horse sh*t idle

[ratboyvalver]

as above on cold start, idles lovely but when warm idle drops to 400rpm ges lumpy then revs up to 1500rpm then drops to 1000rpm then falls to 400rpm and so on. checked tps for resistance its all ok. checked all earths. any other ideas ?

[schakal]

like this ?

http://www.youtube.com/watch?v=cDkwpG3oSsM

[ratboyvalver]

bang on mate same problemo

[robi1000]

Faulty lambda?

[ratboyvalver]

its got a brand new one :(

[schakal]

bang on mate same problemo

i have suffered this for ages and still cant pin point what it is .

Few things i have figure out all this time :

- Engine will eventually die unless you keep idle high by foot.
when the low idle kicks in when in gear on the road ,seperating the clutch quickly and tapping the gas seems to help avoid jerking /kangooroing .

- It usually happens in/after rainy/humid weather only , when its nice and dry it does not happen on my car . When the engine temp reaches the first line (usually after 5 mins after start up) it goes away . Makes me think something under the bonnet is getting wet/humid and dries off after a while !!!!

- I still suspect the throttle position sensor and i yet to put another throttle body on there .

-I have got a brand new yess fokkn brand new speedo cable and lambda on it and its still does this .so basicly these 2 are pretty much unrelated .

-My 9 with f7r does this but my 19 16v wont

[Smokey McPot]

Mine is doing this too.

[Squeak]

Spray brake cleaner around the inlet manifold ports and the tb if the idle drops or goes higher you havea vacuum leak

[ratboyvalver]

right replaced injector 'o' rings all vacuum hoses still same problem got inlet manifold gasket on order. all whats left after all of this is the brake servo vacuum hose

[Yanoo_]

A friend of mine had the same problem some years ago. He replaced more sensors but it could not help... until he changed the knock / pinking sensor.