Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: bighed on 16 November 2008, 14:31:26

Title: Code 73 & 74
Post by: bighed on 16 November 2008, 14:31:26
well fully fixed misfiring problems with new parts off markey mark (Top fella indeed  :y) Just done paperclip test out of curiosity and its come up with codes 73 & 74. Mass air flow meter voltage low AND high  :o How does this work?? Surely it cant be both??  :-/
Oh and whilst putting scuttle back on we noticed the material padding underneath was full to the brim of water. Maybe that was dripping onto coil pack as it had been in there a long time cos when we squeezed some out it was brown  :-?
Title: Re: Code 73 & 74
Post by: TheBoy on 16 November 2008, 17:15:57
petrol mafs rarely fail unless you've fitted a chav filter, where the oil contaminates it.

Usual cause is an airleak somewhere - air intake, vac leak, egr etc...

Often get a false maf fault when you get a 19...
Title: Re: Code 73 & 74
Post by: bighed on 16 November 2008, 17:32:04
just been for a decent drive and tested again with engine turned off, Codes 73,74 and 19. But no 31. Should I not get a 31 with engine off???  :-/

Oh and no chav filter.   ;D :y
Title: Re: Code 73 & 74
Post by: TheBoy on 16 November 2008, 17:47:44
Quote
just been for a decent drive and tested again with engine turned off, Codes 73,74 and 19. But no 31. Should I not get a 31 with engine off???  :-/

Oh and no chav filter.   ;D :y
as said earlier, the crank sensor can through an erroneous maf fault.  Replace crank sensor (its buggered).


If you have a 19, you won't get the 31
Title: Re: Code 73 & 74
Post by: bighed on 16 November 2008, 17:51:09
where abouts is this and what effects can it have on the car TB?? :y
Title: Re: Code 73 & 74
Post by: TheBoy on 16 November 2008, 17:52:44
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where abouts is this and what effects can it have on the car TB?? :y
Sure there is a guide in maintenence guide.

Ultimate symptom is having your car delivered to garage on AA truck
Title: Re: Code 73 & 74
Post by: bighed on 16 November 2008, 17:56:50
Quote
Quote
where abouts is this and what effects can it have on the car TB?? :y
Ultimate symptom is having your car delivered to garage on AA truck

is it that bad?  :'(
Title: Re: Code 73 & 74
Post by: Welung666 on 16 November 2008, 18:01:24
Yep! If the crank sensor gives out the car will to, best to get it fixed before it comes to that.
Title: Re: Code 73 & 74
Post by: TheBoy on 16 November 2008, 18:04:20
Quote
Quote
Quote
where abouts is this and what effects can it have on the car TB?? :y
Ultimate symptom is having your car delivered to garage on AA truck

is it that bad?  :'(
Depends where you are. If you're outside your house, not too bad.  If you're 5 miles outside Dijon, well, thats 'inconvenient'  :-[
Title: Re: Code 73 & 74
Post by: Welung666 on 16 November 2008, 18:07:28
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Depends where you are. If you're outside your house, not too bad.  If you're 5 miles outside Dijon, well, thats 'inconvenient'  :-[

 ;D ;D ;D
Title: Re: Code 73 & 74
Post by: bighed on 16 November 2008, 18:17:43
so..... If the crank sensor does give in the car will just cut out and not fire up then. can cope with that as long as it doesnt implode or anything!!!  :y
Title: Re: Code 73 & 74
Post by: bighed on 16 November 2008, 18:31:28
As above.  :y also has anyone got a crank sensor for sale?  ::)  :-/
Title: Re: Code 73 & 74
Post by: TheBoy on 16 November 2008, 18:37:53
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As above.  :y also has anyone got a crank sensor for sale?  ::)  :-/
buy new
Title: Re: Code 73 & 74
Post by: bighed on 16 November 2008, 18:40:07
right ok thanks  :y
Title: Re: Code 73 & 74
Post by: bighed on 16 November 2008, 18:45:00
is there only 1 sort of crank sensor or do they all differ?? as long as its for a 2.5 V6?? :-/

just found one on fleabay. Vauxhall part number 90492006. :-/has any one got a pic of where crank sensor plugs into on top part of engine please??

the one on fleabay also has a heat shield round it so that would help with it touching hot pipes etc wouldnt it
Title: Re: Code 73 & 74
Post by: TheBoy on 16 November 2008, 18:50:28
varies, check the plug on yours
Title: Re: Code 73 & 74
Post by: bighed on 16 November 2008, 18:57:37
where is it on top part of engine? seen it on how to but only from underneath  :y
Title: Re: Code 73 & 74
Post by: TheBoy on 16 November 2008, 20:30:59
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where is it on top part of engine? seen it on how to but only from underneath  :y
back of babk 2/4/6
Title: Re: Code 73 & 74
Post by: bighed on 16 November 2008, 21:33:28
Thats great! And where would the number be i have to check. Is there any pics of cam sensor from top??  :y
Title: Re: Code 73 & 74
Post by: TheBoy on 17 November 2008, 10:22:05
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Thats great! And where would the number be i have to check. Is there any pics of cam sensor from top??  :y
Check the maint guide - the connector can either be more oval or more square.
Title: Re: Code 73 & 74
Post by: Richard A on 17 November 2008, 10:45:11
When the crank sensor failed on my 2.5 I cut the connector off and took it to the dealer to make sure I got the correct replacement.
It is impossible to route the replacement as the factory fitted one, not a problem just keep the cable from anything hot or cold.

regards
richard a
Title: Re: Code 73 & 74
Post by: TheBoy on 17 November 2008, 10:55:49
Quote
When the crank sensor failed on my 2.5 I cut the connector off and took it to the dealer to make sure I got the correct replacement.
It is impossible to route the replacement as the factory fitted one, not a problem just keep the cable from anything hot or cold.

regards
richard a
Not entirely true ::) - I spent hours, and I mean hours, doing it.  It was only a few months after than I learnt there was a better way ;D
Title: Re: Code 73 & 74
Post by: bighed on 17 November 2008, 14:07:09
hi TB, when u say in how to, to check the plug thats the bit on the top part of the engine isnt it? :y
Title: Re: Code 73 & 74
Post by: TheBoy on 17 November 2008, 14:51:12
yes
Title: Re: Code 73 & 74
Post by: MutantCav on 17 November 2008, 17:29:12
Only one crank sensor for v6 in general...however 2 different types of connector as per normal Vaux thinking...an oval connector and a square one...make sure you get the same connector...

It plugs in down at the bottom of the engine passengers side towards the back by the oil filter...and runs up to a plug the other end which you can find near the back of the plenum
Title: Re: Code 73 & 74
Post by: bighed on 17 November 2008, 18:23:49
 :y :y :y :y :y :y :y :y Thanks both
Title: Re: Code 73 & 74
Post by: bighed on 17 November 2008, 22:31:22
 :-/ :-/ :-/ :-/ :-/ :-/  Really confused now. Just been and paperclipped her again after a decent drive and only got code 31?? :-/ :-/ :-/ :-/ :-/ :-/
Title: Re: Code 73 & 74
Post by: bighed on 18 November 2008, 11:53:36
any ideas  :-/
Title: Re: Code 73 & 74
Post by: markey mark on 18 November 2008, 13:47:35
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any ideas  :-/

leave it then and check it again in a few weeks  :y
Title: Re: Code 73 & 74
Post by: bighed on 18 November 2008, 21:31:12
thats what Im thinkin..... Thanks to everyone for the help!!!!!  :y
Title: Re: Code 73 & 74
Post by: valterferraz on 19 November 2008, 19:17:53
just for the sake of our personal archive: can you post pictures of this part, showing where it's mounted on the various models? A mechanic showed me today my PMS sensor where i saw nothing more than an oil ball...

TIA! :y