How does idle speed affect engine idle speed?
Your engines idle is affected NOT by the motion of your vehicle…but from the use of your brake pedal… You can recreate this by running the engine and repeatedly pumping the brakes… This uses engine vacume for the power brakes…and thusly affects the IACV by stealing/altering vacume and affecting idle speed.
What to do when idle RPMs go up?
Take a can of something like carburetor or throttle body cleaner and spray the seam between the throttle body & intake (where the gasket is). If the new gasket is leaking it will suck some in and the idle should surge. Other than that, lots of the tubes and doohickeys on top of the engine are vacuum lines.
What causes the vacuum to drop at idle?
The vacuum is created by the engine sucking in air a lot faster that it is coming in. Thus the “throttle” is literally “throttling.” If you open the throttle the vacuum drops (at least briefly – it depends on what is being done with the throttle) because air rushes in. The only place air should be coming in is past the throttle plate itself.
What’s the idle speed on a Nissan Tiida?
91 NISSAN 300ZXTT FAST IDLE AFTER WARM UP, CHANGED WATER SENSOR STILL PROBLEM WITH IDLE 1500 RPM. CLEANED ACC VALVE, … read more
What causes the idle speed to go up or down?
The idle air control valve is programmed to regulate and maintain the engine idle speed at a constant rate. If the valve fails or has any issues it can cause the idle speed to be thrown off. This may result in an unusually high or low idle speed, or in some cases a surging idle speed that repeatedly climbs and falls. 2. Check Engine Light comes on
Take a can of something like carburetor or throttle body cleaner and spray the seam between the throttle body & intake (where the gasket is). If the new gasket is leaking it will suck some in and the idle should surge. Other than that, lots of the tubes and doohickeys on top of the engine are vacuum lines.
What are the symptoms of a bad idle control valve?
$0.00 1 Irregular idle speed One of the most common symptoms commonly associated with a problematic idle air control valve is irregular idle speed. 2 Check Engine Light comes on Another symptom of a potential issue with the idle control valve is an illuminated Check Engine Light. 3 Engine stalling
Why does the vacuum gauge fluctuate during idle?
Engine idle isn’t a steady thing; it actually fluctuates regularly as the pistons suck in regular gulps of air. This is especially true on large displacement engines with a relatively low cylinder count, like a 500 cubic inch V-8 or a 300 cubic inch six cylinder.