Boost Pressure Control Valve (N249): Mechanical Malfunction

[Mr OCD]

Just scanned the LC with VCDS before doing some logging in a bit and see this code...

Checked visually and see no issues... funny how this code has only popped up after it visited the main dealer for coil packs ...

Will clear it in a moment and go for drive - any ideas?

 

[gb]

you not done the bypass
http://www.seatcupra.net/forums/showthread.php?t=312083

 

[LEE69]

Make sure it's plugged in, is a bit of a coincidence eh

 

[Mr OCD]

Tried the N249 bypass and RR'd before and after... Went back to using N249

Tell me about it Lee!

 

[LEE69]

Hardly ever heard of them failing tbh

 

[car.crash]

I still have mine fitted but I can't see why you would remove them if they don't fail?

 

[Mr OCD]

Just cleared code and been out for a drive to do logging and the code is back again...

 

[Mr OCD]

Well logging shows car running well although IAT's of 45degc in this temps is hilarious...

I'm wondering if taking boost gauge off the DV is causing the issue?

 

[CupraRmark]

One way to find out !! Kink the boost gauge pipe with a cable tie and then re try your logs

 

[LEE69]

Well logging shows car running well although IAT's of 45degc in this temps is hilarious...

I'm wondering if taking boost gauge off the DV is causing the issue?

No you can take the feed from any vacuum point.
It is still connected to the loom under the plate?
Loads of done the delete, I'm sure there will be one flying around.

 

[Mr OCD]

Boost Log

 

[Mr OCD]

Boost Log

Group A:	'115				Group B:	'031	
	Engine Speed	Engine Load	Charge Pressure	Charge Pressure		Lambda Sensor	Lambda Sensor
TIME			(specified Value)	(actual Value)	TIME	Current Value	Specified Value
STAMP	 /min	%	 mbar	 mbar	STAMP		
1.43	840	12.8	1000	1010	1.92	0.938	1
2.32	1120	48.1	1000	1010	2.72	0.86	1
3.12	1360	75.2	1120	1050	3.52	1.016	1
3.93	1760	80.5	1340	1180	4.33	0.977	1
4.74	2200	97	1310	1350	5.23	0.961	0.953
5.63	2680	85.7	1150	1350	6.05	0.875	0.945
6.54	2320	13.5	1000	1130	6.94	0.75	0.945
7.34	2080	69.2	1000	1200	7.76	0.899	0.945
8.16	2160	48.1	1000	1110	8.65	0.891	0.938
9.05	2360	107.5	2230	1330	9.45	0.844	0.899
9.87	2760	164.7	2260	2120	10.37	0.899	0.891
10.77	3360	191	2160	2300	11.28	0.891	0.891
11.79	4080	191.7	2110	2360	12.27	0.891	0.891
12.68	4680	182	2020	2220	13.08	0.867	0.867
13.49	5160	170.7	2010	2100	13.92	0.852	0.86
14.38	5600	160.2	1930	1940	14.8	0.844	0.852
15.2	5960	153.4	1880	1860	15.61	0.844	0.852
16.11	6320	145.1	1910	1830	16.51	0.758	0.86
17	5280	16.5	1000	1190	17.44	0.766	0.938
17.94	4720	11.3	1000	1190	18.41	1	1.047
18.83	3120	12.8	1000	1070	19.31	0.75	0.891
19.72	3160	12	1000	1040	20.22	0.899	0.938
20.63	3120	11.3	1000	1030	21.02	0.961	0.938

 

[Mr OCD]

Well after mucho discussion it does seem as though the DV could be playing up ... or a possible boost leak ... so that's tonights job

If after checking the above still flagging fault then I will bypass the N249 as a test.

 

[LEE69]

Boost leak is generaly 17705

 

[Mr OCD]

Boost leak is generaly 17705

Only major leaks mate will flag that code... tiny ones aren't usually flagged.

 

[Mr OCD]

Boost leak is generaly 17705

Anyway given the log I can't see a boost leak ...

I think the DV is either pissing about or the N249 is faulty.

 

[Rob Kelz]

I get this from time to time aswell mate, I think it is just where I have the N249 bypass tho?

 

[Mr OCD]

I get this from time to time aswell mate, I think it is just where I have the N249 bypass tho?

I have no bypass... tried it and didnt like it...

 

[milner575]

well if the dealer changed the coil packs, they removed the n249 to get them out yeh? so they broke it in other words. sounds about right lol

 

[Mr OCD]

Yeah my thoughts as well... I'm removing tonight to see what they have ****ed up