Engine wont stay running until warm.
I replaced all the intake gaskets I adjusted the valves and now the car won't stay running until it is up to operating temp do I need to tear it all down and readjust the valves ????
My car has an automatic transmission.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Hi there. Check the fuel filter to see if it’s clogged and not pumping enough fuel. If the fuel filter is good, then the fuel injectors could be leaking causing the intake to flood or the spark plugs could have a crack in the ceramic coating. If you need further assistance with your stalling issue when the engine is cold, then seek out a professional, such as one from Your Mechanic, to help you.
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Well, there is an ignition problem that can cause this when the engine gets hot and it stalls. It`s caused by a lack of spark which can be either the ECU`s fault (on EFI cars), or the coil on pretty much any car. Heat causes expansion. The ECU or the coil gets hot and expands.
Lack Of Fuel
The most common and obvious reason your car may start then die is the fuel shortage in your engine. This happens because there`s not enough fuel in the fuel rail, and there`s no fuel pressure to keep the engine alive.
There are three major causes for a stalled engine: A lack of fuel, a lack of air flow and improper ignition. 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.
If the engine stalls while idling or driving, the engine may be running out of fuel or not receiving enough fuel pressure to keep it running. The most likely cause of this kind of stalling would be a fuel pump that is not spinning fast enough or is intermittently cutting out.
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.
Your vehicle can stop running or have a hard time idling for several reasons. But there are two main reasons: either you have an issue with spark or with fuel. Usually, when your car begins to sputter and then slowly dies, it`s because it has lost fuel pressure. The most common reason is simply running out of gas.
Checking the fuel filter is a good place to start. The fuel pump should also be checked and defective fuel injectors can also impede fuel delivery. These issues are more likely to cause a stall when stationary rather than at speed.
When the idle air control valve fails, it inhibits the flow of air through the engine. When the car can`t receive air, it leads to engine stalling. The severity of this symptom can range from occasional stalling at first, to stalling immediately after ignition.
Common causes of intermittent stalling may include a bad idle speed control (ISC) system, low fuel pressure, loss of ignition, vacuum or EGR leaks, or other problems we`ll get to later in this article.
Your car may not start in cold weather because of problems in a number of areas. battery: cold temperatures affect the chemical process inside the battery and reduce its ability to hold a charge. alternator: alternator belts can become cracked in cold temperatures, making it more difficult to power your battery.
A: If the engine misfire occurs only during a hot restart, checking fuel pressure is the place to start. If the ready fuel supply in the fuel rail on top of the engine is overheated immediately after shutdown, it may percolate or boil the fuel.
A: If the engine misfire occurs only during a hot restart, checking fuel pressure is the place to start. If the ready fuel supply in the fuel rail on top of the engine is overheated immediately after shutdown, it may percolate or boil the fuel.
Car batteries produce less electrical current when it`s cold, due to the chemical reaction being slower than on a warm day. Cold batteries simply don`t produce the same amount of power as warm batteries, and this effect can lead to starting issues.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
car runs great when engine is cold but dies when engine is warm
ANSWER : This sounds like there is a problem with the MAF (mass airflow) sensor. When your vehicle is cold, the PCM (Powertrain Control Module) is in what is known as open loop. Open loop is a preprogrammed program put in place for warm up. Closed loop is when the PCM begins using the sensors to adjust fuel ratio. The primary sensor the PCM uses to make decisions is the MAF. I’m leaning toward three possible problems here. The MAF may have been damaged during cleaning, the connector may have a bent pin from disconnecting and reconnecting its connector or the boot that connects the MAF to the throttle body has developed an air leak.
Before condemning the MAF, make sure there isn’t any unmetered air entering the motor after the MAF. This will confuse the PCM and things just won’t work correctly. Unmetered air is what we call it when there is a leak between the MAF and the throttle body.
Of course, make sure the MAF has been plugged in. If it is, disconnect the connector and inspect the pins. It is fairly common for the small electrical pins in all sensors to get bent over when reconnecting their connector.
It is very easy to damage sensors in the area of the throttle body when cleaning it. Carburetor cleaner can damage sensors. The one I am particularly worried about is the IAC valve. These can stick and cause many different idle control issues.
If this isn’t of any help to you, I recommend having a certified technician, such as one from YourMechanic, diagnose your stalling condition for an accurate repair.
Good luck!
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When engine is cold it studders and misses but when warm it runs juss fine no codes and engine light isnt on why is this happening
ANSWER : When an engine is cold it will need more fuel to run correctly. I would recommend having the fuel injection system cleaned to see if it helps to run better.
If the flush does not work then a scan will be necessary to see if the engine’s air and coolant sensors give the correct reading when cold and as it warms up. If either one is off, replace it. Also cleaning the mass air and throttle body of any dirt and soot would likely help as well.
Contact a certified mechanic if you need assistance with performing these checks. They will be able to diagnose your misfiring issue and make the appropriate repairs to get your car running smoothly again. Good luck.
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The engine of the car runs, but when I push the gas pedal it does not accelerate, and the engine does not rev.
ANSWER : Hello. It sounds like you may have an issue with your throttle position sensor. This sensor sends a reference voltage to your power-train control module, which uses that to determine ignition timing and fuel trims. If the power-train control module is not detecting the proper signal from the throttle position sensor, the engine may not accelerate properly. It’s probably a good idea for you to have a professional mobile mechanic come to your location and complete a car is slow to accelerate inspection first, so they can pinpoint what is causing this issue to occur and they will recommend the right repairs be completed.
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I have a 96 Ford ranger with cel p0340 I have recently done a timing belt, engine runs great replaced cmp sensor cel still on
ANSWER : Hi There,
This may happen for a couple of reasons. First, check to be sure that the connections to the sensor are clean and not faulty or broken. Secondly, check to be sure you replaced the correct sensor as there are two camshaft position sensors in some applications. If you need further help with this, please reach out to us here at YourMechanic as we are always here to help.
This may happen for a couple of reasons. First, check to be sure that the connections to the sensor are clean and not faulty or broken. Secondly, check to be sure you replaced the correct sensor as there are two camshaft position sensors in some applications. If you need further help with this, please reach out to us here at YourMechanic as we are always here to help.
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Honda Pilot engine misfire when cold out and engine running warmer than usual?
ANSWER : Hi There,
It sounds like you may have a faulty coolant temperature sensor. This sensor relays the temperature of the coolant back to the ECM which uses this information to control many things such as when to turn the coolant fans on and off as well as how much to adjust the air to fuel ratio in the motor. Both of these functions are affected when this sensor is not working properly. If the senor is reading incorrectly, this may cause inaccurate temperatures to be read, thus causing inaccurate adjustments to be made to fuel and to the operation of the cooling fans (i.e. staying on too long or not coming on soon enough to help keep the motor cool). I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.
It sounds like you may have a faulty coolant temperature sensor. This sensor relays the temperature of the coolant back to the ECM which uses this information to control many things such as when to turn the coolant fans on and off as well as how much to adjust the air to fuel ratio in the motor. Both of these functions are affected when this sensor is not working properly. If the senor is reading incorrectly, this may cause inaccurate temperatures to be read, thus causing inaccurate adjustments to be made to fuel and to the operation of the cooling fans (i.e. staying on too long or not coming on soon enough to help keep the motor cool). I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.
Read Full Q/A … : Engine wont stay running until warm.
The car engine runs erratically when it is cold, then runs just fine after the car warms up after a while.
ANSWER : Try checking the coolant temperature sensor. When the engine is cold, the enrichment function relies heavily on the coolant temperature sensor to determine how much fuel to supply at lower temperatures. If this is not working properly, it may struggle to settle into a well running pattern. For example, if it is 30 degrees outside and the temperature sensor reads 100 degrees, this may send false information to the ECU causing it to send false information to the fuel injection system. A qualified professional from YourMechanic can inspect the rough running problem and verify the needed repairs.
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Reduce engine power / check engine light is on
ANSWER : Hi there. Most of the time, reduced engine power is caused by a restriction of fuel, or the throttle body’s inability to efficiently mix air and fuel. This could be caused by a failing mass air flow sensor, EGR valve or other fuel system components. Since the check engine light is on, you should have a professional mechanic complete an inspection at your location to determine what codes are stored and which components require repair. This should resolve your issue.
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Can front wheel drive car engine power rear wheel drive
ANSWER : Anything is possible with enough engineering. The changes you are looking at would take major structural changes and would definitely not be an easy job. You could possibly consult a manufacturing engineer to get more details on how this could actually be carried out and whether it would be feasible.
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