6 Reasons Why Your Car Only Starts On the Second Try

It’s worrisome if your car doesn’t immediately start, especially if you’re in a hurry to get somewhere. The last thing you want is to be stranded because your vehicle won’t start, because sooner or later, whatever is causing it not to start on the first try will cause it not to start on the second, third or how many times you try.

With over 50 years in the auto repair industry, the complaint I have heard thousands of times was, my car doesn’t start, but then I turn the key off, and then it starts right up on the second try. There are numerous reasons why this can happen. My first question would be, does the engine crank over like it’s trying to start, or does it seem as if the battery is dead, where the engine just clicks or makes no sound at all?

With help from a General Motors master technician and my years of firsthand experience, we’ll share the most probable reasons why your car starts (hopefully) on the second try.

Is a Car Starting on the Second Try Bad?

Yes, a car not starting on the first try, but the second, is bad. Ever since the introduction of computer-controlled fuel injection and electronic ignition systems, an internal combustion engine (ICE) even in the coldest weather should start within two or three seconds. In fact, vehicles with auto start-stop technology are designed to restart in less than a half-second. Depending on the reason (mechanical malfunction, fuel system, ignition system, or electrical system), even if the engine does quickly start on the second try, it means something is wrong and needs to be fixed.

Additionally, cranking an engine for long periods of time weakens the battery, causes premature wear to the starter motor, and can stress other systems, including increased wear on engine components.

Reasons a Car May Start on the Second Try

There are several causes why a car may start on the second try rather than the first. To diagnose, there are a whole series of questions that need to be answered to help narrow down the problem and determine the appropriate repair, including, but not limited to:

• Was the engine hot or cold?
• Did the car sit overnight?
• Was the Check Engine Light or other warning lights on?
• Does the car idle and run okay otherwise?

Sometimes, there are DIY fixes to this problem, but here is info you can discuss with your mechanic if you need to visit the pros.

Fuel system

According to General Motors master technician Dave Zemaitaitis, the most likely cause of a car starting on the second try could be issues with the fuel system, likw “a weak fuel pump, a leaking fuel line pressure regulator valve or a fuel pump check valve will not hold pressure,” which “allows fuel to drain back into the [fuel] tank.”

Zemaitaitis suggests drivers “turn the key to the run position and listen if you can hear the fuel pump running.” This is referred to as the “two-second prime.” If you hear the pump running and your car starts on the second try, the fuel system is the most likely culprit. If your car has a pushbutton starter instead of a key, without your foot on the brake pedal, pushing the start/stop button will place your car into the “run” position.

Other fuel-related causes include a clogged or dirty fuel filter or excess carbon in the intake valves. Try replacing the fuel filter and decarbonizing the engine yourself. Soft carbon on the valves can absorb fuel, particularly in colder weather, decreasing its ability to ignite. The same can happen if you use low-quality, contaminated or high-octane fuel in an ICE car calling for 87 octane. Add a decarbonizing cleaner to the fuel tank and clean other components of the fuel/air intake system before taking your car in for service.

Battery

A failing battery, a battery with loose or corroded battery terminals, or low voltage can cause your engine to not crank over on the first attempt but start on the second try. Clean the battery terminals, and check the battery and charging system for proper voltage.

Ignition system

Weak ignition coils, worn or dirty spark plugs, or degraded spark plug wires can all prevent your engine from starting on the first try. Replacing spark plugs and spark plug wires are all DIY tasks. However, diagnosing and repairing coil-over plug ignition systems (they have no spark plug wires) is best left to your mechanic.

Starter motor

If your engine clicks on the first try and then starts on the second try, the started motor or solenoid may be bad. Try cleaning the ground cable that attaches from the negative (-) battery terminal to the engine block. Unless you are comfortable working under your car, leave starter repairs to your mechanic.

Dirty or malfunctioning computer sensors

Any number of sensors that send information to the Engine Control Unit (ECU) can cause all kinds of starting issues. For example, a failed coolant temperature sensor (CTS) can either flood an engine with too much fuel or starve the engine of fuel. Out of calibration, failing or dirty mass air flow (MAF) sensor, oxygen (O2) sensors, crankshaft or camshaft position sensors can keep an engine from firing up on the first attempt, while allowing it on the second try.

Check for trouble codes if you have a diagnostic code reader. Cleaning the MAF or replacing O2 sensors are DIY fixes. Leave crankshaft or camshaft position sensors to the pros.

Lack of maintenance

Sometimes, a dirty air filter can cause the engine to run with too much fuel, thick oil can keep an ICE from spinning fast enough to start, bad coolant can damage the CTS, or a dirty throttler body or idle air control (IAC) valve can affect the air-fuel mixture and hinder your car from staring on the first try. These are all basic DIY maintenance items to keep up with and ensure your car starts on the first try.

Meet the Expert

Dave Zemaitaitis has been a General Motors Master Technician for 23 years and currently works at O’Neil Buick/GMC in Warminster, PA., interview Dec. 16, 2024

Sources

Edmunds, “Do Stop-Start Systems Really Save Fuel?” (Dec. 16, 2024)

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