idle valve controll

r-reg-sr

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Site Supporter
just wondering as the freezer is here what peoples k11 idles at,,,,only on cold start,from morning

at the minute mine goes upto the first white line after 1000 rpm,, and on fully warm it stops their a second before idleing again,

i seen it effects the performance
 

pollyp

Club Member
the IACV operates on afew parameters.

cold fast idle:
whenever the coolant sensor detects the engine's cold, the IACV stays fully open at 80%, injectors enrichen the AFR and the revs should rest at bout 1300rpm.

as the coolant temp rises, the resting state of the IACV begins to progressively close and enrichment returns to normal.

warm idle:
once coolant is at 82C the resting state of the IACV should be almost closed bout 15% and idle is 750rpm.

stabilising period:
whenever the TPS is closed after being opened and revs been increased above idle, the IACV remains 1/2 open (fast idle) for 5sec to stablise the revs bout 1000rpm before closing and returning back to 750rpm idle.

in-gear fast idle:
whenever the ecu detects ur in gear AND the speedo sensor is above 5mph, the IACV remains 1/2 open and free idles (if clutch depressed) at 1000rpm. its a sort of anti-stall feature so that the idle doesn't fall below 750rpm from the additional load of also driving the wheels (ie following very slow congestion)

throttle enrichment:
the IACV opens relative to the amount of load/throttle. when the load is below a certain amount, the IACV returns to "in-gear fast idle" if moving above 5mph or "stabilising period" if stationary
 
OP
OP
r-reg-sr

r-reg-sr

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Site Supporter
perfect
setting it manualy is tricky,, with that info youve given i should be able to now. maybe.

probly wait till its freezing properly before setting it finaly .

you recon ive got the tps messed up as i turned the throttle body bleed screw full clockwise and it rests at7-750'ishk wont go lower with tps disconnected ?
 
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