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Qaagi - Book of Why

Causes

Effects

Guest Do nt flamesresultfrom too much fuel / rich mixture

by too little air or too much fuel getting into the engine(passive) caused byA rich fuel mix

enough air to mix with the gasolinecausinga fuel - rich mixture

by injector problems(passive) caused bya fuel rich mixture

the carbwill causea fuel rich mixture

negative pressureleadingto a fuel rich mixture

The pressure test ... the pumpmay causerich fuel mixtures

the pumpmay causerich fuel mixtures

A restriction in the exhaust systemcan causerich fuel mixtures

the choke(passive) caused bythe petrol rich mixture

that enough fuelto causea rich air / fuel mixture

engine airflowresultingin a rich air fuel mixture

leaky fuel injectorscan causea too rich air fuel mixture

fuel ... turnsto causeover - rich air / fuel mixture

Fuel pressure is too highi.e. ... causinga rich air fuel mixture

something's causinga rich air / fuel mixture

somethingcausinga rich air / fuel mixture

other faultcausingrich air fuel mixture

a clogged air cleaner filter element(passive) caused byan over - rich air / fuel mixture

A dirty air filtercan causea rich fuel - air mixture

by improper(passive) can be caused byA rich fuel / air mixture

a small exhaust leakcausingrich mixture

heavy float ... and imbalancecausingrich mixture

a number of issues such as leaky injectorsor excessive fuel pressure(passive) can be caused byA rich air / fuel mixture

by a large intake leak(passive) caused byan incredibly rich fuel mixture

the " always - open " errorresultingin an overly rich fuel mixture

Blockages in the intake tubecan resultin an overly rich fuel mixture

dumping the excessive air overboard downstream of the mass airflow sensorcausesan excessively rich fuel mixture

dumping the excessive air overboard downstream of the mass airflow sensorwill causean excessively rich fuel mixture

the MAP sensor to fuel the engine ( if fuel injectedcausinga very rich fuel mixture

the high engine vacuumcausesa very rich fuel mixture

a faulty sensorcould be causingan over rich fuel mixture

Too much gas to the enginecausestoo rich a fuel mixture

by the engine computer(passive) caused byRICH FUEL MIXTURE

that are : Faulty O2 sensor(scausingrich fuel mixture

a failure in the air / fuel metering system(passive) is usually caused byRich fuel mixture

An O2 sensor may be outcausinga rich fuel mixture

carburetor problemsresultingin a rich fuel mixture

by the other problems(passive) caused bythe over rich fuel mixture

A restricted fuel filtermay also contributeto a rich fuel mixture

to incomplete combustion and lower exhaust temperatureleadsto incomplete combustion and lower exhaust temperature

to added buildup in the engine and more CO2 and other chemicals in the exhaustleadsto added buildup in the engine and more CO2 and other chemicals in the exhaust

BLACK smokecausingBLACK smoke

Downstream ( petroleum industryresultedDownstream ( petroleum industry

Upstream ( petroleum industryresultedUpstream ( petroleum industry

the clogging(passive) is caused bythe clogging

a high idlewill ... causea high idle

in lower oxygen present in the exhaustresultin lower oxygen present in the exhaust

This situation(passive) is typically caused byThis situation

to carboncontributingto carbon

in lower theoretical exhaust velocitiesresultin lower theoretical exhaust velocities

a low air fuel ratio sensor current , and a lean air fuel mixture causes a high air fuel ratio sensor currentcausesa low air fuel ratio sensor current , and a lean air fuel mixture causes a high air fuel ratio sensor current

A low air fuel ratio sensor voltage(passive) could be caused byA low air fuel ratio sensor voltage

Black exhaust smoke(passive) can be caused byBlack exhaust smoke

Excessive black smoke(passive) is caused byExcessive black smoke

a low a / f sensor currentcausesa low a / f sensor current

a low a / f sensor current , andcausesa low a / f sensor current , and

to an increase in foulingwould leadto an increase in fouling

in very little oxygenwill resultin very little oxygen

A low A / F sensor voltage(passive) could be caused by A low A / F sensor voltage

A low A / F sensor voltage(passive) could be caused byA low A / F sensor voltage

a low /F sensor current , andcausesa low /F sensor current , and

ignitioncausesignition

low /F sensor voltage(passive) could be caused bylow /F sensor voltage

A high heated oxygen sensor ( sensor 1 ) voltage ( 0.5 V or more(passive) could be caused byA high heated oxygen sensor ( sensor 1 ) voltage ( 0.5 V or more

the exhaust gascausingthe exhaust gas

a low amount of oxygen(passive) caused bya low amount of oxygen

Black smoke(passive) is caused byBlack smoke

bad runningwill causebad running

uneven concentrations of fuel in the chambercausesuneven concentrations of fuel in the chamber

sometimesleadssometimes

in decreased fuel efficiency and increased emissionswould resultin decreased fuel efficiency and increased emissions

drivability issues(passive) caused bydrivability issues

sootcausessoot

to cooler tempscontributingto cooler temps

an engine to " load up " at idle , foul the spark plugs , and also lack power or run sluggishcan causean engine to " load up " at idle , foul the spark plugs , and also lack power or run sluggish

an engine to load up at idlecan causean engine to load up at idle

engine deposits(passive) caused byengine deposits

an enginecan causean engine

in high HC emissionsresultingin high HC emissions

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