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[JamesV6CDX]

What values would be most useful Kevin?

[Andy H]

I'd have thought the ECU would have shut it down before the boost got high enough to fracture ducting, unless someone has been playing with the mapping.

Could well be a blockage between turbo and MAP sensor though. Need some live data from it, really

I wonder where the MAP sensor is located if it is after the intercooler that could point to a blockage in the intercooler.

[serek]

I'd have thought the ECU would have shut it down before the boost got high enough to fracture ducting, unless someone has been playing with the mapping.

Could well be a blockage between turbo and MAP sensor though. Need some live data from it, really

I wonder where the MAP sensor is located if it is after the intercooler that could point to a blockage in the intercooler.

in intake manifold at back of engine

[Marks DTM Calib]

It's worth cleaning the manifold pressure sensor and ports

[JamesV6CDX]

The only fault code is "boost pressure too big"

Looking on live data the charge pressure with the engine at idle is 1000mbar

[aaronjb]

1bar over atmospheric at idle would be impressive so that suggests it's an absolute reading; 1bar being standard atmospheric pressure i.e. 0 boost..

What about when you're (significantly) off idle and under load?

[Kevin Wood]

I think "boost pressure too big" and a penchant for splitting the intake ducting tells us something.

Depends how the boost pressure is controlled on this engine, but something's clearly amiss in the control system. It would be good to see how the boost pressure behaves under load, indeed.

[JamesV6CDX]

There are apparently two "pressure control valves". If It would stop raining I'd be able to have a look!

Annoyingly my cable isn't long enough for live data, the diag port is under the bonnet!

[STEMO]

I'll be down your way this weekend, so I can help you out.

I'll razz along in the car while you sit on the bonnet with your laptop. 

[TheBoy]

There are apparently two "pressure control valves". If It would stop raining I'd be able to have a look!

Annoyingly my cable isn't long enough for live data, the diag port is under the bonnet!

Jesus, how old is it

Regulations for last 15years have been it must be in cabin, within 1m of steering wheel.

[aaronjb]

There are apparently two "pressure control valves". If It would stop raining I'd be able to have a look!

Annoyingly my cable isn't long enough for live data, the diag port is under the bonnet!

Jesus, how old is it

Regulations for last 15years have been it must be in cabin, within 1m of steering wheel.

The BMW E39 is the fourth generation of BMW 5 Series, which was sold from 1995 to 2004

Somewhere in that range I'm guessing it's the earliest round diag port (looks rather like a small trailer socket) under the bonnet, before they moved to OBD ports in the cabin, late 90s..

[05omegav6]

Technically the scuttle is within a meter of the wheel

No point having rules if you cannot interpret them to suit...

[JamesV6CDX]

Technically the scuttle is within a meter of the wheel

No point having rules if you cannot interpret them to suit...

Manifold off. Noticed a few things, will update later

[henryd]

There are apparently two "pressure control valves". If It would stop raining I'd be able to have a look!

Annoyingly my cable isn't long enough for live data, the diag port is under the bonnet!

Jesus, how old is it

Regulations for last 15years have been it must be in cabin, within 1m of steering wheel.

Some Beemers circa 2000-1 have both types of diag plugs,16 pin under dash,old BMW round plug under bonnet

[JamesV6CDX]

Having taken the inlet manifold off ALL the vacuum hoses are perished to nothing. I believe they are collapsing internally under any sort of pressure. So all vacuum hoses will be changed.

I cannot work out if there is a Very small trace of metal filings in the inlet ports on the head !

There are none I can see in the boost pipes.

EGR is coked up badly. Have ordered a replacement EGR blanking kit

Swirl flaps are all present but have ordered a blanking kit

When removing the manifold one of the rubber backup washers with a metal ring is unaccounted for. Can't find it anywhere. Am worried it's fallen into an inlet port on the head.

I've ordered a bore scope. It may just be in a nook or cranny or maybe was never there. But I don't want to wreck the engine!