Screws from lower coverClip mounting between the upper and lower coversLower steering column coverUpper steering column cover
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SOURCE: VOLVO S40 DOESNT START OCCASIONALLY
sounds like you need a new battery, it probably isnt running enought cranking amps to start your car, try a different battery and it should start fine
SOURCE: my car is buzzing or humming after i turn the car off
Do you have headlight wipers? If so, wiggle the wiper arm and see if the buzzing stops.
SOURCE: whining noise under the hood only when I let up on
Pull the dipstick while it is making the noise, if it goes away it is pcv box, or nipple fitting under the intake
SOURCE: 2006 volvo s40 50,000 mi.
The oil filter housing also houses the pcv system. What causes the noise is that there is a check valve in the pcv system that is supposed to regulate the pressure in the crankcase. The valve gets stuck and causes vacuum to build in the crankcase, which in turn sucks air wherever it can causing the noise, which is also why when you pull the dipstick it stops. This can also cause a check engine light with codes for fuel trim. The oil filter housing will need to be replaced. Good news is that Volvo extended the warranty on these to 100K miles so it should be free of charge at the dealer. One thing to watch for is oil leaks after the replacement from the camshaft seals. If air can get past a seal, usually oil can too. If the seals leak too long it can contaminate the timing belt and cause it to break, which causes a lot of damage.
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Thanks guys! Just tried a few tricks:1. it didn't go away after pulling the distick; 2. my headlight doesn't have wipe:( 3. the battery was good enough to start the car. Here is the part that I located the buzz:https://plus.google.com/u/0/photos/10849...
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