isuzu diesel upping boost!

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I've got a mk3 astravan with a isuzu turbo diesel engine,

i've done the white ring mod and i was about to re fit the inlet manifold when i've noticed the idle adjustment screws are fully adjusted to the lowest idle setting,

the engine idles too high as it is before i removed the white ring, is there anything else that could cause the idle to be too high?
 
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i've put it all back together and with the hot idle screw all the way out it still idles too high,

how do i drop the idle down? the cable is adjusted to the max.

come on someone must know
 
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thats unusual mate, pump may be on its way out or you have adjusted the may fuel screw far too much
 
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couldnt be a case of the throttle cable just sticking somewhere, stopping the pedal returning all the way? worth a check
 
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no cause it would not sit on the idle peg if that was the case. Has the fueling been upped at all?
 
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wait a sec, did it get worse when you did the white ring mod? Had you adjusted the hot idle screw before to try and solve it? And when you did the white ring mod, did you replace the plunger in exactly the same way? I mean not rotated at all cause if you did its extremely difficult to find the spot again
 
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before i did the white ring mod the engine was idling too high, i removed the white ring and it was exactly the same,

the hot idle screw was missing and the cold idle screw was all the way out,

the max fuel screw anti tamper cover was untouched and has not been adjusted,

the van isnt over fueling it doesnt smoke any black on acceleration,

could it be someone has timed the pump up incorrectly? maybe?

i fitted a new accelerator cable as the old one was too long and its working correctly
 

jono_astra

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could also be an air leak into the engine.
 
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ive seen this on a merc vito van before, that was burning oil from a leak inside the turbo. the seals had gone on the shaft.
 

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