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[Diamond Black Geezer]

Where is the MAF sensor, on a 2.5TD?? I really hate asking such a simple question, but ive been all over the forum / under the bonnet, cant find anything that looks promising.

This is a development to a previous thread ( http://www.omegaowners.com/forum/YaBB.pl?num=1294909143 )  regarding a possible stuffed Autobox, I've been investigating other peoples threads with similar issues and it's possible a faulty MAF sensor could be causing the problems.



Incidentally the replaced/cleaned out selector switch underneath the car seemed to work like a dream, but now gearchange is as limpmode as ever!

Thanks as ever oofmen and oofwomen 

[aaronjb]

What year is your TD?

Early 2.5TD don't have a MAF, only a MAP sensor which is near the passenger suspension turret and is a small black cube about 1" on each side with one electrical connection and one vacuum connection - see here for a picture.

Later 2.5TDs had a MAF and a MAP - the MAF is located in the air pipe on the outlet side of the air filter box. You can't miss it, it's a big square thing in the ribbed pipe with an electrical connection. I think the MAF came in around '97/8?

[Diamond Black Geezer]

Many thanks!

It's a '98 R Reg. Im not 100% sure how the MAF could be causing a gearbox issue, but wont rubbish the idea, I have learned to keep an open mind with Omegas!!

[aaronjb]

MAF and MAP are used to calculate 'engine load' which is one of the components the gearbox will most likely use to calculate 'desired gear' along with road speed and engine RPM.

[Welung666]

It should have a MAF, try unplugging it and see if it improves any of your symptoms. Unplugging it drops it back to basic mode so it'll be a little flat up to about 2,500rpm but should pick up after that

[zirk]

My very first 2.5td had what I thought was a slipping / loss of power auto, wouldn't even climb a kerb head on from stand still, turned out to be the Maf.

[hoofing it]

What year is your TD?

Early 2.5TD don't have a MAF, only a MAP sensor which is near the passenger suspension turret and is a small black cube about 1" on each side with one electrical connection and one vacuum connection - see here for a picture.

Later 2.5TDs had a MAF and a MAP - the MAF is located in the air pipe on the outlet side of the air filter box. You can't miss it, it's a big square thing in the ribbed pipe with an electrical connection. I think the MAF came in around '97/8?

Is the map sensor on early td's not under the manifold behind the egr valve in the later one's the hole was blocked with a bolt :-/

[charlie]

I think the map is in the same place on all td's. The later ones with the bolt in replaces air intake temp sensor

[Pitchfork]

What year is your TD?

Early 2.5TD don't have a MAF, only a MAP sensor which is near the passenger suspension turret and is a small black cube about 1" on each side with one electrical connection and one vacuum connection - see here for a picture.

Later 2.5TDs had a MAF and a MAP - the MAF is located in the air pipe on the outlet side of the air filter box. You can't miss it, it's a big square thing in the ribbed pipe with an electrical connection. I think the MAF came in around [media]'97/8?[/[/media]quote]
My old October 1996 Traktor had a MAF on the airbox

[aaronjb]

My old October 1996 Traktor had a MAF on the airbox

Aha .. I was trying desperately to remember what year yours was when writing that post - I was convinced it was a '97, but apparently .. t'was not

Oh and Charlie is right - MAP sensor in the same place on all TDs, air temp sensor got deleted when the MAF came in (it does a similar job). The vac nipple for the MAP sensor is under the plenum a little ways behind the EGR valve, though.

[robg1984]

thanks for all the advice ive unplugged the maf tonight after i got home (travelling at about 45 down the motorway as gearbox warning was on and it didnt want to go nowhere in any gear!). Started her up and gearbox warning light had gone off took her for a spin and shes pulling fantastic!!!
Fingers crossed this is it sorted

[Diamond Black Geezer]

Looks like were on the lookout for more free car parts!!

This cars loads of hassle, but look on the bright side, it never actually cost you any money!!! 

[Diamond Black Geezer]

OK Update to this.

-A decent 2nd hand Gear selector switch has been fitted, which was cleaned out before fitting.
-The car ran beautiful for 24hrs, then rubbish again. On inspection It appeared the nylon bush was slightly out, so using a tiny allen key this was aligned, but to no avail. It was only out by a fraction anyway.
-Also the selector lever was tweaked in length, just to make sure all was 'as far back as it will go' when in P.

-The MAF has been unplugged, as has the MAP sensor. Again, this seemed to work, but later in the afternoon the car started running like an asthmatic sloth again.

All my instincts are telling me its still MAF/MAP/Selector switch related, but all the evidence seems to be saying 'replace the gearbox'. I'm really not keen on doing this until all avenues have been fully explored.

Could we have missed anything / done something wrong!!?

This is getting ridiculous now, me and my mate are still defrosting after a whole afternoon wasted. I just get the impression its something ridiculously simple, or that we've done wrong.

Thanks in advance! 

[Welung666]

Any codes stored?

[Diamond Black Geezer]

Tried the old paperclip test almost immediately after buying the car, and its one of them TDs you cant paperclip. Grrr!

That said will be able to give you a full list, as my mate has a code reader in the post, so he'll be posting these tomorrow.

Ta.