sick of my rough idle

[Blue MK2]

u after this one ?

[Blue MK2]

ignore the red circle. I havn't read the post fully but i think your after the blue sensor near the radiator pipe?

[Veedubgt18v]

thats the one cheers mate!  

[forzanerazzurri]

how can u tell if your fuel injection is cis or not? i have an isv etc.

[forzanerazzurri]

WOW ,alright i have somethign indredibly interesting,i was playing aorund treying that method and as i was playing around i yanked on a bunching of wires.  on my 8v there is  a bunch of wires covered in a plastic cord, just to the left of the brake fluid resivoir. whenever i pull or twist that bunch of wires my engine starts to stall but then the isv kicks in and recovers.  i have no idea what this means can anyone help?  

[forzanerazzurri]

does anyone have MSN messener or somethign so i can send a photo of the area or talk further?

[Miacant]

it has to be an ISV problem as this is what keeps the revs at a constant 1k rpm.

when the car is cold the ISV will open the throttle that little bit extra to keep the revs that bit higher

when driving the car and coming of the throttle, say changing up and down gear do the revs plummet or do they drop slowly

if they plummet the ISV aint working, they should drop slowly

also, check and feel if the ISV is gently vibrating when the engine is running.

or easier would be to disconnect the ISV, start the engine - then feel the ISV

stop the engine, reconnect it, then restart and feel the ISV - you should feel a difference


my dodgy idle was simply a dirty terminal/switch on the ISV temp sender

When I start the car from cold revs starts at 1k rpm then within few secs slowly moves upwards to says 1500 rpm. It sits there for about a 1.5mins then gradually moves down just below 1k rpm. I read this as a signal to take off without a bouncy revs when I come to change down gears or stopping in traffic.

Again when I start the car from cold I avoid putting my foot on
the throttle as revs bounces between 1000-1500 rpm and only settle just below 1k rpm when warm.

[ANSA]

mate have you got the idle probllem sorted and if so what did you do as I have the same problem with mine just that sometimes when im driving and change gears the idle sometimes stays at 1500 rpm!!

[turbo]

i have had to crimp theses wire about 5 times! they keep snapping theses wire go to the throttle senders one is fuel cutoff at full throttle and other is idle sender knows when throttle is shut!

[Veedubgt18v]

The other thing to check is the pleated air pipe from the box to the throttle body, in the pleats splits can develop, which are easy to miss cos they are hidden, listen carefully for sucking noises!