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Old 05-15-2012   #1
Brad Sewell
 
Join Date: Feb 2012
Location: Wilmington, NC
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Default Sequence of sounds at startup

I'm not looking for a tongue twister, but instead a tutorial. Can you guys tell me what all these sounds mean?

Begin with a dead cold engine and turn the key:

Chick - Chick (sounds like it comes from the passenger front of the engine)

ZZZZZZZZZZZ (fuel pump, I think)

Click (under the driver side windshield wiper, starter solenoid, I think)

And what happens when I don't hear the ZZZZZZZZZZZ that I think is the fuel pump priming?
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Old 05-15-2012   #2
GOLDCYLON
 
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Default Re: Sequence of sounds at startup

Your ABS pump makes a noise before starting as well. Thats behind the drivers seat
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Old 05-15-2012   #3
VetteMed
 
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Default Re: Sequence of sounds at startup

I've noticed the ABS making noise only after beginning to roll from a stop (accompanied by ABS ACTIVE telltale lamp).

If the ZZZZZZZZZZZZ fuel pump sound is not heard, it's probably because the rail is already primed (due to recent engine running or prior key-on prime cycle). Or a dead fuel pump, fuel pump relay, etc.
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Old 05-15-2012   #4
A26B
 
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Default Re: Sequence of sounds at startup

Quote:
Originally Posted by Brad Sewell View Post
I'm not looking for a tongue twister, but instead a tutorial. Can you guys tell me what all these sounds mean?
Quote:
Begin with a dead cold engine and turn the key:



Quote:
Chick - Chick (sounds like it comes from the passenger front of the engine)




Quote:
ZZZZZZZZZZZ (fuel pump, I think)




Quote:
Click (under the driver side windshield wiper, starter solenoid, I think)





Quote:
And what happens when I don't hear the ZZZZZZZZZZZ that I think is the fuel pump priming?
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Old 05-16-2012   #5
scottfab
 
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Default Re: Sequence of sounds at startup

Sounds all normal except the part where the engine cranks at the end and starts.
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Old 05-16-2012   #6
gbrtng
 
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Default Re: Sequence of sounds at startup

Quote:
Originally Posted by VetteMed View Post
If the ZZZZZZZZZZZZ fuel pump sound is not heard, it's probably because the rail is already primed (due to recent engine running or prior key-on prime cycle).
Not true - the pumps run for one second every time you turn the ignition on.
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Old 05-16-2012   #7
VetteMed
 
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Default Re: Sequence of sounds at startup

Mine doesn't run for 1 second as you describe. Just FWIW.
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Old 05-16-2012   #8
mike100
 
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Default Re: Sequence of sounds at startup

Quote:
Originally Posted by VetteMed View Post
Mine doesn't run for 1 second as you describe. Just FWIW.
They do on my 91..maybe 2 seconds to prime from zero pressure. If you just crank and go- the engine won't fire right off the bat.
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Old 05-16-2012   #9
VetteMed
 
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Default Re: Sequence of sounds at startup

Quote:
Originally Posted by mike100 View Post
They do on my 91..maybe 2 seconds to prime from zero pressure. If you just crank and go- the engine won't fire right off the bat.
Mine does prime from zero pressure. Once primed, the pump will not run again with Key-On-Engine-Off unless I wait for pressure to drop.
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Old 05-16-2012   #10
Brad Sewell
 
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Default Re: Sequence of sounds at startup

I drove my car yesterday and the fuel pump did not run before starting the car. And the car started fine. 3 times.

I think I remember in the past the pump would run until I started the car.
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