Was on my way home from work yesterday, had been sat at 70 on cruise for about an hour, then came into some traffic so slowed down. Traffic was doing between 55-70 so dropped into 5th gear. Next time I went to accelerate back up to 70 I noticed that I had lost all boost, the car would accelerate, but not in its usual fashion. There was no black smoke from the back either. I have had a boost pipe pop off in previous years, however this was nothing like that, as I had not accelerated hard for it to suddenly blow it off.

I pulled into the services and the car sounded like the exhaust was blowing (it was very loud). Luckily had my Shark STS unit on me, so plugged it in and read two fault codes. This was definitely one of them http://wiki.ross-tech.com/wiki/index.php/19586/P3130/012592, and the other I can't remember now but think it was something like this http://wiki.ross-tech.com/wiki/index.php/17958/P1550/005456

About 3 weeks ago I did the 'golf tee' method of blocking the EGR, I have had no MIL light illuminate in about 1000 miles since doing this, and neither did the MIL light illuminate when I lost boost - no warning lights at all actually. I thought I might as well put it back to how it was before so plugged the hose back in, and reset the fault codes. Started the car and the loudness that I had heard before had gone, and the car sounded like it normally does. Took it through the services expecting the same thing, but now it was boosting normally. Continued on my journey home, with no more fuss.

Anyone have any clues? It obviously went into limp mode, rather than having blown a hose, however would having the EGR disconnected cause it to go into limp mode? I had been driving the car for 3 weeks with lots of miles before this happened with no problems. Seems strange to me that the MIL light wasn't ever illuminated, and it has not been mapped out.

Cheers,

Si.

Sounds like the map sensor read boost positive or negative deviation which would put it limp mode. Could be sticky turbo vanes, hard to tell The EGR delete thing doesn't throw up limp mode ever in my experience.

If you want me to hook it up to VCDS (and get my two wheels back off you ) I could meet you at the Devon Court hotel (opposite the Shell at Kennford) one evening around 5.30 - 5.45 as I shall be commuting from there to Plymouth on audit this week. Would also be handy as I could run a boost log up Telegraph Hill to see what boost is doing, real compared to specified.

Hmm I'm puzzled at the moment. It happened just outside Taunton, then got back on the road, and gave it hell up Telegraph and it pulled up there like a train, no symptoms since.

Yeh can meet up if you don't mind doing that, let me know what evening suits you best. At the moment I have a few days off but could be called in at any time. I'll load up the wheels too

Sounds like the map sensor read boost positive or negative deviation which would put it limp mode. Could be sticky turbo vanes, hard to tell The EGR delete thing doesn't throw up limp mode ever in my experience.

If you want me to hook it up to VCDS (and get my two wheels back off you ) I could meet you at the Devon Court hotel (opposite the Shell at Kennford) one evening around 5.30 - 5.45 as I shall be commuting from there to Plymouth on audit this week. Would also be handy as I could run a boost log up Telegraph Hill to see what boost is doing, real compared to specified.

by sticky vanes do you mean the internals of the turbo? or the pipes connectiing to it?

simon, seems like alot of people have had this lately

sticky vanes inside the turbo, essentially keeping the vanes either open or closed when they should be moving open/closed as needed by the turbo at certain revs/conditions.

Simon - I can do any day this week except Wednesday. I'll be leaving Plym in rush hour at 5pm ish each day (unless work gets crappy and might have the odd later finish...) and its about 45 minutes back to Devon Court hotel from there.

Not being a mechanic, for many years now, before turbo, but still and engineer

I think the sticking vanes theory is about right

You were running on cruise control at a constant speed, for an hour, and realisticaly the turbo would not have been at this constant position before, so, became stuck in that posn,oil/muck

Once stopped they settled back, and back to normal use opening and closing, as your driving varies, constantly, so now it is OK

Just my 2p and certainly not authoritive

Out of interest, I stuck mine on auto cruise control on my normal run to work constant 60, using a good but curvy B road, bloody ell, scary, I never realised how travelling at what you thought was

as constant 60 manually," you must automatically slow down at the bends unconciously :-)"

National

Most of my mileage is done sat at 70 on cruise going to work, and that is a 140 mile trip each way. The car certainly gets a good boot full every time I am out in it though. Will keep an eye on it anyway, and see if it happens again - hope not!

Jason I will send you a PM regarding meeting up

had this when the map first went on, i changed some boost pipes and it never happened again,

had this when the map first went on, i changed some boost pipes and it never happened again,

:wonder: hmmm......

Even more things our cars share in common Trevor

I'll just see if it does it again, can't afford for anything else at the moment what with a full service and the 256mm brakes going on in two weeks.

Mine done this too

Just to add to our stuff in common

Mine was scanned, and as per Jasons first reply, MAP sensor.

Turned out on mine, the wiring was just a little too tight on the MAP sensor with the fmic fitted, so i unclipped a few of the cable tidys, to give it a bit of slack.

Been fine since.

Edited 17 May, 201115 yr by LittleJohnny

Mine did this the other day same faults. Is there a way to loosen the veins up or clean them without removing turbo or is there a way to test the vacuum box?

Do search for Mr Muslce on here. It is how it sounds. Mr Muscle into the exhaust side of the turbo to clean all the carbon and crap off.

Phil

How much should i be able to move the vein linkage by? Had a look and mine moves a little but is stiff

if you aint getting limp mode, just leave it. It isnt easy to push so dont worry

Blimey this was a while ago! To update what was actually wrong with mine, was out on track at Combe when the turbo finally made some horrid noises. Turned out to be the vanes themselves that had been chewed up by debris entering inlet pipe to the turbo. A mixture of a broken air box and green cotton filter were to blame, and thus cost me my second turbo

no amount of mr muscle can fix that

Wish it did! £1.50 bottle instead of £800 odd for some metal snail thing

i bet

Mine is in limp mode, had new turbo recently so didnt think iy was veins as all the inlet system was cleaned out. Ive looked and all pipes seemed to be attached cant feel any leaks but the fault code said something about egr and waste gate.

Does it go into limp mode when you push it? Or is it always in limp? Is it still limping when engine is restarted?

Always in limp and sounds like a tractor. And exhaust light is on.

Always in limp and sounds like a tractor. And exhaust light is on.

They sounds awful when they don't have boost! I had a pipe come off and it sounded very very rough and clattery with no boost.

Shame the turbos gone. So what happened to the airbox? Wsa it damaged at any time?

Phil

Richard-vrs

might be worth starting a new topic mate, and explaining fully, your a bit lost in this thread, youll be more visible and someone is more likely to be able to help.

Edited 22 August, 201213 yr by Lofty79

long shot- sure it's not heat soak?, for want of a better word ---I know it's a diesel, but had similar thing twice on mine when almost new- only on motorway in similar circumstances---how much fuel was in the tank?