Boost issue

[leon cupra r]

you can clean a TB without resetting it mate, even if its working normally.... I did it myself and had no problems. If you are right with your diagnosis, a clean working, but unaligned TB will be a vast improvement over a dirty sticking TB, which undoubtedly will need alignment anyway. Just get it done!

Even if your DV is knackered and is sticking one way or the other, I cant see any situation where enough pressure can build up in your TIP to force it out, unless you block off the end where your filter sits and create huge turbo stall which is obviously never going to happen. Think about it - pressure in there will act in all directions and take the easiest exit - the top of the TIP through your air filter, not pushing your DV out of its spot!

 

[8bit]

you can clean a TB without resetting it mate, even if its working normally.... I did it myself and had no problems. If you are right with your diagnosis, a clean working, but unaligned TB will be a vast improvement over a dirty sticking TB, which undoubtedly will need alignment anyway. Just get it done!

Even if your DV is knackered and is sticking one way or the other, I cant see any situation where enough pressure can build up in your TIP to force it out, unless you block off the end where your filter sits and create huge turbo stall which is obviously never going to happen. Think about it - pressure in there will act in all directions and take the easiest exit - the top of the TIP through your air filter, not pushing your DV out of its spot!

I see your point, I guess the jubilee must have broken and come off, if the DV had popped out of the hose itself then the jubilee would just have fallen down around the hose. Maybe the cold weather caused it to contract too much and it snapped.

I've already taken the car to the garage, it needed an oil leak fixed and I definitely wouldn't have been able to do that myself. Besides that I don't have a driveway (live in a flat) and the street lighting isn't great just now and the weather is too cold for standing outside cleaning throttle bodies etc. The garage I use are good so will see what they say, the guy there has a 1.8T Skoda so he knows these engines well and I trust him.

 

[leon cupra r]

Fair enough mate, hope you get it sorted!

 

[8bit]

Spoke to the garage this afternoon, they've fixed the oil leak (unrelated to this thread) and cleaned and reset the TB. The guy said the car still wouldn't really rev right until it was warmed up a bit so they want to keep it overnight to see what it's like once it's been left to go cold again. They did say they'd scanned and reset the ECU but I forgot to ask what codes came up (EML light was on). I'm betting something to do with boost leak since the DV had come out of the TIP.

I'd have thought if it was a coilpack then they'd have seen a code for misfires on that cylinder? May also be a duff MAF?

 

[leon cupra r]

your DV being out of the TIP will likely throw a MAF readings too low code (as un metered air can be taken in through the old DV hole) so dont be thrown by that and instantly diagnose a faulty MAF....

 

[8bit]

Did notice just before I spotted the DV had come loose that the car started pulling back, reached 70mph then it started falling back to about 50. Is that limp mode? Would it still be in limp mode until the ECU was reset?

 

[leon cupra r]

I think limp mode will usually reset if you turn engine off/on... dont quote me, and I imagine it depends whats caused limp mode / how bad it was / what error codes are stored as a result etc

 

[Pyro]

In my Exsperience limp mode only prevents you boosting higher then about 6.6 psi and won't limit your speed but I could be wrong and it does normally reset after ignition cycle but depends on the factors

 

[leon cupra r]

aye but in your experience front mount intercoolers and catch cans dont fit either sam!!! lol

 

[Pyro]

i never did the catch can my friend so and the FMIC fitted but the had to chop a tinsy bit off the bumper

 

[8bit]

Well, got it back from the garage last night, seemed a lot better and the EML was off. Started it this morning, and as soon as I was moving the EML came back Boost seems a lot better but occasionally it feels like it's holding back. Have to come off and straight back on the throttle to make it build boost right.

Checked the DV and it seems to be sticking open so will try the Forge servicing kit.

 

[Pyro]

What did the garage say mate?

 

[8bit]

They said the fault codes were all related to the stuck throttle body. When I booked it in I did ask for a printout of the codes but they didn't give one. Going to order a cheap, handheld OBD-II code reader and see what's up myself once it arrives.

 

[gezmeister]

Anything more come of this 8bit?

 

[8bit]

Bit hard to say with all the snow and ice, can't really give it any beans. As I said before it was feeling better in that when it did spin up the turbo it seemed to be ok but it wasn't doing it all the time, like it was going in and out of limp mode. I discovered that my DV was sticking open sometimes so I serviced that at the weekend and now it seems to spin up every time but again I can't really give it any stick to see if it's all sorted. I was getting code 17705 - pressure drop between turbo and throttle which I think was cos the DV was sticking open but that's gone now.

At the moment I'm getting codes relating to intake camshaft timing which I think is a sensor fault. Got another thread going on this one so if anyone subscribed to this thread hasn't seen the other one I'd be grateful if anyone can help shed any light on it. Think that's going to have to be a trip to the stealer for some proper diagnostics tho. Other thread is here - http://www.seatcupra.net/forums/showthread.php?t=296004

 

[8bit]

OK spoke too soon. This morning I had a clear, dry stretch of dual-carriageway so managed to floor it through a couple of gears. At least twice when I did this I heard a bit of induction noise but not as much as usual, no turbo spooling up and no surge of acceleration. Almost like the turbo isn't spinning up at all. EDIT - should have said, as before if the above is happening then normally if I come right off the throttle then right back on it then usually it'll spin up properly.

Given I've had the TB cleaned and reset and serviced the dump valve, what else can cause this? Could this be to do with the freezing temperatures? It was -9C this morning and I did notice this happened less often during the warmer spell between the snow early last week.

 

[gezmeister]

Could be related to the cold weather, but i thought it would run better due to the colder, denser air going into the engine?

 

[n11tht]

8bit i had a similar issue on tdi150. put foot down and nothing till 2000 revs then turbo kicked in and it was off like a rocket. i replaced a couple of clips on the intercooler pipes and also cleaned the maf and map sensors and now no hesitation at all.

 

[8bit]

OK, thanks for the suggestions. Did wonder if the cold was potentially leaving ice on the MAF sensor so if I ever find a bit of free time and a clear, dry stretch of road I'll try unplugging it and driving up and down a bit.

@gezmeister, when it does boost, it fairly does shift, or at least spin the wheels up big time Done some more searching last night on the camshaft timing fault codes and someone with a TT traced that to a faulty temp sensor and sender. Going to see if I can get the car to the stealer next week for some proper diagnostics.

 

[Cupr-o-matic]

Oscillating boost!

Hey guys,

Had a flick through some threads and thought this would be the best one to post in... Got an issue with my LCR boost, well more of a niggle and wondered if any of you have come accross it before. Installed a Forge 007 DV with cold side relocation kit a month or so ago and recently when the engine's cold and under 'normal' driving conditions, as the boost reaches 0 PSI, it seems to oscillate between 0 PSI and -5Hg vac. As far as I'm aware all the engine sensors are ok. I've had a 57i for a while with no trouble. Seems to even out once the engine has properly warmed up.

Any ideas would be much appreciated! Thanks.