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I'm looking to purchase a used car. I've been doing online research and saw this webpage http://www.usedcarsmells.com . They talk about exhaust color and smells. Is it true that you could tell a lot about the engine by looking at what comes out of the exhaust?

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  • Cars & Trucks Master
  • 5,746 Answers

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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6ya6ya

6ya staff

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Posted on Jan 02, 2017

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Richard Raynor

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SOURCE: Engine Control Module Relay

Hi Todd,
I could be dead wrong, but I don't think the ECM has a relay.

What is the problem?

Cheers, D.
93 Golf, 96 Passat TD, 97 Sharan TDI

Posted on Jul 03, 2008

Anonymous

  • 106 Answers

SOURCE: 1999 Passat Pulley Problems

Hi

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

Geordie

Posted on Jul 04, 2008

tripletauto

TripleTauto

  • 1450 Answers

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

autotherapis

Rich Norman

  • 502 Answers

SOURCE: Engine overheats, misses, and smells...

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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Free Service Manuals how to find

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A very good source on car and truck repair would be from chilton manuals. You can purchase them at https://www.chiltondiymanuals.com
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A very good source on car and truck repair would be from chilton manuals. You can purchase them at https://www.chiltondiymanuals.com
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The Chilton and Haynes manuals are your best bet. Order it at your local

Autozone or goto the Library and research them online fro free. You can get

most of this info for free if you have a library card directly from the

Chilton Manuals perhaps the links below will help good luck.

Free Service Manuals how to find

youtube.com

Service manuals are everywhere in the internet and you should even get them

if you search with the correct name. But with a little additional words you

can Add:

clymer repair manual ford
pontiac service manual
clymer repair manual pontiac
free online auto repair manuals
free online auto repair manuals pdf
http://www.autoeducation.com/
http://workshop-manuals.com/
https://www.ifixit.com/
http://www.auto-facts.org/
https://www.alldatadiy.com/index.html
http://www.freeautorepairmanualz.com/
http://www.haynes.com/onlinerepairmanuals/
http://www.citruslibraries.org/
http://www.autotap.com/techlibrary/vehicle_diagnostic_flow_charts_explained.

asp

auto repair & maintenance

BOOT FAILURE TROUBLESHOOTING FLOWCHART
http://www.fonerbooks.com/poster.pdf
http://www.shopjimmy.com/

A very good source on car and truck repair would be from chilton manuals.

You can purchase them at https://www.chiltondiymanuals.com
or even better you can go the the public library or login with you library

card to look at the chilton manuals online. you might also try looking at

these videos:

free chilton manuals online

Live chat at dorman techincal support
1-866-933-2911
https://www.youtube.com/watch?v=Ij9uGuPOAJU


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