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Turbo charger over boost was diagnostic term. Also noticed sort of a tapping or clicking off and on at speeds of over 60 mph after having problem with turbo

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  • 7duece Feb 27, 2009

    code P0234 over boosting, N75 has been replaced, wastegate pod is holding vaccuum and rod seems free. Everything I check seems to be in spec. Code always comes back

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Variable vains are sticking in the turbo,you can try moving the lever manually to clean them or using a good quality fuel cleaner,if this fails yiu will need a new turbo

Posted on Jan 30, 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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Have you checked the PCV system?? If its stuck in the closed position then you will lack power and turbo boost. A vehicle needs 3 things to make it run proper; FUEL,FIRE and AIR. Try that and see if it helps.

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I have a 320d of 2000 which has done 104 000k. The turbo boost used to come in at about 2000rpm and again at just over 3000rpm. The 2000 boost does not seem as powerful as it was and the 3000 boost is no...


dear friend:a turbo can only boost the air that it receives,if the turbo is not damaged it should work properly,the turbo depends on the exhaust gasses for the speed that it turns which then boosts the air that it receives,that means that any restrictions on either side of theturbo will influens the preformance,check the air filter and ducting pipes.

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