Recent boost issues.....

[960kg]

Secondhand parts are cheaper and often work great for thousands of miles. Hence the huge demand for used parts. Not everyone has the money to run to the dealer every time they need a part!

I understand what you are saying Mitch, but if you look further than your nose you may of fitted a 2nd hand BCS/TCV but how do you know it works ok because mine did not, it worked but i smelled a rat and changed it £51......so i could sell my faulty one and nobody would know the difference and then they would look elswhere and maybe have to spend more cash on another part when the 2nd hand BCS is at fault.

You really have to see what 2nd part is the one to purchase as would you buy 2nd hand disc pads?? no, of course you wouldn`t but they are still cheaper than new ones and they will work, but you still wont buy them!!

Would you buy a 2nd hand fuel pump an FPR a fuel filter the list is endless as you don`t know how many miles they have covered or there condition you can merely buy other`s problems.

Headlights etc. and all the superficial stuff yes, i can understand to get you through but not engine performance parts.

I think you should think about my post as finding the culprit is only a matter of elimination with new parts and not 2nd hand ones.

After 46yrs of my cars as a hobby i have learnt never use names that have let you down or 2nd parts on the engine as it will bite you back....... eg: Service on my Lotus Cortina ....misfired for two weeks replacing the coil, leads rotor arm cap, the lot and came back to the plugs which were NEW and faulty Champion ones, i have never bought anything Champion since.

Especially in this day and age everyone is trying to grab money and where is a better place, 2nd hand car parts, they sell faulty ones as well as i have seen it myself.

I agree money is short but it will cost more in the end especialy those racking there nerves about there problem and need a result.

[Niles]

FYI, the diagram from Volvo on the vacuum/boost hoses to the BCS is wrong. I've repeated this statement many times but references are still being made to the Volvo diagram (for M4.3). The M4.4 is correct though.

@oblark :

FACT : With the condition that the interlocking spring clip for the BCS connector is facing upwards, then if you look from the top, the highest port coming out from the BCS, goes to the wastegate actuator. The middle port is back to the intake tract. The bottom port is going to the turbo snail.

FALSE : The volvo diagram shows the opposite for the top and bottom port. They could not be fully blamed though as they did not state which way the electrical connector is facing.

I totally agree. the diagram shows that the turbo compressor snail vac pipe gos to the 'top' of the BCS vac pipe. it gos to the bottom vac pipe!!!!!

[oblark]

At the southern softies meet today I removed the MBC and tried another remapped ECU, went for a drive and the boost was back to 1 bar.
The problem looks very much like a ECU boost problem.