Puzzled at why your car engine is cranking slower than usual?
Are you looking for guidance on possible checks you can do yourself to narrow down and possibly get your car starting again?
There are several possible reasons why your car engine may be cranking slowly and not starting.
Fortunately, some of these causes may be easily addressed by yourself.
This post lists the possible reasons why your car engine may be cranking slower than normal and suggests some checks and suggests fixes that may help you get your car working again normally.
Why your Car engine may be Cranking Slowly and not Starting (5 Reasons)
Here are some common reasons why the car engine may be cranking slowly:
#1. The car battery may not be sufficiently charged
Is the battery sufficiently charged? A quick test you can do is check the car battery state of charge to measure its voltage with a good quality voltmeter.
Ideally, you’d want the car battery voltage to read above 12.4V and higher.
If the battery voltage is significantly lower, say under 12V then it can be the cause of the slow cranking and failure of the engine to start.
The car battery needs to be sufficiently charged to provide enough power to the starter to turn the engine over.
#2. Loose or weakly connected battery and ground cable connections. Confirm that all battery cables make good firm and clean contact with the battery posts.
This is often overlooked but has been found to be a cause of several car starting problems.
With loose battery connections, the current flow from the battery to the starter motor is restricted and not enough for the starter to turn the car engine over.
Additionally, check for and remove any no corrosion on the battery terminals.
Also, check that the ground cable is properly connected.
With a good quality voltmeter, measure and compare the voltage reading between 1) the negative battery post and the car chassis or engine block and 2) the battery terminal connected to the negative battery post and the chassis.
If you have a solid, good ground connection to the battery, both readings should be the same otherwise check for loose or damaged cables. The cables may need to be replaced.
#3. Check the cable connections to the starter and the starter itself. Loose starter cable connections cause voltage drops in the car starter circuit that can also result in slow cranking.
You can check for voltage drops by asking a qualified car mechanic to run a starting voltage test.
A faulty starter likely with cars that have done over hundreds of thousands of miles can also cause slow cranking.
You may also be interested in Why the car starter may be drawing large currents
#4. Confirm that there is voltage at the spark plugs and they spark. The car spark plugs may not be receiving sufficient battery voltage or may be due for a replacement.
Spark plugs need to work well and receive sufficient battery voltage to start the car.
If you have the skills, you can confirm if they receive sufficient voltage and spark or consult a qualified car mechanic for support.
#5. The car fuel pump may be faulty. Does the car fuel pump work well? Is it building up enough fuel pressure?
The car will not start if the fuel pump is faulty. Consult a qualified mechanic.
You may also be interested in Why the car may be turning over too fast
There are several checks you can do if the car engine is turning over slowly and the engine is not starting.
Listed starting with the simplest, check the battery voltage, battery cable and ground connections, starter and its connections.
Other possible causes of the car not starting are faulty spark plugs or a bad fuel pump.
Hope this helps!