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Qaagi - Book of Why

Causes

Effects

usually an air leakwill causevacuum leak

Wrapping or covering unused wells of the filtration plateto preventvacuum leak

when I unplug the vacuum hose the manually block it with my fingerto preventvacuum leak

A leaking PCV valvewill causevacuum leak

leaks in the manifolds or pump suction pipework(passive) caused byVacuum leak

leaking intake manifold gasket - Sprayed Throttle Body cleaner over each intake manifold nut until the idle of the car changed - Checked and re - checked the tightness of each intake manifold nut A little eye candy of my swap(passive) caused byVacuum leak

intake manifold gasketscreatingvacuum leak

the intake gasketis causingvacuum leak

worn out hosecausingvacuum leak

the vacuum lines also breakCausingvacuum leak

I thoughtcausesvacuum leak

a lot of different factors(passive) can be caused bycar vacuum leaks

Possible PVC Hosecausingvacuum leak

old gasketis causingvacuum leak

where the hose was connectedto preventvacuum leak

incorrect carb base gasketcausedvacuum leak

Upon inspection , PCV hose between cylinder banks was badly deterioratedcausingvacuum leak

vacuum assisted brakes(passive) caused byVacuum leak

wrongly adjusted throttle stop(passive) could also be caused byVacuum leak

bad intake gasketscausingvacuum leak

any defectsmay causevacuum leak

a cracked brake hosecausingvacuum leak

go badcausingvacuum leak

corrodedcausingvacuum leak

after you start itto discovervacuum leak

PUMP SEALS AND OIL SWITCHwill createvacuum leak

You might need Teflon tapeto preventvacuum leak

improper CNG installation by that stupid person(passive) caused byvacuum leak

the diaphragmscan causevacuum leak

after a simple tune up and mass air flow sensor replacment and replacing the intake manifold assembly ( burned through from shorted knock sensor harnnesscausingvacuum leak

the vacuum line ... holes or splitswould causevacuum leak

also replaced EGR gasket on advice of store clerkcould causevacuum leak

We removed the egr valve to find no gasketcausingvacuum leak

Description : Non - return valve on some cars may crackcausingvacuum leak

thoroughly - look for carboned - up areacan be creatingvacuum leak

line ... loseto createvacuum leak

a right decisionto preventvacuum leak

with bad EGR valve(passive) can be causedVacuum leak

brake boostercausingvacuum leak

the drying out or cracking of vacuum hoses(passive) can be caused byVacuum leak

rough idle and other troublecausesrough idle and other trouble

your problemcan also causeyour problem

it to run rough and idle highcausingit to run rough and idle high

erratic / high idlecausingerratic / high idle

high idle and stumblingcausedhigh idle and stumbling

the rough idle and misfire on number 1 cylindercausingthe rough idle and misfire on number 1 cylinder

both the high idle hang and the lean codewill causeboth the high idle hang and the lean code

High or Fluctuating IdlecausesHigh or Fluctuating Idle

high idle on 1992 Saturn SL1 sohcWill ... causehigh idle on 1992 Saturn SL1 sohc

a misfires(passive) caused bya misfires

rich mixturecan causerich mixture

a LEAN condition that masked itself as a RICH conditioncreatinga LEAN condition that masked itself as a RICH condition

in Key Science Instrument for InSight Mission to Mars EmailTwitterFacebookLinkedInTumblrPinterestRedditGooglePocketPrintDiscoveredin Key Science Instrument for InSight Mission to Mars EmailTwitterFacebookLinkedInTumblrPinterestRedditGooglePocketPrint

high idle and dieseling cause by high fuel air mix why it will not shut offcausinghigh idle and dieseling cause by high fuel air mix why it will not shut off

the roaming idle / surging idle / sticking idlemaybe causingthe roaming idle / surging idle / sticking idle

in Key Science Instrument for InSight Mission to Mars NASA EyesDiscoveredin Key Science Instrument for InSight Mission to Mars NASA Eyes

a lean condition as long as it is in in open loop fueling ... like when first startingwill causea lean condition as long as it is in in open loop fueling ... like when first starting

an engine to idle up and downwill causean engine to idle up and down

the idle fluctuationcausethe idle fluctuation

irregularity on the idlemay causeirregularity on the idle

a miss at idlewill causea miss at idle

a funky idlewould probably causea funky idle

crappy idlewould causecrappy idle

the idle to be erraticcan causethe idle to be erratic

Cylinder 3misfire(passive) may be caused byCylinder 3misfire

to these engine codeswas contributingto these engine codes

some lean codeswould ... setsome lean codes

lean mixture that may cause misfire at idlecreateslean mixture that may cause misfire at idle

hesitation and misfire which he would have noticed or mentioned all these would also bring on check engine light onwould causehesitation and misfire which he would have noticed or mentioned all these would also bring on check engine light on

all sorts of problemswould causeall sorts of problems

the o2 sensor to malfuction - Fixya Vacuum leak causingcausingthe o2 sensor to malfuction - Fixya Vacuum leak causing

the surging of the enginecausingthe surging of the engine

High steady idle(passive) caused byHigh steady idle

improper fuel trim which can often be confused with MAF readingscausingimproper fuel trim which can often be confused with MAF readings

idle problems , not only look but listen carefully for a leakwill causeidle problems , not only look but listen carefully for a leak

hard start and once warm easy to startcausinghard start and once warm easy to start

the o2 sensor to malfuction Posted by Rodney Rogers on Sep 01 , 2012 Recausingthe o2 sensor to malfuction Posted by Rodney Rogers on Sep 01 , 2012 Re

poor idle but not kill enginecausespoor idle but not kill engine

both gauges to react like thisCan ... causeboth gauges to react like this

the " rich fuel " codecausingthe " rich fuel " code

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