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Fluctuating idle can be caused by various factors, including vacuum leaks, which allow unmetered air to enter the engine, disrupting the air-fuel mixture. Additionally, issues with the throttle body, such as carbon buildup, can impede airflow. Faulty sensors, such as the Mass Air Flow (MAF) or Throttle Position Sensor (TPS), may send incorrect data to the engine control unit (ECU). Lastly, problems with fuel delivery, like a clogged fuel filter or failing fuel pump, can also contribute to an unstable idle.
What else can I help you with?
What will make a car cut off when you slow down or stop?
Check the idle, if its fluctuating or falling than nomal. Usually, low idle causes stalling when coming into stops. Low idle, usually is due to dirty throttle, a leak in the vac hose, or a damaged MAF or IAC motor.
Why is my 1987 Nissan 4x4 pickup idleing high and fluctuating idle?
Look and listen for a vacumn leak under the hood.
What causes low idle in the engine on a 2002 kia sportage?
low idle and uneven idle
What causes a car to idle good and run rough when you give it gas?
What causes a car to idle good and run rough when you give it gas?
What causes high idle and then rough high idle when heater is turned on?
Vacuum leek
Why is the idle fluctuating on a 1991 Toyota Tercel?
I have found that replacing the PCV valve AND chasing down any exhaust manifold leaks usually does the trick.
What causes the clicking sound and fluctuating rpm in a lancer?
check the servo. it might be wet or loosely connected
What causes a truck to idle high when started?
the choke is on
What causes the idle to fluctuate on a 1992 Lexus ls400?
Fluctuating idle on a 1992 Lexus LS400 can be caused by several factors, including a vacuum leak, which disrupts the air-fuel mixture, or a malfunctioning idle air control valve (IAC), affecting engine idle speed. Additionally, dirty fuel injectors or a clogged air filter can impede airflow and fuel delivery, leading to instability. Faulty sensors, such as the throttle position sensor (TPS) or mass airflow sensor (MAF), may also contribute to erratic idle behavior. Regular maintenance and diagnostic checks can help identify and resolve these issues.
What causes car to vibrate when ac is running but only when in idle?
Fast idle motor is not working. This is allowing the idle to fall below the threshold of what it should be when the A/C is on.
What causes a fast then slow alternating idle when cold?
brendalee
What causes rx8 to idle bad?
Mr. Potato Head
