Q: Won't start after it runs for a few minutes until I let it set for hours.

asked by on

Won't start after it runs for awhile. Have to let it set for hours.

My car has 100000 miles.
My car has an automatic transmission.

Hello - if the Check Engine light is on, getting the problem codes is the first task. Check also battery and ground cable connections for corrosion or loose connectors. Determining whether you are missing spark or fuel during these "hot start" attempts is the next level of diagnosis. Lack of spark could be a coil or ignition module failure. Lack of fuel or fuel pressure could be the fuel pump, fuel pump relay, or the fuel pressure regulator. I would recommend a inspection of the engine during one of these "no hot start" episodes

Was this answer helpful?

This is a common sign of a faulty ignition coil. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeatedly The insulation develops small fractures that open when heated and close when cooled. When open, they allow shorting of coil windings and decrease or eliminate the coil’s ability to function. This type of temperature cycling happens because every time you shut the engine off, the fan stops running, the coolant stops flowing and the temperature under the hood rises. Every time you start the engine again the coolant flows, the fans turn on, and the temperature drops. When this heat dissipates and is absorbed under the hood, it is trapped causing this cycling effect. Components that contain heat sensitive materials include parts like coils, injectors, igniters, and some sensors. Any of these may be potentially subject to this same kind of heat problem which can be very difficult to trace. I would recommend having an expert from YourMechanic come to your location to take a look at your vehicle to properly diagnose your ignition system.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Won't start after it runs for a few minutes until I let it set for hours.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car want start and when it do it shut down and want start until 30 minute or so. Now it want do nothing

When a car turns and won't start, it is called a "crank no start". When this occurs, the first thing you need to do is see what is missing. All internal combustion motors need spark, fuel, injector pulse and camshaft...

Q: Need O2 sensors replaced. There asking $1,500

Hi there: You might want to have a second opinion completed for your Dodge Durango air fuel mixture sensor replacement; as if they are simply replacing the O2 front and rear bank sensors; that's a bit pricey.

Q: Alternator not charging battery

Hi there. To be honest, when the alternator tests as good and the battery terminals are good, this issue is typically very difficult to diagnose. In most cases however, this is either an electrical relay fault to the charging system...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...