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Noise on Engine Start up

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Old 10-17-2012, 12:36 AM
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2005 1.8 B/B
Noise on Engine Start up

I have a 05 C230 with 110,000 miles.

From last week, whenever I start the car, the engine starts with a weird noise.

It has never happened before. Anyone knows what the problem is?

I uploaded the video of the car starting up. The noise starts at 0:04.

Thank you in advance.

Old 10-18-2012, 08:59 AM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
The clip is too short to tell. Does the noise go away once the oil pressure comes up? If so you need a new timing chain.
Old 10-18-2012, 03:49 PM
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C180 Kompressor Wagon
Check the alternator pulley freewheel bearing also known as sprag.
Old 10-18-2012, 05:00 PM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
+1^ That too.
Old 10-21-2012, 05:16 PM
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Originally Posted by Glyn M Ruck
The clip is too short to tell. Does the noise go away once the oil pressure comes up? If so you need a new timing chain.
Noise goes away once the car is on.
Old 10-21-2012, 05:17 PM
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Originally Posted by torake
Check the alternator pulley freewheel bearing also known as sprag.
How do I check it?

Thank you in advance.
Old 10-22-2012, 03:17 PM
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Originally Posted by Mercury
How do I check it?

Thank you in advance.
Basically, you try turning the pulley quickly in either direction and check that it locks (and turns the alternator rotor) in one direction but spins freely the other. Freely is open for interpretation, but it shouldn't be solid in both directions. I should add that this method requires removing the serpentine belt.

Another method, if you have a long T55 torx bit, you can remove the plastic lid from the pulley, insert the T55 into the grip in the alternator axle and try turning. IIRC counter clockwise should lock against the belt and clockwise should spin the generator rotor with the belt not moving.
Old 10-26-2012, 11:04 PM
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I think i will bring it to the dealer to see whats wrong w it. : (
Old 10-26-2012, 11:58 PM
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2005 c230 kompressor 2003 s500 94 wrangler
Originally Posted by Mercury
I think i will bring it to the dealer to see whats wrong w it. : (
if it sounds like metal chain hitting metal...then u need a timing chain

ticking noise could be a bunch of stuff (purge valve, fuel injectors, or the lifters)

but going to the dealer is like going to an oil change place...i know plenty of people that get hired at the dealerships right out of technical school

(audi) is guilty

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