Question about 2005 Peugeot 405

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Turbo Boost problems. 406 HDI 2000

Turbo Boost problems
I have had a problem with the Turbo not Boosting at the normal 2,250 RPM. sometimes it would boost at anything from 2.500 to 4,000 which wasnt causing much of a problem. When it would boost it would fly. A few weeks ago it started up ok but as i drove off no turbo at all, after a few hundred yards the engine management light came on and has stayed on since. It still runs ok but wont rev over 3,500 and no turbo.....
Anyone with any idea's!!!

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Chech the solenoid that operates the turbo, its located beside the EGR solenoid on the bulkhead, I had one where the vacuum pipe was blocked where it connects to the brake vacuum pipe.

Posted on Aug 04, 2009

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Turbo not boosting opel corsa 1.7dti club bakkie


In the old days the turbo would boost as soon as the engine speed was sufficiently high and any over pressure would be dumped by a relief valve or controlled by a wastegate.



In these modern times of electronics the turbo wastegate is normally open instead of normally closed so there is no automatic boost. The engine management system decides when there will be boost and how much boost there will be.



Turbo chargers are amazingly reliable unless they are abused or there has been foreign matter ingress. When looking for the cause of no boost it is wise to disconnect the intake trunking and turn the compressor vanes by hand to ensure all is well.



Disconnect the vacuum line to the wastegate servo and apply suction to the servo to ensure the servo, the linkage and wastegate is moving and in good order.



The next stage is to examine the vacuum line and connections back to source and then ensure the vacuum supply is adequate.



If all is found to be well with those physical checks the cause of no boost is either the failure of one of the vacuum switches (or the electrical wiring or connections to them) or a fault condition exists that has caused the engine management to decide not to provide turbo boost.



In that case diagnostic equipment will be needed.

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p.s if you do go to hte garage mention the above parts!

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