audia82013

hello newbie here hope you can help

i have a 2004 audi a8 4.2 v8

basically i was driving the other day and my engine management light came on and the esp light came on after, and the car started to misfire jerk and just switched it self off.

i tried starting it on 2 occasions. on both occasions it dosent start straight away it just ticks then i give it some gas and then it starts, once started it misfires like mad, then when left to idle for 1min will cut out.

here are the codes collected from vcds

7 Faults Found:
17981 - Left Engine Mount Solenoid Valve (N144): Open Circuit
P1573 - 004 - No Signal/Communication
16420 - Oxygen (Lambda) Sensor B1 S2: Heating Circuit: Malfunction / Open Circuit
P0036 - 004 - No Signal/Communication
17983 - Right Engine Mount Solenoid Valve (N145): Short to Plus
P1575 - 001 - Upper Limit Exceeded
18282 - Valve for Torque Support Mount: Short to Plus
P1874 - 001 - Upper Limit Exceeded
17522 - Oxygen (Lambda) Sensor; B1 S2: Internal Resistance too High
P1114 - 004 - No Signal/Communication
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 001 - Upper Limit Exceeded
16692 - Cylinder 8: Misfire Detected
P0308 - 001 - Upper Limit Exceeded
Readiness: 0110 1101


could someone advise me what is causing the engine to cut out?

thank you very much

tjf

I just had a similar scenario this weekend. MIL light came on, then ESP a few minutes later. My codes are different and the car runs good, but it was very rough upon starting this AM. I had just changed the oil prior to this happening.

Address 01: Engine Labels: 077-910-560-BFM.lbl
Control Module Part Number: 4E0 910 560 J HW: 4E0 907 560
Component and/or Version: 4.2L V8/5V G 0010
Software Coding: 0007773
Work Shop Code: WSC 02313 785 00200
VCID: 2854EEA89BCF805EFC3-807D
6 Faults Found:

17538 - Fuel Trim; Bank 2 (Mult)
P1130 - 001 - System too Lean
16558 - Fuel Trim; Bank 2
P0174 - 001 - System Too Lean - MIL ON
17536 - Fuel Trim; Bank 1 (Mult)
P1128 - 001 - System too Lean
16555 - Fuel Trim; Bank 1
P0171 - 001 - System Too Lean - MIL ON
16485 - Mass Air Flow Sensor (G70)
P0101 - 004 - Implausible Signal
18061 - Please check DTC Memory of ABS Controller
P1653 - 008 -

Readiness: 0000 0100
================================================== ======

Address 02: Auto Trans Labels: 09E-927-156.lbl
Control Module Part Number: 4E0 910 156 S HW: 09E 927 156 A
Component and/or Version: AG6 09E 4,2L5V USA 0020
Software Coding: 0000002
Work Shop Code: WSC 02313 785 00200
VCID: 32600CC0AD13FA8E527-8067
1 Fault Found:

18265 - Load Signal
P1857 - 000 - Error Message from ECU - Intermittent
Freeze Frame:
Fault Status: 00110000
Fault Priority: 0
Fault Frequency: 2
Reset counter: 40
Mileage: 135813 km
Time Indication: 0
Date: 2013.11.16
Time: 16:20:02

Freeze Frame:
RPM: 1472 /min
RPM: 1440 /min
RPM: 1248 /min
(no units): 36.0
(no units): 42.0
Temperature: 72.0°C
T.B. Angle: 9.8°


----------------------------------------------------------------------------


Address 03: ABS Brakes Labels: 4E0-910-517.lbl
Control Module Part Number: 4E0 910 517 B HW: 4E0 614 517 BC
Component and/or Version: ESP 5.7 allrad H44 0510
Software Coding: 0007597
Work Shop Code: WSC 02313 000 00000
VCID: 2240FC80FDF36A0EA27-8077
1 Fault Found:

18265 - Load Signal
P1857 - 000 - Error Message from ECU

MP4.2+6.0

you might look at the vacuum hose connections, plus the plug in connector at the MAF. You have codes suggesting one or both as possible issues.

MP4.2+6.0

First, all the codes are persistent (upper limited exceeded). Thus at least some have been around quite a while.

As guesses, I might look at the valve timing connectors and position sensor (up at the cylinder heads), the crankshaft position sensor and the fuel pump set up. I haven't had to deal w/ any of these on a 4.2, but the descriptions and codes would suggest those as general possibles. You might actually want to clear all codes and then read it again after some brief running to get it down to the current stuff. Also look at the MAF connector like with my other reply.

All of your motor mounts show some kind of an issue, but that's unrelated.

tjf

Car ran really rough again when starting up after work. Went over everything and could not find and loose vac lines. Unplugged and replugged MAF. Same thing. It runs really rough when first starting then it smooths out. When it runs rough, I can hear the PVC(?) valve cycling like crazy. I can also hear a slight hum as it is sucking air through the small vent in the top.
I also noticed the timing bouncing around quite a bit in the measuring blocks. Is the secondary motor supposed to be running? I disconnected both lines while the engine was running but did not feel anything from the motor.
I then unplugged the MAF and started the car. No PVC cycling, but it was still sucking air.
These are the codes I pulled this time. Too rich and random misfires.



Address 01: Engine Labels: 077-910-560-BFM.lbl
Control Module Part Number: 4E0 910 560 J HW: 4E0 907 560
Component and/or Version: 4.2L V8/5V G 0010
Software Coding: 0007773
Work Shop Code: WSC 02313 785 00200
VCID: 2854EEA89BCF805EFC3-807D
12 Faults Found:

16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 001 - - MIL ON
16689 - Cylinder 5
P0305 - 001 - Misfire Detected - MIL ON
16692 - Cylinder 8
P0308 - 008 - Misfire Detected - MIL ON
16690 - Cylinder 6
P0306 - 008 - Misfire Detected - MIL ON
17535 - Fuel Trim; Bank 1 (Mult)
P1127 - 002 - System too Rich
17537 - Fuel Trim; Bank 2 (Mult)
P1129 - 002 - System too Rich
16556 - Fuel Trim; Bank 1
P0172 - 002 - System Too Rich - MIL ON
16559 - Fuel Trim; Bank 2
P0175 - 002 - System Too Rich - MIL ON
16485 - Mass Air Flow Sensor (G70)
P0101 - 004 - Implausible Signal - Intermittent
18061 - Please check DTC Memory of ABS Controller
P1653 - 008 - - Intermittent
16688 - Cylinder 4
P0304 - 008 - Misfire Detected - MIL ON
16685 - Cylinder 1
P0301 - 008 - Misfire Detected

Readiness: N/A


Tom

MP4.2+6.0

You are referring to the EGR valve cycling, but I wonder if you really mean the PCV valve. (I'm drawing on my C5 4.2 knowledge here, since my D3 is a W12). The EGR valves should be at the back of the heads, with a metal transfer pipe that probably runs between them. Those valves are made of metal given the heat. The PCV valve is a big bunch of plastic. It should sit high up and have a couple of oil vapor looking rubber hoses attached (which they are). On PCV, maybe try just opening oil cap briefly on one hunch. But, I suspect the noise you may be hearing if it is PCV have may just be a symptom of rough engine run and lots of vacuum fluctuations, not the cause.

Do look at EGR system more. If it is sucking exhaust gas in volume near idle, that will choke most any motor. If it's like my C5 4.2, it is also where the secondary air pump (aka a "smog pump" in the old days) pumps in extra air to jump start the catalyst light off, coupled with extra fuel. That air should come in via a rubber line from the pump (about the diameter of a decent sized car heater hose), likely into that transfer pipe between the EGR valves, if again it's like my C5 and I remember it right. Something wrong with either the switching of that system or with that rubber hose connection could fit your scenarios.

Bad MAF remains another, though if it is also running very badly in open loop (without the sensor plugged in), that suggests to me it is elsewhere since if it were the MAF sensor I would expect improvement with it unplugged. The timing and misfire issues I'm not sure about from afar, beyond just guesses they could be symptoms of the other issues, or a basic problem with the ECU or something. If I read you correctly as saying it is a cold/warm up related problem (rather than once it has warmed up), I would continue focus on the secondary air pump system and connections for now.

tjf

Sorry, yes I meant the PCV valve. The 3" diameter x 1" thick valve on the top, back of the motor. I thought about it during the night and edited the post this AM. I actually thought it was the secondary air injection valve, as the Bentley is a little vague about it in the diagrams. I was talking to an Audi tech though last night and he stated it was the crankcase vent valve. He thought I should start with that, as they tend to develop cracks in the diaphragm.
....When I unplugged MAF the car ran much smoother, but I could still hear air sucking through one of the ports on top. That is definitely not normal.

mishar

It could be Secondary Air Pump since the problem came just after oil change. Check connections under the air box.

tjf

I did that. I even pulled the whole airbox back out to make sure that the line didn't have a crack in it somewhere. I'm pretty confident on that the valve is the problem as it's sucking air through the valve. $91 confident anyway. Most expensive pvc valve I ever bought.
BTW - Carson Heter is back in the Audi Parts business. Really good prices, as far as geuine Audi parts go anyway.
http://forums.quattroworld.com/a4/msgs/118898.phtml

mishar

Not really all that good prices. This guys are better.