troubleshooting auq

[Liam180cupra]

I have replaced all boost pipes with silicon hoses.

I have also replaced the MAF, MAP, Diverter valve.

I have also replaced the intercooler with an aluminium side mount.

I have all the vac pipes coming to replace under the inlet manifold along with the breather.

I am thinking this problem isn't a leak anymore as there is pretty much nothing else to change.

I have done the spraying brake cleaner on pipes to see if the engine pitch changes.

I have had the vag com on it and the fuel trim reading are running mostly in the - figures and occasionally going into +.

I need a few pointers and were to look next.

I am determined to sort it as i can change most things at the cost of one trip to a specialist to be told they cant find anything which has happened a few times.

 

[Bigjohn84]

What's happning mate

 

[Liam180cupra]

still running rough.
Reset all codes and seemed to be abit better but then it just ended up going back to the way it was.
All pipes are still tight and no leaks that i can see with the items i have replaced.
On partial throttle its ok then when i put my foot down abit the turbo attempts to spool but no increase in power that i can feel or very little.
All the pipes that could cause a big leak have been replaced and i doubt a vac leak would make it run so badly.

 

[Bigjohn84]

Have you had VCDS on meaning messuring blocks to see what's running and how there running, when was your fuel filter done? Also N75 valve? I've a spare one hear letter F.

 

[Liam180cupra]

Yeah had it on measuring blocks. Tried another n75 that was working fine and it made no difference.
Saw nothing that really stuxk out on vcds but i havnt had it on a run with vcds.
On the fuel trim 032 033 is -lean and + rich?.
Im not sure when the fuel filter was changed. It does look new but worth a change

 

[Bigjohn84]

Lean and rich,,,,,,,,,it should be like -80+120 should be bouncing back and forward to like those numbers, lean to rich constantly and on idle, what's urs doing?

 

[Liam180cupra]

I took this reading a few weeks ago
idle o2 adaption -0.4
run o2 adaption - 3.9
o2 reg pre cat -4.7 3.9

It is sitting in the - and occasionally going into + every now and then.
Those numbers aren't constant though they are the highest that came up when reading the fuel trim

 

[Bigjohn84]

If your cars always in the - then your cars running Lean, it should be bouncing back and forward from - to +, not much tho, if it's staying in the - end then it's running lean, if it's staying in the + side it's running rich, if it's bouncing back and forward then it's bang on

 

[Bigjohn84]

On the idle whats it on - and +? Or is it just staying in the - all the time? What fuel you using?

 

[Liam180cupra]

its mostly in - on idle and im using v power 99 octane

 

[Bigjohn84]

I don't use V power mate, nothing but problems, my mate found that out lol, if your cars not tuned up and mods in it don't bother with V power, so ur cars running lean then, have you checked you o2 sensors with VCDS, if not check them mate pluss change ur fuel filter, I'm not sure if you have full VCDS if yes, engine, messuring blocks group 30-49 for sensors

 

[Liam180cupra]

Ill put normal fuel in it then and see what happens.
Im away this weekend but ill grab a fuel filter for when i get back.
Ill check vag com in an hour or so as i do have the full version

 

[Bigjohn84]

Mate totally up to you what fuel you use, people on hear will argue with you all day long about V power, I'm just saying from exsperiance, plus if the cars not de cated or tuned up there's no point using it, VCDS block 30 to 49 also 7-8-9-10, you want ur car up to temp first before you check ur sensors so block 134. Let me no how you get on

 

[Liam180cupra]

Measuring blocks on vcds at idle
Pre cat o2 111/011
Post cat o2 110/010 started off at 000
Lambda factor 0.984-1.016
Lambda factor 1.000
Idle adapt 0.80%
Run o2 adapt -5.50%
Pre cat o2 reg -2.3/0.8 rich lean constantly
Pre cat o2 v 1.56
Rpm 720/760
Cat temp 305 degrees
Pre cat duration 1.858
Post cat o2 v 0.17
Engine load 18%
Post cat o2 dwell -0.004
Cat temp 250 degrees
Amplit ratio 0.13
Spec boost 990
Actual boost 1000
Mass flow 2.5

 

[Bigjohn84]

Mate ur readings look fine to me, I think you should change your fuel filter, you may just have a blockage, I had bother last hear with hesitation sometimes, I changed my fuel filter and all was good

Idle is a tad low but that's ok

 

[Bigjohn84]

Idle abit low prob down to fuel filter, I think u should just change it mate if it's the last thing, all does look good tho mate

 

[Liam180cupra]

Ill grab one tomorrow and get it changed.
Sorted the lean running out. One of pipes jubilees had broke.
Ill let u know how fuel filter goes

 

[Bigjohn84]

Have you changed one before the fuel filter

 

[Bigjohn84]

Go on VCDS in the morning and go into engine block 101 to 109 that's for fuel injection and block 110 to 119 boost presure Control

 

[Bigjohn84]

Your sensors are good mate I just looked and seen so don't worry about them