Engine clatter on startup - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

firengnred · 03-08-2010, 10:52 AM

I have noticed twice now that when I let my camaro sit for awhile, a day and a half or more, when start It I hear clattering for a second or two then it goes away. Both times have been with the remote start so I wasn't able to see the oil pressure. I've found on other forums regarding other vehicles explanations from timing chain to oil drainage leaving the top end dry on startup till oil pressure comes up. What do you all think? sound normal or should I take it in? My only apprehension about taking it in in is the dealer will need me to leave it for a couple days so they can let it sit to try and duplicate. Which I'd rather not do unless necessary.

Russell James · 03-08-2010, 12:01 PM

All my cars and trucks that I have had with LS based engines have done that.

What it is - when the engine stops at some random position. A couple valves might be open. 1, 2, or maybe none. If a lifter just happens to stop right on top of the cam lobe, over a few days spring pressure will force the oil out of the lifter and collapse it. That one lifter will clatter a couple times until the top end has oil pressure.

The higher performance engines it is more noticeable because of higher lift cams and stiffer springs.

Supposedly there is new lifters being designed for sometime in the spring '10 that don't bleed down like that. But even if they do come out with a revised lifter, I won't be messing with it. Because they have done it forever, don't cause a problem, and to change the lifters requires the heads to be removed. I'd rather hear a tap tap a couple times a year.

If it goes away in a matter of a couple seconds, don't sweat it. That's all it is - the lifter that had spring pressure on it bled down over a couple days.

HeavyD · 03-08-2010, 12:09 PM

Yah, that is all it is, perfectly normal and nothing to worry about.

firengnred · 03-08-2010, 12:16 PM

Great! Thanks for the quick response.

Bonemaro · 03-08-2010, 12:56 PM

Quote:

Originally Posted by firengnred

Great! Thanks for the quick response.

i gotta say that looks like RJT not Victory Red

firengnred · 03-08-2010, 01:00 PM

VR Baby!

Bonemaro · 03-08-2010, 01:04 PM

There it is!! Very nice. You going to Camarofest?

firengnred · 03-08-2010, 01:59 PM

Have to work

03-08-2010, 10:52 AM	#1
firengnred Drives: 2010 2SS/RS, 2006 2500 Silverado Join Date: Dec 2009 Location: Torrance, Ca. Posts: 682 View My Garage	Engine clatter on startup I have noticed twice now that when I let my camaro sit for awhile, a day and a half or more, when start It I hear clattering for a second or two then it goes away. Both times have been with the remote start so I wasn't able to see the oil pressure. I've found on other forums regarding other vehicles explanations from timing chain to oil drainage leaving the top end dry on startup till oil pressure comes up. What do you all think? sound normal or should I take it in? My only apprehension about taking it in in is the dealer will need me to leave it for a couple days so they can let it sit to try and duplicate. Which I'd rather not do unless necessary. __________________ "Watch your thoughts, for they become words. Choose your words, for they become actions. Understand your actions, for they become habits. Study your habits, for they will become your character. Develop your character, for it becomes your destiny."

03-08-2010, 12:16 PM	#4
firengnred Drives: 2010 2SS/RS, 2006 2500 Silverado Join Date: Dec 2009 Location: Torrance, Ca. Posts: 682 View My Garage	Great! Thanks for the quick response. __________________ "Watch your thoughts, for they become words. Choose your words, for they become actions. Understand your actions, for they become habits. Study your habits, for they will become your character. Develop your character, for it becomes your destiny."

03-08-2010, 01:00 PM	#6
firengnred Drives: 2010 2SS/RS, 2006 2500 Silverado Join Date: Dec 2009 Location: Torrance, Ca. Posts: 682 View My Garage	VR Baby! Attached Images __________________ "Watch your thoughts, for they become words. Choose your words, for they become actions. Understand your actions, for they become habits. Study your habits, for they will become your character. Develop your character, for it becomes your destiny."

03-08-2010, 01:59 PM	#8
firengnred Drives: 2010 2SS/RS, 2006 2500 Silverado Join Date: Dec 2009 Location: Torrance, Ca. Posts: 682 View My Garage	Have to work __________________ "Watch your thoughts, for they become words. Choose your words, for they become actions. Understand your actions, for they become habits. Study your habits, for they will become your character. Develop your character, for it becomes your destiny."

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03-08-2010, 12:01 PM	#2
Russell James Drives: '15 SS 1LE, '69 Z28 drag car Join Date: Dec 2009 Location: Mich Posts: 4,482	All my cars and trucks that I have had with LS based engines have done that. What it is - when the engine stops at some random position. A couple valves might be open. 1, 2, or maybe none. If a lifter just happens to stop right on top of the cam lobe, over a few days spring pressure will force the oil out of the lifter and collapse it. That one lifter will clatter a couple times until the top end has oil pressure. The higher performance engines it is more noticeable because of higher lift cams and stiffer springs. Supposedly there is new lifters being designed for sometime in the spring '10 that don't bleed down like that. But even if they do come out with a revised lifter, I won't be messing with it. Because they have done it forever, don't cause a problem, and to change the lifters requires the heads to be removed. I'd rather hear a tap tap a couple times a year. If it goes away in a matter of a couple seconds, don't sweat it. That's all it is - the lifter that had spring pressure on it bled down over a couple days.

03-08-2010, 12:09 PM	#3
HeavyD Drives: 1SSRS RY L99 Join Date: Aug 2009 Location: Ontario Posts: 1,323	Yah, that is all it is, perfectly normal and nothing to worry about.

03-08-2010, 01:04 PM	#7
Bonemaro Drives: 2010 RJT 1SS M6 Join Date: Jul 2009 Location: Ann Arbor, Mi. Posts: 1,692 View My Garage	There it is!! Very nice. You going to Camarofest?