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[Ulap31]

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.

[Ulap31]

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

[tunnie]

You want to read the codes instead 

[Nick W]

You want to read the codes instead 

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.

[Ulap31]

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.

[Nick W]

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.

[biggriffin]

 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..

[Ulap31]

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.

[Nick W]

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.

[Ulap31]

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.

[johnnydog]

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.

[Ulap31]

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.

[Doctor Gollum]

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. 

[laney101]

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]

[johnnydog]

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!!