Turbo/boost issues

[thePHILosipher]

I need a techi's help please

turbos, for the past month I've been having issues with boost, intercooler pipes blowing off etc, took the car in, fault code was showing a fault with the MAP sensor, so thats been changed, but now a different fault has come up.

When driving it back, down the M1 the best way I could describe it was pulsing, i set a steady cruise at 65 and 5-6 secs you could here and feel the turbo kicking in slightly and then here a little hiss as it comes off boost again, then when i went to accelerate to overtake the car bogs down and wont rev at all and then same fault code shows up, anybody got any clues at all please?

Any help at all would be great, cheers

 

[S7UYJ]

Poss sticking vanes, they are designed to move when the turbo spins up to reduce lag, apparently you can use vag com to motor them free although I've never tried this, or it could be a waste gate issue but would seem unlikely given the pulsing

 

[thePHILosipher]

Poss sticking vanes, they are designed to move when the turbo spins up to reduce lag, apparently you can use vag com to motor them free although I've never tried this, or it could be a waste gate issue but would seem unlikely given the pulsing

so you would thinking the veins might be to blame then?

What about the boost pipes? Collapsing/boost leak somewhere maybe?

 

[S7UYJ]

Well thinking more simply te pulsing could just be the fact that at 65 your probably right on the poit where the turbo kicks in, so even the smallest change in throttle can spin it up given the pulsing sensation, unless its very regular and or happens at other speeds. Bear in mine also that your probably listening to it more than ou used to!
Not a bad call on the pipes though, that would be one explanation for it bogging down, does it big down only under heavy throttle? Think there are only 2 soft hoses but worth checking them all for splits.

 

[thePHILosipher]

Well thinking more simply te pulsing could just be the fact that at 65 your probably right on the poit where the turbo kicks in, so even the smallest change in throttle can spin it up given the pulsing sensation, unless its very regular and or happens at other speeds. Bear in mine also that your probably listening to it more than ou used to!
Not a bad call on the pipes though, that would be one explanation for it bogging down, does it big down only under heavy throttle? Think there are only 2 soft hoses but worth checking them all for splits.

It does it at all speeds, past 48hrs ive been keeping diary notes on the behavior (so yeah I am now looking for it now lol) the thing that is definitely not normal is the fact is that you can hear the engine note change when maintaining speed ànd the hiss when it does it. The eml comes on immediately after pulling away from cold and I mean within 10 seconds, the bog down is heavy especially in third gear ànd above, under little throttle you can still feel the hesitation/bog ànd when you push it a bit harder is when it occurs

Is one of the soft hoses the 90 degree turbo one (the one pictured directly below the strut brace) I ask as that one to me appears faulty as theres more play between the metal couple ànd the actual hose itself

Sent from my LT26i using Tapatalk 2

 

[S7UYJ]

Hmmm ok. That hose pictured can feel lose, but shouldn't cause these issues. Personally I'd take it back to whoever did the MAF sensor and get them to pull the code again, maybe it's been fitted with a faulty new one. Unless you can see any obvious splits in the hoses then it sounds like a sensor.
What's happens is the sensor detects the air going in, and fuels accordingly, if its not working dproperly the engine will be sent fuel sporadically meaning you might not be getting fuel when you ask for it ( heavy throttle) would also explain the eml. It's also viable that its causing the surging as well

 

[mjstokes85]

Dirty egr valve?

 

[vroomtshh]

whats the fault code?

 

[thePHILosipher]

Dirty egr valve?

possibly but it was mapped out so would that still cause a fault?

whats the fault code?

the frequent fault code is P0237 - Turbo/Supercharger boost sensor "a" Low

the other which has popped up a couple of times is P0236 - Turbo/Supercharger performance level low

the faults over the 4 days are as this:

• Deeper tone to the exhaust on idle (more noticable from outside the car) - sounds good but I know its not normal
• Fault code P0237 - Low boost pressure (Every trip this one occurs)
• Fault code P0236 - Low Turbo Performance
• pulsing + hiss when maintaining speed
• Louder than normal 'whistle' when cold - The cars decat so i expect a whilstle of a nature
• White smoke (very occasional) and mainly when going from second to first in town
• Bog down when accelerating
• Low MPG

I think thats covered everything, the more I think about it, the more I think the turbo has died, though strange because before placing the MAP sensor it was presenting the bog down fault very rarely, and drove fine the rest of the time, which maybe leads to the sensor is faulty

 

[thePHILosipher]

Hmmm ok. That hose pictured can feel lose, but shouldn't cause these issues. Personally I'd take it back to whoever did the MAF sensor and get them to pull the code again, maybe it's been fitted with a faulty new one. Unless you can see any obvious splits in the hoses then it sounds like a sensor.
What's happens is the sensor detects the air going in, and fuels accordingly, if its not working dproperly the engine will be sent fuel sporadically meaning you might not be getting fuel when you ask for it ( heavy throttle) would also explain the eml. It's also viable that its causing the surging as well

that makes sense, I had the MAP sensor replaced and thats when these faults became more frequent (coinsidence possibly) I have unplugged the MAF and driven round the village and it was very slightly better but not massively so.

I do expect issues like sensors failing now as it is 100k old and used heavily (25k a year) so I'm not surprised if the sensors are wearing out first really annoying fault I've had in 4 years so its not a bad return

cheers for all the help so far guys!

 

[thePHILosipher]

Fault was:
- Faulty map sensor
- Break in the cable
- Turbo is no longer producing enough boost

Ffs comes to mind

So turbo is delivered fitting on Saturday map sensor is changed ànd loom repaired expensive month with a clutch fly brake discs ànd pads ànd 100k service

tapaspoke from Xperia S

 

[phillpotts92]

What did I tell you Phil!

 

[mjstokes85]

Fault was:
- Faulty map sensor
- Break in the cable
- Turbo is no longer producing enough boost

Ffs comes to mind

So turbo is delivered fitting on Saturday map sensor is changed ànd loom repaired expensive month with a clutch fly brake discs ànd pads ànd 100k service

tapaspoke from Xperia S

Jesus that does sound like an expensive month!

 

[phillpotts92]

Lol he has to do it to ensure he is still in the chance to take the most powerful facelift diesel off me haha

 

[thePHILosipher]

Lol he has to do it to ensure he is still in the chance to take the most powerful facelift diesel off me haha

mate that ship has sailed and as said on facebook the other, i conceed to slowest/most broken RED facelift, thats the key to this RED facelift FR as the big power ones tend to be black zenith grey or yellow

 

[phillpotts92]

What other facelift diesels are out there with big power? Everyone's Is pre fl with fl bumpers on lol