Infoneeded: Starting car, makes a wierd sound(knocking): please help

OrangeMustangGt

Founding Member

Mar 7, 2002

1,976

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36

Cape Cod, MA

May 31, 2004

#1

• May 31, 2004

• #1

my car has been sitting for around a day, and when i went to start it up, for the first second it made a knocking sound that imediatly went away. What could this be? My only clue is, my old f150 with 200,000 miles make sorta the same sound for like 8 secs when it first starts up, untill it gets oil pressure. COuld there be something failing with my oil pump, or what can i do about this, would anyone know where the sound could be coming from? it only does this when its been sitting for a while, same as my pickup. Thanks

 

StangJonGT

Founding Member

Jun 2, 2001

1,329

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36

Seattle

Jun 1, 2004

#2

• Jun 1, 2004

• #2

Could be some piston slap, but it is likely valvetrain noise. Change your oil to a good synthetic and monitor the level daily.


Jon

 

Afastgts95

New Member

Mar 11, 2004

50

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0

Jun 1, 2004

#3

• Jun 1, 2004

• #3

Are you a quart low on oil?

 

OrangeMustangGt

Founding Member

Mar 7, 2002

1,976

0

36

Cape Cod, MA

Jun 1, 2004

#4

• Jun 1, 2004

• #4

hmm, i will go and change to synthetic oil, i may be low also, damn rear main seal, thanks guys

 

KingDiamond

New Member

Mar 9, 2003

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0

Chicago, IL

Jun 1, 2004

#5

• Jun 1, 2004

• #5

Check your harmonic balancer too.

 

F

fearless302

New Member

Aug 25, 2003

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0

texas

Jun 1, 2004

#6

• Jun 1, 2004

• #6

mine does the same thing.......maybe someone will shed some light on this topic...

 

StangJonGT

Founding Member

Jun 2, 2001

1,329

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36

Seattle

Jun 1, 2004

#7

• Jun 1, 2004

• #7

KingDiamond said:

Check your harmonic balancer too.

Click to expand...

Usually that will affect vibration and idle, not emit a sound. This sounds very much like an oil starvation problem.



Jon

 

The Hitman

Founding Member

Oct 17, 2001

2,541

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0

Orlando, FL

Jun 1, 2004

#8

• Jun 1, 2004

• #8

Change the oil and filter and monitor the level. What kind of Oil Filter are you using? Most of them have a valve that prevents ALL the oil from draining back into the pan and leaves some in the filter so that a "dry start" does not occur. These valves can go bad leading to a dry start every time you start the car. Change the filter and monitor.
It's very unlikely that it's the pump. Not that they don't go bad.. But RARELY.
Start small and work your way up.