Thread: D2, V8 non starting event with odd error codes and IACV replacement or repair.

Originally Posted by clubagreenie

In instrument mode:

Air Load - 0.00 (0.62)

Idle Air - 1.09 (101.03) ** Is your figure right? If so, it could indicate a bad air leak somewhere. Could also be a throttle problem, TPS perhaps. This could explain the whole issue **

Idle Load Air - 0.09 (0.00)

In Nanocom, Motronic, live data.

MAF Sensor - 20 (19)
Idle Air - 97 (103.03)
IACV Drive - 43 (39)
Idle Load Air - 0.15 (0.00)
Average Trim Bank A - 0.99 (1.00)
Average Trim Bank B - 0.99 (1.00)
Load Air - 0.00 (0.18)
Fuel Trim A - 1.00 (much the same, quick, slight fluctuations)
Fuel Trim B - 1.00 (as above)
Idle Trim A - 0.04 (0.01)
Idle Trim B -0.17 (0.01)
Multi Trim A - 1.00 (1.00)
Multi Trim B - 1.10 (1.00)
Secondary Air - Active (yes)
Adaptive Purge - 52.08 (64)
Leak Rate - 0.68 (0.14)
Loop - Open (closed)
Evap - Active (yes)

O2 Sensor A - 0.00 B 0.00 (A&B - Max is around 0.75, min around 0.15 - very fast fluctuations) ** This is not normal. Again, mine showed very low and odd figures when I had an air leak. Failing that, you are probably on the right track with wiring issue **

Shunt Voltage - 0.11 (same)
O2 Heater Resistance - Ready (yes)
Heater Status - on (yes)

Downstream O2 Sensor Shunt Voltage - 0.99/4.79 ***value alternates*** also nil downstream O2 sensors. (Same, as you say -no downstream sensor anyway)

Upstream O2 Sensor Shunt Voltage - 1.00/4.79 ***value alternates***
Upstream Lambda A output - 1.00/4.79
Upstream Lambda B output - ready (doesnt say ready, constant changes)
Heater Status - on/off (alternating)

So if anyone knows what these values should be, or has half (or even a full clue) as to whats going on all help appreciated.

My figures in brackets.
Hope this helps mate, let me know how it goes!

Huge thanks for that.

Starting to think that the non starting issue is an independent event.

With the alarm faults, P01668 and random M&S lights flashing (unrelated to voltage as it's well and truly turning over). Playing with the alarm settings, turning off or on the immobiliser, alarm itself etc I can manage to get it going (eventually). I'm starting to think it's the BCU or immobiliser stopping the spark somewhere.

Does anyone know of what circumstances trigger the M&S lights apart from voltage? The WXYZ switch was new approx 12 months ago with the gearbox.

No worries at all.

My money is on the TPS.
I have read of others experiencing M&S lights with faulty TPS, it also fits with some of your other symptoms. (very low idle air)

The Nanocom will read faults etc on the gearbox too, worth a check if you haven't already.

Already swapped the TPS with the IACV.

Thinking now maybe the CKP (crank angle) sensor, as it's doing a classic CKP thing and starting cold/cooled down enough and not hot starting when it's had enough.

The IACV, can you look in yours and see what happens when powered up (unplug and ign on, plug in) the "valve" inside sort of "wobbles" but never really moves into a different position from off.

Yeah mine just wobbles too, I doubt you would see it functioning properly unless it was in place and running. (and you had x-ray vision)

Got a used but known CKP on the way so see what happens...

Dont delay!
Those Crank Angle Sensors are a show stopper,,,

Originally Posted by ashhhhh

No worries at all.

My money is on the TPS.
I have read of others experiencing M&S lights with faulty TPS, it also fits with some of your other symptoms. (very low idle air)

The Nanocom will read faults etc on the gearbox too, worth a check if you haven't already.

Its a great pity Armidale is so far away
What gearbox faults does it read ashhhh ?
sticky solinoids ?