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This fault has come today It is an ongoing issue it has intermittently come and gone. Ive been trying to find out what it is but to no avail.

I have changed maf DVs Fuel P regulator MAP sensor 246 valve and it goes away but back it comes.

Now it is really serious as im sure you can see but what is causing it ???>>>???? I just dont know! Seriously bad now.

Booked into Mrc but 200 mile to get there, What do I do?


If I restart the car the ecu goes back to normal but I looked at lambdas and wow they were Trimming -25 on part throttle both sides.

This must be related to the issues im having.

17965 - Charge Pressure Control: Positive Deviation
P1557 - 35-10 - - - Intermittent
17537 - Fuel Trim; Bank 2 (Mult): System too Rich
P1129 - 35-00 - -
17535 - Fuel Trim; Bank 1 (Mult): System too Rich
P1127 - 35-00 - -

Block 1

0.36 600 94 -20.3 -18.8
0.65 560 94 -21.9 -19.5
0.96 600 94 -23.4 -21.1
1.25 760 93 -0.8 -0.8
1.56 800 94 0 0
1.86 680 94 0 0
2.17 800 94 0 0
2.47 1800 94 0 0
2.77 1440 94 0 0
3.07 1080 94 0 0
3.38 800 94 1.6 1.6
3.68 680 94 2.3 2.3
3.97 480 94 1.6 3.1
4.27 520 94 0 0.8
4.58 520 94 -1.6 -0.8
4.88 400 94 0 0
5.18 520 94 -0.8 -0.8
5.48 560 94 -2.3 -2.3
5.79 520 94 -3.9 -3.9
6.09 480 94 -5.5 -4.7
6.39 440 94 -7 -6.3
6.69 480 94 -8.6 -7.8
6.99 560 94 -10.2 -8.6
7.29 520 94 -10.9 -10.2
7.59 520 93 -12.5 -11.7
7.89 480 93 -14.1 -12.5
8.19 520 94 -15.6 -14.1
8.5 560 93 -17.2 -14.8
8.8 520 94 -18 -16.4
9.1 520 94 -19.5 -17.2
9.4 520 94 -21.1 -18.8
9.7 560 94 -21.9 -20.3
10.01 600 94 -23.4 -21.1
10.32 600 94 -24.2 -22.7
10.61 600 94 -25 -23.4
10.91 600 94 -25 -24.2
11.22 640 94 -25 -25
11.51 640 94 -25 -25
11.81 640 93 -25 -25
12.12 680 94 -25 -25
12.43 680 94 -25 -25
12.73 640 94 -25 -25
13.02 640 94 -25 -25
13.33 1280 94 -0.8 -0.8
13.63 1480 94 0 0
13.94 1120 94 0 0
14.24 880 94 -0.8 -0.8
14.53 680 94 -1.6 -1.6
14.84 440 94 0 0
15.13 560 94 -0.8 -0.8
15.43 520 94 -2.3 -2.3
15.74 400 94 0 0
16.04 480 94 -1.6 -1.6
16.34 600 94 -1.6 -1.6
16.64 480 93 -3.1 -3.1
16.94 520 94 -4.7 -3.9
17.24 520 94 -6.3 -5.5
17.55 440 94 -7 -7
17.86 480 94 -8.6 -7.8
18.15 520 94 -10.2 -9.4
18.46 560 94 -11.7 -10.9
18.75 520 94 -13.3 -11.7
19.05 480 94 -14.1 -13.3
19.36 480 94 -15.6 -14.1
19.66 520 94 -17.2 -15.6
19.96 560 93 -18.8 -17.2
20.27 520 94 -19.5 -18
20.56 520 94 -21.1 -19.5
20.87 560 94 -21.9 -20.3
21.17 560 94 -23.4 -21.9
21.47 600 94 -25 -22.7
21.88 600 94 -25 -24.2
22.17 640 94 -25 -25
22.47 560 94 -25 -25
22.79 640 94 -25 -25
23.08 600 94 -25 -25
23.38 640 94 -25 -25
23.68 640 94 -25 -25
23.98 600 94 -25 -25
24.28 640 94 -25 -25
24.59 560 94 -25 -25
24.89 600 94 -25 -25

Regards,

Please help

Have you checked the F,hose & TBB as I got the same positive charge code and when i eventually found it the TBB was split big style. I also had a dead MAF causing it to run lean, infact Doug acually commented on how lean it was running
I took mine into MRC on wednesday and it was well worth the 220 mile round trip for me

It's A RS4 so it's not got them fitted ....

Doh .............. I forgot flashyg's is an RS4

sorry lads just asking here if any one knows, S4 I wish I still had it.

Boost leak, post turbo, probably as metal j pipes meet TBB pipe, unless yours have been welded.....if not possibly duff intercooler or pipe.

I wish mate its running like this on idle and no leaks.
Its like a valve opens, the dvs don't work or the n75 doesn't work positive deviation.
Then the fueling gets ramped up all in one fail swoop,.
Its some kind of problem on the vac system I think but cant understand it.
There must be a correlation between the fuel system and the vac system.
Could be the fuel pressure regulating getting the right vacuum signal.
So what controls the fuel pressure regulators vac signal?

When I know this the next question is whether there is a relationship between this vacuum and the dv,s, if and I expect there is they all are effected so it is this system which need figuring out.

Any one got any idea?


Is it safe to get it to mrc.

good point according to bentleys the vacuum reservoir has a leak detection pump and is connected to the dv recirc regulating valve, fpr is regulated by manifold pressure, waste gate is regulated by vacuum from distributor from y-pipe

there are check valves to F-hose from distributor and fuel breather valve.

it would be a good idea to look through the bentleys manual over the vacuum diagram its spaghetti and could be a leak anywhere through it, there are 2 main sources for vac, y-pipe and manifold, vac reservoir is supplied by manifold

Please could you mail me the diagrams I have the etka but they are so poor.
Thanks.

you have pm

thanks great diagram.
Today's Issues Part2
Car now settled in to full error.
Running like sh1t.
Rich as a sweaty arm pit on idle?
what could be the cause.
time will tell seeing Doug on Monday hope I am ok till then , G.

Thanks all involved

Good luck at MRC tomorrow Gordon - I'm sure they'll get you sorted

Thanks all, will post when I come out the other side.
G

UMM , ........ What about your SPARK PLUGS..... :

are you out the other side? any news ?