any k jet 16v kr EXPERTS here??

[steveo29 0]

okay i have a KR engined golf, its always reved rather hard on start up and ive never been able to cure it( tried messing with fuel pressure, new isv,isv control,wur etc)

 

anyway today i thought id start it with the isv red black wire undone to see if it keeps the revs down, and on start up the revs shot round to 2-3 k and wouldnt settle ....i plugged the isv in and it dropped back

 

my question is :oops: does that sound like incorrect cold fuel presure? as the idle is 900 when warm without the isv plugged in

[bcstudent 0]

When you say you've messed with the fuel pressure, was that with a gauge or just randomly?

[steveo29 0]

with a gauge

[bcstudent 0]

Hmmm, interesting. Have you tried stripping and cleaning the fuel distribution unit? My 1.8 16v used to idle very high after being thrashed for a while. It turned out that the plunger was gummed up and not returning properly.

 

Do you happen to remember what the control pressure reading was when you tested it?

[steveo29 0]

i cant remeber the pressures it was set to, the system pressure was in spec, and i ajusted the wur with a wideband connected so that when hot its was running good

 

tbh i think the cold fuel pressure is wrong...as it wanted to rev hard with no isv until it warmed up

[flusted 0]

Try disconnecting the black/red wire by the coil,then set the tick over via the screw to about 1000rpm

Im running mine without an isv at the moment

[olly elworthy 0]

doesent sound like a fuel pressure issue,

however set the control pressure to 48psi at idle when warm with a gauge,,

sounds like idle control unit,, although you have tried it,, what are the temp sender connections like on the side of the head also,,

[steveo29 0]

senders are all good

 

i think the isv is working as it should....its holding the revs down when its conected and the engine is cold