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Ticking noise from engine bay on start up

wazzup

Member
Joined
Oct 19, 2015
Messages
6
Location
SPAIN
Corvette
2003 C5 SPIRAL GREY ANNIVERSARY COUPE
I need some advice,my new purchase C5 2003 29,000 miles on start up cold or hot has developed a ticking noise within the engine bay.If a rev the engine in idle to 3,500 rpm the noise disapears.When I listen after a run the sound is still not present,but if I leave the car for an hour the sound has returned,I then rev the engine in neutral again and the sound disapears.The oil pressure,charging rates,coolant temperatures and pefrformance are all good.The car was garaged and not used for about a year before I bought it.I have change the engine oil and filter,Red Line 5-30 previously the engine was filled with 10-30.I have changed air filter and all levels are good.When the engine oil was changed it was overfilled by a quart though that has now been rectified.
The question is why does the sound disapear when I rev the engine,and what could the possible causes be,I live in Spain europe,and no garage over here has any idea about Corvettes,they dont have Tech 11 or workshop manuals as GM has pulled out of Spain.
 

Toms007

Moderator
Joined
Sep 24, 2004
Messages
6,489
Location
Southwest Kansas
Corvette
2007 Atomic Orange Coupe
Seems that I recall that the LS series engine is known for engine "ticks" on start up. Even my 5.3 in my Silverado has developed the "tick" as well as my previous 5.3 in my previous Silverado. Never was a problem to the day I traded it off for this one and it had over 100k on the clock.

But maybe one of our experts will check in here and confirm (or reject) my diagnosis.
 

dadaroo

Gone but not forgotten
Joined
Nov 27, 2013
Messages
530
Location
Columbia, SC
Corvette
2001 Convertibla, Navy Blue and Light Oak
Probably just normal valve train noise which the engine is known for. If you are concerned you can pull the valve covers and inspect for any obvious concerns.


Mr. Sam
 

Toms007

Moderator
Joined
Sep 24, 2004
Messages
6,489
Location
Southwest Kansas
Corvette
2007 Atomic Orange Coupe
Thanks you Mr. Sam for verifying my post. :thumb
 

wazzup

Member
Joined
Oct 19, 2015
Messages
6
Location
SPAIN
Corvette
2003 C5 SPIRAL GREY ANNIVERSARY COUPE
Thanks

Hi Guys,thank you for your feedback much appreciated :)
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
Jan 10, 2001
Messages
13,453
Location
CenCoast CA
Corvette
71 04 12 19
Gen 3/4 V8s can sometimes suffer from "cold piston knock" which is actually a clicking-ticking sort of noise. if it occurs, it will occur on a cold or even a warm start and will last a while then go away, however, that's usually regardless of rpm...that is, if the engine is cold, rev'ing the engine may not make it go away but engine warm up will make it go away.

The other noise if lifter or rocker arm noise which, again, is a ticking-clicking sort of sound. If it's a case of a lifter which is making noise, the way you discribe it, sort of fits. Rocker noise usually is always there.

Questions:
Has the engine made the noise since you bought the car or did it develop after you bought it?

Did the noise begin after you went from a 5W30 to a 10W30?

Why did you go to the 5W30?
 

wazzup

Member
Joined
Oct 19, 2015
Messages
6
Location
SPAIN
Corvette
2003 C5 SPIRAL GREY ANNIVERSARY COUPE
Gen 3/4 V8s can sometimes suffer from "cold piston knock" which is actually a clicking-ticking sort of noise. if it occurs, it will occur on a cold or even a warm start and will last a while then go away, however, that's usually regardless of rpm...that is, if the engine is cold, rev'ing the engine may not make it go away but engine warm up will make it go away.

The other noise if lifter or rocker arm noise which, again, is a ticking-clicking sort of sound. If it's a case of a lifter which is making noise, the way you discribe it, sort of fits. Rocker noise usually is always there.

Questions:
Has the engine made the noise since you bought the car or did it develop after you bought it?

Did the noise begin after you went from a 5W30 to a 10W30?

Why did you go to the 5W30?


Hi yes it appears the ticking started after the Oil change to 5-30 I went with 5-30 because I believed from the handbook and forums that was the correct oil choice,i can change to 10-30 if you feel that is a better choice,I dont want to cause a engine problem running the wrong oil.
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
Jan 10, 2001
Messages
13,453
Location
CenCoast CA
Corvette
71 04 12 19
If the tick started after you want to Red Line's 5W30, I'd go back to a 10W30.
 

gmjunkie

Well-known member
Joined
Nov 11, 2004
Messages
4,547
Location
Old Fort NC/Vero Beach FL
Corvette
03 Z-51,78 L82 Coupe
My pistons are trading holes on cold start up,Yep,I'm sure that's what I'm hearing...... :D

Quiets down before the temp gauge moves though.:thumb
 

vettenuts

Well-known member
Joined
Nov 13, 2000
Messages
123
Location
Wakefield, RI
Corvette
2002 Mag Red Convertible
I had a problem once before that was caused by carbon build-up rocking the cold piston. Not sure if you have Seafoam or an equivalent where you are located but that might be the cause as well. I would start with simple things first (oil change back to what was used when you didn't have the problem) and then work from there.
 

Paul Douglas

Active member
Joined
May 5, 2005
Messages
27
Location
Tyler, TX
Corvette
2002 Quicksilver Coupe
Ticking LS1

My 2002 has ticked like that on cold start-up since new. Goes away when warm. I have 117,000 miles now and it's as good as when new. Don't worry about it.
 

JMEM

New member
Joined
Dec 19, 2015
Messages
2
Location
Vaughan, Ontario, Canada
Corvette
2003 Aniversary Coupe
2003 Ticking noise hot or cold on start up.

Have you resolved this issue? I have a 2003 recently purchased it and it may have started after the oil change.
I need some advice,my new purchase C5 2003 29,000 miles on start up cold or hot has developed a ticking noise within the engine bay.If a rev the engine in idle to 3,500 rpm the noise disapears.When I listen after a run the sound is still not present,but if I leave the car for an hour the sound has returned,I then rev the engine in neutral again and the sound disapears.The oil pressure,charging rates,coolant temperatures and pefrformance are all good.The car was garaged and not used for about a year before I bought it.I have change the engine oil and filter,Red Line 5-30 previously the engine was filled with 10-30.I have changed air filter and all levels are good.When the engine oil was changed it was overfilled by a quart though that has now been rectified.
The question is why does the sound disapear when I rev the engine,and what could the possible causes be,I live in Spain europe,and no garage over here has any idea about Corvettes,they dont have Tech 11 or workshop manuals as GM has pulled out of Spain.
 

Paul Douglas

Active member
Joined
May 5, 2005
Messages
27
Location
Tyler, TX
Corvette
2002 Quicksilver Coupe
Cold engine ticking

Have you resolved this issue? I have a 2003 recently purchased it and it may have started after the oil change.

As stated before, my car has done this since new when cold. Very quiet when warmed up. Now 129,000 miles and still great.

Paul
 

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