I'm at my wits end and can't wait to get rid of the Golf. A nice black Octavia FL vRS petrol with 17,000 miles beckons.

I have started getting the dreaded blinking glow plug light, accompanied by a loss of power and no acceleration. Sometimes I get very jerky/hesitant acceleration but not necessarily the blinking lights/limp mode to go with it. Always, turning the engine off and on again will temporarily clear it...until the next time.

On the occasions the fault has actually been recorded by the ECU, it's saying 'turbo underboost'. Generally it will happen whilst going up a gradual incline on a fast road.

My VW dealer doesn't seem to have the slightest clue how to fix it, despite regularly informing me nothing could be done without a fault code. Now they have one, they're still unable to do much.

I'm assured it is not the MAF sensor, or the vacuum system, despite another dealer telling me the vacuum soleniod is at fault.

My questions are:

1. Would the vacuum pressure test I'm told my dealer has done take into account ALL related hoses...soleniod, turbo or otherwise, and report an air leak?

2. What else can be wrong...the so-called N75 valve?

3. EGR?

4. Air filter?

5. Fuel supply?

6. Aaaaarrrggghhh.....

Any advice, mucho appreciated. Once it's fixed, I can get the Skoda.

your cat could be choked.are you getting vacuum from pipes?

i had 4 golfs & loved em to start off with,& hated em in the end. so much for german engineering eh. paintwork when built was bad /thin. typical rusty arches(you'd think VW would have an answer to it eh,but hey,they make too much money to give a rats ass).

typical injector(pd arrrgh) probs,shaft probs n gearbox because of pump faults etc.

even the mk4's had better engines/turbos than the mk5's. and repair costs/parts,were a joke.mind you peugeot are worse,much worse

Edited 10 February, 201412 yr by crapcable