0
An engine idle that fluctuates can be caused by several factors, including a vacuum leak, which allows extra air into the intake system, disrupting the air-fuel mixture. Issues with the idle air control valve (IAC), which regulates airflow during idle, can also lead to irregular idling. Additionally, problems with fuel delivery, such as a clogged fuel filter or failing fuel pump, or faulty sensors, like the mass airflow sensor or throttle position sensor, can contribute to this issue. Regular maintenance and diagnostics are essential for identifying and resolving the underlying cause.
What else can I help you with?
What causes a Briggs and stratton engine idle speed go up and down?
The most common cause of engine surging (rev up and down) is a dirty air filter.
What causes a Dakota pickup to idle up and down after it warms up and use a lot of gas.?
Hello, Usually The throttle position sensor controls that. When they go bad, your idle will go up and down like that. I hope this is helpful.
How do you get the idle to go down in a 1993 Chevy z28 camaro?
The idle speed is computer controlled on a LT1 engine. If it is a little high, try checking for vacuum leaks.
When AC is on causes the car to go why is this?
Idle compenstorVehicles hve an idle copensator that speeds up the engine when the ac is turned on to ring the rpm back up to the proper idle speed, if yours is too fast then t needs to be adjsted.
What causes the rpms to go up and down at idle?
I would look for a vacuum leak under the hood. If the check engine light is on have an auto parts store read the code(s). The code(s) will help you find the source of the problem.
Why would your idle go down when im at a stop sign your car is a Mazda 2000 protoge?
if the ac was on it could lower the idle down the ac takes about 12 horse power to run + As long as the transmission is in "Drive," it provides excess strain to the engine system and at a stop will keep the engine idle a couple hundred RPM lower than in "Park" or "Neutral."
Why does the idle go up and down when i turn on defroster on a 1989 gmc pick up?
Because it also starts the air conditioning compressor which cycles on and off loading up the engine which changes the idle
What causes Idle to go up and down after engine warms up?
Idle speed fluctuations after an engine warms up can be caused by several factors, including vacuum leaks, which allow unmetered air to enter the engine, disrupting the air-fuel mixture. Additionally, issues with the idle air control valve (IAC), which regulates airflow during idle, or malfunctioning sensors like the mass airflow sensor (MAF) can lead to unstable idle. Fuel delivery problems, such as clogged fuel injectors or a failing fuel pump, may also contribute to these fluctuations. Regular maintenance and diagnostics can help identify and resolve these issues.
Your 93 accord rpm go up and down when car is idle?
your idle air control valve need to replace parts $200 labor $150 or clean it with carburetor spray if you're lucky that might solve the problem i clean my idle air control valve it help little maybe i didn't clean it up good my idle go up and down pretty high and then after i clean it sound much better but it still there idle go up and down slowly now the best way just buy a new idle air control valve engine light turn on hope its not o2sensor
What would cause a 91 LSI and a 97 Metro both to not build engine temp at idle but will after working the engine temp will also go back down if leave idle again after driving car and engine temp up?
Check Coolant Level It Could Be Low. Also Sounds as If Your Thermostat Is Bad.
Your 1990 jeep Cherokee ide will not go down for 5 -10 min after starting what should you ckeck?
locate the idle on your 99 cherokee,then take a flat head screwdriver and turn the idle towards the right to turn the idle down. right now the idle is too high. if you dont know waht the idle looks like it looks like a flat head srew with out the head. located in the front of the engine.
What causes my 87 bronco ii to surge at idle then diewhen i restart it will go to high idle then the idle will slowly reduce down to 800 rpm and idle fine it only does this when it's a cold start?
on the left side of the intake is a round cylinder with wires plugged into it. this is the idle control. It is most likely dirty. take it off and clean it out with carb and choke cleaner.
