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Qaagi - Book of Why

Causes

Effects

A secondary carb not closing all the waycan causevacuum leak type issues

Code PossiblecausesLarge vacuum leak on the engine

PossiblecausesLarge vacuum leak on the engine

a hosecausinga vacuum leak on the engine side

a conduitcausesa vacuum leak within the engine

PCV valve diaphragm rupturedcausingvacuum leak in valve cover

a bad solenoidcausingvacuum leak on the system

Then it gets caught in the check valvecausingvacuum leak symptoms

a " pathcausingvacuum leak symptoms

a defective mass air flow sensor(passive) can be caused byVacuum leak symptoms

Engine Vacuum Signal - Problemscausedengine vacuum leak

PCV valve hosescauseengine vacuum leaks

Vacuum Leak Engine Damage - Problemscausedengine vacuum leak

that PCV ( Crankcase Positive Ventilation ) valve replacement may be a kind of ... oilcausinga vacuum leak for the engine

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

An engine vacuum leak is not an easy thing to identify even though the symptoms are therecausedengine vacuum leak

to control gas admission into high and ultrahigh vacuum systems(passive) are designedvacuum leak valves

An EGR valve that is stuck open ... a conduitcausesa vacuum leak in the engine

a tearcauseda vacuum leak in the engine

evap hosewo ... causean engine vacuum leak

a conduitcausesa vacuum leak in the engine

The booster diaphragm failed while on a tripcausinga vacuum leak in the engine

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

may cause random engine misfiresis causinga vacuum leak in the engine

Over time , it will tearcausinga vacuum leak on the motor

from this valve are a common failure point as they dry out and crackcausingvacuum leaks at idle

an exhaust leak andcausesan intake vacuum leak

their actual repair and really their extra $ 1000 or more for this additional repair was more than likely not at all necessary(passive) could be caused bya vacuum leak somewhere

to conduct a visual inspection to evaluate the seal integrity of packages under a specified vacuum(passive) is precisely designedVacuum Leak Tester

because ... it does idle downcausea direct vacuum leak

the fuel pumpis causinga vacuum leak on the intake

faulty anti - run on valvecausingintermittent vacuum leak

on valvecausingintermittent vacuum leak

Broken plastic line from vacuum pump to brake booster crackedcausingvacuum leak

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

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

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

the vacuum power brake line crackingcausinga vacuum leak

a vacuum hose(passive) be promptedvacuum leak ma

from a vacuum hose(passive) will be promptedvacuum leak

Problems(passive) Caused ByProblems

a rough idle and the idle to decreasewill causea rough idle and the idle to decrease

a lower vacuummay also causea lower vacuum

a rich condition under load or a dirty air filtercausinga rich condition under load or a dirty air filter

it to run leancausesit to run lean

to a sputtering or rough running enginecan leadto a sputtering or rough running engine

rough running , or misfires ... but a large vacuum leak can prevent startingcauserough running , or misfires ... but a large vacuum leak can prevent starting

the air mass sensor to malfunction resulting in poor engine performance ... a small split in any one of the vacuum pipes ( plastic or rubberwill causethe air mass sensor to malfunction resulting in poor engine performance ... a small split in any one of the vacuum pipes ( plastic or rubber

the engine to run leancausingthe engine to run lean

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

usuallycauseusually

a rough idle , or even a stall outcould causea rough idle , or even a stall out

the high idle speedcausingthe high idle speed

a rough idle , misfire , and poor fuel economycan causea rough idle , misfire , and poor fuel economy

these problemsCould ... be causingthese problems

problems(passive) caused byproblems

Problem(passive) can be caused byProblem

addition problems(passive) caused byaddition problems

it to loose vacuumcausesit to loose vacuum

this codecausingthis code

in poor engine performance , bad mileage , and smog check failureresultsin poor engine performance , bad mileage , and smog check failure

most cases(passive) caused bymost cases

check engine lightcausingcheck engine light

idle stumblecausingidle stumble

the check enginecausingthe check engine

High idle(passive) is often caused byHigh idle

a lean conditioncausinga lean condition

the front cylinder to run leancausingthe front cylinder to run lean

fluctuating HC readingsalmost always causefluctuating HC readings

fluctuating HC readingscausefluctuating HC readings

alsocan ... causealso

weak or imprecise transmission shifting pointscan causeweak or imprecise transmission shifting points

a lean fuel / air mixturecan causea lean fuel / air mixture

Code P1131(passive) can be caused byCode P1131

to unmetered airleadingto unmetered air

that kind of rpmcausethat kind of rpm

the high idlecould causethe high idle

to new hissing noiseleadsto new hissing noise

slight idle problemscausingslight idle problems

bpromptedb

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