mk 4 problems

[bank]

I've got a '98 mk 4 1.8 20v GTI which has developed a number of intermittent faults.

These include:-

- Erratic idle speed.  Usually the idle speed sits around 800rpm but occasionally it races to around 1500rpm.

- Starting problems.  Ususally the car had always started first time no problem.  However, more frequently I find if the car doesn't fire first time it is a complete pig to start taking 5 or 6 attempts.

- Hesitant acceleration, again Intermittent.

Can anybody out there offer any advice?

Cheers

Steve

[kuz]

Try cleaning the throttlebody out around the butterfly normaly gets coked up.

[Alps]

start with the throttle body as reccomended, then after that It may well be two things, water temp sensor (abt £20) from VAG, easy to replace,then theres the MAS (Mass air sensor) this is a common problem but not so cheap!

[topher]

i'd say temp sensor.. fits the symptoms exactly and is a very common fault.

[bank]

Thanks for your replies chaps, changing the water temperature sensor seems to have done the trick.

Cheers

Steve