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#3237662 - 01/04/14 08:57 PM 2010 Sentra piston slap?
Stelth Online   content


Registered: 02/24/11
Posts: 1392
Loc: California
My wife drives a 2010 Sentra 2.0S. It's a nice little car, but when you start it cold, it almost sounds like a diesel. It quiets down after about 5 minutes of driving, and doesn't make that sound until the next cold start. In fact, at idle when it's warm, I almost can't hear it running.

Does that sound like piston slap? Does it mean anything?
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#3237679 - 01/04/14 09:11 PM Re: 2010 Sentra piston slap? [Re: Stelth]
mclasser Offline


Registered: 04/13/13
Posts: 378
Loc: DC
What kind of oil & filter are you running? Some oil filters can cause start up ticks/knocks.
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#3237682 - 01/04/14 09:12 PM Re: 2010 Sentra piston slap? [Re: Stelth]
Ramblejam Offline


Registered: 11/05/13
Posts: 905
Loc: Kentucky
How much oil are you using (consumption)?

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#3237692 - 01/04/14 09:22 PM Re: 2010 Sentra piston slap? [Re: Stelth]
Stelth Online   content


Registered: 02/24/11
Posts: 1392
Loc: California
Not using any oil.

Last OC was Chevron Supreme 5w-30, OCOD. Current fill is RP 5w-30 RP, RP filter.
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#3237702 - 01/04/14 09:30 PM Re: 2010 Sentra piston slap? [Re: Stelth]
Klutch9 Offline


Registered: 01/07/09
Posts: 1782
Loc: Rochester, MI, US, World
It could just be injectors. Many modern vehicles have noisy injectors that can be mistaken for piston slap or valve noise, especially when cold.
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#3237722 - 01/04/14 09:44 PM Re: 2010 Sentra piston slap? [Re: Stelth]
crazyoildude Offline


Registered: 07/23/08
Posts: 5290
Loc: new jersey
mileage?
how does your oil filter mount on that engine?


Edited by crazyoildude (01/04/14 09:45 PM)

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#3237753 - 01/04/14 10:04 PM Re: 2010 Sentra piston slap? [Re: Stelth]
andyd Offline


Registered: 09/25/04
Posts: 3737
Loc: Marshfield , MA
Yah It maybe a bad anti drain back valve in the filter. I would try a new oil filter of a different brand.


Edited by andyd (01/04/14 10:05 PM)
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#3237757 - 01/04/14 10:09 PM Re: 2010 Sentra piston slap? [Re: Stelth]
artificialist Offline


Registered: 09/23/07
Posts: 6758
Loc: Florida
You can buy an automotive stethoscope for a few dollars and probe different parts of the car with it to determine a cause. There are youtube videos that explain how to use it.
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#3237777 - 01/04/14 10:24 PM Re: 2010 Sentra piston slap? [Re: Stelth]
Jeffs2006EvoIX Offline


Registered: 02/28/10
Posts: 1287
Loc: Imperial Valley, California
I wouldn't be surprised if it was the filter too. Try an oem filter and see if it does the same thing. That noise went away in previous hyundais I had as long as I used oem filters. Weird I know.

Jeff
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#3237835 - 01/04/14 11:34 PM Re: 2010 Sentra piston slap? [Re: Stelth]
bigjl Offline


Registered: 09/06/12
Posts: 1699
Loc: London, England
Why would a different filter or different anti drain back valve cause an engine noise that lasts 5 minutes?

A few seconds delay in the hydraulic tappets/lifters is one thing but 5 minutes.

Subarus have been known to suffer piston slap but it has had no obvious ill effect in engines affected.

Injector noise is an interesting theory.

I assume when cold more fuel will be injected in much the same way as a choke on a carb.

That would certainly fit with what the op is hearing.

Perhaps some fuel injector cleaner may help.

I would be inclined not to worry too much if the car otherwise runs well.
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#3237899 - 01/05/14 02:29 AM Re: 2010 Sentra piston slap? [Re: Stelth]
shDK Offline


Registered: 04/03/13
Posts: 539
Loc: Denmark
Coult also be a leak in the exhaust manifold. A Crack or blown gasket. That close when the engine is getting warm.

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#3238061 - 01/05/14 09:29 AM Re: 2010 Sentra piston slap? [Re: shDK]
Stelth Online   content


Registered: 02/24/11
Posts: 1392
Loc: California
Here's a video of a guy with a 2011 Sentra with the same sound. Skip to about 3:00, that's when you can really start hearing it.

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#3239558 - 01/06/14 03:02 PM Re: 2010 Sentra piston slap? [Re: Stelth]
Stelth Online   content


Registered: 02/24/11
Posts: 1392
Loc: California
Anybody look at the video?
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