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[Ratty]

The engine started misfiring tonight, then the EML came on, then it died. Starts again okay, revs okay too, put it in drive and it dies, about 4 or 5 times trying this it eventualy goes then does that all over again within a few yards.

After a few episodes of this there is a very strong smell of petrol and a sulphury smell like bad Cats.

Managed to get home, when it is running there' seems to be plenty of power till it misfires then goes through the above troubles all over again.

Any ideas lads please?

[RobG]

Codes??

[dbug]

As said post fault codes (paper clip it)

Also try it with MAF disconnected

[Ratty]

Cheers lads, sort of knew that was going to be the reply, only just managed to get home with it an hour ago, i'll check the codes in the morning.

I was just putting out the feelers for ideas what it might be, I guess from what I've said it'll be a needle and haystack job atm

[Ratty]

Haven't got the codes yet, but did disconnect the MAF and it now runs, albeit a bit hesitant on pulling away from stationary, the smell is still pretty foul, will this clear in time? or have I knackered the cats as well?

Thanks

[Johnny English]

If an injector went rubbish (peeing) the phenomenon would be similar to this, I'd also check whether there is fuel loss. Cat could give failure message if I know well.

[TheBoy]

Its 2 mins to read the codes.

Unfortunately, pulling the MAF will have stored extra codes, which will now confuse the issue  - this is why we encourage members to gather as much diags as possibly before "guessing". Now, it needs to go on a proper code reader with live data capability to see if the MAF is knackered.


Before condemming the cats, see what the idle and partial load trims are on it, in case the MAF has pushed them to ultra rich/lean. Again, needs a code reader with live data capability.

[Ratty]

I knew I'd do the wrong thing. I actually disconnected the MAF on advice from above, not passing the buck, he did mention the codes before the MAF.  I didn't even think about the MAF till it was mentioned here though.

It did seem to work though and the smell is definitely getting better, I just did a 2 mile run and it is much better than it was last night.


Thanks

[TheBoy]

I knew I'd do the wrong thing. I actually disconnected the MAF on advice from above, not passing the buck, he did mention the codes before the MAF.  I didn't even think about the MAF till it was mentioned here though.

It did seem to work though and the smell is definitely getting better, I just did a 2 mile run and it is much better than it was last night.


Thanks

No problem - just trying to get across the correct procedure

The fact its improving, I think you may be on the right lines...  ...but we need to speed the process up.

OK, now disconnect the battery for a couple of hours.  **NOTE - you will have to re-enter codes into radio and CD Changer, and reset windows and sunroof**

This will NOT clear fault codes, but does tend to reset trims to their initial state.

[Ratty]

I've sort of jumped the gun again me thinks, put it on a friends *cough*"My Naff Code Reader"*cough*

it came up with

73   Mass Air Flow Sensor Voltage Low
74   Mass Air Flow Sensor Voltage High

No other codes in the entire system.

[TheBoy]

The codes are to be expected.

Look at live data on the engine ecu, looking for idle BLM and partial load BLM (for both banks). What are they? Ideally want around 115 to 140.  Reset them if not at this value.


Then plug MAF back in, and take readings for Mass Airflow

[Ratty]

I've taken a couple of readings, tbh they go right over my head, can I attach them for you to look at?

Cheers TB

[TheBoy]

I've taken a couple of readings, tbh they go right over my head, can I attach them for you to look at?

Cheers TB

Feel free

[Ratty]

Thought I could attach them here, seems I can't so I've dropboxed them...

I only had use of the reader for a very short time, and it was before you posted the last instructions, but hopefully there's enough info there to help

http://dl.dropbox.com/u/6230572/Faultcodes_1999%20(X)_Omega-B_Engine__X%2025%20XE_201301051025.txt

http://dl.dropbox.com/u/6230572/1999%20(X)_Omega-B_Engine__X%2025%20XE_20130105103004.csv

http://dl.dropbox.com/u/6230572/Livedata_1999%20(X)_Omega-B_Engine__X%2025%20XE_201301051024.csv

http://dl.dropbox.com/u/6230572/Livedata_1999%20(X)_Omega-B_Engine__X%2025%20XE_201301051028.csv


Thanks TB, appreciate the help.

[TheBoy]

Yeah, reset the BLMs. They are 'dangle berries'.

I'd try by disconnecting battery overnight, as that code reader I wouldn't trust to make any settings.