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Qaagi - Book of Why

Causes

Effects

Too tightwill causelow manifold vacuum and poor idle

The thicker oilcausesa higher vacuum on the intake line

a clogged CAPCould ... causelower engine intake vacuum

the changes in the intake manifold pressureresultfrom engine load ( intake manifold vacuum

also(passive) can ... be causedLow vacuum at the intake pipe

a vacuum leakcausinglow engine vacuum

as tight valves will eventually burncausinga rough idle and low manifold vacuum

a problem within the engine itself ... open or leaky PCV hosecausesintake vacuum to be lower than normal

Fuel and spark management ... msds atomic efi port fuel carbon buildup on the iac pintle or idle air bypass passage vacuum leak or engine mechanical issuecauseslow idle vacuum incorrect

this typewould causelow engine vacuum

a large camshaftcauseslow engine vacuum

This conditioncan causelow engine vacuum

leakscan causelow engine vacuum

internal mechanical problems of this typewould causelow engine vacuum

the solenoid(passive) is ... caused bya pressure or low vacuum condition in the intake manifold ,

the throttle positionresultsin low intake - manifold pressure

by the rv cam I am running(passive) caused bylow engine vacuum

by the rv(passive) caused bylow engine vacuum

Clogged exhaustcausesmanifold vacuum issues

the top of the block(passive) caused bypoor intake manifold fit

an exhaust leak andcausesan intake vacuum leak

by a big cam(passive) caused bylow idle manifold vacuum

one out therewas designedto use manifold vacuum

to open the throttle morewill resultin a lower intake manifold vacuum

the throttle morewill resultin a lower intake manifold vacuum

such a vacuum leakshould ... causea drop in intake vacuum

by the cam(passive) caused bythe lower intake manifold vacuum

closed positioncausinghigh manifold vacuum

The camshould have resultedin lower intake vacuum

the closed or near closed positioncausinghigh manifold vacuum

a problem in the valve train(passive) can often be caused byPoor manifold vacuum

worn intake valvescausinglow manifold vacuum

excessive preloadwill causehigh manifold vacuum

a problemcauseslow manifold vacuum

often(passive) can ... be causedPoor manifold vacuum

This situationresultsin low manifold vacuum

only a few thingswill causelow manifold vacuum

valves not to fully seatcould causelow manifold vacuum

a big camcauseslow idle vacuum

by the cam(passive) caused bylow manifold vacuum

the throttle valve to modulate high transmission control pressurecausesthe throttle valve to modulate high transmission control pressure

erratic operation of the blower bypass valve , poor throttle response , etccauseserratic operation of the blower bypass valve , poor throttle response , etc

a lower vacuummay also causea lower vacuum

the idle issue and lack of poweris causingthe idle issue and lack of power

the throttle valvecausesthe throttle valve

low control pressurecauseslow control pressure

to work with both MLS designsdesignedto work with both MLS designs

lean exhaust conditioncausinglean exhaust condition

A rough or unstable idle(passive) can also be causedA rough or unstable idle

from any number of engine mechanical failures including burned valves , improper valve timing , blown head gaskets , etcresultingfrom any number of engine mechanical failures including burned valves , improper valve timing , blown head gaskets , etc

in a hard brake pedal in a vacuum brake assist systemwill resultin a hard brake pedal in a vacuum brake assist system

in a hard brake pedalwill resultin a hard brake pedal

transmission shift troublescausestransmission shift troubles

High idle(passive) is often caused byHigh idle

a lean conditioncould causea lean condition

in the door in the air flow meterresultingin the door in the air flow meter

alsocan ... causealso

a diaphragm within the FPR to open or closeinfluencesa diaphragm within the FPR to open or close

a cylinder misfire conditionmay causea cylinder misfire condition

the valveshould causethe valve

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

to unmetered airleadingto unmetered air

it to run lean and hotter than normalcausingit to run lean and hotter than normal

that kind of rpmcausethat kind of rpm

from the sudden closure of theresultingfrom the sudden closure of the

from the sudden closure of the throttleresultingfrom the sudden closure of the throttle

The problem(passive) is caused byThe problem

and over fuel at lower normal drivingresultsand over fuel at lower normal driving

a high idleWould ... causea high idle

6can also cause6

the misfire which is common on this engine but is usually more frequentis causingthe misfire which is common on this engine but is usually more frequent

to the ACleadsto the AC

Insufficient volume(passive) can be caused byInsufficient volume

excess fuelcausesexcess fuel

in Stainless Steelsetin Stainless Steel

a signal(passive) caused bya signal

the problem(passive) Could ... be caused bythe problem

the power valve to fully opencausesthe power valve to fully open

the fuel curvecausingthe fuel curve

the fuel curve to be all wrongcausingthe fuel curve to be all wrong

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Smart Reasoning:

C&E

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