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Qaagi - Book of Why

Causes

Effects

an air leakcausinga lean fuel mix

by water(passive) caused bythe lean fuel mix

A vacuum leakcan causea lean fuel mix

the fuel flowcausingthe fuel mixture to go lean

by dirty fuel injectors(passive) can ... be caused byLean fuel mixtures

Fuel pressure regulator failedcausingfuel mixture to run lean

also(passive) can ... be causedLean fuel mixtures

intake leakscausinglean fuel mixtures

ford focus engine diagram vacuum leakcausinglean fuel

by vacuum leak , dirty injections , or EGR valve leaks(passive) caused bylean fuel

Bad fuel injectors oxygen sensors MAF sensor and morecan causea lean air fuel mixture

a vacuum ( air ) leakcausinga lean air / fuel mixture

This is dangerouscan causelean fuel

an amount of fuelresultsin a lean air - fuel mixture

If the EGR valve sticks open , it will act as a large vacuum leakcausinga lean air - fuel mixture

a vacuum leakcausinga lean air / fuel mixture

the operation of the cooling system and conditionscausea lean air / fuel mixture

the cooling system and conditionscausea lean air / fuel mixture

bad dataresultingin a lean air / fuel mixture

oxygenleadsto a lean air - fuel mixture

Idle mixture screws that have settings which are too leanwill causea lean air / fuel mixture

An intake vacuum leakcan causea lean fuel / air mixture

the main jet might be cloggedcausinga lean air / fuel mixture

Ignition timing , andwill causea lean air / fuel mixture

Clogged jets restrict fuel deliverycausinga lean air : fuel mixture

the exhaust gasoriginatingfrom a lean air - fuel mixture

the main jetscausingthe air / fuel mixture to be lean

If stuck openwill causea lean air - fuel mixture

any number of things(passive) can be caused byA lean air / fuel mixture

Low fuel pressuremay causea lean fuel air mixture

vacuum leakcausedlean mixture

The fuel pump sends less fuel to the carburetorcausinga lean fuel - air mixture

EGR opening too sooncauseslean mixture

A vacuum leakwill causean overly lean fuel mixture

Any leakwill causean excessively lean fuel mixture

too much Lean fuel mixture Vacuum leak at the carburetorwill ... causea lean fuel mixture

the mass air sensorcausingtoo lean a fuel mixture

Vacuum leak ... the carburetorwill ... causea lean fuel mixture

Vacuum leak at the carburetorwill ... causea lean fuel mixture

by a vacuum leak or dirty injectors(passive) caused bya lean fuel mixture

a engine to run hotter thencan causea engine to run hotter then

possiblycan ... causepossibly

overheating and detonationcan causeoverheating and detonation

engine damagecausingengine damage

in an increased risk of detonationcan also resultin an increased risk of detonation

to internal damagecan ... leadto internal damage

rough running and poor powerwould causerough running and poor power

an enginecan causean engine

a lean misfirecausinga lean misfire

it to run roughcausingit to run rough

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

in lean misfiresresultsin lean misfires

higher spark plug temperatureswill causehigher spark plug temperatures

alsoresultsalso

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

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

in a misfirewould ... resultin a misfire

piston and head damagecan causepiston and head damage

high /F sensor voltage(passive) could be caused byhigh /F sensor voltage

to overheatingwill also leadto overheating

to overheatingwill also leadto overheating

Car backfires through the carburetor(passive) are sometimes caused byCar backfires through the carburetor

A low heated oxygen sensor ( sensor 1 ) voltage ( 0.4 V or less(passive) could be caused byA low heated oxygen sensor ( sensor 1 ) voltage ( 0.4 V or less

The left Car backfires through the carburetor(passive) are sometimes caused byThe left Car backfires through the carburetor

in an increased risk of detonationcan also resultin an increased risk of detonation

to an increased risk of detonationcan also leadto an increased risk of detonation

in an increased risk of detonationmay also resultin an increased risk of detonation

to an increased risk of detonationmay also leadto an increased risk of detonation

to an increased risk of detonationcan leadto an increased risk of detonation

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

plug tip temperaturecan causeplug tip temperature

a catastrophic engine failurecan causea catastrophic engine failure

excessive heatcan causeexcessive heat

increased turbo lagcan causeincreased turbo lag

in melting of the piston in the center of the exhaust portresultsin melting of the piston in the center of the exhaust port

backfires , poor idling and sluggish acceleration ... and make it hard to start the carcan causebackfires , poor idling and sluggish acceleration ... and make it hard to start the car

in lean misfireresultsin lean misfire

in high engine temperaturewill resultin high engine temperature

an engine to have a surge or miss at idle and partcan causean engine to have a surge or miss at idle and part

engine to run hotcan also causeengine to run hot

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