sr20 rough idle

[chris]

cleaned afm and spark plugs today the afmr was dirty alright but not the problem.there is a greddy type s bov on the car when i pull off the vacum hose going into it and dont block the hose it runs perfect but if i block the vacum hose or if i connect it back to the bov it starts reving up and down again.is the problem the bov or something else.also when i start the car it runs fine until i give it a rev

[niallsilvia]

cleaned afm and spark plugs today the afmr was dirty alright but not the problem.there is a greddy type s bov on the car when i pull off the vacum hose going into it and dont block the hose it runs perfect but if i block the vacum hose or if i connect it back to the bov it starts reving up and down again.is the problem the bov or something else.also when i start the car it runs fine until i give it a rev

when you've that pipe off and your thumb on it, thats the exact same as when its connected, there would be no air flowing in that pipe during idle when its connected to the bov,

sounds like its running rich and when you give it more air by letting it into that vacuum hose it runs better, could be wrong on this bit???

[chris]

anyone any other suggestions or any more on what niall said.
was driving today and it cuts out when the revs drop say commig into a roundabout or traffic lights etc.its wrecking my head has to be something small cause was running perfect before i parked it up

[m-sykes]

anyone any other suggestions or any more on what niall said.
was driving today and it cuts out when the revs drop say commig into a roundabout or traffic lights etc.its wrecking my head has to be something small cause was running perfect before i parked it up

id say either your afm or lamba sensor, id get different ones and try them out

[chris]

id say either your afm or lamba sensor, id get different ones and try them out

its a brand new lamba sensor so shouldnt be that will see if anyone around has a z32 to try it in mine

[m-sykes]

its a brand new lamba sensor so shouldnt be that will see if anyone around has a z32 to try it in mine

when you rev it to the floor how far does it go up on the rev counter?

[chris]

i havnt rev'ed it that much really.didnt take any notice
besides that the car is driving fine not down in power or anything

[chris]

rocker cover gasket was leaking so changed that today changed the manifold to block,manifold to turbo,turbo to outlet and outlet the turbo gaskets too.changed the oil and filter again threw in one of them engine flush things.new spark plugs and painted the rocker cover.its running perfect now thank god

[20vees]

i have this problem too when driving the car and when you stop it almost cuts out, i have cleaned the the iacv and it still does it, when it warmed up it fluctuates up and down a bit in the revs.
is it the plugs,
afm
02 sensor
fuel pump? as of latley a bit of a whinning when pressing the accellerator.
also i only flushed the iacv with carb cleaner when i took it off i didnt take it apart or anything.
HELP PLEASE

[Johnie]

It might be worth trying the throttle position sensor, I had a few twincams do what your describing and it was the TPS.