Engine clatter?
Thread Starter
Drifting
Joined: Jan 2006
Posts: 1,554
Likes: 158
Engine clatter?
2015 C7 Z51,A8 with 1K miles. After todays joy ride pulled into home development. Children playing so I'm going slow. Radio off and windows are down. Noticed engine clatter that sounded a lot like a 70's Chevy solid lifter noise. After 10min. checked engine oil and it was 2/3 qt low but well within dip stick marks. Does the C7 motor have solid lifters? Is engine clatter noise normal at low RPM's? Thanks for your comments.
Burning Brakes
Joined: Apr 2015
Posts: 1,056
Likes: 277
From: Chattanooga, TN
2015 C7 non-Z51, A8 with 3K miles- I noticed a similar clatter noise yesterday as well.
Wonder if it's due to the lower temps (50s here at night)?
Or that I usually have the radio pretty loud and just don't notice it
Wonder if it's due to the lower temps (50s here at night)?
Or that I usually have the radio pretty loud and just don't notice it
Thread Starter
Drifting
Joined: Jan 2006
Posts: 1,554
Likes: 158
Don't know if the clatter is related to outside temperature. Temps are moderate so I don't think so. I usually have radio on and windows closed so I have not noticed noise. Car runs great and I think the noise is likely normal. 460 HP is not going to sound like a Volt. Nice sunny day here in Raleigh NC temp was low 60.
Burning Brakes
Joined: Sep 2015
Posts: 954
Likes: 269
From: San Jose
I would expect 8 injectors shooting fuel at up to 3000psi to make some noise.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 34,929
Likes: 12,342
From: NE South Carolina
2015 C7 Z51,A8 with 1K miles. After todays joy ride pulled into home development. Children playing so I'm going slow. Radio off and windows are down. Noticed engine clatter that sounded a lot like a 70's Chevy solid lifter noise. After 10min. checked engine oil and it was 2/3 qt low but well within dip stick marks. Does the C7 motor have solid lifters? Is engine clatter noise normal at low RPM's? Thanks for your comments.
Last edited by JerryU; Dec 4, 2015 at 08:33 PM.
Melting Slicks
Joined: May 2001
Posts: 2,596
Likes: 120
From: East Tennessee
My '14 C7 had something in the valvetrain that made a lot of noise at times. Lifter, rocker, whatever. At 2-3000rpm after some spirited driving it would clatter pretty bad. No it wasnt a DI/mechanical fuel pump noise, it was valvetrain.
It would come and go at idle as well. It didnt missfire or get really bad and in 10K miles it never changed much. Being around LS-type engines since 1997 its not out of the ordinary to have some valvetrain noise so I just shrugged it off. I would say my old '12 GS LS3 was noisier, at a McDonalds drivethrough it sounded like a V8 with misadjusted solid lifters.
This '16 is quiet so far, hope it stays that way.
It would come and go at idle as well. It didnt missfire or get really bad and in 10K miles it never changed much. Being around LS-type engines since 1997 its not out of the ordinary to have some valvetrain noise so I just shrugged it off. I would say my old '12 GS LS3 was noisier, at a McDonalds drivethrough it sounded like a V8 with misadjusted solid lifters.
This '16 is quiet so far, hope it stays that way.
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Instructor
Joined: Nov 2015
Posts: 121
Likes: 11
Since my car is all torn up now I asked them to check into that bell housing TSB it has to do with some bracket being bad and causing a clacking noise. Dealer said they would replace it under the TSB since it's all apart anyway. Check it out.
A rattle noise at the engine bell housing may be heard on some 2014-2015 Corvettes built with the 6.2L engine (RPO LT1) and an automatic transmission...
#13-04-17-001 – Driveline Support (Torque Tube) / Propeller Shaft Input to Front Hub Bearing Alignment
Document ID 3973764 – Driveline Support Assembly Replacement (with Automatic Transmission)
6.2L Engine Bell Housing Rattle
A rattle noise at the engine bell housing may be heard on some 2014-2015 Corvettes built with the 6.2L engine (RPO LT1) and an automatic transmission...
#13-04-17-001 – Driveline Support (Torque Tube) / Propeller Shaft Input to Front Hub Bearing Alignment
Document ID 3973764 – Driveline Support Assembly Replacement (with Automatic Transmission)
6.2L Engine Bell Housing Rattle
Last edited by WhiteA8C7; Dec 4, 2015 at 11:47 PM.
Thread Starter
Drifting
Joined: Jan 2006
Posts: 1,554
Likes: 158
Thanks guys, I am satisfied that the clatter like noise is from the injectors. After another short drive to warm the engine I opened the hood and could more clearly hear that the noise is coming from the center top area of the motor. Injectors doing their thing. Thank you all for your comments. Drive safe!
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 34,929
Likes: 12,342
From: NE South Carolina
Thanks guys, I am satisfied that the clatter like noise is from the injectors. After another short drive to warm the engine I opened the hood and could more clearly hear that the noise is coming from the center top area of the motor. Injectors doing their thing. Thank you all for your comments. Drive safe!
A forum poster with loud ticking posted that their dealer removed the manifold and found the insulation over the pump and injectors crumpled and not fitting properly. It was replaced.
As I said in a previous post, even with my 2 year old C7 hood open I do not hear significant ticking. However at 73 my high frequency hearing is not great! Although despite my wife's accusations about me not hearing her, a recent hearing test said my hearing comprehension was fine. In that case it is a "selective hearing problem!"
Last edited by JerryU; Dec 5, 2015 at 09:52 AM.
Safety Car
Joined: Jan 2015
Posts: 3,941
Likes: 499
From: Northern Virginia
I'm not sure I understand why the injectors would be louder when the weather and engine are cold than in warmer weather. But mine definitely has a lot more clatter when cold than when warmed up, or than it did in the summer.
I've got to get it up to the dealer to check out, I think.
I've got to get it up to the dealer to check out, I think.