Sensor Problem?

[RichardBaronGolf]

Hi everyone,

I have a slight problem with my Mk3 golf gti 16v. Whenever I turn the car over no matter if its already warmed up the autochoke will come on is this normal? It does eventually drop down to normal idle.

Also I pulled up to my drive today and noticed the idle seems slightly lumpy not badly but it was moving up and down slightly! I have a blow in my exhaust at the moment its at the flange on the downpipe and I am going to have welded this week could this be causing the lumpy idle?

I did try putting it on my mechanics diagnostic machine but it wouldn't pick it up

[spikenipple]

It's probably the idle stabilisation valve (ISV). Hook it out and soak it in petrol overnight, dry it, spray a little bit of WD40 down the holes and stick it back in and see if it's any better.

[RichardBaronGolf]

okay mate will try that asap and report back

[Screech16v]

Check the wires from the tb that run behind the intake above the exhaust mani as they go crispy and earth out .