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  • Where does the power in an idling engine go? - Motor Vehicle . . .
    The engine therefore idles at a constant speed and if you apply a little throttle it'll idle slightly higher If you start to engage the clutch, you add some more load to the engine as there is now friction between the plates in the clutch, transferring some energy into trying to accelerate the vehicle or overcoming friction in the brakes, etc
  • fuel consumption - Is idling bad for your engine? - Motor Vehicle . . .
    Letting your car idle isn't actively bad for the drive train, but it certainly does put strain on the engine, additionally engaging the AC will put the engine under load, and work the engine harder even though you're not driving anywhere
  • Minimum RPM at idle speed - Motor Vehicle Maintenance Repair Stack . . .
    For a passenger-car engine, idle speed is customarily between 600 rpm and 1,000 rpm For buses and trucks it is approximately 540 rpm In case of many single-cylinder motorcycle engines, idle speed is set between 1200-1500 rp Does anyone know if 540 is the actual minimum rpm or if it could be lower in some vehicles?
  • engine - Accidentally left car idling for 14 hours. What are possible . . .
    During idling, incomplete combustion happens and this is a major factor of oil dilution Moreover, according to the following source, one supplier of blowby flow meters said contrary to what many people think an engine typically has more blowby at idle than at higher rpms As the speed goes up, the rings actually seal better and blowby drops
  • Resolved: Idle RPMs fluctuate and engine hesitation
    If the butterfly is closed too much, the revs will drop too far forcing the engine ECU to open the idle control valve (IAC) It will then try to back off the air through the IAC, but since not enough air is getting passed the butterfly for idle, the revs will drop to far and so the surging cycle repeats
  • How slow ( not zero) can a car engine run without hurting engine and . . .
    The engine needs a minimum rpm to idle smoothly - a v8 can idle smoothly about 500to 600rpm but a 1 litre 3 cylinder needs around 700 to 900rpm It is not the companies that really decided to do the start stop, if you do some research the various governments have implemented legislation over the years that required drivers to turn off the
  • engine - Why does my RPM drop when sitting idle at traffic lights . . .
    I am presuming this is a gasoline engine If so, the symptoms sound very much like the throttle internals are dirty If gunge builds up on the butterfly valve, it can restrict the air required for a smooth idle when the butterfly is closed, so the engine ECU needs to open the Idle Air Valve more that it thinks it should have to and you get into
  • engine - Is starting idle RPM always lower in colder temperatures . . .
    As for the reason behind this, my guess is thicker oil and fluids make it harder to turn the engine As for the waiting before driving the car, I personally run the engine on idle for less than a minute and gently start to drive to save the mechanical parts that are still froze Read what Natural Resources Canada as to say about vehicle warm-up
  • Can one set idle rpm through a commercial OBD diagnostic tool?
    Ultimately it will depend on what vehicle you have All OBD2 vehicles operate within the same parameters, but each automaker uses those parameters differently Best bet, see if there's a 2 way data cable and PC-based software on the market for your vehicle Then see if idle speed adjustment is offered as one of the parameters
  • engine - my car acts like its going to stall at a stop - Motor Vehicle . . .
    The first thing that I would check for is a vacuum leak Vacuum hoses rot over time making this is a common cause of engine speed problems at idle Carefully examine all of the boots and hoses connected to your intake manifold ~~~ to locate an air leak in or around engine, listen for hissing sound when throttle is applied a little





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