Skip the auto shop - Our mechanics make house calls

Q: When my car gets warm and I stop at a light or stop sign it shuts off only after car get warmed up I've changed a few things but

asked by on

I'm running out of options need a professional opinion! EGR sensor came up on computer I changed that problem still exists, I've changed fuel filter, didn't work still same problem. When car shuts off I have to wait 15 to 20 minutes for it to start back up. Fuel pump is fine so I'm at a standstill I do have a hole in my timing chain cover and bad oil leak and I'm guessing that's throwing off sensors, my second question is could bad sensors be causing all these problems?? I would greatly appreciate any help or feedback thank you

My car has 243281 miles.
My car has an automatic transmission.

Hi There, It sounds like you may have a failing ignition coil. The 15-20 minute gap in between when you are able to start your car sounds like something called heat cycling. This happens when ignition coils begin to fail due to excessive heat and shorting out. 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. 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 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
  • Home
  • Questions
  • When my car gets warm and I stop at a light or stop sign it shuts off only after car get warmed up I've changed a few things but

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: I have a 2007 mustang tr3650 need to know how to seprate the transmission from bell housing

Hi there. Typically I would use a floor jack to hold up the end of the trans and remove the cross member. After that, you can use a floor jack to raise or lower the tranny gain access to those...

Q: Right wind windshield wiper does not move while left one does.

The right windshield wiper arm is connected to the left wiper arm and transmission for the wiper motor. The most likely cause of the wiper arm not moving is the arm linkage came disconnected and will need to be reconnected...

Q: Brake lights not working

The most common problem in this scenario is that the brake light switch isn't sending the required power to the rear brake lights. I recommend having the switch checked to see if it's indeed defective and is the cause of...

Related articles

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.