GOLF MK4 GTI -Intriguing Problems- Please help diagnose

[JNS83]

Apologies... I meant to say ICM (Ignition control module). $160, where can I get that from? Used or new?

thanks.

[Ideo]

Id definatly check fuses first.. if the ac doesn't work at idle but fine at speed there's a air flow issue..and vw ac systems won't work if the fans don't turn on.. as for the engine issue.. it could be the tune, coils, the altitude sensor, maf sensor.. u need someone that understands the systems to properly diagnose the issue..not just someone who connects a scan tool, doesn't see any faults and says " no faults, no issues" try taking it to a dealership, they have the correct tooling, knowledge, experience and the ability to speak directly to vw Australia if they require further technical assistance

You're funny.

[brodzta_GTI]

How am I funny?

[JustCruisn]

How am I funny?

Take it to a dealer = ha ha
Many dealers have no clue at all and the apprentices do all the work.

Take it to an experienced VW mechanic.

[brodzta_GTI]

Ummm... I'm one of those apprentices ( starting my 4th yr) we see customers who take their cars to " specialist" shops.. spend thousands if dollars and bring it to us and we diagnose the issue and rectify the complaint a lot quicker.. just my thoughts..

[ntails]

Check fuses as somebody else said. I went through a stinking summer last year with no aircon because i thought i was going to be a a lot of $ to fix. Then i gave the fuse on top of the battery a wiggle and all was fixed. The fuse wasn't actually blown, just a poor connection.

[JNS83]

Hi all,

thank you again for the feedback/advise/recommendations. The problem has been fixed and in the spirit of communication I thought its best to update everybody.

The final problem was indentified as being a trottlebody failure. Once a new trottlebody was put in, the idle went back to normal, the car stopped jerking and the airconditioning started to work perfectly! The car is back to its best now (fingers crossed at least for a while!)

Identifying the problem turned out to be a bloody expensive "trial and error" exercise so I hope this thread helps somebody else in the future.

Thanks again for the feedback/help.