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Qaagi - Book of Why

Causes

Effects

a defective mass air flow sensor , ignition misfires , a defective idle air control motor , or a stuck - open EGR valve(passive) can be caused byVacuum leak symptoms

the screws of the top of the carburetor worked them self loosecausingvacuum leak 's

shaftscausingvacuum leak enough

Broken plastic line from vacuum pump to brake booster crackedcausingvacuum leak

the hoses that go to and from this valve are a common failure point as they dry out and crackcausingvacuum leaks

Broken plastic line from vacuum pump to brake booster cracked ... .... under warrantycausingvacuum leak

engine components Damaged hosescausingVacuum leaks

engine components Damaged hosescausingVacuum leaks

by a cracked T - Connection near the PCV valve ( typical place for a vacuum leak(passive) caused bya vacuum leak

a very SMALL vacuum hose(passive) is being caused byThe vacuum leak

One of the vacuum lines failedcausinga vacuum leak

by a cracked or split vacuum hose or an intake plenum or manifold gasket leak(passive) caused bya vacuum leak

from a vacuum hose , intake gasket(passive) could be causedvacuum leak

symptoms and things you can use to find vacuum leaks on your carcan causea vacuum leak

a small crack on my valve coveris causinga vacuum leak

the vacuum power brake line crackingcausinga vacuum leak

seal wellcausingvacuum leaks

by cracks in the air box hoses(passive) caused byvacuum leaks

Vacuum leaks , Gasket leakscausevacuum leaks

The brake booster seal can leakcausinga vacuum leak

by cracks and other leaks(passive) caused byvacuum leaks

vacuum linescausevacuum leaks

one cracked hose(passive) could be caused bya vacuum leak

the PCV valve and the faulty hosewas causinga vacuum leak

by a vacuum hose which has become disconnected or has a crack(passive) can be causeda vacuum leak

from a vacuum hose(passive) be promptedvacuum leak

from a vacuum hose(passive) will be promptedvacuum leak

from a vacuum hose(passive) be causedvacuum leak an

from a vacuum hose(passive) be caused vacuum leak an

a vacuum hose(passive) be promptedvacuum leak ma

vacuum hosecausinga vacuum leak

from a vacuum hose(passive) can be causedA vacuum leak

no external , flexible gas lines ... which can easily fatiguecausingvacuum leaks

Damaged hosescausingVacuum leaks

Damaged hosescausingVacuum leaks

Damaged hoses ... And morecausingVacuum leaks

a leak at that hosewould have causeda vacuum leak

A air leakwould causevacuum leak

Broken or cracked hoseswill causevacuum leaks

View Larger Image Vacuum Leak Split hosecausingvacuum leak

too lean a mixture to fire rightis causingtoo lean a mixture to fire right

Problem(passive) can be caused byProblem

idle stumblecausingidle stumble

shifting & braking problems like thatcausingshifting & braking problems like that

bpromptedb

fuel loss problemscan causefuel loss problems

to other engine idle problemsmay leadto other engine idle problems

a lean gas mixture and increased combustion temperatures resulting in premature valve failurecan causea lean gas mixture and increased combustion temperatures resulting in premature valve failure

the engine to idle too highcan causethe engine to idle too high

a variety of engine problemscan causea variety of engine problems

a leak in the vacuum systemcan leada leak in the vacuum system

a lean condition and/or possibly a high idlecan causea lean condition and/or possibly a high idle

idle problemswill causeidle problems

The high idle problem(passive) was caused byThe high idle problem

engine to run lean causingengine to run lean

the engine to run leanshould causethe engine to run lean

to issues on idle and performanceleadsto issues on idle and performance

engine idle problemss causingengine idle problems

it to run lean as wellcan causeit to run lean as well

the car to idle low due to running leancould also causethe car to idle low due to running lean

too lean a mixture even after engine is warmcan causetoo lean a mixture even after engine is warm

the engine to run lean and draw too much air for an idle setting of the throttlecausethe engine to run lean and draw too much air for an idle setting of the throttle

running at low enginewould causerunning at low engine

bad running problemscausebad running problems

high idle or low idlecan causehigh idle or low idle

a high idle , not lowwill causea high idle , not low

a high idle , not a low idlewill causea high idle , not a low idle

too much aircausingtoo much air

a lot of higher than normal idle problemscausea lot of higher than normal idle problems

problemscauseproblems

same problemscan causesame problems

problemscan causeproblems

these problemscan causethese problems

your problemswould ... causeyour problems

A low idle like that(passive) is often caused byA low idle like that

driveability problems by allowing unmetered air to enter the enginecan causedriveability problems by allowing unmetered air to enter the engine

an engine fuel / air mixture to run " lean " and potentially cause higher enginecan causean engine fuel / air mixture to run " lean " and potentially cause higher engine

too much air to enter the manifoldcausingtoo much air to enter the manifold

idle issuescauseidle issues

idle issuescan causeidle issues

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