Q: Won't restart after its been driven across town.

asked by on

When the engine is cold it starts fine, but when its hot, i have power but it wont even crank over. No noise, nothing at all happens just lights and illumination and radio works too.
My car has a manual transmission.

A: These symptoms are evidence of "heat s...

These symptoms are evidence of "heat soak" electronic failure - most likely the starter solenoid. The solenoid has an electrical fault that heat exaggerates. After being parked for a short period of time - 10-15 minutes, the solenoid absorbs enough engine and exhaust heat to expand, opening up wiring that already has a fracture.

Since the electrical winding is now "open", the circuit isn't completed when the ignition switch is turned to "Start", so no "click" or cranking action. The solenoid cools over time, the connection in the winding is restored, and the solenoid works again until it gets hot. The other possibility would be a similar fault in the ignition switch. I would recommend having a professional technician, like one from YourMechanic, perform an inspection of the starting issue so that this can be corrected.

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Interior lights don't work when doors are opened

Hey there, thanks for writing in about your 1990 Mercedes-Benz 300D. Typically there are a couple of different options in the interior light switches. There is usually an option to turn them on manually, or to have them come on...

Q: My ford 500 2007 leaked out the oil and shut down on the road. The leak is fixed but it wont start. What could be the problem

When you leaked out all the oil, the oil pressure was lost in the engine. This loss of pressure caused all the moving parts to be starved of oil and no longer lubricated. You most likely seized the engine bearings....

Q: I need to have a bad thermostat replaced.

Thermostats should not cause fluid to leak but will cause it to overheat. You should have your cooling system pressure tested to determine where the leak is coming from.

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.