00561 and low boost

[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.

[twoqu]

I was close!

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

[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

[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.

[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?

[twoqu]

Think Dmitri has a point!

[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

[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

[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]

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

[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]

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?

[twoqu]

Looking at the possible causes for the code, one is of an exhaust leak up to the catalyst!
I wonder if the limit not reached is basically indicating a lean mixture which the lambda cannot control. Whether that is down to the exhaust/downpipe improvements or a leak remains to be seen.
That fault comes up regularly and seems tricky to nail down with Lambda replacements only temporarily curing the problem. We know the RS2 had a less restrictive exhaust but perhaps whatever map controls the Lambda needs a bit more tweaking to eliminate that particular fault code.
Not sure if that code has any effect on the rest of the range other than at idle. Be interesting to know!

[AndyP]

When you did the boost leak test, did you check the vacuum lines? If not, try this

http://www.s2forum.com/forum/showpost.php?p=471734&postcount=41

You'd be suprised how even the tiniest leak on a vac line can cause the car to run like s**t.

[prj]

My vote is also that it has a boost leak, coupled with a few other problems.

It should not run that rich at only 1 bar of boost. It should run this amount of fuel at about 1.8 bar.
At 1 bar you would see 13 AFR or so.

This together with the lambda code tells me that there is a leak somewhere and that the pressure test was not performed correctly...