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Qaagi - Book of Why

Causes

Effects

May CrackThe PCV vacuum hose under the upper intake plenum ... crackcausingan engine vacuum leak

Engine Vacuum Leak Due to Cracked PCV Vacuum HoseThe PCV vacuum hose under the upper intake plenum ... crackcausingan engine vacuum leak

usually an air leakwill causevacuum leak

Wrapping or covering unused wells of the filtration plateto preventvacuum leak

the brake booster & mastercausingengine vacuum leak

These pieces ... crackcausingengine vacuum leaks

inRegisterChevroletCavalier5 Engine Vacuum Leak Due to Cracked PCV Vacuum Hose on Chevrolet CavalierProblem Description and Possible SolutionThe PCV vacuum hose under the upper intake plenum ... crackcausingan engine vacuum leak

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

Shop OwnersSign inRegisterPontiacSunbird 6 Engine Vacuum Leak Due to Cracked PCV Vacuum Hose on Pontiac SunbirdProblem Description and Possible SolutionThe PCV vacuum hose under the upper intake plenum ... crackcausingan engine vacuum leak

79760 miC $ 886 Brake Booster internal valve malfunctioncausingengine vacuum leak

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

this contributes to a high failure rate ( hose cracking and splittingcausingengine vacuum leaks

the VMV leakingalso causingan engine vacuum leak

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

Over time , it will tearcausinga vacuum leak on the motor

A leaking PCV valvewill causevacuum 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

The common thingsto causevacuum leaks on this engine

intake manifold gasketscreatingvacuum leak

that isolates the engine from the fuel pumpto preventa vacuum leak to the engine

High Flow / Vacuum LeakPossiblecausesLarge vacuum leak on the engine

the intake gasketis causingvacuum leak

where the hose was connectedto preventvacuum leak

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

I thoughtcausesvacuum leak

worn out hosecausingvacuum leak

a deteriorated hose , gasket of seal(passive) possibly caused byan engine vacuum leak

the vacuum lines also breakCausingvacuum leak

any defectsmay causevacuum leak

old gasketis causingvacuum leak

PUMP SEALS AND OIL SWITCHwill createvacuum leak

the vacuum line ... holes or splitswould causevacuum leak

Possible PVC Hosecausingvacuum leak

incorrect carb base gasketcausedvacuum leak

go badcausingvacuum leak

corrodedcausingvacuum leak

US $ 600 Cracked oil strainercausedvacuum leak engine not running correctly

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

bad intake gasketscausingvacuum 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 engine to have a rough idlecausingthe engine to have a rough idle

rough idle and other troublecausesrough idle and other trouble

overly lean conditioncausingoverly lean condition

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

erratic / high idlecausingerratic / high idle

too high High idle(passive) caused bytoo high High idle

high idle and stumblingcausedhigh idle and stumbling

a hard start or even a rough idlecan causea hard start or even a rough idle

all sorts of problemswould causeall sorts of problems

rough idle Integrated PCV valvecausingrough idle Integrated PCV valve

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

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

a lean condition that the ECM can not over come so it can cause a running problemwill causea lean condition that the ECM can not over come so it can cause a running problem

this type of problemcan causethis type of problem

in a high idle , which does n't sound like your issuewould most likely resultin a high idle , which does n't sound like your issue

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

THAT much of a reving problemcausingTHAT much of a reving problem

underhood area Drivability problems(passive) caused byunderhood area Drivability problems

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

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

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

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

High or Fluctuating IdlecausesHigh or Fluctuating Idle

the Check Engine ( SES ) light to illuminate.1 reportcausingthe Check Engine ( SES ) light to illuminate.1 report

a random misfirecan causea random misfire

rich mixturecan causerich mixture

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

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

many problems , such as fooling the airflow meter into thinking less air is being usedcan causemany problems , such as fooling the airflow meter into thinking less air is being used

the " rich fuel " codecausingthe " rich fuel " code

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

both banks ( P0171 and P0174 ) ... that could cause the jerking , if the transmission was the problem it would have transmission fault codes present in most cases but not all(passive) can be caused byboth banks ( P0171 and P0174 ) ... that could cause the jerking , if the transmission was the problem it would have transmission fault codes present in most cases but not all

high output Code P2173(passive) Caused byhigh output Code P2173

the idle fluctuationcausethe idle fluctuation

a miss at idlewill causea miss at idle

irregularity on the idlemay causeirregularity on the idle

crappy idlewould causecrappy idle

a funky idlewould probably causea funky idle

the idle to be erraticcan causethe idle to be erratic

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