Engine hunting on idle

[danielsryan]

for ages my engine was hunting on idle ( bouncing up and down on its own )
so i tried to sort it by cleaning up the throttle body, now my car idles at about 1100 rpm and yesterday i went to pull off and had no throttle at all.
any ideas?
desperately need help.

 

[offitmassive]

let the engine idle,and get under the bonnet and listen for air leaks,like a hissing sound

 

[Asterix34]

Leon S - has had a new MAF sensor and throttle body fitted. No fault codes present. ECU has been refurbished and tested OK. Engine now hunts on starting and gets progressively worse as the car warms up. There are no apparent air leaks and all of the gaskets and seals appear OK.
Anyone have any ideas as to what to do next (be kind!)

 

[dabow]

mine has been doing this sort of thing for ages. but site at about 800rpm, im interested in the out come if sorted. i was thinking of changing the maf my self.

 

[Mo Arif]

if the car is heavily modified, i.e. n249 removal / bypass, catch cans fitted, pcv removed, these engines tend to do this after being modified

Mine does the same and sites around 7-800, hunts every now and then, but nothing shows up on VAG COM, everything has been replaced that meets the eye.

No leaks though! ......

 

[dabow]

all my cupra has, is an air filter & splitter r valve.
i toying on soon seeling this cupra, and getting an r model.
this cupra has cost silly amounts of money, just getting it right.

sorry to hi jack the thread

 

[Asterix34]

Quick update - this vehicle is not modified; now having another look at the ECU