00561 and low boost

[sjw185]

Maybe the O2 sensor got disconnected or damaged in the process?

Possible, will also check exhaust system for leaks around the downpipe if this effects the lambda readings?

[UrS4boy]

Thinking back I never got 00561 until I changed the exhaust system Dec last year.

Maybe the O2 sensor got disconnected or damaged in the process?

[sjw185]

Moral of the story is to look back at 'The improvements' you have made since the car ran properly!
Lets hope its something as simple as the N75.

Good point, Ive not worked with the car for a year really and because I work offshore I do some stuff with the car then it gets left for a few months then i forget where im at.
Thinking back I never got 00561 until I changed the exhaust system Dec last year.


cheers

Steve

[twoqu]

Moral of the story is to look back at 'The improvements' you have made since the car ran properly!
Lets hope its something as simple as the N75.

This might help to eliminate the TPS.

http://www.s2forum.com/forum/showthread.php?t=58867&highlight=tps

[sjw185]

Good luck making any proper boost with that...
At least I was unable on a few cars. Fitted back N75, problem solved.

TPS is verified using VAG-COM measuring blocks.

I didn't think these valves were a issue never heard any bad reviews about them.
Looks like I will be giving Mesel some extra Christmas presents.

Cheers

Steve

[sjw185]

But basically in comparing the two dyno tests you have less boost and a weaker mixture now.
Pretty sure in Vagcom there is a chanel for the TPS which is what the ecu see's rather than the resistance if you see my point.
Did you do the exhaust after the first dyno?

Yea that first dyno had the original system including cats.
Was quite excited about getting the new system with no cats but no improvement was felt
Will check the TPS in the morning

Cheers

Steve

[twoqu]

Think Dmitri has a point!

[twoqu]

But basically in comparing the two dyno tests you have less boost and a weaker mixture now.
Pretty sure in Vagcom there is a chanel for the TPS which is what the ecu see's rather than the resistance if you see my point.
Did you do the exhaust after the first dyno?

[prj]

Fitted wgfv (mac valve)

Good luck making any proper boost with that...
At least I was unable on a few cars. Fitted back N75, problem solved.

TPS is verified using VAG-COM measuring blocks.

[sjw185]

[QUOTE=twoqu;691390]So what if anything has changed since the last dyno? Link here in case thats of any help:

http://www.s2forum.com/forum/showpost.php?p=469976&postcount=111

Seem to recall that the lambda is only concerned with idle mixture and perhaps cruise, it does not monitor the mixture full time. Could be wrong Worth verifying.
I think the TPS is involved in boost control so might be worthwhile looking at its function and checking its operation via Vagcom.

I found the fault with the injector and replaced the following components since then:

Injector
Replaced atmospheric DV with 710
Replaced vac pipe work
Fitted fuel pump
Fitted new fuel filter
Repaired fuel lines
Fitted wgfv (mac valve)
Fitted new flow regulating valve on breather pipe work
New spark plugs
New coil
3"downpipe and scorpion exhaust
I did check the throttle pot resistance before and it was ok

[twoqu]

I was close!

http://www.s2forum.com/forum/showpost.php?p=559634&postcount=102

[twoqu]

So what if anything has changed since the last dyno? Link here in case thats of any help:

http://www.s2forum.com/forum/showpost.php?p=469976&postcount=111

Seem to recall that the lambda is only concerned with idle mixture and perhaps cruise, it does not monitor the mixture full time. Could be wrong Worth verifying.
I think the TPS is involved in boost control so might be worthwhile looking at its function and checking its operation via Vagcom.

[sjw185]

What fpr are you running, 3.8bar or 4bar?

4bar

[twoqu]

What fpr are you running, 3.8bar or 4bar?

[sjw185]

Thanks for the input Gents, more information below.

UrS4boy

Don't scratch your head, re-read my post and look for boost leaks (despite what the smoke test indicated, you likely have a split hose that only opens under boost, say 1 Bar,

Have done a pressure test to 1bar with diving bottle and only problem I could find was air escaping out the ISV electrical connection end. I changed it out for another which was better but still formed small bubbles at 1bar

twoqu

This might be another case of the R201 resistor!
Are you using RS2 S/W in a ABY ecu without a change in the resistor?

ECU work was done by S2 central including setting up VMAP also it has boosted correctly before but had other issues with injectors and bad coils etc

prj

Running lean due to a faulty injector?
Have you measured compression? Are you sure one cylinder is not gone?

I had the car on a dyno a year ago and the guy didint want to push it due to it going lean?
He suggested fuel filter and possible dodgy spray pattern on injectors
I then changed fuel filter and found I was getting a black plug on number one cylinder
I started changing coils etc but it turned out to be the injector
I did do a compression test earlier this year they were all pretty equal at about 11bar

A80Avant

good checks all of the above, however, im with those that say boost leaks, and also check for any vaccum hoses that may have gone, clean the MAF if dirty, check the ISV hoses as they tend to go and create a boost leak.

from memory, lamda would also come up if lamda was at fault as well, but i may be mistaken.

I did clean the MAF and checked connection, renewed all hoses with 4mm silicone at the back of the intake manifold
also Ive seen other posts that included the Lambda fault code but when the guy tested the voltage pulse on my lambda probe he said it was a bit low so decided to fit one.

AndyP

When you changed the injector, did you just change the one that was faulty? I'd always fit injectors as a flow matched set.

Yes only changed one, Had the injectors tested and cleaned but even after that one was found to be at fault.

cheers

steve