m3 golf gti 16v still cutting out

[dannysgti]

can any one help my golf gti 16v wont idle ,it will start up if ive got my foot on the accelerator but just wont tick over ive checked all the hoses and cleaned the throttle body out but no joy ,any ideas please

[raylee25]

Replace the ISV

[Mark_H]

Hi,

Have you been able to get any DTC's from the car. I've just fixed an idle problem with my MK3 16v....Tried loads of stuff but it ended up being the vacuum pipe from the inlet manifold to the ECU. There was nothing wrong with the pipe from the outside but for some reason it was not functioning correctly and causing a MAP DTC to be triggered.

My car would sometimes idle and sometimes not. !!!!! it hunted from 700 - 1100 until the engine got hot....and If I did not rev it during the hunting it would stall


There's a post on club gti which gives some details and good tips to help you.....

Here's me post for reference.

http://www.clubgti.co.uk/forum/showthread.php?t=114746





hopefully it helps....


Mark

[EvilScotsman]

When you say you cleaned the TB did you take it off and do it?

You have to remove it and SCRUB every trace of black from the bore on both sides of the butterfly AND the edge of the butterfly disc!!!

The idle air gap when the throttle is shut is microscopically tiny and cleaning one side or "cleaning it a bit" is pointless and doesnt work. It has to look like new THEN it will idle...if thats the prob. Mine did exactly the same and only had a small amount of crud but I had to do it twice (properly the second time lol) then it worked like a charm. The gap needed is about the thickness of a sheet of paper and will block easily.

To find a vacuum leak you need a vacuum tester but if it won't idle then its going to be hard to test. To make it idle so you can drive it just now, pull the throttle cable back out of the mount on the TB and move the circlip closer to the end one ridge at a time till it will idle, then investigate the other stuff one by one!