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[cap]

Hi everyone, I thought at last I had bought a car that was gonna be a winner £250.00 I paid with no tax or ticket.  I had looked on this site and everyone seemed really happy with their Omegas.

Trouble started with EM light coming on at 2am then in the morning it would not start, now it sometimes starts and then cuts out after a while coughing and spluttering first. It seems to be misfiring and smoking quite a lot when it does run, at high revs (over 4000) it seems to be okish  but I can't / daren't drive it on the road as it won't last long enough running to get to the end of the road.

? Wrong signal from immobiliser
?73? MAF something to do with high voltage ?
?74? MAF something to do with low voltage ?

There were only 3 errors, the mechanic then cleared the memory but he did assure me that they meant nothing really before he cleared them, fortunately I have quite a good memory for this.

I have put a new fuel filter in today and tried a second hand crank sensor from the scrap yard and it was exactly the same result.

I have a couple of little pipes off at the rear of the bulk head do not know where they go to, they must have been on before, a piccy would be nice to see where to put them.  One is next to the air intake for the top 4 pipes.

please help.

[TheBoy]

the immobiliser one can be ignored, assuming your EML isn't flashing.

MAF ones sound odd, to have both errors, but would never condone a v6 MAF without getting live data reading from it.  Where are you - might be worth filling out general location on your profile

[feeutfo]

your post implys you had a mechanic read the codes. Are you aware the omega will flash out engine codes for you for free? See the link,
http://www.omegaowners.com/forum/YaBB.pl?num=1189022687
Should help diagnose. But as said, mafs rarely fail on the non drive by wire v engines. So dont run out and by a maf purely on the basis of any old maf code, there a several related and not all mean failure, crank sensors can throw them but you dont have a cs 19 fault code.

Wonder if its worth checking the connector plug to maf?

[deviator]

If you had both MAF codes, I would say someone has started it up with the MAF disconnected. In which after clearing codes, they shouldn't come back.

As suggested above, the paperclip test will confirm.

[cap]

Thanks for replying so quickly guys, i just got the paper clip results.  The Engine management Light is not flashing and the immobiliser fault has gone from the list so i wouldn't suspect that as the mec did clear the memory is the MAF now broken,all connectors plugs have been removed, inspected and cleaned, they looked good anyway.

The numbers are as follows, using a paper clip
12
12
74 Mass Air Flow Sensor Voltage High
74
74
73 Mass Air Flow Sensor Voltage Low
73
73
48 low battery voltage (a new battery fitted)
48
48
31 no rpm (i didn't start it up)
31
31
12
12
12
loop

I looked at the list you suggested chris and again it looks like the faults have reoccured trippled. can i clear the memory or do i need a tech2 or a new MAF sensor.

Thanks again, chris.

[feeutfo]

as The Boy suggests it really needs tech 2 with one of the guys on here and live data examined. There is only so much you can do from a key board. Pita i know as you cant drive it in that state. If your near Mark dtm in Nottingham or The Boy i would ask one of them very nicely to come not to you but they are very busy guys.

In the mean time, in the vaine hope of finding your fault....
has the car been run with the maf disconnected and did it make a difference? Ie run better? If not may be worth a try.
Battery voltage, with a new battery, would suggest checking all connectors are tight and the crimped  cables to the battery electrode clamps are also tightly held and not loose or getting hot. Check braided earth cables are well connected and tight no corrosion that would cause a bad connection.
Any wiring faults that may relate to both codes? They do seem related as both codes come up in pairs, from your list. Its a strange one as said. Hope that helps, but i suspect it will not be resolved until you get tech2 on it with an operator that knows how to use it correctly. Which rules out dealers straight away. As said, if no joy, contact The Boy or Marks dtm calib. Best of luck.

Ps your small pipes at the back of the engine sound like vac pipes and need connecting up correctly. But these would not cause the issues your having.

[dbug]

Check maf plugs - try contact cleaner and refit.

[cap]

You guys ROCK !!!

I disconnected the MAF sensor (the square one on the air tube) and the car runs for ever with no worries but once reconnected I get about 200yds and it coughs, splutters and then stops.

I'll get a new one i think, fit it and then give you results as soon as, but in the mean time will it cause any damage running without it ?

You have saved me a fortune I am sure.

Thanks again and again and again.

[feeutfo]

easy tiger, mafs rarely fail on pre face lift v6. And afaik they aint cheap either. Suggest either get one from a breakers on here or swap with a known good one with a member on here thats near you to confirm. Mutant cav or Markey Mark usually have a supply of spares. But dont discount the wiring to and from. I would hate for you to go out and buy a new maf and find its the same. I beleive the ecu reverts to a default map if the  maf is not present or open circuit so dont think it will do any harm to run unplugged, but will still not run correctly.

[cap]

I ran it for a while today with the MAFS disconnected but drove really easily and it seems ok.  The fuel consumption is about the same as before according to the computer (average 18.5mpg local).  I am going to do a 20 mile each way work jouney tomorrow and am really nervous, but needs must.

[cap]

It works quite well but uses oil and I can't find time to even open the bonnet at the moment.  26mpg travelling 27 miles taking it easy between 50 and 60 mph, not putting my foot down to accellerate hard.  I have done over 300 miles with the MAF disconnected totally.  I'm a bit nervous still because there is a little smoke coming out the back but that must be because the MAF ain't on !  Thanks for your super advise, my new job is great too !

If anyone knows any reason why I should not continue to drive the car in this state (bearing in mind I'm driving carefully) please post a reply, if nothing else is posted I will continue to drive it.

Thanks again everyone, I'll post again when I get another look at it.

[NiallyV6CDX]

Without the MAF plugged in the engine is just in safe mode so performance / fuel economy will not be optimum. It's probably running a bit rich hence some smoke and slightly thirsty fuel consumption. I don't suppose those pipe coming out of the bulkhead are your crankcase breather hoses?
Probably best to get the MAF issue sorted ASAP as you may contaminate the cats and the lambda sensors with soot, which will cause further running issues.

[cap]

Yep, it's running still with no MAF 3000 miles later it's not causing too much of a problem but like you say it's a bit thirsty, 56 miles and it costs a tenner.  I got a MAF from ebay and it had the wrong connector on it mine is a round plug but the one I got had a square plug so no luck yet, i should just buy a new £38.00 one and have done with it now.  The pipes are an unknown quantity to me I really have no idea where they go, there is one at the front of the engine that looks like it has a vacuum on it (is this the auto choke) and the one at the rear of the engine i have no idea where that should go, I keep trying to pull up other omega drivers when I see one but they are few and far between now and even the Vauxhall garage here don't have a clue.

Just want to say thanks again for all the help this site and it's members have given me, I would defo recommend anyone to come here for a friendly and helpful experience.  I will post again when I eventually get this sorted to give you guys the new fuel economy and any news and pictures of where the damn pipes go, lol.

Traaa a bit !