Rough running engine - Diagnostic help

ulfilias · #1 25th September 2013, 05:58 PM

Hi Guys,

The car is running rather rough :

Control Module Part Number: 4D0 907 559 C
Component and/or Version: 4.2L V8/5V G 0003
Software Coding: 10753
Work Shop Code: WSC 02314
Additional Info: WAUZZZ4DZ1N006219 AUZ7Z0Y1573840
7 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16685 - Cylinder 1 Misfire Detected
P0301 - 35-00 - -
16687 - Cylinder 3 Misfire Detected
P0303 - 35-00 - -
16686 - Cylinder 2 Misfire Detected
P0302 - 35-00 - -
16688 - Cylinder 4 Misfire Detected
P0304 - 35-00 - -
16725 - Camshaft Position Sensor (G40): Implausible Signal
P0341 - 35-10 - - - Intermittent
17549 - Load Calculation Cross Check: Implausible Value
P1141 - 35-00 - -

It's a D2 s8 4.2 2000 AVP engine....Any ideas where to start looking ?

Ta,
Lee

Goran · #2 25th September 2013, 07:35 PM

I'm no expert. Here are the relevant fault code tables and test procedures from ElsaWin.
Only other thing I can think of, set crank pulley to TDC, and check if the cam gears line up.

Dezzy · #3 26th September 2013, 07:45 AM

I've had very similar a few times now with the fuel pump causing missfires but on the other bank.
I'd be swapping some stuff over and see if you can move the misses to the other bank of cylenders, as soon as you do you'll find the part. Shaft postion sensor has to be up there on the list.

Have you had the CAT light flashing.

ulfilias · #4 14th October 2013, 11:04 AM

Hi There,

Replaced the G40 sensor and that error has gone away.

It's not the fuel system as the car has LPG. It runs slightly worse on LPG, which is actually common when you get a fault as it is less forgiving than petrol.

I expected it to be the coil pack on cylinder no.1 but i've just swapped 1 & 2 and there is no difference, if anything slightly worse, though takes 30 second to generate the missfires 1, 3, 4 (2 didn't even come up).

However the 1st code in the list is now

17549 - Load Calculation Cross Check: Implausible Value
P1141 - 35-00 - -

Any ideas ???

ulfilias · #5 15th October 2013, 04:01 PM

Still struggling here guys. I may grab some vac hose and replace that, though i'm not sure that is the actual problem!

Dezzy · #6 15th October 2013, 04:15 PM

I can't help, though all those missfires are on the same bank. Did you swap the amplifiers over just to see if you can move the missing to the other side?

The breather hose at the front you can check easily just give it a squeeze, mie was shot to bits and very nearly didn't return to round.