Car periodically will not start first time

There are times when I cannot start the engine at first start, after about 2 or 3 it will start. Does not happen all the time, just once in a while. When it did not start, I can hear the humming when I was trying to start the engine. Also I noticed that one day weather temperature went down to 40 degree F, it didn't start right away either.
New battery and new starter, but been told from friends it might be a bad new starter?
No other parts on engine area had been replaced or serviced for a while.
Car runs fine otherwise.
Car is 2003.
Around 105K miles spark plugs were replaced
Around 11
Experienced mechanics share their insights in answering this question :
Hi there. From the description you have given, this may be difficult to diagnose being intermittent. I don’t believe this would be a battery or starter issue unless, the engine is turning over slower than it should. Assuming the check engine light is not coming on, leads me to believe the vehicle’s computer is not recognizing a fault. It could be a fuel pump in the beginning stages of failing. A fuel pressure test could, confirm a faulty fuel pump. I recommend having your vehicle’s intermittent hard starting be diagnosed and repaired by a certified technician from YourMechanic.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The most common reasons an INFINITI G35 won`t start are a dead battery, an alternator problem, or failed starter. Search our network of RepairPal Certified shops near you to speak with a technician about your issue.
2. Car Turns Over But Wont Start. If the engine turns over but still wont start, the issue may be caused by faulty spark plugs, lack of fuel pressure, or insufficient compression. However, it could be that the starter motor is too weak to crank the engine to life.
If the torque converter is broken, or if there is a low fluid level in the transmission, the converter will not do its job, and the car will be unable to maintain power at low speeds, which causes the engine to shut off. A defective TCS or torque converter solenoid can also cause this issue.
, the Infiniti G35 might be a good first car—but with a few caveats. costs and more power than a new driver can handle. On the plus side, Infiniti is renowned for its reliability—even once its models get into the six-figure mileage range.
The most common reason cars don`t start is a dead or faulty battery. Even though most cars run on gasoline, they all require electrical power to function. The starter that cranks your engine to start requires an electrical signal to fire. If something`s wrong with your battery, your car engine won`t turn over.
If your vehicle won`t start, it`s usually caused by a dying or dead battery, loose or corroded connection cables, a bad alternator or an issue with the starter. It can be hard to determine if you`re dealing with a battery or an alternator problem.
A thermostat that is stuck open can cause the engine to run colder than normal and turn on the check engine light. It may also cause poor fuel mileage and the heater to blow cool air. A thermostat that is stuck closed will cause the vehicle to overheat.
include: Rotting of the fuel filler neck hose, which can cause gas to leak onto the ground when refueling. Faulty brake light switches, which make the brake lights stay on even when the engine is off. Ticking or tapping noise from the engine due to a faulty timing chain.
As long as it gets regularly scheduled maintenance and isn`t driven too roughly, the Infiniti G35 should last for 200,000 miles and up to 13 years.
INFINITI has been known for its excellent engines, and this is one of its strengths. The G35 is no exception. It has an impressive 3.5L VQ35HR engine that delivers an excellent combination of power and performance. This engine is powerful enough to ease the G35 to the 300 hp mark.
This luxury sport coupe turned heads and became a true performance icon. Its legacy lives on in the Q50 sedan and Q60 coupe.
A difficult start could be due to a number of things, from a dying battery to a faulty starter. But if your vehicle has a hard time starting after sitting for just a few hours, it can cause an extra layer of confusion. When this happens, one of the most common causes is low fuel pressure.
The reason for your car taking longer to start can depend on a variety of conditions including weather, battery health, starter health, fuel pump health, and other factors. If your vehicle is slow to start, or if something seems to be wrong with your vehicle, it can be tricky to find the cause.
One common culprit for this problem is the crankshaft position sensor, which measures the position and speed of the crankshaft. The computer uses the information from this sensor to know when to fire the spark plugs. If the sensor isn`t working, the spark plugs won`t fire, keeping the engine from starting.
INFINITI Intelligent Key recognizes you on your approach. It lets you unlock the doors and trunk, and even start the engine without having to uncover your key. It customizes your stereo pre-sets, touch screen organization, drive modes, climate settings and more.
Symptoms Of A Failing Alternator

Hard starting or stalling engine: An underpowered battery (because the alternator isn`t charging) will have trouble starting the car. Dim or too-bright lights: A damaged alternator may deliver either too little or too much power to the headlights.

Symptoms Of A Failing Alternator

Hard starting or stalling engine: An underpowered battery (because the alternator isn`t charging) will have trouble starting the car. Dim or too-bright lights: A damaged alternator may deliver either too little or too much power to the headlights.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

My car will not start Intermittently. I purchased a new battery 2 weeks ago and yesterday the car wouldn’t start. Got a jump and
ANSWER : The issue you are having is probably due to an intermittent fault in the starter motor itself or a deficiency in the starter electrical circuit, for example a large voltage drop due to a poor ground or a high resistance connection. These issues can be readily diagnosed and resolved on a mobile basis if you request a hard starting diagnostic. If you request that diagnostic, the responding certified mechanic will get this resolved for you promptly. Based on Toyota’s Factory Service Manual, the battery should not be disconnected if the vehicle engine is running. The battery acts as a large resistive voltage sink and consequently taking the battery out of the circuit, while the alternator is still running, can create a voltage spike on the car’s electrical system which is not good for voltage sensitive components such as the engine computer. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

My car twice out of 4 times today would not start on the first time. Second time started fine. At 2 read lights it was sort of je
ANSWER : Hello, thank you for writing in. Your symptoms point towards an issue with fuel or spark. If you just had work done on the fuel system, you may wan to have your fuel pressure tested at the engine. This will let you know that the lines, filter, and pump are all working correctly. You should also have the ignition system tested. This would mean inspecting the spark plugs to make sure they are in good condition, and making sure the plugs are receiving spark. Testing for spark is best done with a simple spark tester that is inserted into the plug’s wire. If having trouble starting, turn the key to the "On" position before starting, and let it sit. This give the fuel pump a moment to prime. If you do not hear the faint buzzing of the fuel pump priming (you may have to listen closer to the fuel tank), then you may be having issues with the pump. Only further testing will tell. For more help with testing and repairs, contact our service department to schedule an appointment.

Replaced alternator on car 2 times each time shows it’s charging 14v let car run for a little bit then test drive and car voltage
ANSWER : There are reports that the replacement alternators will not communicate with the engine computer and will not charge correctly. I recommend using only the manufacturer approved replacement part. It can be new or remanufactured but approved for use in the vehicle. Some lower cost alternators on the aftermarket will have charging problems since they will not communicate with the ECM on the vehicle and will stop charging.

Map sensor car won’t start up good ?
ANSWER : Your MAP sensor is an important input for your computer. It helps determine the load on the engine to calculate the correct amount of fuel to inject. It sometimes takes a few seconds for the vehicle to realize that the sensor is not producing a good signal.

At that point, it will use other methods to determine the fuel rate, such as pre-programmed fuel maps, throttle position, etc. I would suggest replacing the MAP sensor and retesting. If you would like to have it checked first, a certified technician from YourMechanic will be able to scan your vehicle and test components to determine the root cause of your starting issue before making a repair.

Car periodically will not start first time
ANSWER : Hi there. From the description you have given, this may be difficult to diagnose being intermittent. I don’t believe this would be a battery or starter issue unless, the engine is turning over slower than it should. Assuming the check engine light is not coming on, leads me to believe the vehicle’s computer is not recognizing a fault. It could be a fuel pump in the beginning stages of failing. A fuel pressure test could, confirm a faulty fuel pump. I recommend having your vehicle’s intermittent hard starting be diagnosed and repaired by a certified technician from YourMechanic.

2006 malibu not starting, not turning over can hear relay clicking. First time removed battery cables retried car started then ag
ANSWER : What you are describing sounds like a faulty starter solenoid. A faulty starter solenoid will generally produce a clicking sound when turning the key. The starter solenoid is located on the starter and has internal electrical contacts that transmit electricity to the starter. As electricity is supplied to the starter a small gear comes out and engages the flywheel to spin the engine over as you turn the key. When this fails, it may cause a clicking sound and will not allow the starter to engage the flywheel when you turn the key. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

My car makes a squealing noise for the first mile I drive it after every time I start the engine. I suspect it’s break related
ANSWER : Hi there. A metal to metal sound coming from the rear of the vehicle is often caused by either the brake pads being worn out or a wheel bearing that is failing. It’s probably a good idea to have a professional mobile mechanic come to your location and complete a car is making a noise inspection to verify the source of this noise, so the right repairs will be made.

Oil leaking from under car and "remote control car" sound when car is first started for a few minutes until it warm up.
ANSWER : Hello,
There are a number of things that could make an engine noisy when starting up. Depending on the specific type of sound you are referring to, this will determine how to properly diagnose. If there is a bit of a hissing sound, this may be a sign of a vacuum leak. If this is more of a shrieking sound, this may be a sign of a worn out or out of adjustment serpentine belt. If there is a bit of a howling or growling sound, this may be a sign of a worn out or low on fluid power steering pump. A rattling or pinging sound may be caused by an ignition problem. An engine can ping (or knock) due to an improper combustion process. A "spark knock" is the result of combustion occurring too early. Early combustion can occur from carbon buildup inside the combustion chamber, a lean air/fuel mixture, and advanced ignition timing (spark plug firing too soon). A clattering type sound may be a result of improper lubrication in the valve train which could be a more serious problem and should be addressed as soon as possible. I would suggest having an expert from YourMechanic come to your location to diagnose and inspect your vehicle to ensure everything is in proper working order.