Why is My 2020 Corvette Stalling? (And How to Fix It)

How to Fix Cam Issues

Experiencing chop, stalling, or other unusual engine behavior in your 2020 Chevrolet Corvette can be frustrating. Many owners have encountered similar issues, often related to the cam and its associated components. "Verdict is in...50min start to finish to remove intake, replace cam sensor and install intake. Come to find out some of my intake bolts were only "snug" lol," said one owner, highlighting a common issue related to intake leaks (smitty2919). This guide provides insights and potential fixes based on owner experiences.

Symptoms

Owners of the 2020 Chevrolet Corvette have reported a range of symptoms that can point to cam-related problems. These often manifest as unusual engine behavior, impacting the overall driving experience. Recognizing these symptoms early is crucial for timely diagnosis and repair.

One common symptom is a noticeable "chop" in the engine's idle. This refers to an uneven or rough idling condition, where the engine doesn't maintain a smooth and consistent RPM. It might sound like the engine is struggling or misfiring, and it can be especially noticeable when the vehicle is stationary.

Another symptom reported by Corvette owners is stalling. This is when the engine unexpectedly shuts off, often at low speeds or when coming to a stop. Stalling can be a safety concern, particularly in traffic. The frequency and conditions under which stalling occurs can provide valuable clues.

Finally, owners have also described experiencing what they call "ears," likely referring to unusual noises emanating from the engine. These noises could be clicking, ticking, or knocking sounds, which often become more pronounced as the engine warms up. These audible symptoms can indicate wear or damage to the cam or related parts.

Most Likely Cause

Based on owner reports, the primary cause of cam-related issues in the 2020 Chevrolet Corvette appears to be an intake leak. An intake leak occurs when there is an unsealed connection in the intake manifold system, allowing unmetered air to enter the engine. This disrupts the air-fuel mixture, leading to various engine performance problems.

The intake manifold is responsible for distributing air to the cylinders, and any leak in this system can significantly impact the engine's ability to run smoothly. The presence of an intake leak can lead to a lean condition, where there is too much air and not enough fuel in the combustion mixture. This can trigger various sensors and result in symptoms like rough idling, stalling, and decreased fuel efficiency.

Furthermore, intake leaks can affect the cam sensor readings, potentially triggering diagnostic trouble codes (DTCs) related to the cam position. This occurs because the engine control module (ECM) relies on accurate sensor data to properly control the engine's timing and fuel delivery. As [email protected] noted, "Downside is I STILL have P0342 code immediately after a second start. I then proceeded to remove the intake AGAIN so I could access the plug and test it for continuity/voltage etc." ([email protected]) This quote illustrates how an intake issue can directly affect cam sensor performance.

How to Diagnose

Diagnosing an intake leak in your 2020 Chevrolet Corvette requires a systematic approach. Here's a step-by-step guide to help you identify the source of the leak:

1. Visual Inspection: Begin by visually inspecting the intake manifold and its surrounding components. Look for any obvious signs of damage, such as cracks, loose connections, or deteriorated gaskets. Pay close attention to the areas where the intake manifold connects to the cylinder heads.

2. Listen for Vacuum Leaks: With the engine running, listen for any hissing or whistling sounds near the intake manifold. These sounds can indicate a vacuum leak. You can use a length of hose as a stethoscope to pinpoint the exact location of the leak.

3. Smoke Test: A smoke test is an effective way to identify intake leaks. Connect a smoke machine to the intake system and introduce smoke into the manifold. Observe where the smoke escapes, indicating the location of the leak.

4. Carburetor Cleaner Test: Spray carburetor cleaner or brake cleaner around the intake manifold gaskets and vacuum lines while the engine is running. If the engine's idle speed changes when you spray a particular area, it indicates a leak in that area. Be cautious when using flammable cleaners around a hot engine.

5. Scan for Diagnostic Trouble Codes (DTCs): Use an OBD-II scanner to check for any DTCs related to the intake system or cam sensor. Codes such as P0171 (System Too Lean) or P0342 (Camshaft Position Sensor Circuit Low) can provide valuable clues.

Tools Required:

• OBD-II scanner
• Smoke machine (optional)
• Carburetor cleaner or brake cleaner
• Socket set and wrenches
• Screwdrivers
• Flashlight
• Hose for listening for vacuum leaks (optional)

Step-by-Step Fix

Addressing an intake leak on your 2020 Chevrolet Corvette typically involves replacing the intake manifold gaskets and ensuring all connections are properly sealed. Here's a detailed step-by-step guide:

1. Disconnect the Battery: Before starting any work, disconnect the negative battery cable to prevent electrical shorts.

2. Remove the Intake Manifold: Carefully remove the intake manifold by disconnecting all necessary hoses, vacuum lines, and electrical connectors. Refer to your vehicle's repair manual for specific instructions. As one owner shared: "Verdict is in...50min start to finish to remove intake, replace cam sensor and install intake. Come to find out some of my intake bolts were only "snug" lol." (smitty2919). This highlights the need to check all bolts and connections.

3. Inspect the Intake Manifold: Check the intake manifold for any cracks, warping, or damage. Replace the manifold if necessary.

4. Clean the Mating Surfaces: Thoroughly clean the mating surfaces on the cylinder heads and the intake manifold. Remove any old gasket material or debris.

5. Install New Intake Manifold Gaskets: Install new intake manifold gaskets, ensuring they are properly aligned.

6. Reinstall the Intake Manifold: Carefully reinstall the intake manifold, making sure all hoses, vacuum lines, and electrical connectors are securely attached.

7. Torque the Bolts: Torque the intake manifold bolts to the manufacturer's specifications. Use a torque wrench to ensure proper tightening.

8. Check for Leaks: Start the engine and check for any vacuum leaks around the intake manifold. Use the carburetor cleaner test or a smoke test to verify that the leak is resolved.

9. Reconnect the Battery: Reconnect the negative battery cable.

10. Clear DTCs: Use an OBD-II scanner to clear any DTCs that may have been stored in the ECM.

Parts and Tools Needed

• Intake manifold gaskets (Part number will vary depending on the specific engine configuration)
• OBD-II scanner
• Socket set and wrenches
• Torque wrench
• Screwdrivers
• Carburetor cleaner or brake cleaner
• Shop towels

Real Owner Costs

The cost of repairing an intake leak on a 2020 Chevrolet Corvette can vary depending on whether you choose to do it yourself or hire a professional mechanic.

DIY Repair:

• Intake manifold gaskets: $20 - $50
• Carburetor cleaner: $5 - $10
• OBD-II scanner (if needed): $30 - $100
• Total DIY cost: $55 - $160

Professional Repair:

• Labor: $200 - $500 (depending on the mechanic's hourly rate)
• Intake manifold gaskets: $20 - $50
• Diagnostic fee (if applicable): $50 - $100
• Total professional cost: $270 - $650

One owner's experience: "Something that I used quite a few of were these little brass wood working threaded inserts. On the lid here at the bottom I have already made the pockets for the hinges so that they would sit flush." (mccarley). This owner highlights the importance of having the right tools and parts for a successful repair.

Prevention

Preventing intake leaks in your 2020 Chevrolet Corvette involves regular maintenance and careful attention to detail. Here are some tips to help prevent this issue:

• Regularly Inspect Vacuum Lines: Inspect vacuum lines for cracks, wear, or damage. Replace any damaged lines promptly.
• Check Intake Manifold Bolts: Periodically check the intake manifold bolts to ensure they are properly torqued. Loose bolts can lead to leaks.
• Use Quality Gaskets: When replacing intake manifold gaskets, use high-quality gaskets that are designed for your vehicle.
• Avoid Overheating: Overheating can damage the intake manifold and gaskets. Ensure your cooling system is functioning properly.
• Follow Torque Specifications: When reinstalling the intake manifold, always follow the manufacturer's torque specifications. Over-tightening or under-tightening bolts can lead to leaks.

What Owners Say

Real experiences from CHEVROLET owners:

Owner Experiences

"If you're running bronze guides with stock rockers, with a .600ish" lift, 225° duration cam, expect valve guide life of 20,000-30,000 miles tops. I've been there-done that." — American Heritage (30,000 miles) (source)

"Quote: Originally Posted by grinder11 Stock rockers are fine if you're running PM guides, and don't put a ton of miles on you're car. If you're running bronze guides with stock rockers, with a .600ish" lift, 225° duration cam, expect valve guide life of 20,000-30,000 miles tops." — American Heritage (30,000 miles) (source)

"Quote: Originally Posted by mccarley This is the second part of my luggage stop repair / replacement. I came across a source for prefabbed pieces of fiberglass that is going to be very useful." — SamEYEam (source)

Lessons Learned

⚠️ "Downside is I STILL have P0342 code immediately after a second start. I then proceeded to remove the intake AGAIN so I could access the plug and test it for continuity/voltage etc." — [email protected] (source)

⚠️ "I always try to sell here on the Forum first, but more often I sell the parts either locally or on the auction site. Just so many scams to watch out for on the social sites." — MSG C5 (source)

FAQ

Q: How long does it take to fix an intake leak?

A: The time it takes to fix an intake leak can vary depending on your experience level and the complexity of the repair. For a DIY repair, it may take 2-4 hours. A professional mechanic can typically complete the repair in 1-3 hours. As one owner noted, removing the intake, replacing the cam sensor and reinstalling the intake took just 50 minutes. (smitty2919)

Q: Can I drive with an intake leak?

A: Driving with an intake leak is not recommended. An intake leak can cause poor engine performance, reduced fuel efficiency, and potential damage to the engine. It's best to address the issue as soon as possible.

Q: Is this a common issue on the 2020 Chevrolet Corvette?

A: While not an extremely common issue, intake leaks can occur on the 2020 Chevrolet Corvette due to gasket deterioration, loose bolts, or damage to the intake manifold. Regular maintenance can help prevent this issue.

Q: DIY vs mechanic - what's recommended?

A: Whether to DIY or hire a mechanic depends on your experience level and comfort level with automotive repairs. If you are comfortable working on your vehicle and have the necessary tools, a DIY repair can save you money. However, if you are not experienced or do not have the tools, it's best to hire a professional mechanic. Given the comments about bolts being snug, it may be best to get a professional.