Revs high on idle

[HulmeR87]

Hi folks, got a slight issue, I’ve fitted a straight through exhaust on my vtr with a 3”back box, ever since then when the engines cold it idles at just over 1000rpm, but when I set off driving really slowly around 5-10mph it gets carried away with its self an starts reving just over 2000rpm buy it’s self, once the engine is warm it’s fine ticks over under 1000rpm, any help would be much appreciated cheers

[stevo67]

Vacuum leak somewhere mate.

[HulmeR87]

Cheers mate, a vacuum leak, in that case would the leak be somewhere on the inlet manifold, is there any common places they leak from?

[dturbo]

Mine does this from time to time too. It will go to 2k and idle spot on there, if I let the clutch out a bit it can be brought down and then it will stay at normal idle. blip the throttle again and up it goes to 2k. Only happens whilst the engine is heating up.

I thought vac leak at the inlet manifold, but I have since checked that thoroughly and there's none. Who knows. Doesn't really bother me.

[Alexa]

Maybe this will help

https://www.youtube.com/watch?v=vKAnFQ-S6hk

[MartinObviously]

Remove the ICV and CLEAN it, it's probably dirty too which wont be helping things. the rubber plunger breaks down over time and jams them.

[HulmeR87]

Cheers guys I’ll give the icv a good clean an spray some carp cleaner around the inlet and injectors to see if any seals have perished