I Have Spark Fuel And Compression But No Start, What To Do?

Anyone who owns a car has probably encountered the frustrating situation of a car that cranks but doesn’t start, even turning the key in the ignition several times. Don’t let your desperation prohibit you from logically determining why your vehicle cranks but won’t start.

Read the article below if you are suffering from the same problem that is “I have spark fuel and compression but no start”. This article will provide solutions to your problem.

Reasons A Car Cranks But Won’t Turn Over

The engine is energized by cranking the car, which engages the starter. When everything is working properly, the starter turns the flywheel, which rotates the crankshaft. When there is a hitch in the system, the car engine won’t continue to run after it “turns over” or cranks, and this operation is paused.

Sufficient fuel pressure, a properly timed spark, and adequate compression are all required for the engine to start normally. When it won’t start, one of these systems is usually to blame, while the starter system can also be to blame. Here are several frequent causes of an engine that cranks but won’t start, as well as some troubleshooting strategies to help you figure out what’s wrong.

1. Compression Is Inadequate

An engine needs four things in order to start running on its own: air, gasoline, compression, and spark. Low compression can make it difficult or impossible to start an engine, indicating that seals and gaskets are leaking. New valve seals, piston rings, and other components may be required to ensure that the engine can endure the high pressure required to run.

2. Problems With The Power Supply

A poor starter motor that requires a lot of amps to crank the engine and then doesn’t have enough electricity left to turn on the fuel injectors and ignition system is another probable issue. In this situation, you’ll probably notice that when you try to crank the engine, it makes a strange noise or doesn’t turn over at all.

Weak or corroded battery cables, as well as a fading battery, can all contribute to the issue. While revving the engine, use a multimeter to check the battery voltage. It should have a voltage of at least 10 volts.

When the automobile is turned off, visually remove and inspect each fuse’s wire for blown fuses. Replace them if they look to be in good working order, then turn the automobile ignition to “on” and check each fuse for electrical current flow with a test light. Replace any blown fuses with new ones purchased from an auto parts store.

3. System Of Protection

As an anti-theft security device, many new vehicles include an engine immobilizer. The car’s security system may have malfunctioned, causing the fuel or ignition systems to be disabled, or the key’s chip may have failed. Consult your automobile owner’s manual or the company that installed your alarm system for help troubleshooting a built-in security system.

4. Plugs With Bad Spark

If the engine has good compression and the fuel system is working properly, but it still won’t start, the spark plugs in your automobile may be defective. The air/fuel combination inside the engine’s cylinders is ignited by the spark plugs. Your car is powered by the explosion that occurs as a result of this.

Modern spark plugs can last 100,000 miles or longer before they need to be replaced, but they might fail sooner for a variety of reasons: Too much carbon buildup in the engine can cause your spark plugs to foul. Oil can also film the spark plugs and prevent them from operating if it seeps into the engine. It’s also possible that one of the components is malfunctioning.

5. Sensor For Crankshaft Position Failure

Not only does your car’s engine require a spark to start combustion, but that spark must also occur at precisely the appropriate time. If you start the engine too late or too early, the air/fuel mixture will not completely burn, decreasing performance and perhaps failing to start the engine at all. A defective crankshaft position sensor could be one of the reasons your spark plugs are firing wrongly. This sensor provides information to the computer in your engine on the position of all the valves and pistons at any given time. This information is then used by the ECU to calculate when the spark should be fired. The ECU will not know when to fire the sparks if this sensor fails, and the engine may not start

I Have Spark Fuel And Compression But No Start, How To Fix It?

Fortunately, even if it appears to be a major issue, it is usually a simple and straightforward issue to resolve. Let’s start with a quick look at how to remedy the situation.

1. Remove The Spark Plugs

In rare situations, fuel might soak the cylinder and spark plug, rendering the spark plug incapable of igniting the air-fuel mixture.
Remove the spark plugs and dry them if you suspect this. Install everything back together after cranking the engine for a while without spark plugs.

2. Charge The Battery Of Your Car

If you’ve checked everything on this list and the car still won’t start, it’s possible that the automobile engine only has enough electricity to turn the starter motor around – but not enough to fire up the rest of the ignition components.
To ensure that you do not run out of power, charge your car battery overnight, replace it, or borrow electricity from another vehicle.

Frequently Asked Questions

Here are some frequently asked questions about I have spark fuel and compression but no start:

1. What Does Not Ignite But Has Spark Compression And Fuel?

If the engine has good compression and the fuel system is working properly, but it still won’t start, the spark plugs in your automobile may be defective. The air/fuel combination inside the engine’s cylinders is ignited by the spark plugs. Your car is powered by the explosion that occurs as a result of this.

2. What Does Not Have An Ignition But Has A Spark?

I have spark, fuel, and compression but no start, image result for faq fr
It’s possible that your engine cranks but won’t start or operate because it’s having difficulties producing a spark, receiving gasoline, or creating compression. Problems with the ignition (for example, a damaged ignition coil) or fuel system (for example, a faulty fuel pump) are the most prevalent culprits.


If you don’t know where to start troubleshooting when your engine cranks but won’t start, it might be difficult to solve. This book will not only show you where to begin but will also assist you in developing your diagnostic strategy. And it reminds you of some easy-to-forget spots to investigate. So, most of the time, you’ll be able to pinpoint the issue by reading only this article.

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