0
at hi rev the piston reciprocates at high speed from tdc(top dead centre) to bdc(bottom dead centre),and there's a cycle in which combustion of charges(fuel and air mixture) takes place,and rate of combustion of fuel can't be increased considerably while high speed functioning,so a little charge is left,which is not fully burnt,it may have un burnt hydrocarbons which looks black,and it is exhausted by the engine,so that's the smoke from your car. and there are other reasons to..like engine's valve mechanism is faulty or problem with the spark plug
Wiki User
∙ 16y ago
Add your answer:
Earn +20 pts
What causes a car to make white smoke from under the hood?
white smoke can be either your car overheating, or smoke from an electrical issue
What causes black smoke in a car?
Black smoke from an engine is caused by unburnt fuel.
What causes white smoke when you start the car in the morning?
condensation
The revs on your car go sky high when you are driving What is wrong with it?
You may be pressing the gas pedal too hard
Your car has high revs even after you have taken your foot off the accelerator what does this mean?
throttle plate stuck? I'm not sure. When I'm driving, I take my foot off the gas and the car jerks and when I have to stop and I push on the brakes the car revs and jerks forward and occasionally stalls
What causes your 2000 grand am gt rev high off and onsometimes it revs at 1500 or 2000 steadybut sometimes returns to normal after restarting the car?
sounds like your t,p,s sensor needs to be cleaned or replaced
Low revs causes car to cut out?
You may need to adjust the throtle or idle of the car. In older cars this is as simple as tightening a cable. So when the car is just idling it will naturally rev higher and not stall.
What causes a car to emit large amount of white smoke?
A blown head gasket
What does a car do when transmission starts to go out?
The engine revs and car doesn't move.
Why is my car overheating and revs up and down?
There are several reasons why your car may be overheating. Check the thermostat to be sure it isn't stuck. If the car revs up and down, the timing may need to be adjusted.
What causes Clunking sound when engine started in car?
If the sound lessens as the engine revs up, it could be the harmonic balancer. The rubber around the pulley could be bad. This is quite easy to see from underneath the car.
Why does a car backfire on a downhill and at high revs?
EXCESS GAS IS BUILDING UP IN THE EXHUAST SYSTEM. ARE YOU USEING LOW GEAR WHEN THIS HAPPENS??? BECAUSE IF YOU ARE THATS WHY.
