Skip the auto shop - Our mechanics make house calls

Q: F-150 will not run when it is over 70 degrees

asked by on

F-150 1994 with a 302 V8. If it's over 70 degrees ambient air temperature, it won't run. If it's below 70, it runs just fine. Have you ever heard anything like this?

A: I see stuff like that all the time. A lot o...

I see stuff like that all the time. A lot of times it’s the temperature sensor for the computer that has gone bad. It tells when the engine is hot and when it’s cold. If it gets too hot outside, it might be shortened out, giving the wrong temperature. Then it gives the wrong amount of fuel to the engine. Then the thing just shorts out. Check that first and also you might have to get the main computer checked, because I’ve seen many computers, sometimes when it gets too warm, they just start to short out. It could be the main computer too. Have the car inspected in person by a technician, such as one from YourMechanic, they will be able to determine if there is an overheating issue that is causing a problem.

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

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: Car only starts sometimes; problem with PCM computer

If the PCM has a problem, just about everything on the vehicle can be affected. I would have your vehicle inspected by a qualified engine technician in order to diagnose your starting issue and your PCM. It may be possible...

Q: Temperature Warning Light on

This light indicates that your engine has exceeded the safe operating temperature. There are many potential causes for engine overheating, from a failed water pump, to a blown head gasket. Whatever the cause, allowing your engine to overheat can do...

Q: Was driving my F150 home at night, my lights got dim and it died at a stop light, tried to jump it, had it running again but when

Hi there. Most of the time, this type of issue is caused by a malfunction within the alternator or charging system. It's possible that an electrical connection or relay that transfers power from the alternator to accessories is damaged, or...

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.