Skip the auto shop - Our mechanics make house calls

Q: Car turns off while driving when heated, but starts and runs when cooled off - 1996 Jeep Grand Cherokee

asked by on

When I drive my jeep it will run with slow excelleration but when heated shuts off until it is cool. I replaced about a year ago just about everything thermostat position arm plugs

My car has 142000 miles.
My car's transmission is unknown to me.

A: This is often a sign of a failing ignition ...

This is often a sign of a failing ignition coil. As you may know, an ignition coil is made up of a series of coiled copper wires that create electrical current which is stored and then ultimately transferred to the spark plugs. This wound coil has a thin layer of insulation around it which can eventually be damaged or deteriorate due to heat and other wear and tear.

When this happens, occasionally the coiled wire is exposed, creating the potential for shorts to happen which can cause the coil to not function as it is intended to until it cools down. This is generally what causes the cycling of operation that you have described. I would recommend having a certified mechanic, such as one from YourMechanic, come to your location to determine why the car is turning off when heated.

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

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Not getting enough fire to turn over

Hello. If you suspect the ignition system's are to blame, you will want to start there. When was the last time you changed the spark plugs? Have the ignition cables or spark plug wires ever been replaced? You can test...

Q: Engine smoking from underneath.

Well the first thing I would suspect is the engine overheated. I would check the engine oil and coolant to make sure there is sufficient amount of each. I would then check the engine codes for a fault that can...

Q: Refusal to kick start

Hello. Knowing what kind of repairs have been done would've help a lot with diagnosing this issue. Most of the time this is due to an issue with the distributor failing. The distributor fails internally and causes this. It can...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...