No Start Diagnosis at Johnny's Automotive
A car that won't start is really two different problems. We sort no crank from cranks but won't fire first, then work the tree down to one named cause.
Why won't my car start?
Everything starts with one question: does the engine turn over? That single fork splits a no start into two completely different investigations, and getting it right in the first thirty seconds saves a lot of wasted work.
If it doesn't crank, we follow the path that carries power to the starter and the signal that tells it to run: battery condition and terminals, cables and grounds, the ignition switch, the neutral safety or clutch switch, the relay, and the starter circuit itself. Voltage drop testing along that path shows where the power is disappearing rather than which part looks oldest. Battery testing and starter behavior each have their own page on this site. What this page owns is deciding which of them you're actually dealing with.
If it cranks but never fires, the engine is missing one of three things: fuel, spark, or compression. We check fuel pressure and whether the injectors are being commanded, look for spark, and run a cranking compression test if the first two check out. A timing belt or chain that has jumped shows up here as well. Security and immobilizer faults get ruled out early, because a car that cranks strong and won't fire is sometimes just a key the car stopped recognizing.
On getting it here: if it won't crank at all, tow it. If it's starting sometimes, driving it in is a gamble, and a car that dies in a left turn lane costs more than the tow did. Call the closest of our six shops first and describe exactly what it does when you turn the key. What we hear on the phone sometimes changes the answer.
At the end you get the named cause and a written quote. The repair decision stays yours.
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Nothing happens when I turn the key
Dash lights on and total silence usually lands in the starting circuit rather than the engine: a discharged battery, corroded or loose connections, a bad ground, the ignition switch, or a car that thinks it isn't in park. Testing the path shows which link is broken.
It cranks over fine but never catches
The starter is doing its job, so the engine is missing fuel, spark, or compression. Fuel pump and injector signal, ignition output, and a cranking compression check sort those three quickly, and a jumped timing belt or chain shows up in the same test.
It was fine yesterday and dead this morning
Overnight failures usually mean something is draining the battery while the car sits, or a battery that has been marginal for a while and finally gave up on a cold morning. We measure the draw with the car asleep to tell those apart.
It jump started, then quit again down the road
That pattern points at the charging side rather than the start. If the alternator isn't keeping up, the car runs on stored battery power until there's none left, which is why it dies a few miles later instead of right away.
It cranks and the security light stays lit
A car that turns over strongly and refuses to fire, with a security or key symbol on the dash, is often an immobilizer that can't read the key. Worn key chips, a dead fob battery, or a fault in the reader all show up this way, and it's a quick thing to confirm.
It only does it when the engine is hot
Heat sensitive no starts are real and they're the reason we ask when it happens. Some starters and sensors work cold and quit once everything is heat soaked, so we try to reproduce the conditions instead of testing a cooperative car.
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Learn moreNo Start Diagnosis questions, answered
Common questions about our no start diagnosis services.
Should I have it towed or try to drive it in?
If it won't crank at all, tow it. If it starts on the second or third try, it can strand you in traffic, and a tow from your driveway is easier than a tow from an intersection. Call us before you decide and we'll talk through what it's doing.
It started for me this morning. Is it still worth bringing in?
Yes, and bring it in while it's still doing it. An intermittent no start almost never fixes itself, and the details you can give us (hot or cold, first try or fifth, any dash lights) narrow the search a lot. Waiting until it's fully dead only removes your options.
How do you tell a fuel problem from a spark problem?
By testing them separately rather than by symptom. We measure fuel pressure and check whether the computer is commanding the injectors, then confirm the ignition system is producing spark while the engine cranks. Whichever one is missing gets pursued, and if both are present we move on to compression.
I put in a new battery and it still won't start. What now?
A new battery rules out one link, not the whole circuit. Cables, grounds, the starter and its signal path, or a charging system that's been killing batteries can all produce the same symptom. That's the point of testing the path instead of replacing along it.
What do I actually get from a no start diagnosis?
The named cause, in plain language, and a written quote for the repair it calls for. If more than one thing is failing, you see all of it and what order it matters in. Whether we do the work is up to you.
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