F-150 will not run when it is over 70 degrees
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?
Experienced mechanics share their insights in answering this question :
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.
How to Identify and Fix Common car Problems ?
Our sources include academic articles, blog posts, and personal essays from experienced mechanics :
The P0302 trouble code is an indication that cylinder 2 is misfiring and is not getting the necessary spark to its spark plug.
Ranging from 180F to 195F. You should use the thermostat with the “F” rating specific to your engine size.
Multiple misfires can be caused by many reasons from a faulty ignition system, fuel system, or internal engine failure. The most common reason for this to happen is faulty or worn-out spark plug coil packs, especially if it`s been a while since you had a tune-up.
Common reasons for this to happen:
A defective TCS or torque converter solenoid can also cause this issue. Low fuel pressure, dirty or defective fuel injectors, or broken fuel pump: The fuel pump is responsible for transferring fuel from the tank to the engine.
The failure of ignition system components is the leading cause of P0302 diagnostic trouble codes. As a result, one should begin diagnosing such a problem by thoroughly evaluating all relevant components. Begin by inspecting the engine`s number #2 spark plug for any damage or an incorrect gap.
Normal coolant temperature will be around 195 to 220 Fahrenheit (approx 90°C) and anything above or below this can start causing problems.
Notes: 180 °F (82 °C), Engine Coolant Thermostat.
The most common causes of misfires are worn, improperly installed, and mishandled spark plugs, malfunctioning ignition coils, carbon tracking, faulty spark plug wires and vacuum leaks.
What Does Code P0302 Mean? P0302 definition: Cylinder 2 misfire detected. Diagnosis: A multiple misfire can be caused by anything from faulty spark plugs to low engine compression.
Multiple reasons could trigger a code P0302 misfire, including a faulty spark plug, a bad ignition system, or a defective fuel injector.
P0302 Diagnostic Theory for Shops and Technicians
When the code P0302 is set in the Powertrain Computer, it means that the Misfire Monitor has detected more than a 2 percent variance in RPM between the firing of any two (or more) cylinders in the firing order.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
F-150 will not run when it is over 70 degrees
ANSWER : 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.
Runs fine for days then acts like running out of gas and then dies and try restart and runs then dies ,when I turn key on you hea
ANSWER : The fuel pump in the fuel tank is designed to have low pressure and high volume to feed the front fuel pump the right amount fuel. The front fuel pump supplies the engine with high pressure to the engine.
When you do not hear the pump run then the fuel pump is bad and should be replaced along with the relay. You should not have to replace the in tank pump if it is running. I’d suggest replacing the fuel filter as well.
I’d suggest getting this inspected by a qualified technician, such as one from YourMechanic, to diagnose your stalling issue and make the necessary repairs.
Vehicle started running rough while driving. Now running/idling rough running rich.
ANSWER : Hello. From the symptoms you describe, it would appear that your vehicle is having issues with the oxygen sensors. P0172 is the code for bank 1 being too rich. This can be caused by a wide variety of issues. The other two codes are for the sensors on bank 2, having excessively high voltage.
This may be due to the rich condition, faulty oxygen sensors, or faulty wiring. The black smoke and soot is a result of excessive fuel that is not being properly burned, and exiting the tailpipe as smoke. A few common causes for these symptoms are a bad fuel pump, fuel pressure regulator, or engine management sensor. As engine management systems can sometimes be difficult to diagnose, I would recommend having the rough idling issue inspected by a professional technician.
Truck runs rough in 80 to 90 degree weather
ANSWER : With the age of your vehicle, there are likely a few things that need to be maintained. All of the recommendations about to be made depend on what other repairs have been made recently. Since the issues are related to the ambient air temperature, you will want to start by checking your cooling system. The water pump and thermostat are two critical components that do age and will need to be replaced eventually. To test the water pump: feel the upper radiator hose while running (carefully, it will be warm), if you feel a good amount of coolant inside then the pump is functioning well. If it feels empty or like there is bad circulation, you will want to replace the pump.
You will want to make sure your coolant is topped off and in good condition. Another easy step to take is to flush the radiator. You will have to remove it and use whatever means you have to flush clean water through it. There are some mild solvents that will help to clear any coolant buildup inside. If you would like an expert to take care of this, a qualified professional from YourMechanic can come to your car’s location to inspect the rough idle and pinpoint needed repairs.
01 mustang v6 running rough at idle and drive. Please help. Replaced a bunch, still can’t figure out issue.
ANSWER : This may be a sign of a faulty MAP sensor as the vehicle responds adversely to a load put on the motor (i.e. putting it in gear, turning on AC or engaging the brakes). The Manifold Absolute Pressure (MAP) sensor senses engine load and generates a signal that is proportional to the amount of vacuum in the intake manifold. The engine computer then uses this information to adjust ignition timing and fuel enrichment. When the engine is working hard, intake vacuum drops as the throttle opens wide. The engine takes in more air, which requires more fuel to keep the air/fuel ratio in balance. When the computer reads a heavy load signal from the MAP sensor, it adjusts the fuel mixture to slightly more rich than normal so the engine can produce more power. The computer will then retard (back off) ignition timing slightly to prevent detonation that can damage the engine and decrease performance. This may also be caused by other closely related components such as a dirty or failing mass air-flow sensor, a faulty throttle position sensor or potentially a vacuum leak. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.
My car is running hot, what could be the problem?
ANSWER : There could be an issue with the cylinder head gaskets. Antifreeze can break down and become acidic if not replaced as normal maintenance. The head gasket material erodes and can cause engine compression to build up in the coolant system. This will prevent the flow of coolant which can create an overheating condition.
There is a test that can be done to check whether there is carbon monoxide in the coolant system; it involves special equipment.
I recommend having your overheating condition inspected, and perhaps have a block test performed.
My car starts and runs but after getting up near 200 degrees it starts to sputter and stalls. It will not restart until it cools o
ANSWER : You will need to see if you have lost spark to the spark plugs after the engine dies. If it did then you most likely have a bad distributor assembly behind the water pump. Make sure you replace the spark plug wires and spark plugs at the same time. The distributors on your Corvette are prone to heat failure and may even get to the point of not starting at all.
If you need some help, contact a certified technician, such as one from YourMechanic. They will be able to assist you with these checks and properly diagnose your stalling issue.
Car runs better if I unplug fuel injector 8 but makes a ticking noise and runs sluggish if it’s connected 2006 Ford Mustang
ANSWER : Hello – your symptoms suggest a failing injector . It appears to be leaking when it’s plugged in, as well as noisy. Check for problem codes relating to a rich mixture,, although it’s possible that the oxygen sensors for that bank of cylinders is leaning out the other 3 on that side. This would create rough running for sure. That would explain the popping (probably backfiring or misfiring at least on the lean cylinders). I recommend a misfiring inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.
