blowing smoke

[98vtir]

hey guys, my mate noticed the other day (he was behind me on moto) that when I dropped it from 4th to 2nd at around 70kmh and hence hitting vtec, it blew a bit of black smoke.

I have seen it before from my car myself when someones been drivin it and I happened to be in a diff car behind it. Just wondering if its a normal thing cause of the diff from 3000rpm or so to 6000 rpm or so. Cheers

Im pretty sure it doesn't blow and smoke when going through gears 1-4 and still hitting vtec

[bennjamin]

its completely normal.

black smoke = excess fuel. Its protection for your engine at high load or RPMs

[98vtir]

thanks very much heaps for clearing that up, i naturally assumed that :D

[mclovin]

black smoke caused by extra fuel being burnt due to ur sudden gear change, all good.

look out for white or blue smoke though, not so good = oil being burnt.

[sPoOnD_]

i had white smoke blowing out..on a non vtec..at high revs..wats dat?

[magicmike]

White smoke could mean your burning coolant ?

Best bet go to a mechanic and get a compression test and leakdown test to check for anything nasty in your cooling system

[mclovin]

i had white smoke blowing out..on a non vtec..at high revs..wats dat?

have u been having to top things up eg. engine oil or coolant. if so that would be an indication of what its burning.

[Limbo]

usually pure white smoke is occurs all the time, its coolant.
White smoke/bluish smoke (its sometimes hard to tell) when hard flooring usually means oil burn

Black smoke usually means its running rich for some reason or rather

[EuroDude]

Have a read of this to determine possible cause:

https://www.environment.nsw.gov.au/esdsmoky/causes.htm


Petrol-engine vehicles

Four-stroke or rotary petrol and LPG engines may emit blue/grey smoke or black smoke. Blue smoke normally means engine wear or damage. Black smoke results from an excessively rich fuel mixture. Where this occurs, the following components may be at fault:
Air cleaner

A rich mixture can be caused by excessive build-up of dirt or oil. Replace the filter element at regular service intervals. Rags or paper caught in the air cleaner intake pipes can also cause black smoke emissions.
Fuel system

Carburettor and engine management system faults leading to black smoke include:

* choke butterfly unable to open fully
* carburettor flooding
* incorrect grade of oil in dashpots
* incorrectly adjusted or faulty automatic choke
* air cleaner winter/summer lever set in wrong position
* manual choke operated incorrectly or when the engine is warm
* worn or loose jets or needles
* sticking diaphragm
* faulty engine management system
* faulty oxygen sensor or other engine management sensors
* faulty fuel injector.

Back to top
Other engine problems

Blue/grey smoke may be emitted from the exhaust pipe or the crankcase breather pipe. It is emitted from the exhaust pipe when oil finds its way into the combustion chamber and is burnt.

This may happen in a number of ways:

* via worn or broken rings, pistons, rotor seals, worn valve guides or faulty valve stem seals
* via the inlet manifold through a faulty brake-booster assembly
* via the inlet manifold through a faulty auto transmission vacuum diaphragm
* via an overfilled oil-bath air cleaner or overfilled carburettor dashpot.

When worn or broken rings or pistons allow gases from the cylinders to pass into the crankcase, 'blow-by' occurs. In older cars this causes blue-grey emissions from the crankcase breather. Modern cars use positive-crankcase ventilation. This prevents emissions of 'blow-by' fumes to the atmosphere by passing them from the crankcase to the induction system, so they are burnt in the combustion chamber.
Positive crankcase ventilation valve

A faulty PCV valve can cause blue smoke emissions from the vehicle's exhaust.

[mclovin]

Have a read of this to determine possible cause:

https://www.environment.nsw.gov.au/esdsmoky/causes.htm


Petrol-engine vehicles

Four-stroke or rotary petrol and LPG engines may emit blue/grey smoke or black smoke. Blue smoke normally means engine wear or damage. Black smoke results from an excessively rich fuel mixture. Where this occurs, the following components may be at fault:
Air cleaner

A rich mixture can be caused by excessive build-up of dirt or oil. Replace the filter element at regular service intervals. Rags or paper caught in the air cleaner intake pipes can also cause black smoke emissions.
Fuel system

Carburettor and engine management system faults leading to black smoke include:

* choke butterfly unable to open fully
* carburettor flooding
* incorrect grade of oil in dashpots
* incorrectly adjusted or faulty automatic choke
* air cleaner winter/summer lever set in wrong position
* manual choke operated incorrectly or when the engine is warm
* worn or loose jets or needles
* sticking diaphragm
* faulty engine management system
* faulty oxygen sensor or other engine management sensors
* faulty fuel injector.

Back to top
Other engine problems

Blue/grey smoke may be emitted from the exhaust pipe or the crankcase breather pipe. It is emitted from the exhaust pipe when oil finds its way into the combustion chamber and is burnt.

This may happen in a number of ways:

* via worn or broken rings, pistons, rotor seals, worn valve guides or faulty valve stem seals
* via the inlet manifold through a faulty brake-booster assembly
* via the inlet manifold through a faulty auto transmission vacuum diaphragm
* via an overfilled oil-bath air cleaner or overfilled carburettor dashpot.

When worn or broken rings or pistons allow gases from the cylinders to pass into the crankcase, 'blow-by' occurs. In older cars this causes blue-grey emissions from the crankcase breather. Modern cars use positive-crankcase ventilation. This prevents emissions of 'blow-by' fumes to the atmosphere by passing them from the crankcase to the induction system, so they are burnt in the combustion chamber.
Positive crankcase ventilation valve

A faulty PCV valve can cause blue smoke emissions from the vehicle's exhaust.


WOW!!!!! 3 YEARS OF TAFE ARE FLOODING BACK INTO MY HEAD.
HANG ON THATS ALL FROM MY TAFE TEXT BOOKS.....