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Gents, I went ahead and did this. And after about 100 or so miles of driving, I am happy to report that this is worth doing. Cuts/muffles the sewing machine noise by about half, noticeable difference. For something that only takes the best part of 20 minutes to do, it's a no-brainer and I recommend it.
The stock carbon fiber hood is real thin! One sheet of fatmat fit perfectly with very little trimming required. I then cut out two small pieces to place in the bottom on either side of the heat extractor. With the stock felt cover snapped back in place, it looks very non-invasive and clean. As always, careful when working with plastic push tabs as they break easily.
If someone can figure out how to get some insulation between motor and firewall, I think we will be golden (it looks tight there)
It has been a few days; do you still like this solution? The M7 fluid is changed and Noico sheets arrived today. Time permitting I was going to do it tomorrow. Thought I'd double check and see if you would do this again. Thank you in advance!
It has been a few days; do you still like this solution? The M7 fluid is changed and Noico sheets arrived today. Time permitting I was going to do it tomorrow. Thought I'd double check and see if you would do this again. Thank you in advance!
Yes, cuts the ticking noise in half. Go ahead and do it, worth the 30 minutes.
Last edited by xxaarraa; Apr 11, 2017 at 01:10 PM.
Interesting that new fuel pump solved the ticking. Wondering if an early batch of DI pumps make that noise but they later fixed it? If so, I may hassle my dealer about it to see if he would replace it for me (I just ordered a 2017 Raptor from same dealer family, so if I have any pull with dealer, its right about now).
I did some digging, and it looks like there is a TSB out for this issue:
Anyone heard of this TSB? Says to replace fuel line.
UPDATE: I called my dealer and gave them the TSB number. The SA spoke to the foreman and the foreman said they will work with me. He said he hasn't seen this TSB before, but it sounded logical so he's happy to investigate. I plan to drop off the C7 in a few weeks when I am there to pick up the new Raptor from next door. Will keep everyone posted on what they do, and anything they replace.
Last edited by xxaarraa; Apr 11, 2017 at 04:37 PM.
Mine is a 2017, and to me that indicates this is ongoing. Interesting TSB.
Tonight I applied Noico underneath the hood liner. I did a before/after test in the garage and there's a noticeable difference. Think you're on to something here. Noico is cheap--$20 for 10 sq. feet on Amazon. I took my time removing the pins and entire liner, so about 90 minutes total.
No road test b/c it's pouring rain at the moment. Actual road test tomorrow, and I'll post results.
After about a 50 mile road test I concur this cuts the sound--in my case more than half. It's quieter than the C5. There is a resonant spot between approx 2300-2600 RPM that will always stand out, but I'm satisfied.
Interesting that new fuel pump solved the ticking. Wondering if an early batch of DI pumps make that noise but they later fixed it? If so, I may hassle my dealer about it to see if he would replace it for me (I just ordered a 2017 Raptor from same dealer family, so if I have any pull with dealer, its right about now).
I did some digging, and it looks like there is a TSB out for this issue:
Anyone heard of this TSB? Says to replace fuel line.
UPDATE: I called my dealer and gave them the TSB number. The SA spoke to the foreman and the foreman said they will work with me. He said he hasn't seen this TSB before, but it sounded logical so he's happy to investigate. I plan to drop off the C7 in a few weeks when I am there to pick up the new Raptor from next door. Will keep everyone posted on what they do, and anything they replace.
OK, I dropped the car off today for this TSB. Will update once I get it back on whether it solves/reduces the ticking.
OK, I dropped the car off today for this TSB. Will update once I get it back on whether it solves/reduces the ticking.
Alright gents, I got this TSB done. Good news and bad news.
Good news: it changes the 'frequency' of the ticking and makes it a higher 'rpm' i.e., the ticking is still there, but the sewing machine seems to be working at a faster pace, making the ticking less 'grainy' Somehow, this is less annoying to me than before.
Bad news: it still ticks.
Overall, the TSB is an improvement, but slight improvement only.
I don't know. A major miss by Chevy to not figure out sound engineering on one of their flagship products. Pisses me off. Taking the seats and carpets off and adding sound deadening to the inside cabin is on my list, so that will be my last attempt at reducing this ticking noise.
[QUOTE=xxaarraa;1594505094]Interesting that new fuel pump solved the ticking. Wondering if an early batch of DI pumps make that noise but they later fixed it? If so, I may hassle my dealer about it to see if he would replace it for me (I just ordered a 2017 Raptor from same dealer family, so if I have any pull with dealer, its right about I did some digging, and it looks like there is a TSB out for this issue:
Anyone heard of this TSB? Says to replace fuel line.
UPDATE: I called my dealer and gave them the TSB number. The SA spoke to the foreman and the foreman said they will work with me. He said he hasn't seen this TSB before, but it sounded logical so he's happy to investigate. I plan to drop off the C7 in a few weeks when I am there to pick up the new Raptor from next door. Will keep everyone posted on what they do, and anything they replace.[/
Last year my 2015 coupe started leaking fuel.My local Chevy dealer doesn't sell Corvette's so is not authorized to due warranty work. I live in Hilo Hawaii and there is only one dealer.
After a long hassle they took on the job. Thinking it would be an easy repair.Its a long story, after four weeks I got the C7 back.
The shop had to replace the entire fuel system.
Including a new high pressure fuel pump.[ 300 to 2000 psi.] The car has never run better and no noise. My car was built in Sept 2014 and has 20,000 fun miles on it. Maybe there is a problem with the early pumps or after 40 years of drag racing I have gone deaf and can't hear it.
Last year my 2015 coupe started leaking fuel.My local Chevy dealer doesn't sell Corvette's so is not authorized to due warranty work. I live in Hilo Hawaii and there is only one dealer.
After a long hassle they took on the job. Thinking it would be an easy repair.Its a long story, after four weeks I got the C7 back.
The shop had to replace the entire fuel system.
Including a new high pressure fuel pump.[ 300 to 2000 psi.] The car has never run better and no noise. My car was built in Sept 2014 and has 20,000 fun miles on it. Maybe there is a problem with the early pumps or after 40 years of drag racing I have gone deaf and can't hear it.
Good to know, congrats on getting the problem solved.
You would think its the early C7s, but there are folks on here with 2016s that complain of the same ticking. I don't know what to make of it. I have another DI car that is whisper quiet and have had another one in the past as well that didn't make any of this ticking noise. This is unacceptable by Chevy on their sports car.
Does anybody can figure out what makes the noise? I have this nerving loud tiking also on my 2014 C7.
Under the fuel pump is a plunger witsh roll on the cam and make alternative movement. Does this plunger work as an hydraulic lifter? Compensate the gap between roller and pump piston with oil pressure?
Or is the noise comming directly from the pump?
Why does it occure only when engine is hot? mine does only when engine at working temp. If it is the pump, why is it influenced by temperature?
If oil temp has an influence, is the plunger the problem and not the pump?
What say GM to this problem ? Difficult for me to ask (live in France)
Thanks for your help
Does anyone know what exactly is producing the noise? My 2014 Stingray makes this horriblr ticking (like damaged valve train) only when engine ist hot!
=> oil temp has an influence
=> does the plunger between the cam and the pump work as an hydraulic lifter? Compensate gap between cam and pump piston?
=> is the plunger making noise or only the pump? could the plunger have oil problem and produce ticking?
=> why has temperature an influence on the noise?
=> what says GM about this anormal noise? Change the pump? (difficult for me to ask, live in France)
