Tried to post this earlier, had a few issues with my computer, I apologise if it is a double post.
Been scanning through the topics, and I can't really find a definative answer.
I have a 1998 Series 2 Nissan Stagea RS Four S(neo engined).
It has developed a strange boost issue, after using the turbo for a short period, it will go from making full boost to making only half boost.
If I stop the car and switch the ignition off, start it again and drive down the road, I will get full boost again for a short time, then the issue will return.
The car is standard apart from an apexi air filter.
Always run on 99 ron petrol.
When the car recieved a full service the mechanic noticed, the recirculating dump valve had been disconnected and blanked off. He reconnected it and plumbed it back in, however I didn't experience the boost loss immediately after this had been done.
Is it safe to run the car without the recirculating dump valve? I experienced no issues before the car was serviced, apart from coilpack failure, the car mis-fired and shuddered from 3800rpm to 5000rpm.
I have checked all the hoses and can't find any leaks.
I have been told it could be a temp sensor, near the top radiator hose.
The recirculating valve could be leaking.
The turbo actuator, could be sticking open.
Does anyone else have any suggestions, or let me know if you have experienced this problem.
Cheers everyone