00561 and low boost

[prj]

MFTS is on/off. You will have no boost at all with that (0.4 bar).

Can you post Group 000 log on hot idle?

EDIT:
Also group 002, preferably when the fault is present.

Also, you might want to remove the MAC valve and fit a std. N75.

[sjw185]

Have done some more testing and boost is definitely higher 1.3/1.4 bar after car has been warmed up then switched off 10/15mins then driven again?
I disconnected MFTS as that was the likely suspect but boost was still not improved?
Also 00561 has returned

[Rusty]

@Dave, ABY has a slightly revised setup over the 3B in the area you asked about. The XM & IC are different and the accordion hose, short length of normal hose and joiner are replaced by a single hose.

Bunging the hose at point 25 is only useful for testing the IC and turbo circuit but as prj says, testing the whole thing is best as the vac lines, IM, injectors, injector holders, ISV etc. are all potential leaks, as are all the gaskets

[prj]

No, that's a bad idea.

Best way is to:
1) Remove the maf->turbo hose from the MAF.
2) Fit a bung into the maf->turbo hose with a nipple.
3) Disconnect the breather connection from the maf->turbo hose
4) Block off the breather connection in the maf->turbo hose. While doing this take care not to drop anything into the intake and cause your turbo a case of the munchies.

Now pressure test it.
That way all the vacuums and so on get pressure tested, as well as the breather check valve.

Most of the leaks are not between the throttle body and the turbo outlet, they are usually in the hoses connected to the inlet manifold.

[UrS4boy]

Managed to do a boost leak test today...Steve

When you guys do a boost test on your 3B/ABY/ADUs, do you normally put the pressurizing bung in Hose 12 at the turbo discharge end and plug off hoses 22 and 25 at the Throttle Body? What is Item 25 after the corrugated hose 15 (which we can the Michelin Man on the AAN) going to the throttlebody, after the cross-over tube/cross member? Item 25 seems to be 3B only with something different for the ABY (and ADU). Yes? No?

And what about the PCV system, if the one-way valve doesn't work, boost *WILL* get by and into the PCV system.

[Rusty]

The PCV valve has nothing to do with boost leaks, so it'll not be that.

As prj says, it's the 1 way valve on the N80 T piece that's the issue, as it stops the boost entering the breather system.

You can block off the IM connection or just run the N80 valve straight to the IM and block off the breather, either to prove that the check valve is good / bad or to get rid of it altogether.

[sjw185]

Do you mean the PCV valve - the big black mushroom looking thing?

Yes replaced that but not looked at the check valve before going to check that and do some more driving and see how it looks

[Rusty]

Do you mean the PCV valve - the big black mushroom looking thing?

I have this code every now and again and so do a boost leak check and a few other things, usually find something small and then repeat the process a few months later

[prj]

There is no "breather regulating valve", maybe you are referring to the EVAP valve.

Check valve is behind the manifold, where the EVAP valve connects to, inside the thicker rubber hose.
Make sure that doesn't leak under boost. Although, if you disconnect the breather from the intake and leave it to atmosphere when pressure testing, then that should show up.

[sjw185]

It's in degrees, your throttle angle is good.
Have you checked dump valve and the breather check valve?

You can epoxy the back of the ISV if you want, they all leak there.

710 is quite new but forgot to test the DV by removing from MAf hose seeing if it was passing during test
Fitted new breather regulating valve but not looked at the check valve?

cheers

Steve

[prj]

It's in degrees, your throttle angle is good.
Have you checked dump valve and the breather check valve?

You can epoxy the back of the ISV if you want, they all leak there.

[sjw185]

Update

Managed to do a boost leak test today

First test
I plugged breather pipe on Maf hose, Intake hose after crossmember and fitted my spare boost gauge on the hose to the waste gate to monitor pressure.
1.4bar back to zero took approx 90secs

Second test I removed the plug on the intake hose and reconnected to the engine
wound up pressure to 1.4bar sprayed leak detector on hoses and only found small bubbles at lower ISV connection.
1.4bar back to zero took approx 60secs

Swapped out WGFV for new one.

Went for a drive and still around 1bar boost.
The car was stopped for 30min while visiting a mate tonight, found it was boosting better will try more test runs in the daylight tomorrow.

Pulled codes just now and found no faults so hopefully 00561 has been cured by the new lambda probe I fitted a month ago.

Checked throttle angle in vagcom

throttle angle 8.7% shut 96.1% WOT

Take it should be 100%?

Cheers

Steve

[prj]

So is this code only related to idle (vac) and transient vac/atmospheric conditions? I think people get worried as they think the Lambda controls the fueling throughout the range. So a faulty Lambda sounds like a disaster.
As the OP has the not reached problem might this be related to a fuel pressure issue such as using a 4bar rather than a 3.8bar fpr. Although it does not explain why the 00561 only appeared after the downpipe/exhaust was changed unless there has been some subtle change in the Lambda position that has effected something.
If the hoses are ok then might it be something like the injector inserts. If its leak free, then possibly the MAF.

In this ECU the fuel trims do not affect WOT operation... When it goes open loop, all it reads are MAF and RPM for fueling and ignition.
If the MAF is defect and an error condition is present, then the throttle plate angle is used instead of the MAF signal.

[twoqu]

Note on fault code 00561:

◆ add = additive - The fault has less effect as engine speed increases.
◆ mul = multiplicative - The fault has more effect as the engine speed increases

[twoqu]

So is this code only related to idle (vac) and transient vac/atmospheric conditions? I think people get worried as they think the Lambda controls the fueling throughout the range. So a faulty Lambda sounds like a disaster.
As the OP has the not reached problem might this be related to a fuel pressure issue such as using a 4bar rather than a 3.8bar fpr. Although it does not explain why the 00561 only appeared after the downpipe/exhaust was changed unless there has been some subtle change in the Lambda position that has effected something.
If the hoses are ok then might it be something like the injector inserts. If its leak free, then possibly the MAF.