Boost Problem
#1
Boost Problem
Hey folks,
Got a problem with my boost, seems I have far too much of it.
Upon accelerating I'm sure I got some kind of fuel cut or over boost. I seen the boost had spiked up to 1.8 bar and 90% on the solenoid (AVCR boost Controller).
Tried again, but a bit gentler on accelerating and boost was going well above the 1.5 bar which it is set at.
So I put the AVCR setting to OFF so that it would boost on wastegate pressure but i was still boosting far too high.
My question is, I suspect the actuator is seized or jammed hence giving me lots of boost, so with the engine off i tried to move it by hand. Should I be able to move the actuator on the turbo by hand? Do i need to put an alternative air pressure supply onto it to test it? or is it jammed/seized as suspected?
Thanks for any info/advice on this
Rich
Got a problem with my boost, seems I have far too much of it.
Upon accelerating I'm sure I got some kind of fuel cut or over boost. I seen the boost had spiked up to 1.8 bar and 90% on the solenoid (AVCR boost Controller).
Tried again, but a bit gentler on accelerating and boost was going well above the 1.5 bar which it is set at.
So I put the AVCR setting to OFF so that it would boost on wastegate pressure but i was still boosting far too high.
My question is, I suspect the actuator is seized or jammed hence giving me lots of boost, so with the engine off i tried to move it by hand. Should I be able to move the actuator on the turbo by hand? Do i need to put an alternative air pressure supply onto it to test it? or is it jammed/seized as suspected?
Thanks for any info/advice on this
Rich
#4
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Take a clean pipe and connet one end to the actuator and one to the compressor housing.
This should then produce 0.5 bar of boost. If it does, there's a problem within the pipework and if it doesn't, theres an issue probably with the actuator.
This should then produce 0.5 bar of boost. If it does, there's a problem within the pipework and if it doesn't, theres an issue probably with the actuator.
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Hi I had the same problem it sounds like turbo creep and it's the waste gate valve on the turbo not shutting fully after boost hence it creeping up over it's normal amount of boost
#7
Found a burst pipe, typical its in an awkward position on the turbo compressor housing.
Glad its an easy fix but if it was the actuator/wastegate then it would have been a good excuse to get it rebuilt.
So my understanding is that the boost from the compressor housing is fed to the boost solenoid then a feed from that goes back to the actuator on the turbo. With no feed to the solenoid then there was no output air pressure from the solenoid to the actuator. With no air signal on the actuator then the wastegate would remain closed and hence producing the maximum boost that the turbo can achieve?
Thanks for all your advice gentlemen
Rich
Glad its an easy fix but if it was the actuator/wastegate then it would have been a good excuse to get it rebuilt.
So my understanding is that the boost from the compressor housing is fed to the boost solenoid then a feed from that goes back to the actuator on the turbo. With no feed to the solenoid then there was no output air pressure from the solenoid to the actuator. With no air signal on the actuator then the wastegate would remain closed and hence producing the maximum boost that the turbo can achieve?
Thanks for all your advice gentlemen
Rich
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#8
So my understanding is that the boost from the compressor housing is fed to the boost solenoid then a feed from that goes back to the actuator on the turbo. With no feed to the solenoid then there was no output air pressure from the solenoid to the actuator. With no air signal on the actuator then the wastegate would remain closed and hence producing the maximum boost that the turbo can achieve?
Thanks for all your advice gentlemen
Rich
Thanks for all your advice gentlemen
Rich
Cheers Iain
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#11
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No because all pipes actuator and everything checked so only thing it will be is the waste gate not shutting properly
#13
Replaced my burst pipe/hose today and the car is running normal again.
I had excess vacuum hose running to the dump valve so robbed about 100 mm length from there. The hose that was split came off the turbo and onto a connector which then fed another hose back to the boost solenoid so only needed a small piece.
Very fiddly job as I ended up romoving the intercooler pipework and filter/maf to get access to the turbo housing connection.
Post no.10 is correct
Cheers
Rich
I had excess vacuum hose running to the dump valve so robbed about 100 mm length from there. The hose that was split came off the turbo and onto a connector which then fed another hose back to the boost solenoid so only needed a small piece.
Very fiddly job as I ended up romoving the intercooler pipework and filter/maf to get access to the turbo housing connection.
Post no.10 is correct
Cheers
Rich
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