Question about Cars & Trucks
Yes this is correct, you can get important information from the colour of smoke from the exhaust:
Blue/Gray Smoke: Blue/gray exhaust smoke is an indication of oil burning in the combustion chamber. These are possible symptoms and causes:
Valve Seals: Leaking valve seals will cause blue/gray smoke at startup because oil leaks past the seals into the cylinder after the engine shuts down.
Valve Guides: Excessive clearance between the valve stem and the valve guide allows oil to leak past the gap into the cylinder.
Piston Rings: Worn or damaged piston rings will cause blow-by resulting in blue/gray smoke.
Worn Cylinder Walls: Worn cylinder walls cause blow-by resulting in blue/gray smoke.
PCV System: A stuck closed PCV valve will cause excessive crankcase pressure resulting in blue/gray smoke.
Black Smoke: Black exhaust smoke is an indication of a rich fuel condition. These are possible causes:
Fuel Injectors: A leaking or dripping fuel injector will cause a rich fuel condition.
Fuel Pressure Regulator: A stuck closed fuel pressure regulator will cause a rich fuel condition.
Fuel Return: A restricted fuel return line will cause a rich fuel condition.
White/Gray Smoke: White exhaust smoke is an indication that coolant is burning in the combustion chamber. These are possible causes:
Cylinder Head: A crack in the cylinder head (around the coolant jacket) will cause coolant to enter the combustion chamber.
Engine Block: A crack in the deck of an engine block near the coolant jacket will cause coolant to enter the combustion chamber.
Head Gasket: A damaged or blown head gasket will cause coolant to enter the combustion chamber resulting in white/gray smoke coming from the tailpipe.
Posted on Jan 17, 2015
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Posted on Jan 02, 2017
SOURCE: 1999 Passat Pulley Problems
It looks like this could be the water pump pulley which has come away, in which case, the housing to which you refer would be the water pump itself.
Very best regards
Posted on Jul 04, 2008
SOURCE: 2005 Chevy Impala exhaust smell
neither one of these would cause gas to leak. sure it is not coolant ? if you think it is gas it is not safe to drive car as it could catch on fire. possible cause would be a leaking injector.
Posted on Jan 27, 2009
SOURCE: Steam out from engine pipes/hose
It looks like from the picture you have a leaking radiator hose/connection. Remove, clean, inspect, replace hose if needed, or tighten connection.
Posted on May 08, 2009
If the smell is like rotten eggs you have a cat converter that has failed. If it is another smell (can't tell because I don't know what kind of antifreeze you have) but you will see while smoke it sounds like you have a blown head gasket. If the gasket blew badly enough, you may be loosing compression on one or two cylinders. which could cause it to run poorly. and having your map sensor unplugged doesn't. help.
Hope this helps.
Posted on Aug 21, 2009
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