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Old 09-19-1999, 04:00 PM
Registered User
Join Date: Sep 1999
Location: Toronto, Ontario
Posts: 210
Just curious, my C36 makes this engine sound when i turn the key to the rigght just before crank. it makes this sound for about a cou0ple of seconds and goes away. wonder what that is.

Old 09-19-1999, 06:30 PM
akry's Avatar
W140 Maniac
Join Date: May 1999
Location: Burnaby, BC, Canada
Posts: 960
What kind of sound is it?? Can't you describe it more clearly??

My '92 400SE makes sound before crank, too. Sounded like electronic stuffs powered up and fuel pump...etc. prepare to operate.

I have thought it's normal, since it has that sound the first day I got my car(bought new).

Andy Kuo
'92 400SE
71,118 KM
Old 09-19-1999, 07:40 PM
Registered User
Join Date: Sep 1999
Location: Toronto, Ontario
Posts: 210
Yup, it sounds like a pump or something electrical. Still dunno what the sound is though. I figure its a pump of some sorts to squirt oil onto the top of the engine???
I usually turn the key, hear the noise and start the car when the noise stops.
Old 09-19-1999, 08:52 PM
Chris Ecklund
Posts: n/a
My guess is that it is the electric fuel pump pressurizing the system. When the system is pressurized it shuts off, which would be only 1-2 seconds as the engine is not using any gas. Once the car starts to crank, the pump would switch on again.

Just my guess

Chris Ecklund
98 300 DT
Old 09-19-1999, 10:00 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Yes it is the electric fuel pump(s) pressurizing the system.

1987 16V

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