Diagnostics
Car Won't Start? The Sound It Makes Tells You Where To Look
Before you buy a battery, listen. Silence, a single click and a healthy crank that never fires are three completely different problems.
Before you buy a battery, listen. Silence, a single click and a healthy crank that never fires are three completely different problems.
A car that will not start is one problem with three very different causes, and the good news is that your car tells you which one it has. You just have to listen before you start spending.
Turn the key or press the button and pay attention to exactly what happens. There are three categories, and they lead to three different places.
No dash lights, no click, no sound, nothing. Or dash lights that come on and then die the moment you try to crank.
This is almost always a power delivery problem. The usual suspects, in order of likelihood:
Before assuming the battery, grab the battery cables and try to twist them by hand. If either moves, you may have found your problem for free. Look for white or blue-green crust on the terminals, which is corrosion and adds enough resistance to stop a car starting.
Here it matters a great deal whether you hear one click or many.
A single loud click, with bright dash lights that stay bright, usually means the starter solenoid engaged but the starter motor did not turn. That points at the starter itself, the solenoid, or the heavy cable feeding it.
Rapid machine-gun clicking means the opposite. The solenoid is trying to engage repeatedly and collapsing each time because there is not enough current. That points at a flat battery or a bad connection, not at the starter.
One old trick that is genuinely diagnostic: if the car has a starter that only sometimes engages, and a firm tap on the starter body makes it work, the starter's brushes or solenoid contacts are worn. That is not a repair, it is a countdown, and you should treat it as one.
This is the most important one to recognise, because it means your battery and starter are fine. The engine is spinning at a healthy speed. The problem is that it is not getting what it needs to run.
An engine needs three things, at the right time: fuel, spark and compression.
The classic expensive mistake goes like this. Car will not start. Someone buys a battery. Car starts. Two days later it is dead again, because the alternator was never charging it. Now you own a battery you did not need and you still have the original problem.
Ten minutes of testing separates battery from alternator from starter definitively. Guessing does not.
This is the single best argument for a mobile mechanic. The conventional path for a no-start is a tow, then shop labour, then getting yourself back to collect the car. We come to the car and diagnose it where it sits, and the large majority of no-starts are fixed on site: batteries, terminals, cables and grounds, starters, alternators, relays, fuses, coils and sensors are all realistic driveway repairs.
If the answer genuinely is a snapped timing belt or an in-tank fuel pump, we will tell you plainly that it needs a shop, and at least you will be paying for a tow to the right place for a known reason. See mobile no-start diagnosis.
Oil, brakes, batteries, AC, diagnostics and no-starts, done in your driveway across Orlando, Lake Nona, St. Cloud and Kissimmee. Upfront price before we start.