Member Since: 03 Jan 2016
Location: Cambridgeshire
Posts: 1263
V8 woes so a bit of help with analysis needed
On here in the V8 thread some will have seen our efforts to get M13DDM back on the road and largely this has gone well. Such is / was the confidence that Friday night after bleeding the brakes we thought lets chance a swift close of play MOT. It failed on emissions see photo
Some background now, the car 140k ex Copart had what appeared as seized engine. We could not turn with tommy bar, some WD40 and later diesel in the pots to soak for a few weeks and we thought it was a transplant with another engine. Stripping g/b to bench test revealed. Seizure was in probably / likely caused by disintegration of flexiplate on flywheel gumming up the teeth. Wired up with battery on first turn it fired
here is the problem: The lambda reading I get as a small blow on an exhaust coupling almost certainly is that issue but the pre-cat O2 sensors suggest so far out to have sparked fierce debate with the tester and our mechanic. Any thoughts on causes.
A. Cats non functional (dead)
B. O2 sensors faulty although they are reading
C. Catclean needed
D. Remnants of old petrol, WD40 and diesel not burned out
I favour D, tester thinks A & B, mechanic thinks (yes we should have changed O2 sensors) its a C before replacing sensors and cats as live data suggests the sensors are OK
Any other other options?D3 2.7 Zermatt silver (not another one)
D3 4.4 V8 Zambezi silver
D3 4.4 V8 Adriatic Blue
D3 2.7 (gone) Tonga Green
D3 4.4 V8 LHD Tonga Green
FFRR TDV8
Defender 300
5th Feb 2022 12:08 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10368
Ignore the 122 number I think. That’s a count down in seconds I think ?
The smaller font numbers don’t look too bad. ?
Fix the leak. These readers can’t get anything sensible with a leak
5th Feb 2022 1:28 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20732
Cats are not dead, CO figure would be a lot higher, but we can't rule out that they are not beginning to become less efficient given the mileage and possible WD/diesel contamination
HC's are also a little on the high side, indicating an incomplete burn, which would also contribute to high CO. Incomplete burn being a poor injector spray pattern, failing coil/plug/s, or poor compression. Been a while aince I've had a V8 plugged in, but I'm sure there is a cylinder misfire counter available
As the CO isn't *that* far out, I'd sort the exhaust leak, get some injector cleaner through it, and get it HOT before the emissions retest, before looking at replacement catsMy D3 Build Thread
Member Since: 04 Oct 2016
Location: Hampshire
Posts: 2444
As DM. First suspicion was contaminated cats but this should burn off
Typically when mine was tested LR suggested running a cleaner to help pass emission. Will see if I have any emission data in the "car file" once I get back home.
5th Feb 2022 1:58 pm
maxbasscat
Member Since: 03 Jan 2016
Location: Cambridgeshire
Posts: 1263
To me its the contamination. Irony is I cannot get through MOT to tax and insure and run on the road and there is only so much driving around the estate roads I can do. 5 mph limit! I have been very tempted to give it a blast on the Highway but I would get caught.
For now running Catclean through and hoping I can get MOT tester to give it a test run again. I am getting there.D3 2.7 Zermatt silver (not another one)
D3 4.4 V8 Zambezi silver
D3 4.4 V8 Adriatic Blue
D3 2.7 (gone) Tonga Green
D3 4.4 V8 LHD Tonga Green
FFRR TDV8
Defender 300
5th Feb 2022 4:38 pm
maxbasscat
Member Since: 03 Jan 2016
Location: Cambridgeshire
Posts: 1263
Fit Fangers…….I meant to add that 122 is the seconds countdown, I have now got some engine detox as I felt there might be some fouling and I would appreciate pjm 84 you sharing data. I am going to run the other V8’s to collect and analyse their dataD3 2.7 Zermatt silver (not another one)
D3 4.4 V8 Zambezi silver
D3 4.4 V8 Adriatic Blue
D3 2.7 (gone) Tonga Green
D3 4.4 V8 LHD Tonga Green
FFRR TDV8
Defender 300
5th Feb 2022 4:43 pm
pjm-84
Member Since: 04 Oct 2016
Location: Hampshire
Posts: 2444
Apologies, what I thought I had turned out to be for my VW rather than V8.
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