Hi, I have a 1995, Ford F-150, extended cab, 2wd, 2 tank pickup with the 5.0 efi. When I am driving but step on the brakes to stop the engine dies unless I put it into neutral and step on the throttle. I have replaced the entire ignition system from plugs to ignition control. I've replaced the fuel regulator and filter. She runs like a dream going down the road with no hesitation or lack of power. Just at an idle she dies. At low throttle she backfires. I replaced the egr sensor also. I am at a complete loss. I'm gonna try timing again to see if that is it. Any help would be appreciate
How to Identify and Fix Common car Problems ?
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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 most common reasons a Ford F-150 engine stalling are the fuel system, the air intake system, or the ignition system.
A car dies while idling but restarts later due to misfiring ignition too. If the wires in the wiring harness are corroded or loose, the car will lose voltage because of the unstable connection to the ignition circuit. As a result, the engine won`t have adequate power to stay functioning when the speed slows down.
The most common cause of engine sputtering are issues with the fuel system. These can range from bad fuel filters, fuel pump issues, or fuel injector issues. The other possible source of the problem would be due to poor ignition – think spark plugs or ignition coil problems.
Running out of fuel is one of the most common causes of engine stalling, but dirty fuel injectors or a plugged fuel filter can also be the culprit. Your engine needs air to run properly as well. This air is received through the air intake, which also helps clean the air before it gets to the engine.
Specially tuned for truck customers, Auto Start-Stop shuts off the engine when the vehicle is at a stop – except when towing or in four-wheel-drive mode – to give drivers power on demand when they need it most. When the brake is released, the engine restarts quickly.
If your powertrain control computer is misreading idle speeds, this can cause a high idling malfunction. When your car`s throttle is malfunctioning, this can cause your car to stall or idle high. Often this is a result of dirt buildup in the air intake. Other times it can be a problem with a cracked intake tube.
The main cause of engine stall at high temperature is rapid fuel boiling by increasing fuel temperature. This causes a lot of vapor. Such vapor flows into the fuel pump which leading to decrease the pump load and the current consumption of the fuel pump continuously. This ultimately results in engine stall.
When your engine shuts off when you slow the car down its often as a result of a: Malfunctioning transmission. Low fuel pressure, dirty or defective fuel injectors, or broken fuel pump. Bad oxygen sensor or mass flow sensor.
It might be backfiring or it just sounds and feels like it is not working at normal power. A sputtering engine means that it is not achieving full combustion. It could be the sign of a very simple problem or it could be a symptom of a much more concerning engine, fuel system or exhaust system issue.
A clogged fuel or air filter can make your engine sputter and your acceleration lag because the engine is not getting enough fuel or air, respectively. The combustion chamber needs the correct amount of air and fuel in order to generate combustion efficiently.
With current models the only way to perform an idle shutdown bypass is to engage cruise control, which should be located on the steering wheel. Hold down the button to raise vehicle RPM and release after 5 seconds or so. Right after, hit the gas pedal to keep the truck running in idle.
Your vehicle may be equipped with an engine idle shutdown system. This system automatically shuts down your engine when it has been idling in P (Park) or N (Neutral) for five minutes (parking brake set) or 15 minutes (parking brake not set).
If the vehicle randomly shuts off while driving or stationary, there is usually an issue with the engine. Typical patterns here are issues with the ignition system, mixture preparation or fuel. A known error here is that the vehicle was refueled with the wrong type of fuel.
Worn or Fouled Spark Plugs
Ignition misfire can make your engine stall at idle.
A rough idling engine can be caused by spark plugs or spark plug wires. Spark plugs use the electrical current received from ignition coils to ignite the air/fuel mixture within the combustion chamber. A plug that is damaged or installed incorrectly can result in fuel being burned at an inconsistent rate.
The signal from the coolant temperature sensor tells the engine`s computer when to apply extra gasoline during a cold start. A faulty sensor can confuse the computer, keeping it from providing enough fuel. As a result, the engine may hesitate or stall.
Simply put, a rough idle describes an engine that is not firing consistently when your vehicle is in park, with no gas applied. Most vehicles idle between 600 and 1,200 RPM and should hold their idle speed.
An idle air control valve, also called an idle air sensor control motor, is an electrically operated valve that controls the amount of air that bypasses the throttle plate in cars with a fuel injection system [source: Autozone]. This causes the idling speed of the engine to change as needed.
To check whether the idle air control valve is functioning properly, start the engine and let it run for about 10 to 15 minutes. If the valve is functioning correctly, the engine will sound good and the idle will be steady versus too high, too low, or inconsistent.
A mixture of air and fuel that`s got too much gas in it is called, “rich.” When a rix air/fuel mixture is ignited in the cylinder, the whole mixture won`t be burned up by the time the exhaust valves open. Then, the combustion process will flow to the exhaust where a backfire will take place.
Another possible cause of your backfire is a spark plug refusing to “spark” when the exhaust valve opens. If the air/fuel mixture has become too rich, unburned fuel is left in the exhaust system. The misfired spark plug ignites the rich air/fuel mixture, causing a loud “bang” in the tail pipe.
On the other end of the spectrum, a bad fuel pump, vacuum leak, or clogged fuel injectors could cause an air-fuel ratio that`s too lean; that is, it has too much air and not enough fuel. Though this is the opposite problem, it can also cause a backfire as vapor escapes into the exhaust and combusts there.