i have a serious problem with my car (uk 99 turbo, remapped)...
on my way home today and as i joined the motorway and put my foot down and car pulled away as normal then all of a sudden the car stared to hold back and misfire really badly.

managed to drive it home (slowly!) and after doing a few test drives i have found that the boost pressure wont go above 0.8 bar @ around 4000 rpm (normally peaks around 1.25bar.)

as soon as the pressure gets to around 0.7/0.8 it starts violently misfiring and spluttering feels like i am hitting a rev limiter and sounds a bit like anti lag (pop,pop,pop)

driving it slowly or below 0.8bar and its fine.

and here is a worrying extra.... when i opened the cap of the water filler (next to battery) there appears to be oily gunk on the cap and around the neck of the bottle, oil is fine with no sign of water.

please advise

 

forgot to mention, when it starts spluttering its also blowing out some grey/black smoke

Help!

 

tbh it sounds like you've blown a turbo/vacum hose off,mine did that the other week when i blew intercooler hose off lol

 

did have a quick check and all hoses seem to be connected, is it more like like going to be the ones that are close to the turbo?

 

Maye the turbo seals are on the way out mate??? Only way you'll get black/grey smoke out the exhaust.You still on the orig. TD04?

 

As above though i've had a few hoses come loose in the last 4 i've had so possible mate..

 

yes still org td04

 

Sounds like you need to have a good poke around mate..i wouldn't drive it till you have found the prob though

 

if seals were gone, would that cause the gunk in the water filler neck and cap?

 

up until the part about gunk in the overflow it would seem very much like a split/blown pipe. make sure you get your hand under the intercooler and check the pipe there.

 

I might be way off the mark mate....usually when turbo seals go all hell breaks loose and you wouldn't be able to drive the thing.When did you last have the oil changed? Not sure what would cause the oil itself to reach the filler cap!..starvation and splutering?

 

I 've had a hose come loose also and it sound like this. If it's under the I/C you will probably have to take it off to check.

Is the gunk something new. Do you regularly check the water bottle?

I found some gunk in the water bottle a while ago but none has returned.

 

oh well, guess what i am doing tomorrow

 

btw car has a bailey DV and it is still sounds like it purging ok.....thought it might be worth mentioning

 

whip the dump valve off and bung the holes up to rule that out as well. and in reply to your previous question you will want to concentrate mainly from the throttle body, through the intercooler and into the turbocharger. if its a split hose i would put money on it being one of those.

 

re: gunk, just went and took off the pressure cap from the water system and there is nothing in the water or around the cap.

however i did just f*ck the caps seal so i need a new one now

 

**** mate As said mate take off as much as you dare and have a decent nosey around

 

ALL SORTED!!!

as most of you suspected a hose popped off, the big pipe from throttle body to inter cooler, basically the jubilee clip had come off!

so thank god and scoobynet! it was an easy fix