Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: Ulap31 on 07 September 2019, 17:56:21
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Hi all, still having problems with an omega 3.2 2002 reg auto.
My previous posts show the problems and parts that have been replaced.
The car seems fine at idle although fuel consumption shows 18 mpg. When it's in drive it sounds rough on the passenger side. I have live data but not sure how to post it on here.
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Think I've sorted it links are by dropbox
https://www.dropbox.com/s/r60oqhdvgkfo4us/20190906_155628.jpg?dl=0
https://www.dropbox.com/s/9tmw414i3dhudhs/20190906_154445.jpg?dl=0
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You want to read the codes instead :y
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You want to read the codes instead :y
That's just a start.
Live the data is the way to diagnose why the codes are listed.
But the same bit of kit will do both.
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There are no error codes since the last time. Well since 2 of the lambda sensors were changed.
Compression tests were fine since head gaskets changed.
MPG is not what you’d expect at 18 mpg.
Have checked timing belt with cam locking kit and that is spot on.
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There are no error codes since the last time. Well since 2 of the lambda sensors were changed.
Compression tests were fine since head gaskets changed.
MPG is not what you’d expect at 18 mpg.
Have checked timing belt with cam locking kit and that is spot on.
That's a good start.
How good are your coil packs/spark plugs?
While you're extracting those, have a proper look for air leaks in the intake, but particularly the plenum/manifold joints.
When was the thermostat replaced? It's a pain to do, so is one of the few cases it's worth spending £15 on a new one and fitting it. Actually, with such poor economy this ought to be first in the list.
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Do a complete check of all the connections, as Nick said check for leaks, especially plenum to inlets, the O rings could have moved, also coolent temp sensor,, Alternatively book it in to Serek.. :y
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Thanks for replies.
The cars had new Bosch coil packs, genuine spark plugs and a new thermostat when the head gaskets were replaced. Could this be exhaust sensor issue or maybe the cats, the sensors were moved to stop the eml light coming on.
I had to replace a pre cat and after cat sensor with original ones as they were damaged when being removed.
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It could be any of those things.
But it is MUCH more likely to be something that didn't go right when the work was done - a dislodged manifold gasket is a real possibility. The rule for this sort of fault finding is always to go back over what has just been done. It's time to start taking it apart again.
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Sorry been very busy.
Can I have part numbers for the exhaust sensors. The car is 2002 3.2 automatic estate would like the bosch numbers if any one could get them. In the process of renting a garage as the English weather is so unreliable so I can actually get this back up and running.
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The Bosch lamda sensors for the 2.6 and 3.2 auto are -
9195606 - 0 258 006 387 (AH label)
9199469 - 0 258 006 176 (BG label)
On a manual vehicle, the equivalent for 9199469 is a different sensor so make sure they are as above . The no is also stamped around the head of the sensor.
Hope this helps.
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Thanks going to renew all then try some Cataclean in it. I've checked over all setting etc so if this fails then I think new cats.
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If you think you're having cat issues...
Fill it with Shell V Power from almost empty. Add a bottle of Wynns injector cleaner. Drive it like you stole it until the fuel light comes on and repeat.
If you get more than 250 miles from the tank, you haven't been driving it hard enough. ;)
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Which lambda is which
Ah before
Or bg before cat ??
Or does it not matter
quote author=johnnydog link=topic=145579.msg1929932#msg1929932 date=1579357372]
The Bosch lamda sensors for the 2.6 and 3.2 auto are -
9195606 - 0 258 006 387 (AH label)
9199469 - 0 258 006 176 (BG label)
On a manual vehicle, the equivalent for 9199469 is a different sensor so make sure they are as above . The no is also stamped around the head of the sensor.
Hope this helps.
[/quote]
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AH is the front sensor, and BG is rearmost.
You could just check the ones fitted and replace with the same.
I'm certain (although its a while since I changed one) that the plugs will be different to avoid incorrect fitment.
And yes it does matter which sensor goes where, as their function is different - GM wouldn't have had two different sensors if it didn't matter!!
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Plugs are the same, difference is the loom length :y
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Unfottunetely the stickers were no longer on mine so wouldnt have known.
Im gonna tomorrow there in the right way around haha jist incase ...
AH is the front sensor, and BG is rearmost.
You could just check the ones fitted and replace with the same.
I'm certain (although its a while since I changed one) that the plugs will be different to avoid incorrect fitment.
And yes it does matter which sensor goes where, as their function is different - GM wouldn't have had two different sensors if it didn't matter!!
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You'll figure it out, just don't take all four off at once... ;D
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If you decide to go the Ebay route, last time I checked, a BG sensor was listed with one seller under the correct Bosch number, but the generic / stock photo on the listing showed a sensor with the AH tag.
Worth, in my opinion, confirming with the seller that you are getting the correct sensor before purchase... :y
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also coolent temp sensor
This and again this. There are 2, 1 for gauge, one for ECU, you want the ECU one. I would only trust a genuine part for this, but last time I bought one, it was £12.
I can not stress this enough, if this sensor is dead, it fails leaving the ECU thinking it's cold, cold engine = add more fuel.
Plugs are the same, difference is the loom length :y
Again this. The sensors are the same, the cable length is different as they are in different places on the exhaust.
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I think this is probably the problem that the sensors are either on the way out or are wrong. I changed 2 from fleabay so I'm thinking that I'll change all four for the correct ones.