S6 timing

[HMS-S6]

Also while I'm checking stuff. Where do the ECU's grounds attatch to the body on the S6?

[HMS-S6]

6: ECU temp sensor

[HMS-S6]

Providing I rule out poor spark I have;

1: Fuel pressure
2: Boost reading at ECU
3: Throttle position
4: Air flow through MAF
5: Injectors

Is there any factor I have missed out regarding WOT mixture control or anything that isn't a factor!?

[HMS-S6]

Thing is with the plugs, I removed a NEW set of Bosh plugs, popped in the NGK's and literally no difference. Nor does it explain how it suddenly drops from 13.x AFR to high 14's.

[HMS-S6]

But you are still getting @ 1 bar of boost?
Where are you teeing off for the gauge and does it tally with the in dash one?

Yes it matches up perfectly.

[HMS-S6]

Might be faulty logic but we are now looking at the very last components in the chain - injectors and spark plugs.
You seem to have enough fuel pressure/volume. The ecu controls the injectors by grounding them. They are fed effectively battery power with engine running. So that leaves just the actual injector!
By replacing all the coil gubbins with the coil conversion you are only left with the plugs!
If there are no boost leaks then they are the other parts of the combustion process other than the actual physical compression in the cylinder!

Hi, yes although a second new set of plugs went in on Friday and made no difference. I have also checked the injectors and swapped them from a good car. Also no difference at all.
I'm starting to wonder if some of these parts (coils) have the correct earth/feed.

[twoqu]

The NGK BKR-7EIX ? What have you gapped them at?

[twoqu]

But you are still getting @ 1 bar of boost?
Where are you teeing off for the gauge and does it tally with the in dash one?

[twoqu]

Might be faulty logic but we are now looking at the very last components in the chain - injectors and spark plugs.
You seem to have enough fuel pressure/volume. The ecu controls the injectors by grounding them. They are fed effectively battery power with engine running. So that leaves just the actual injector!
By replacing all the coil gubbins with the coil conversion you are only left with the plugs!
If there are no boost leaks then they are the other parts of the combustion process other than the actual physical compression in the cylinder!

[HMS-S6]

Yeh. It had new Bosch and as of Friday it now has new NGK. only thing I'd add is that the car certainly doesn't have a miss fire as such. I used to spot a misfire on a V12 engine a mile offso im sure I'd feel it on an I5. It's still smooth, just 'flat'

[twoqu]

Have we discussed plugs?
As you have said, I am not sure how you would determine whether its a lean mixture or misfiring.

[HMS-S6]

Is there any way I can check its a Mixture OR Spark problem before I go looking the wrong direction?

[HMS-S6]

Well I'm back on stock map now but when I checked last year yes it was 5.4 at 1.4 bar. I can check this again Monday anyways though. Not afraid of double checking by now. Lol.

[newsh]

Yeh I'm really sorry but yeh they are all new too. Plus the fuel pressure is fine when it's running lean.

So at 1.5 Bar of boost you have 5.5 Bar fuel pressure? Just checking.

[HMS-S6]

I know you've pressure tested but ... The small vac line which goes to the FPR from the inlet manifold, I think on the AAN there are 2 short pieces of cotton covered vac tube and a chrome plated hard line. If one of those 4 clips is a little loose and the rubber tube has gone a bit hard, then you can pressure test and get no leaks but go vacuum and it moves the pipe a bit and it leaks, next time you go on boost it may leak or it may not. I had this on the vac line to my ECU, the clip was done up tight but it leaked sometimes after lifting off and going back on boost. If the leak is in the line to the FPR then it will go lean on boost and occasionally rich on idle.

I guess you're probably going to reply that the hose and the clips are all new! But it's worth a look just to see.

When you pressure tested, did you finish up with soapy water and look for bubbles?

Yeh I'm really sorry but yeh they are all new too. Plus the fuel pressure is fine when it's running lean.