Recently I have been having problems with my 6, its completely standard with a full head rebuild done by myself roughly 3k ago. The car has been running good since, except in the last couple of weeks occasionally when driving the engine will splutter and not allow me to accelerate. This happens for a few minutes every now and then until it seems to clear and carries on fine. The closest thing I can describe it to is its choking, seems very similar to when I have driven my 106 through a puddle thats a little too deep and it coughs for a few minutes after until it clears out.

My main problem is that its too intermittent, so I'm finding it hard to check it over when its at fault, but its starting to get more regular and becoming dangerous for me as last night i was on a slip road, put my foot down and it decided to happen and wouldnt accelerate.

The other thing I have noticed more recently is that it doesn't do it from cold, it's either once I've driven it 20 from work and left it for an hour or so when i'm at my parents before going home, or half way home from work down the dual carriage way.

I have replaced theCTS Map and stepper with new, and I swapped my genuine CAT and Lambda from my other 6 as they were in better condition and my other 6 drove faultless.

Any ideas what it could be? only other problems I can recall at the moment is the speedo is cutting out intermittently (but neither happen at the same time) and sometimes the air bag light will stay on unless I switch the ignition off and back on

Cheers

I'd replace the speedo drive first as it may be causing the problem but I suspect it's prob something like throttle position switch or maybe a bad earth / bad battery terminal ?

Are you running an induction kit ? They have been known to rub up against the loom at the front of the car and cause problems

Having to bring this thread back up after fixing the speedo drive it still had the problem, then I found that oil was leaking down through to the air filter housing which I posted a thread about here http://www.306gti6.com/forum/showthread.php?id=162194. Up until a couple if days ago I thought I had sorted it with no splutter for a while but the last couple if days its been spluttering and struggling near enough every drive. I'm planning on booking it for a few tests next week as I'm stuck for answers as the car has used from max to min marks worth of oil since the 23rd Dec yet its not smoking and there are no visable leaks. Just before I do though has anyone got ideas what I'm looking at here?

Cheers for the reply, I've changed the icv and map sensor, the lambda and throttle position sensor will be replaced soon, but I've decided that the missing is down to the air filter being clogged with oil, as the same head happened again as what's wrong in my other thread linked above. It seems to be coming down the breather pipe into the throttle body again

Update on this Friday I borrowed a compression tester as no where round me seems to have a leakdown tester, starting from belt side I got 150, 166, 205 and 250. With the first 2 being well in the green mark on the tester I used and the other 2 in the "too high red" gauge. It is also cylinders 3 and 4 I am getting a lot of build up on the plugs where the other 2 are clean. This to me sounds like there is oil in those cylinders?

Yesterday I put some forte engine flush through there, renewed with genuine pug filter and total quartz 7000. Whilst doing this I cleaned off all the filter housing and fitted a new element. I also blocked off the part the breather goes into on the throttle body (what is that exactly?) and I put the pipe going into a bottle by the battery box. Hoping to monitor my oil loss and save buying new filters. Took it for about 15 mile drive and a very little among was in the bottle, what I would expect to see normally. I went out this morning and the filter housing has got nice clean oil around it again, btw I slackened the jubilee clip so most would run out rather than puddling in the filter. So I'm baffled now on how the oil is getting into there.