02Pilot has been clamped for tomorrow's run... something about the fact that the vacuum is positioned right at the front of the engine makes me think it's going to affect Bank 1 more, but I suppose we'll see once the adaptations dial back in.
I never understood the additive/multiplicative stuff. What are the fuel trims as % when you use a standard obd2 scanner?OEM Siemens/VDO MAF (2nd hand - not sure of usage)
both brand new Bosch pre-cat lambdas
two ICVs tried,
no vacuum leaks - 1000% positive,
injectors pulled, cleaned, and checked for spray
02Pilot mod (last 1700 miles)
Had a lean code come up for Bank 1 today so I did a test-drive with INPA and got the following at idle, fully warmed up, no aircon:
View attachment 979774
View attachment 979775
Two things I noted:
First thing I will do is clamp off the 02Pilot mod and reset the trims for another run.
- I've read in more than one place that the idle air consumption for this engine should be around 12.5 kg/h or 3.5 g/s; mine is 8.75 kg/h (2.5 g/s). Does this seem a bit low? I can't find any data on what it should be. Mine scales linearly with rpm, I should add.
- the idle speed of 700 is, I've read (again), a bit high. Can anybody corroborate?
It's the code that concerns me - it's been on E10 for a couple of years and never chucked a code before.I never understood the additive/multiplicative stuff. What are the fuel trims as % when you use a standard obd2 scanner?
A lean condition on one bank is very unlikely to be the MAF. On E10 petrol, the car will run about 5% lean, then add to that a 5% tolerance, you could have up to 10% trim without having any real issues.
It shouldn’t, but using E10 will move the “normal range” up 5%. So even if you’re in this range you can throw a code.It's the code that concerns me - it's been on E10 for a couple of years and never chucked a code before.
I'll check with OBD tomorrow when I get home - it will need a few miles on the reset trims before it settles down.It shouldn’t, but using E10 will move the “normal range” up 5%. So even if you’re in this range you can throw a code.
I’m not sure what the exact total % is required for it to set a code. What are the obd fuel trim %s?
MAF is under reporting which caused lean code.Thanks - I can rule the MAF out
Not conclusive proof of a bad MAF.MAF should be around 3.5 g/s at hot idle of 700 RPM.
I tested the airflow at various rpms, and it scaled perfectly linearly - doubled at ~1500, trebled at ~2000.Not conclusive proof of a bad MAF.
Say there’s a vacuum leak of 1g/s, engine gets the required 3.5 for idle, but only 2.5 passes and is measured by the MAF.
Cheapest would probably be from Autodoc. What's wrong with ordering from Germany? In a rush?Does anybody know of a good UK-based OEM supplier for these MAFs? All the ".co.uk" sites I can find them on are based in Germany.
Just ordered from Autodoc - would have prefered UK, but of F**KING COURSE there's a bank holiday on Monday, which would scupper any UK delivery anyway!Cheapest would probably be from Autodoc. What's wrong with ordering from Germany? In a rush?
Yep - and just installed a brand new (non-OEM, but doesn't matter) fuel pump, and nothing changed.Did you check fuel pressure?
It had identical trims on the old pump; the new one hasn't changed anything.Non-OEM could matter. Not sure why people state that it doesn't.
did you test fuel pressure afterwards?
Ok. Looks like you have it under controlIt had identical trims on the old pump; the new one hasn't changed anything.