Oi...Mr Jutel

You're suppose to be coming down here so I can have a go at it.

Oh, sorry about the other day, I forgot to ring you back.

will put a bet on it bing the coil pack

sorry to through something else into the mix but I'd have a good check of the exhaust system. Had a case on a vts i once owned where the performance droppe dright off...it was the cat convertor collapsing...its porus and it basically broke itself down. new cat and it was sorted.

If it passes the zorst test and I suspect it should due to its age then it could be an ECU issue, my bud has a carrado and he had these same issues for a year and spend LOADS trying to fix it, in the end he went to a VW main dealer whome changed the ECU and it was perfect, he then had it mapped again and still no issues a year later.

will put a bet on it bing the coil pack

Nope changed them all 3 months ago for brand new ones.

I will be looking at the pipes from the intercooler, because the seal blew on one today and air was hissing out. Tightened it up and seemed to be marginally better.

Took it out for a run but it is still significantly backing off the boost and really popping and banging on the overun and when decelerating.

Seemed ever so slightly smoother but much sown on power.

Oi...Mr Jutel

You're suppose to be coming down here so I can have a go at it.

Oh, sorry about the other day, I forgot to ring you back.

No probs mate, I'm a pain in the rear you know that

Will be down at the inlaws next week for 2 weeks, so will bring it down for a play m8 and see if we can figure it out.

Guess I shouldn't be worrying about this as the good lady will be giving birth to baby no 2 on Thursday next week..but you know how it is...it's my baby (car) so all is not well and I will fret.

Nick, nice words cheers. It's not going to get the better of me, that I can tell you.

>

My first thought was to wonder about an externally armoured hose collapsing internally, because these things are a burger to spot if you're not looking for them.

Then I read about the "popping and banging on over-run" which makes me wonder if the car's actually over-fuelling.

The most notorious of these hoses for collapsing is the turbo inlet - does yours have the original, or a modified one, Andre?

And another one to maybe think about - OK it was a diesel but I think it might still apply.

Car hadn't the power etc, got it to high revs and then it would fall back again etc etc

Turned out to be a flake of paint from the fuel tank being sucked up to the pump partially blocking it and then as the demand was reduced it would fall back again.

/\ rare, and a burglar to find, but not impossible.

/\ rare, and a burglar to find, but not impossible.

True - I was lucky to have a very good privateer mechanic who'd 1st worked on buses and bus engines for many years (in the days when they had apprenticeships etc).

Could the waste gate be sticking open. I would imagine that would account for crap power at low revs as the turbo would not get enough exhaust gas to spin up fast enough to get boost. [once the engine has got itself up to speed there maybe enough going through the turbo to get sufficient boost at high revs] perhaps...this maybe related to popping on over run as a turbo that is not being 'powered' by the exhaust gases will slow down quicker when the throttle is shut....less boost and air thus richening the mixture.?

just a thought..

EDIT: not sure on a petrol 1.8T wether you have a waste gate on the exhaust side as well as a dumpvalve on the intake side of the turbo........

/\ Well maybe; it would depend on how fast the sensors react to mixture level, but that should be fast enough to "kill" fuelling within one or 2 cycles, maybe 1 revolution of the engine, which is a fraction of a second even at idle speed.