Ibiza cupra PD160 Revo limp mode in 6th gear

[jscottuk]

I'm wondering what is causing my mk4 PD160 ibiza cupra to go into limp mode. It tends to happen at low revs in 6th gear.

I don't get any errors and have replaced the MAF about 6 moths ago. It has only happened 4 times, but that is in the last few weeks.

I've read the forums and people suggest N75 sensor. Please can someone look at my vag-com readings and let me know is there is anything suspect.

Do you think the pipes are ok?

'011			
Engine speed	Spec. intake press.	Actual intake press.	D.cycle MAP
2850-3150	2300-2600	2200-2800	35-80%
 /min			 %
1701	996	1176	33.1
1701	1068	1152	33.1
1659	1308	1092	25.1
1134	996	1164	30.7
1743	1164	1152	33.1
2163	1224	1128	39.4
2142	996	1080	38.3
1680	1356	1212	32.3
1764	1404	1308	33.5
1827	1416	1380	34.7
1974	2388	1692	26.7
2268	2592	2460	48.2
2604	2616	2988	67.3
3024	2616	2988	72.9
3423	2616	2796	68.5
3801	2616	2724	75.3
4137	2532	2640	78.5
4452	2424	2544	81.3
4599	1152	2448	94.4
3381	1056	1584	46.6
3255	1056	1344	46.2
3150	1044	1272	45.4
3003	1044	1248	45
2835	1032	1212	43.8
2709	1020	1200	43
2541	1020	1188	41.8
2415	1008	1176	41
2247	1008	1152	39.8
2121	996	1140	38.3
1953	996	1116	36.7
1890	996	1104	35.9

Thanks

 

[jscottuk]

Does this Look normal? When I first press the throttle?

1974 2388 1692 26.7 there seems to be quite a difference between Spec. intake press and Actual

Any ideas, would that suggest N75?

By the way, this was in 3rd and doesn't cause limp mode.

 

[jscottuk]

I seemed to have fixed it and the car performs much better.

I used vag com to recalibrate the MAF and EGR .

 

[jscottuk]

Did another check but still overbosting. Going to take into AMD to get the VNT can ERG checked / cleaned.

It does seem to run much better now. Maybe putting the VNT into test mode, loosened something.

 

[Ibiza 130 tdi]

Mine would overboost in any gear if you kept the boost up, turned out it was overboosting badly due to mapping/wrong hybrid turbo. Too much pressure was building up in the turbo and sent the car into limp mode.

 

[Disco_Biscuit]

Could be the boost leak or the vanes in the turbo sticking causing over boost, classic problem with this kind of turbo.

 

[jscottuk]

This was just the MAF. The pipercross filter let water in . Back to standard paper filter and all good again.