LCR, remap and running lean!

[Gubien]

Hi!

Found out my car is running lean and that must ofcause be fixed!

But, when searching for the common "pressure drop between dv and turbo" which disappeared when the weather got better I decided to try a MAF change.

It didnt help at all, but back then I tought I might as well stick with the new, rather than the old... So...

Could that have anything to do with my car running lean now? Thats the only thing thats changed on the car since...other than the N249 bypass, which I DONT think is causing that.

Can I do anything worse by switching to the old MAF again?

BTW. Thanks to the three guys in here that made me aware of that!

 

[D.K]

Have you tryed resetting the ECU ???
I know somwone who was getting bad MPG, he changed the MAF and it was the same, Finally he reset the ECU and it cured it.
I'm not saying it will cure your problem but it's worth a try.

 

[Gubien]

How can I reset ECU? With vagcom? Or is it the battery "fix" ...

 

[D.K]

Disconect the battery and leave it for 30 min's.

 

[Gubien]

Might try that, worse case is my clock will go loco..

 

[D.K]

Dont forget your radio code too if your still useing the OE one.

What other mods have you got ??? I take it you've changed the DV

 

[Gubien]

LCR 210, BMC CDA-SP12(Will get rid of that crap), FORGE 007(Yellow spring), N429 Bypass and then the remap.

Pretty standard as you can see

 

[Gubien]

But this is done after the remap, N429 Bypass, FORGE 007(Yellow spring) instead of a baily DV-30 and change of MAF

 

[Nev_LCR]

how would you know that its running lean???

 

[Gubien]

Lamdba should be around 0.780 full boost, mine is a "bit" over that...

Group A:	'115				Group B:	'031	
	RPM	Load	Absolute Pres,	Absolute Pres,		Lambda Factor	Lambda Factor
TIME					TIME		
STAMP	 /min	%	 mbar	 mbar	STAMP		
0	1080	21,8	1000	1000	0,7	1,008	1
1,42	1080	18	1000	1000	2,08	1,016	1
2,73	1120	72,9	1410	990	3,41	0,953	0,961
4,03	1440	77,4	1540	1090	4,59	0,945	0,953
5,14	1800	85,7	1680	1200	5,72	0,953	0,953
6,31	2240	106,8	1970	1400	6,91	0,953	0,953
7,47	2760	143,6	2220	1850	8,12	0,961	0,953
8,75	3560	191,7	2540	2540	9,45	0,961	0,953
10,05	4520	191,7	2550	2490	10,61	0,961	0,953
11,19	5280	176,7	2340	2320	11,75	0,961	0,953
12,3	5920	170,7	1900	2110	12,91	0,914	0,953
13,53	6360	115,8	1600	1620	14,16	1	0,969
14,81	5040	21,1	1000	1120	15,47	1	0,992
16,11	4840	12	1000	1030	16,8	1,991	1,047

 

[Nev_LCR]

ah ok, it could be a few things though,

any other fault codes???

 

[Gubien]

Yup I guess it could. But I just have to think back... But it could also be a faulty 02 sensor, but my sparks plugs I changed 2000km ago didnt lie.See link

Btw. No fault codes at all.

 

[Nev_LCR]

ah ok, i thought maybe lamda sensor.

 

[Gubien]

I hoped for the same (

 

[wild willy]

Dude, take a look at your logs again. Your car is giving you what your map is requesting. It looks like a mapping issue to me in that the map is requesting too lean a mixture. Should be around 0.85 under full boost.

 

[Gubien]

I see that, but it still runs lean? It run rich according to what the MAP requests. But the MAP shouldnt request 0.95? The remapper says he always aims for 0.78, so thats way off?

 

[wild willy]

I see that, but it still runs lean? It run rich according to what the MAP requests. But the MAP shouldnt request 0.95? The remapper says he always aims for 0.78, so thats way off?

On the logs you posted above the car is running lean.
Your right the map shouldn't be requesting 0.95.

 

[Gubien]

Running very rich? Now I'm confused! Why is my sprak plugs then all white?(Did you se the picture?)

 

[Gubien]

Ok, read about the stuff. 14.7 x lambda value.

Anything below 14.7 is rich.
Anything above 14.7 is lean.

Correct understood? So my car is still running rich, but close to running lean?

 

[wild willy]

the data obtained form vagcom is more detailed than a colour check on a plug. More importantly the plug colour is the result of fueling across all driving conditions not specifically under full load which is what we are discussing here.