WongRS

iTrader: (11)

does the ISCV work all the time, or only when the engines cold?

my cars developed some stupid idleing habbits since it had a good spirited drive the other day, idles at 1500 rpm cold, 2000 rpm when warmed up, could the ISCV do that?

I thought it may of been TPS (again!) but if i unplug that the idle increases again and goes a bit eratic in general (hunting ETC)

Another thing that may or may not mean something, on overrun, from higher up the rev range, 4k rpmish, if i tapped the throttle gently it would pop and bang with each tap, since i have had this problem, i have noticed it doesn't do that, may be unrelated, but u never know, anyone got any ideas?

Mike Kerbey

iTrader: (1)

If it was after a spirited drive you may have blown off a little vacuum pipe off the inlet manifold causing an air leak

WongRS

iTrader: (11)

thanks for the suggestion, ive had a good poke around and cant hear anything, doesn't seem to be any off, they are all cable tied on too, its not behaving like a vacume pipe either.

Forgot to say, if i unplug the iscv, it makes no difference at all to how the cars behaving.

3dormatt

Got to be an air leak then.

MannheimAlex

Would also say airleak

martysmartie

iTrader: (1)

As said it's an air leak, check the inlet manifold gasket etc.

Martin

WongRS

iTrader: (11)

ok, i'll get the easy start out and see what i can find, thanks for the comments, i'll let u know how i get on!

COLEYST200

iTrader: (3)

Stary of by taking the ISCV out as iv had one fall to bits in the past and it was a very simler problem all so have a look to see if all the bolts are in the plenam as my swedish loves to loos then

Paul_RS

iTrader: (4)

The ISCV could be physically stuck, that way unplugging it makes no difference.

tabetha

I'd check anything that admits air, right down to the inlet manifold gasket, in case worked a tiny bit loose, it's amazing how little air a engine needs when not under load for high rpm, I think dodgy iscv though.
tabetha

WongRS

iTrader: (11)

thanks for all the comment chaps, spot on as usual, had a good poke about and it had obliterated the plenum gasket.
All sorted now and running like a dream!

martysmartie

iTrader: (1)

No problem, glad you found what was wrong.

Martin