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[shyboy]

My Autel AL 319 reader gives me good info. on stored and pending codes and seems to give good live data also.
I haven't got a clue how to interpret a lot of this however., and hope someone can clarify a couple of things.
On Live data, I get a MAF reading at tickover, (varying between 645 and 675 rpm approx.), of .57lb/s. This doesn't change with increased throttle settings.Should this figure remain unchanged and is that reading normal? I haven't done a driving cycle with the reader attached because the cover can't be closed with the reader in its socket above the footwell and it wouldn't be safe.
There is a reading for Fuel 1 and Fuel 2, which I presume is because of the LPG set-up. Fuel 1 Reads 'clr' (? clear), but fuel 2 reads 'fault', presumably because it is identifying that the LPG system is currently not working. Am I right in this assumption, please?
Is there anywhere I can find a means of learning what all the other 'gobbledegook' readings mean?
Thanks.

[Marks DTM Calib]

so 250g/s which is huge (about 12 rings a bell!) plus it should change when revved

[omegod]

The fusebox cover removes quite easily Bill, been there and done it with a 2.2

[Andy H]

The V6 uses lambda sensors on bank 1 (drivers side) and bank 2 (passenger side) to adjust the fuel trims. The main engine ECU knows nothing about the LPG as there is no communication between the two ECUs.

Fuel 2 fault probably means that the long term  fuel trim is out of limits but it might mean that the lambda sensor is goosed on that side.

What fault codes are you getting?

Edit - don't trust anything a cheap code reader tells you......

[Kevin Wood]

If the MAF is misreading as badly as the live data suggests, I wouldn't be surprised to see fuel trim codes. The ECU is probably disregarding it and running on a limp-home strategy.

Probably best to sort the MAF before messing with anything else.

[omega2018]

.57lb/s seems either a little or massively high for MAF mine was at idle 0.46    lb/min

see my readings here
http://www.omegaowners.com/forum/index.php?topic=139765.msg1807500#msg1807500

and here
http://www.omegaowners.com/forum/index.php?topic=139765.msg1808746#msg1808746

[shyboy]

Thanks for the info.
Omegod.  I'll take the fuse box cover off but will be tempted to bin it if I can't sort things soon. 
Migmog.  I missed your saga but am now trying to absorb the details. Most of it is a foreign language but I'm trying to learn. Thanks for the pointers anyway.
Fuse 19. From what you say it sounds as if the MAF is goosed but the car's leaving for France on Saturday. Keeping my fingers crossed for my son and his family.

[shyboy]

Andy H. Sorry. I meant to say that I now have only the following Codes.
P0100  MAF?
P0150  O2 sensor
P0155  O2 sensor
I've got rid of the misfire codes mentioned in my other thread by changing the 2,4,6 bank coil pack. Car's running OK but still throwing up the above codes as 'pending'.
Sorry if this is all a bit vague. I really don't have the knowledge to make too many sensible deductions from what I'm seeing and it is a cheapo code reader.   
So far all the code readings have agreed with those obtained by the pedal trick.

[Doctor Gollum]

Unplug the maf. Does it run better?

If yes fit a new one. If no, plug it back in.

[TheBoy]

so 250g/s which is huge (about 12 rings a bell!) plus it should change when revved

You're thinking 12kg/hr, which is in right ballpark for a 4 port, 13-14kg/hr is about right for v6.



The ops 0.5lb/s is about 50,000kg/hr, clearly 'dangle berries'.

[shyboy]

Misfires (and associated codes) and rough idle have completely disappeared since coil pack changed and she's running nicely now so that must have been the main problem. (See note below).
Still have a static MAF reading of 256.75kg/s in metric which I gather is nonsense. I don't want to fiddle any more before it goes off to the continent as it's running well and I just hope it behaves. A new MAF is on the cards for when (if) it returns. 
Note for info. only.I had a devil of a job re-inserting the coil pack plug fully and ended up having to remove the plastic shroud surrounding it, and it then just slipped in as it should. I presume the shroud is intended to protect the plug as it is pushed (or pulled) into position and to prevent the retaining clip from coming adrift in use, but it definitely stopped the plug going fully home. The 1,3,5 bank shroud was already broken and therefore a loose fit round the plug body so presumably someone else had had the same problem.
I wonder if this was a contributory factor in the malfunctioning of the coil pack?

[omega2018]

my MAF is still working fine 3 months after i gently cleaned it by emptying a tin of contact cleaner on it.  i used WD40 brand "Fast Drying Contact Cleaner" (NOT WD40 oil) which "leaves no residue" http://www.ebay.co.uk/itm/191944717877 .

[shyboy]

Hi Migmog,
It looks as if I've got nothing to lose by doing what you did. When the car comes back from France ( 'always be optimistic' my old Mum used to say), in a fortnight, it will be a second, non-essential transport, so at the risk of incurring the wrath and ridicule of Jaime and other wise people on here I'll give it a go. I've accepted that it might have to be replaced anyway. Thanks again.

[Marks DTM Calib]

If the MAF was varying I would say give it a clean, its not so its a bit more fundamental!

As for running with the MAF as it is, its not a great idea for such a long journey and could result in costly CAT damage (its running on a default map and not closed loop) and much increased fuel costs (which would cover the cost of a MAF)

[Andy H]

If the MAF was varying I would say give it a clean, its not so its a bit more fundamental!

As for running with the MAF as it is, its not a great idea for such a long journey and could result in costly CAT damage (its running on a default map and not closed loop) and much increased fuel costs (which would cover the cost of a MAF)

The thing that makes me feel very uncomfortable about the MAF reading is that the number is ridiculously large - so large that I don't have any confidence that the code reader is even reading the correct sensor

If I was going on a long journey I would definitely want to try a different code reader or a known good MAF first to confirm that the code reader had found a real problem.

If the MAF is faulty then I wouldn't want to drive any distance without replacing it.