Engine is knocking

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Jun 4, 2007 | 02:27 AM

SunDevil C5

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Burning Brakes

Joined: Oct 2006

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From: Tempe, AZ Crown Point, IN

Engine is knocking

I noticed quite a loud knock and ticking sound after I had taken a hard drive around. I'm not quite sure yet what or where exactly it is coming from. I know it is not the "sewing machine" noise and it was not making this noise prior. I believe I have it narrowed down to either piston slap or a stuck lifter. It is only present now on cold starts and will go away at full opp. temp. and when I accellerate and the rpm reach about 2-2.5 k. I've tried some lucas oil stabilyzer and that helped a bit but didn't elliminate the noise. I also noticed when adding the stabilyzer that I was almost a full quart low in only 1-2k miles since my last oil change. Any thoughts? Should I be worried?

Jun 4, 2007 | 02:41 PM

Benpup

Race Director

Joined: Oct 2004

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From: Retired but working

Cruise-In VI Veteran

Normal on my 383 when cold. Goes away when op temp is reached.

Jun 4, 2007 | 04:00 PM

SunDevil C5

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Burning Brakes

Joined: Oct 2006

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From: Tempe, AZ Crown Point, IN

What causes it and how can I get rid of it?

Jun 6, 2007 | 08:35 PM

SunDevil C5

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Burning Brakes

Joined: Oct 2006

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From: Tempe, AZ Crown Point, IN

ttt

Jun 6, 2007 | 09:00 PM

T VETTE

Melting Slicks

Joined: Feb 2007

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From: center of Kalifornia

I was going to say piston slap but you said it was suddenly there. Maybe you didn't notice it before when cold and just now hear it.

Jun 6, 2007 | 11:19 PM

SunDevil C5

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Burning Brakes

Joined: Oct 2006

Posts: 792

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From: Tempe, AZ Crown Point, IN

The noise started when the car wasn't even cold. It was at full opp. temp and stayed that way for awhile and then now only on cold starts.

Quote:

Originally Posted by T VETTE

I was going to say piston slap but you said it was suddenly there. Maybe you didn't notice it before when cold and just now hear it.

Jun 7, 2007 | 04:47 PM

T VETTE

Melting Slicks

Joined: Feb 2007

Posts: 2,787

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From: center of Kalifornia

Sure sounds like piston slap, normal condition for these, I would just drive it. Too much work to change pistons or rebuilt for a little noise when cold. This has been discussed before and the answer is usually drive it.