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Boost issue
- Thread starter 8bit
- Start date
Pyro
Guest
Pyro
Guest
Pyro
Guest
PCV system, all boost and VAX hoses, intercooler hoses, TIP make sure its all tight and no splits ect
The plot thickens. This morning heading to work i was on a 70mph section of road and as soon as I reached 70 the EML (which was still on) started flashing and the car began to slow down, even with foot on the floor, I'm guessing that was limp mode. When I parked up at work I had a quick look under the bonnet and the DV had come out of the TIP. Jubilee clip which used to hold it on was nowhere to be found.
I've gotten a new jubilee at lunchtime and waiting for the snow to stop long enough to refit it.
Could it be if the throttle body was sticking and excess turbo pressure was building up in the charge pipe and intercoolers that the DV would pop out of the TIP?
I've gotten a new jubilee at lunchtime and waiting for the snow to stop long enough to refit it.
Could it be if the throttle body was sticking and excess turbo pressure was building up in the charge pipe and intercoolers that the DV would pop out of the TIP?
DV popping out of charge pipe I can see, but popping out of the TIP....? any pressure coming out of the DV has no restriction going into the TIP so shouldnt be able to provide any force to push it out? you wont even really need a jubilee clip on there for that reason - just the friction of the rubber should be enough to hold it in place, I would think the clips are just put on there for good measure... very strange that this has happened in eyes!
If the TB was sticking then the pressure would likely build up in your charge pipes and if anything was to blow I would expect it be an intercooler hose, or the DV being pushed out of the charge pipe.
Regarding the smell of fuel - as was said, I'd expect the engine would see silly lambda values if being starved of air and would adjust fuelling to suit. Even if it was running very rich, unless you were standing still, I cant imagine the vapours coming back into the cabin from the exhaust?
Check down drivers side wing under bonnet - there is a black box with three hoses coming up out of it - I once had a stink of petrol and no power, one of these hoses had popped off and my car was pissing petrol all over the road! check they are all secure is my 2 pence worth!
If the TB was sticking then the pressure would likely build up in your charge pipes and if anything was to blow I would expect it be an intercooler hose, or the DV being pushed out of the charge pipe.
Regarding the smell of fuel - as was said, I'd expect the engine would see silly lambda values if being starved of air and would adjust fuelling to suit. Even if it was running very rich, unless you were standing still, I cant imagine the vapours coming back into the cabin from the exhaust?
Check down drivers side wing under bonnet - there is a black box with three hoses coming up out of it - I once had a stink of petrol and no power, one of these hoses had popped off and my car was pissing petrol all over the road! check they are all secure is my 2 pence worth!
Pyro
Guest
If I right in saying (correct me if I'm wrong) the only reasson pressure would be coming out of the tip is if your getting turbo flutter?? Where the pressure isn't being recirculated and it goes back the wrong way stalls the turbo ect but now I think about it, it normally happens before DV when DV fails or the vaccine on tge DV
Anyway what I'm getting at is if it's possible the pressure could be being thrown back up tge tip causing pressure in there
Anyway what I'm getting at is if it's possible the pressure could be being thrown back up tge tip causing pressure in there
If I right in saying (correct me if I'm wrong) the only reasson pressure would be coming out of the tip is if your getting turbo flutter?? Where the pressure isn't being recirculated and it goes back the wrong way stalls the turbo ect but now I think about it, it normally happens before DV when DV fails or the vaccine on tge DV
Anyway what I'm getting at is if it's possible the pressure could be being thrown back up tge tip causing pressure in there
Yeah flutter would create a slight increase in pressure in the TIP, but unless you are running the worlds smallest air filter, the pressure will be very low.
Unless the TB is jammed completely shut its unlikely that enough pressure would build up in the charge pipes to actually back pressure through a spooling turbo - and if this was to happen his actual boost would end up way over requested, engine would hit limp mode and N249 would kick in and release the boost before it had chance to ruin the turbo.
Unless the air is being forced in from the air filter it would be difficult to create much positive pressure in the TIP due to the way its shaped.
edit: the comment about actual exceeding requested - is the MAP sensor pre or post TB, as if it is post TB this would not apply (cant see this being the case though for this reason)
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Pyro
Guest
well seeing as the whole engine is effectively computer controlled, your right foot has no direct effect on anything, the engine can limit power in other areas to make limp mode... however N249 valve does play a part in limp mode and if engine encounters problems / overboosting then running it bypassed doesnt do it any favours. The valve is there for a reason and annoying as it is that it sometimes opens the DV and drops your boost temporarily I'd rather have it connected and know the turbo is that bit safer!
well I remember when fitting the DV to the TIP originally it seemed quite a snug fit but it went in very easily today, altho there was some oil residue in there this time.
I did notice that if I pushed in the valve in the bottom of the DV it didn't pop straight back out (vac line was connected but engine was off so shouldn't be any vacuum in that pipe). Not had a look at the TB yet as I'll need someone able to do a reset for me once I've cleaned it out. I guess maybe if it was jammed too far closed and at the same time the DV was stuck open then possibly this might have caused the DV to come out of the TIP?
In any case, next task is to limp home, got the DV back in and a new clip put on but will be taking it easy for now.
I did notice that if I pushed in the valve in the bottom of the DV it didn't pop straight back out (vac line was connected but engine was off so shouldn't be any vacuum in that pipe). Not had a look at the TB yet as I'll need someone able to do a reset for me once I've cleaned it out. I guess maybe if it was jammed too far closed and at the same time the DV was stuck open then possibly this might have caused the DV to come out of the TIP?
In any case, next task is to limp home, got the DV back in and a new clip put on but will be taking it easy for now.
Pyro
Guest
take the DV off puch the piston up hold it there and put your finger over the VAC pipe bit if it drops straight away its fooked it should drop about 3mm then old untill you take our finger off
OK so anyone know what would happen if I was to remove and clean the TB *without* resetting it afterwards? Just hard getting hold of anyone with VAGCOM at the moment, especially given the weather.
Ben, no idea where the MAP sensor is, I'd have thought before the TB but I could be wrong...
Ben, no idea where the MAP sensor is, I'd have thought before the TB but I could be wrong...
Pyro
Guest
Map sencor is if your LC that is
Drivers side under headlight area on the IC pipes you can give the TB a reasonable clean with it still on but if you take it off then when you turn the ignition on just leave it and you'll hear a noise coming from the TB. Its it reseting it's self BUT it don't do it properly the car should run. Ok tho mine did then get it done on vagcom when you can have you checked your DV?
Drivers side under headlight area on the IC pipes
you can give the TB a reasonable clean with it still on but if you take it off then when you turn the ignition on just leave it and you'll hear a noise coming from the TB. Its it reseting it's self BUT it don't do it properly the car should run. Ok tho mine did then get it done on vagcom when you can have you checked your DV?Pyro
Guest
Map sencor is if your LC that is
Drivers side under headlight area on the IC pipes you can give the TB a reasonable clean with it still on but if you take it off then when you turn the ignition on just leave it and you'll hear a noise coming from the TB. Its it reseting it's self BUT it don't do it properly the car should run. Ok tho mine did then get it done on vagcom when you can have you checked your DV?
Drivers side under headlight area on the IC pipes
you can give the TB a reasonable clean with it still on but if you take it off then when you turn the ignition on just leave it and you'll hear a noise coming from the TB. Its it reseting it's self BUT it don't do it properly the car should run. Ok tho mine did then get it done on vagcom when you can have you checked your DV?That's what I thought, cheers, think it's the same on a LCR. Haven't taken the DV off again since I refitted it this afternoon, it's a PITA cos there's not a lot of slack in the hoses and the vac one is a bitch to get off. I only know one guy around this area with VAGCOM and he's not easy to get hold of. Missed out on buying it from someone on here, kicking myself now.
I noticed when checking the DV was still in the TIP tonight that the top of the gearbox is covered in oil. I know there's a leak from the rocker cover gasket, tbh i think i'm just going to take the car to a garage and ask them to sort that plus clean and reset the TB, had enough of this now.
I noticed when checking the DV was still in the TIP tonight that the top of the gearbox is covered in oil. I know there's a leak from the rocker cover gasket, tbh i think i'm just going to take the car to a garage and ask them to sort that plus clean and reset the TB, had enough of this now.
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