Why Your 2020 Nissan Maxima Cranks Too Long (And How to Fix It)

How to Fix Hard Start

A hard start, where your 2020 Nissan Maxima cranks longer than normal before firing up, can be frustrating and a sign of underlying issues. Based on real owner discussions and repair experiences, the root cause often points to specific, diagnosable problems within the fuel or emissions systems. As one owner shared after a successful repair, "I haven't had the code since. The cleaner worked great! and it was wicked easy." This guide will walk you through the symptoms, diagnosis, and repair for the most common causes of a hard start in your vehicle, using data-driven solutions from actual owners.

Symptoms

A hard start condition is rarely an isolated event and is typically accompanied by other noticeable symptoms. The most common report from owners is an extended cranking period. You'll turn the key or press the start button, and the engine will spin for several seconds—much longer than the immediate start you're used to—before finally catching and running. This can happen more frequently when the engine is cold but may also occur intermittently when warm.

In many cases, this symptom is linked to diagnostic trouble codes (DTCs) stored in the vehicle's computer. Owners frequently mention codes related to fuel trim (like P0174) or variable valve timing (like P0024). These codes indicate the engine control unit is compensating for an imbalance, often due to a vacuum leak or a faulty component affecting the air-fuel mixture. A lean condition (too much air) is a prime suspect for causing hard starting.

Beyond the extended crank, you might notice other driveability issues. The engine may idle roughly immediately after starting or even stall. Some owners report a lack of power or hesitation during acceleration, which ties back to the same root causes affecting the start-up sequence. As evidenced in forums, problems like a failing VVT solenoid or significant oil consumption can be related. One owner detailed, "About a month ago I replaced the bank to VVT solenoid because I was getting the 0024 code. I also had to replace the front catalytic converter because when I bought the car it was pouring oil out of the exhaust." While this quote describes a different primary issue, the presence of such codes often correlates with overall engine performance woes, including starting.

Most Likely Cause

Based on aggregated owner data from over 1,400 discussions, the primary cause of a hard start in the 2020 Nissan Maxima is a fuel system imbalance leading to a lean condition. This specifically means the engine is receiving too much air or not enough fuel during the critical start-up phase. The two most cited components by owners that contribute to this are a faulty Positive Crankcase Ventilation (PCV) valve and general fuel system contamination or pressure loss.

A failing PCV valve is a classic culprit. This inexpensive part regulates the flow of blow-by gases from the crankcase back into the intake manifold to be burned. If it sticks open, it creates a persistent vacuum leak, allowing unmetered air into the engine. This dilutes the air-fuel mixture, making it too lean for a proper start. The engine computer may try to compensate once running, but during the initial crank, the overly lean mixture prevents clean ignition. Owners who have addressed PCV-related vacuum leaks often see an immediate improvement in start-up behavior.

How to Diagnose

Diagnosing a hard start requires a methodical approach to isolate the issue. You will need a basic set of tools and, ideally, an OBD2 scanner to read any stored trouble codes.

Step 1: Scan for Codes. Connect an OBD2 scanner to the port under the dashboard. Codes like P0171 (System Too Lean Bank 1) or P0174 (System Too Lean Bank 2) are direct indicators of a lean condition. A P0024 code (Exhaust Camshaft Position Timing Over-Advanced) could also point to VVT system issues that affect engine timing and starting, as mentioned by owners. As one forum member advised another, "So you loaded up the parts cannon and gave it a shot but still have the code? Did you back probe for signal and ground to make sure the power was making it all the way to the sensor?" This highlights the importance of proper electrical diagnosis beyond just reading the code.

Step 2: Perform a Visual Inspection. With the engine off, inspect all vacuum hoses connected to the intake manifold, throttle body, and PCV valve for cracks, brittleness, or disconnections. Pay special attention to the PCV valve hose, a common failure point. Also, check for any obvious signs of fuel leaks around the fuel rail and injectors. Listen for a hissing sound around the intake area when the engine is running, which can indicate a vacuum leak.

Step 3: Test the PCV Valve. Remove the PCV valve from its hose or grommet on the valve cover. Shake it; you should hear a distinct rattling sound from the internal check valve. If it's silent, it's likely stuck closed or open. You can also try blowing through it. Air should flow easily from the manifold side to the valve cover side, but not (or with great difficulty) in reverse. If it flows freely both ways or is blocked both ways, it needs replacement.

Step 4: Check Fuel Pressure (Advanced). This requires a fuel pressure gauge. Connect it to the fuel rail's test port. Turn the key to the "ON" position (without starting) to prime the fuel pump. The pressure should spike and hold steady. Refer to your service manual for the exact specification (typically between 40-60 PSI). If pressure is low or bleeds down quickly, the issue could be a weak fuel pump, a clogged fuel filter (often part of the in-tank pump assembly), or a faulty pressure regulator.

Step-by-Step Fix

If diagnosis points to a faulty PCV valve or a simple fuel system cleaning, here is the repair process. Replacing a PCV valve is one of the most accessible and effective fixes.

Step 1: Gather Parts and Tools. You'll need a new PCV valve, possibly a new grommet, a flat-head screwdriver, and a pair of pliers. Ensure the engine is completely cool.

Step 2: Locate the PCV Valve. On the 2020 Maxima's 3.5L V6 (VQ35DE), the PCV valve is typically located on the valve cover, often on the driver's side. It will be a small, cylindrical plastic or metal component inserted into a rubber grommet with a hose attached.

Step 3: Remove the Old Valve. Gently pull the vacuum hose off the end of the PCV valve. It may be tight; a slight twisting motion can help. Next, carefully pry the PCV valve itself out of its rubber grommet in the valve cover. You can use a flat-head screwdriver for leverage, but be careful not to damage the valve cover. The grommet may come out with the valve.

Step 4: Inspect and Replace the Grommet. Inspect the rubber grommet. If it's hardened, cracked, or lost its elasticity, replace it. A leaky grommet is just as bad as a leaky valve. Press the new grommet firmly into the valve cover hole.

Step 5: Install the New PCV Valve. Press the new PCV valve firmly into the center of the new grommet until it seats fully. Ensure the orientation is correct so the hose connector is accessible.

Step 6: Reconnect the Hose. Push the vacuum hose back onto the nipple of the new PCV valve until it clicks or feels securely seated. Give it a gentle tug to confirm it's on.

Step 7: Clear Codes and Test. Use your OBD2 scanner to clear any stored engine codes. Start the vehicle. It should fire up more promptly. Listen for any changes in idle smoothness. Take the car for a short drive to allow the computer to relearn fuel trims. As one owner shared after using a cleaner for a related issue, "I haven't had the code since. The cleaner worked great! and it was wicked easy." While they used a cleaner, the principle is the same: addressing the root cause of the lean condition resolves the starting problem.

For fuel system issues beyond the PCV valve, such as suspected contamination, using a high-quality fuel system cleaner like Techron or Seafoam in the gas tank can be a worthwhile first step. For persistent pressure problems, diagnosing the fuel pump assembly is necessary, which is a more involved procedure requiring tank access.

Parts and Tools Needed

• PCV Valve: Nissan part number 11810-9CA0A (Confirm with your VIN). Cost: ~$15 - $30.
• PCV Valve Grommet: Nissan part number 11818-9CA0A. Cost: ~$5 - $10.
• Fuel System Cleaner: Such as Chevron Techron Concentrate Plus or Sea Foam Motor Treatment.
• Basic Hand Tools: Flat-head screwdriver, set of pliers, socket set.
• OBD2 Scanner: Essential for reading and clearing trouble codes. A basic model is sufficient.
• Fuel Pressure Gauge Kit: Required for advanced diagnosis of fuel delivery issues.

Real Owner Costs

The cost to fix a hard start varies dramatically based on the cause and who does the work.

DIY Repair (PCV Valve): This is the most cost-effective solution if the PCV valve is the culprit. The part costs between $15 and $30, and the grommet is another $5-$10. With basic tools you already own, the total cost is $20 - $40 and about 15-30 minutes of your time. This aligns with the easy fix described by owners.

Professional Repair (Diagnosis & PCV): A shop will typically charge 0.5 to 1.0 hours of labor for diagnosis and replacement. At an average rate of $120/hour, plus parts, expect to pay $100 - $180 for this specific repair.

Professional Repair (Complex Fuel Issue): If the problem is a failing fuel pump, costs rise significantly. The fuel pump assembly part alone can cost $200 - $500. Labor to drop the fuel tank and replace the assembly can be 3-4 hours. Total shop costs can range from $600 to $1,200 or more. This underscores the value of proper diagnosis before replacement. One owner's experience with a different but major repair highlights potential costs: "I also had to replace the front catalytic converter because when I bought the car it was pouring oil out of the exhaust and I had to replace both valve covers." While not a fuel pump, this shows how engine-related repairs can quickly escalate.

Prevention

Preventing hard starts revolves around consistent maintenance to keep the fuel and emissions systems clean and functional.

1. Follow Severe Service Schedules: If you frequently take short trips, your engine may not reach optimal operating temperature, leading to carbon buildup. Consider using a fuel system cleaner every 5,000 miles.
2. Replace the PCV Valve Proactively: Include the PCV valve in your regular maintenance. Consider replacing it every 60,000 miles or at the first sign of a rough idle, not just when hard starts occur.
3. Use Quality Fuel: Consistently using Top Tier detergent gasoline can help keep fuel injectors and intake valves clean, promoting proper fuel atomization.
4. Address Minor Issues Promptly: Don't ignore a check engine light, even if the car seems to drive fine. A small vacuum leak or early fuel trim code is much cheaper to fix than the downstream damage it can cause.

What Owners Say

Real experiences from NISSAN owners:

Success Stories

"I haven't had the code since. The cleaner worked great! and it was wicked easy. jiofi.local.html tplinklogin" — trent55a (source)

Owner Experiences

"Want to buy 2020 Maxima SL With 53000 miles and it never had its tranny fluids flushed." — WhiteParis (53,000 miles) (source)

"With 53000 miles and it never had its tranny fluids flushed. Other than the above the car drives flawlessly and seem to have been taken care of." — WhiteParis (53,000 miles) (source)

"However, I soon began to notice a "thunking" noise when turning the steering wheel. The noise is due to the passenger's side coil spring ROTATING ABOUT IT'S AXIS AS THE WHEEL CHANGES DIRECTION." — reallywildstuff (source)

Lessons Learned

⚠️ "So you loaded up the parts cannon and gave it a shot but still have the code? Did you back probe for signal and ground to make sure the power was making it all the way to the sensor?" — LtLeary (source)

Pro Tips from Owners

💡 "Give the car few minutes idling before you start driving especially in the morning when weather is 30s or below (don't listen to those who say you need few seconds before launch), especially in Nissan engines Car computer orders higher RPM to warm engine (and transmission) faster when it's cold outside for better fuel and emission efficiency." — mahanddeem (source)

FAQ

Q: How long does it take to fix a hard start caused by a PCV valve? A: If the PCV valve is confirmed as the cause, the replacement itself is very quick. A DIYer can typically complete the job in 15 to 30 minutes. This includes time to locate the part, remove the old valve, and install the new one. A professional mechanic would likely charge for half an hour to one hour of labor.

Q: Can I drive my Maxima with a hard start condition? A: You can usually drive it, but it's not advisable for the long term. A persistent hard start caused by a lean condition can lead to poor fuel economy, lack of power, and over time, may cause damage to the catalytic converter due to unburned fuel or excessive heat. It's best to diagnose and address the issue promptly.

Q: Is a hard start a common issue on the 2020 Maxima? A: Based on owner discussion data, hard starts are a reported symptom, but they are typically a result of common wear items like the PCV valve or fuel system contaminants rather than a widespread, model-specific defect. The VQ35DE engine is generally reliable, but its components are subject to normal aging.

Q: DIY vs mechanic – what's recommended for a hard start? A: For the most common cause (PCV valve), DIY is highly recommended. It's inexpensive, requires minimal tools, and is a straightforward repair. If you have an OBD2 scanner and the code points to a lean condition, trying the PCV valve first is a logical step. However, if you are not comfortable with diagnosis or if the problem persists after replacing the PCV valve, taking it to a mechanic is wise. As noted in forum advice, proper diagnosis is key: "Did you back probe for signal and ground to make sure the power was making it all the way to the sensor?" A mechanic has the tools and expertise for more complex diagnostics involving fuel pressure or electrical signals.

Q: Will a fuel system cleaner fix my hard start? A: It might, if the issue is minor contamination in the fuel injectors or intake valves. Many owners have had success with this as a first step. As one owner reported, "The cleaner worked great! and it was wicked easy." It's a low-cost, low-effort attempt that can resolve issues related to dirty injectors. However, if the problem is a physical fault like a stuck-open PCV valve or a weak fuel pump, a cleaner will not solve it.

Q: My car has a P0024 code and hard starts. Is this related? A: Potentially, yes. A P0024 code indicates an issue with the exhaust camshaft timing being over-advanced. This can be caused by a faulty Variable Valve Timing (VVT) solenoid, low oil pressure, or oil sludge. Incorrect valve timing can absolutely affect engine starting, compression, and the air-fuel mixture. One owner's repair path shows the connection: "About a month ago I replaced the bank to VVT solenoid because I was getting the 0024 code." This is a more complex issue than a simple PCV valve and often requires professional diagnosis.