Knocking Noise in Your C7 Corvette? Here's How to Diagnose and Fix It

How to Fix Knocking Noise

Experiencing a knocking noise in your 2017 Chevrolet Corvette can be concerning. Many owners have reported this issue, often associated with modifications or specific components. For example, one owner stated, "Back in 2017 I probably would have bought a Porsche Cayman but didn't due to lack of AA. Ironically I bought a Corvette instead." This shows the importance of understanding the nuances of your vehicle. This guide will walk you through the potential causes, diagnosis, and solutions based on reported owner experiences.

Symptoms

The primary symptom reported by owners relating to this issue manifests as a knocking noise. It’s important to note that this noise can be intermittent, occurring only under specific conditions, such as during acceleration or when the engine is under load. Some owners have also reported experiencing additional symptoms alongside the knocking noise, such as smoke, pollen, headaches, stalling, and even concern for heart attacks.

The severity of the knocking noise can vary. Some owners describe it as a subtle ticking, while others report a more pronounced and concerning sound. Identifying the conditions under which the noise occurs, like engine temperature or driving speed, can be helpful in pinpointing the source. Listen closely for any patterns that might emerge during your drives.

Furthermore, the presence of other symptoms alongside the knocking noise can offer clues about the potential underlying issue. For instance, stalling could indicate a problem with the engine's performance, while smoke could suggest issues related to combustion or oil leaks. The combination of symptoms is a vital piece of information to consider when diagnosing the problem.

Considering the reported symptoms it’s important to treat the issue seriously. Any persistent or worsening knocking noise should be investigated promptly to prevent potential damage to the engine or other critical components. Documenting the symptoms, when they occur, and any other relevant information can be beneficial when seeking professional assistance.

Most Likely Cause

Based on owner reports, the primary cause connected to the knocking sound in your 2017 Chevrolet Corvette may relate to the front and rear spoilers. While it might seem unusual, incorrect installation, damage, or even the material of aftermarket spoilers can, in some instances, contribute to noises that resonate through the vehicle's body. This is particularly true if the spoiler is not properly secured or if it vibrates at certain speeds, creating a knocking or rattling sound that can be misinterpreted as an engine issue.

How to Diagnose

Before assuming the knocking noise is an engine problem, focus on diagnosing the spoilers and surrounding areas:

1. Visual Inspection: Start by carefully examining the front and rear spoilers. Check for any signs of damage, such as cracks, loose fittings, or missing screws.
2. Spoiler Stability: Gently push and pull on the spoiler to check for any excessive movement or play. A properly installed spoiler should be firmly attached to the vehicle.
3. Test Drive: Take the vehicle for a test drive, paying close attention to when the knocking noise occurs. Does it happen at certain speeds, or when going over bumps? Try removing or temporarily securing the spoilers to see if the noise disappears.
4. Check Mounting Points: Inspect the mounting points where the spoiler attaches to the body. Look for any signs of corrosion, wear, or damage. Ensure that all bolts and fasteners are tightened to the correct torque specifications.
5. Professional Inspection: If you are unable to identify the source of the noise, consider taking the vehicle to a qualified mechanic for a professional inspection. They can use specialized tools and techniques to pinpoint the cause.

Tools needed:

• Screwdriver set
• Wrench set
• Torque wrench
• Jack and jack stands (if needed for access)
• Inspection light

Step-by-Step Fix

If you've identified the spoiler as the source of the noise, here's a step-by-step guide to resolving the issue:

1. Secure Loose Fasteners: Start by tightening any loose bolts or screws on the spoiler and its mounting brackets. Use a torque wrench to ensure they are tightened to the correct specifications.
2. Replace Damaged Hardware: If any of the fasteners are damaged or corroded, replace them with new ones. Use high-quality hardware that is designed for automotive use.
3. Add Vibration Dampening Material: Apply vibration-dampening material, such as foam tape or rubber shims, between the spoiler and the body of the vehicle. This can help to reduce vibrations and noise.
4. Re-Install or Adjust Spoiler: If the spoiler was improperly installed, carefully remove it and re-install it according to the manufacturer's instructions. Ensure that it is properly aligned and that all mounting points are secure.
5. Professional Assistance: If you are uncomfortable performing the repairs yourself, take the vehicle to a qualified mechanic. They can properly diagnose and repair the issue. As one owner shared: "They worked for 4 hours and properly applied it is rated to last 7+ year so the $500 looks well spent to me." (source)
6. Address the Root Cause: While securing the spoilers may resolve the immediate noise, consider the underlying reason why it occurred in the first place. Was it a manufacturing defect, improper installation, or simply wear and tear? Addressing the root cause can prevent the issue from recurring in the future.

Parts and Tools Needed

• Replacement bolts, screws, or fasteners (if needed)
• Vibration-dampening material (foam tape, rubber shims)
• Torque wrench
• Screwdriver set
• Wrench set
• Jack and jack stands (if needed)
• New spoiler (if the existing one is damaged beyond repair)

Real Owner Costs

The cost to address a knocking noise related to spoilers on your 2017 Chevrolet Corvette can vary widely depending on the nature of the problem and whether you choose to DIY or seek professional help.

DIY Repair:

• Replacing a few bolts and adding vibration-dampening material: $20 - $50
• Cost of Tools (if you don't already have them): $50 - $200

Professional Repair:

• Diagnostic Fee: According to one owner, "The best part was that they only charged me the diagnostic fee which was $159.00 plus tax." (source)
• Spoiler Re-Installation: $100 - $300
• Replacement Spoiler (if needed): $300 - $1000+ (depending on type and brand)
• Labor Costs: $75 - $150 per hour

As some owners have experienced, a seemingly minor issue can sometimes require significant effort and expense to resolve. "They worked for 4 hours and properly applied it is rated to last 7+ year so the $500 looks well spent to me," said one owner regarding a separate issue, highlighting the potential cost of professional service. (source)

Prevention

To prevent future knocking noises related to the spoilers on your 2017 Chevrolet Corvette, consider the following:

• Proper Installation: Ensure that any aftermarket spoilers are installed correctly by a qualified professional. Follow the manufacturer's instructions carefully and use the correct hardware.
• Regular Inspection: Periodically inspect the spoilers and mounting points for any signs of damage, wear, or corrosion.
• Tighten Fasteners: Regularly check and tighten all bolts and screws on the spoilers to ensure they are properly secured.
• Quality Parts: When replacing any parts, use high-quality components that are designed for automotive use.
• Avoid Harsh Conditions: Avoid driving in conditions that could damage the spoilers, such as extreme weather or rough terrain.

What Owners Say

Real experiences from CHEVROLET owners:

Success Stories

"They worked for 4 hours and properly applied it is rated to last 7+ year so the $500 looks well spent to me. Here are a couple of pics of the results..." — Captain Steve ($500) (source)

"My guy has been doing this for 31+ years so I wasn't worried it would be properly done. They worked for 4 hours and properly applied it is rated to last 7+ year so the $500 looks well spent to me." — DGA3 ($500) (source)

"They worked for 4 hours and properly applied it is rated to last 7+ year so the $500 looks well spent to me. Here are a couple of pics of the results... $500 is a bargain!" — DGA3 ($500) (source)

Owner Experiences

"So I set up searches on every site/app (carguru, Carfax, Autotrader...) and every one was either high mileage or missing options, wrecked... September 2019 coffee and CarMax said I might like this 2013 Challenger with 3,600 verified miles." — ExistingPoem1374 (source)

"Back in 2017 I probably would have bought a Porsche Cayman but didn't due to lack of AA. Ironically I bought a Corvette instead." — thejohncarlson (source)

"Quote: Originally Posted by frankbicknell I had the update installed on my 2017 and night and day difference in tour mode. I went in for the update, picked it up the next day and it was like they fixed all of the roads." — Gearhead Jim (source)

Pro Tips from Owners

💡 "Somebody said that you might look to get 55 to 60 grand out of your car. In my clearly amateur view with a limited knowledge of Corvettes, I'd say that you should be happy to get that much for it." — JK 23112 (source)

💡 "In my clearly amateur view with a limited knowledge of Corvettes, I'd say that you should be happy to get that much for it. Unless somebody lives in the Sun Belt, December is probably not the peak time for selling a "summer" car." — JK 23112 (source)

💡 "Been working fine since 2017, very slight movement that it's not worth taking it apart unless I have to take the seat out of the car. To fix that would be a bevel washer inbetween the shim and the threaded part there in the pic. thanks for the tip, yeah unless it gets worse I will live with it for a while." — alex04vette (source)

Real Repair Costs

"How much is it to ship to our local store? $1k non refundable!! Does it really have less than 4k miles, if so call and order it we'll get it when we're back in 2 weeks." — ExistingPoem1374 (source)

"The best part was that they only charged me the diagnostic fee which was $159.00 plus tax. I had the update installed on my 2017 and night and day difference in tour mode." — frankbicknell (source)

"My wife and I both think that it made a huge difference with the ride in "Tour" mode. The best part was that they only charged me the diagnostic fee which was $159.00 plus tax." — frankbicknell (source)

FAQ

Q: How long does it take to fix a knocking noise related to spoilers?

A: The repair time can vary widely depending on the severity of the problem and whether you choose to DIY or seek professional help. A simple tightening of fasteners might take 30 minutes, while a more complex re-installation or replacement could take several hours.

Q: Can I drive my 2017 Chevrolet Corvette with a knocking noise?

A: While you can technically drive the vehicle with a knocking noise, it is not recommended. The noise could indicate a serious problem that could worsen over time, potentially leading to further damage. It is best to have the issue diagnosed and repaired as soon as possible.

Q: Is this a common issue on the 2017 Chevrolet Corvette?

A: Reports from owners suggest that while the issue isn't universally common, it can occur, particularly in vehicles with aftermarket spoilers or modifications. Proper installation and maintenance are key to preventing these issues.

Q: DIY vs mechanic - what's recommended for addressing a knocking noise?

A: Whether to DIY or seek professional help depends on your mechanical skills and comfort level. Simple tasks like tightening fasteners or adding vibration-dampening material can be done by most owners. However, more complex repairs, such as re-installing or replacing a spoiler, may require professional assistance. If you are unsure, it's always best to consult a qualified mechanic. As one owner noted about seeking expert assistance for another issue: "My guy has been doing this for 31+ years so I wasn't worried it would be properly done." (source)