If you have a cough - consider this
Discussion
Right, a bottle of injector cleaner and a set of new plugs later... still coughing. Bah. So I poke around the engine bay while she's still running and find a gentle breeze of warm air squirting from the left rear corner. Quick shifty with the torch shows this...
... no, not the fact that some git has left a red rubber band in my engine bay... it's split! It's the bendy flex pipe coming out of the intercooler eventually leading to the front turbo.
From a corresponding scuff on the inside of the clam it looks like it's been rubbing there.
Does anyone have a part number and best source for this please?
Many TIA, Dave
... no, not the fact that some git has left a red rubber band in my engine bay... it's split! It's the bendy flex pipe coming out of the intercooler eventually leading to the front turbo.
From a corresponding scuff on the inside of the clam it looks like it's been rubbing there.
Does anyone have a part number and best source for this please?
Many TIA, Dave
)david.mt said:
Time for the Pro Alloy hard pipe kit and header tank then 
Oh no... bright shiny things, bright shiny things... 
...but that'd make my "original" exhaust look like the rusty end-of-life component it really is and then, and then, and then I'd have some explaining to do... david.mt said:
Anyone who had upgraded to the hard pipes will have a spare - I know I do and you are welcome to it but presume it would be easier to find someone local
Thanks for the offer David; anyone darn sarf got one gathering dust? or am I going to have to talk to Pro Alloy in the morning... 
Blu3R said:
having air sucked in through that hose (isn't good - granted, but) won't affect the running of the car.
True... but my mystery misfire only happens on a trailing (or steady) throttle below 3-4000rpm. Accelerating / higher revs is smooth and (apparently) not lacking power.Is it not the case that the pressure at that bend will be +ve until the turbo spins up (hence the air blowing out at idle)? Could that not affect things elsewhere... when it's not on boost? You mean I can't justify the Pro Alloy kit as a necessary "repair"???
...wanders off to draw plumbing diagrams and scratch head...
Dave2P said:
Right, a bottle of injector cleaner and a set of new plugs later... still coughing. Bah. So I poke around the engine bay while she's still running and find a gentle breeze of warm air squirting from the left rear corner. Quick shifty with the torch shows this...
... no, not the fact that some git has left a red rubber band in my engine bay... it's split! It's the bendy flex pipe coming out of the intercooler eventually leading to the front turbo.
From a corresponding scuff on the inside of the clam it looks like it's been rubbing there.
Does anyone have a part number and best source for this please?
Many TIA, Dave
Hummm, I've just brought the Proalloy hard pipe kit and the garage is replacing those pipes, b... no, not the fact that some git has left a red rubber band in my engine bay... it's split! It's the bendy flex pipe coming out of the intercooler eventually leading to the front turbo.
From a corresponding scuff on the inside of the clam it looks like it's been rubbing there.
Does anyone have a part number and best source for this please?
Many TIA, Dave
ks, got all excited on the Proalloy site and didn't give it a thought, I might have a spare set of flexi pipes going cheap Dave2P said:
Blu3R said:
having air sucked in through that hose (isn't good - granted, but) won't affect the running of the car.
True... but my mystery misfire only happens on a trailing (or steady) throttle below 3-4000rpm. Accelerating / higher revs is smooth and (apparently) not lacking power.Is it not the case that the pressure at that bend will be +ve until the turbo spins up (hence the air blowing out at idle)? Could that not affect things elsewhere... when it's not on boost? You mean I can't justify the Pro Alloy kit as a necessary "repair"???
...wanders off to draw plumbing diagrams and scratch head...
- *Don't actually do this as you could suck any sort of debris into the turbo!! Its just to try to illustrate that the only job of the flexi is to provide a snorkel for the front turbo so the filter can be more suitably placed.
Dave2P said:
Blu3R said:
having air sucked in through that hose (isn't good - granted, but) won't affect the running of the car.
True... but my mystery misfire only happens on a trailing (or steady) throttle below 3-4000rpm. Accelerating / higher revs is smooth and (apparently) not lacking power.Adrian W said:
Has it always done this?
No, just the past couple of weeks. Worst when cold but continues when "warm" - a quick sprint seems to cure it for a while. Just momentary losses of power.FWIW, the plugs I just removed had been in for about 4K - all looked normal and pretty much identical so I don't think it's a particular cylinder/coil.
Adrian W said:
Has the car been remapped?
No.Adrian W said:
Does the misfire coincide with one of the throttle sites?
Not sure what you mean? It seems to occur around 2.5-3K revs.I'll replace the split hose but after that I'm out of ideas so it'll probably be over to Skip to seek out the missing Mojo!
Dave,
Have you had a dodgy lambda sensor recently? Or an air leak in the exhaust, or the pipe under the throttle body blow off? It's likely that the ECU could have learned a bad adaptive owing to a bad lambda reading. That can manifest itself as cough/hiccups at the speeds where it learnt the adaptive. It doesn't adapt at higher throttles and under boost, so those would still be normal.
YellowShed
Have you had a dodgy lambda sensor recently? Or an air leak in the exhaust, or the pipe under the throttle body blow off? It's likely that the ECU could have learned a bad adaptive owing to a bad lambda reading. That can manifest itself as cough/hiccups at the speeds where it learnt the adaptive. It doesn't adapt at higher throttles and under boost, so those would still be normal.
YellowShed
YellowShed said:
Have you had a dodgy lambda sensor recently? Or an air leak in the exhaust, or the pipe under the throttle body blow off?
Not that I'm aware of, although the exhaust is the original and certainly past its best cosmetically so may have sprung a leak somewhere. Are the lambda sensors easy to get at and is there a way to test them - or failing that are they cheap enough to just replace anyway?YellowShed said:
It's likely that the ECU could have learned a bad adaptive owing to a bad lambda reading. That can manifest itself as cough/hiccups at the speeds where it learnt the adaptive. It doesn't adapt at higher throttles and under boost, so those would still be normal.
Thanks - that explanation makes some sense of the symptoms - I was thinking/hoping the split hose may have had that effect... 
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