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Qaagi - Book of Why

Causes

Effects

a running engine(passive) created bythe intake manifold vacuum

a wide open throttle under most engine operating conditionsresultingin minimal intake manifold vacuum

You may have engine performance issues ,causinglow manifold vacuum

fine tuning and calibration of Edelbrock Performer carburetors ... especially motors with performance camshaftscauselow intake manifold vacuum

High engine load or power outputcausesintake manifold vacuum to drop

the cam of course(passive) caused bylow manifold vacuum (

The long duration of the camis causinglow manifold vacuum

a hot cam or torn vacuum hose(passive) caused byWeak intake - manifold vacuum

The vacuum cut valvepreventsthe intake manifold vacuum

a restricted exhaust on a MAP systemwill causea drop in intake manifold vacuum

which cylinderscontributelittle to manifold vacuum

advantage ... lean exhaust gasresultsin reduced intake manifold vacuum

Therefore , in response to the increased pressure in the manifold (resultinglower levels of intake manifold vacuum

insufficient canister purgeresultingfrom low intake manifold vacuum

In accordance with the principlecausesa drop in intake manifold vacuum

Excessive hydraulic lifter preloadswill causelow manifold vacuum

Anythingcreateslow manifold vacuum

leaks(passive) caused byintake manifold vacuum

to the chamber of the diaphragm spring side(passive) is ledIntake manifold vacuum

camshaft specs than compression ratio(passive) is ... influenced bylow - speed intake manifold vacuum

a piston moving within a cylindercreatesan intake manifold vacuum

a large camshaft for racing(passive) caused bylow manifold vacuum

exhaust gas recycle when the spark advance due to the first unit decreases(passive) caused byperiods of lower intake manifold vacuum

catwill causelow manifold vacuum

Full thottlecausesvery low manifold vacuum

a problemcauseslow manifold vacuum

when the throttle blade is closedcreatessubstantial intake manifold vacuum

an additional vacuum source ,originatingfrom intake manifold vacuum

fine tuning and calibration of Edelbrock Thunder Series carburetors ... especially motors with performance camshaftscauselow intake manifold vacuum

the big rumpity rump cams that are so often usedwill causelow manifold vacuum

Fuel Pump Gasoline and Diesel Fuel Injection : Operation , Diagnosis , and Service Fuel injectors that inject fuel into the intake port(passive) are influenced byFuel Pump Gasoline and Diesel Fuel Injection : Operation , Diagnosis , and Service Fuel injectors that inject fuel into the intake port

to allow excessive amounts of blow - by gases to backflow through the breather assembly into the air cleaner and through the throttle body to be consumed by normal combustionis designedto allow excessive amounts of blow - by gases to backflow through the breather assembly into the air cleaner and through the throttle body to be consumed by normal combustion

one - way valve 256 in the vacuum side PCV hose 254 to opencausesone - way valve 256 in the vacuum side PCV hose 254 to open

high vacuum under load on the pcv valve sidecreateshigh vacuum under load on the pcv valve side

in the breatherchamber 45 while the internal combustion engine E is runningcreatedin the breatherchamber 45 while the internal combustion engine E is running

the cylinder(passive) caused bythe cylinder

downstream of said throttle valvecreateddownstream of said throttle valve

in the breather chambercreatedin the breather chamber

suctioncreatessuction

one or both outlets , such as(passive) caused byone or both outlets , such as

the circuit in the carbcausesthe circuit in the carb

to fueling errorscan leadto fueling errors

the crankcase gassescausethe crankcase gasses

brake booster assistance(passive) caused bybrake booster assistance

and there is a downward slant of the enginehas ... been createdand there is a downward slant of the engine

this codecan setthis code

the heated air system that helps to warm up your carburetor when it 's coldcreatesthe heated air system that helps to warm up your carburetor when it 's cold

the forces(passive) created bythe forces

to the opening 34 is dependably transmitted to the outlet port 19 through the second filter 35leadsto the opening 34 is dependably transmitted to the outlet port 19 through the second filter 35

the vacuum diaphragm spring to raise the metering rod for an enriched mixturecausesthe vacuum diaphragm spring to raise the metering rod for an enriched mixture

This plateau(passive) is created byThis plateau

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