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1

Omega General Help / Re: looking to buy an estate auot or manual problems???

« on: 10 October 2011, 08:24:03 »

sorry, I am down in eastleigh hampshire.  The ex's motor was a 2.6 veccy  so i did all the work to that , rocker covers, sump, all th eleakks etc  etc etc and I did the timing belt as I have the necesaary tools at home thankfully. I did see that the omega tailgate does suffer with rust on the spindle but well will have to wait and see if I can find one in good condition , been looking round fleabay and the traders so  keep look  out , whats the average price I should be looking at for a top spec model like a omega elite  or cdx etc ?

2

Omega General Help / looking to buy an estate auot or manual problems???

« on: 10 October 2011, 07:48:12 »

all, ok times have changed for me so looking for a  3 or 3.2  estate,  I see a lot come as autos etc, how releiable are the auto boxes compared to the manual boxes I kind of got used to driving the vectra 2.6 estate  that my ex  had and it was a good work horse so time to hang up my shoes and part with my old girl and buy an omega estate.


Whats the fuel economy like??? anything bar leaking gaskets that I assume   are common on the v6 etc etc

I would like the omega elite  with all the toys but still shopping around atm

thanks
jules

3

Omega General Help / Re: p0420 , 0430 help please

« on: 08 November 2010, 22:03:37 »

been running super unleaded and even tried v power for a month  no difference. but I have been reading something tonite.

http://chase.co.nz/AboutChaseOxygenSensors.pdf

page 5 , it mentions that if the  post lamda sensor  has the same readings as the  pre sensor the cat is failing. well the reading in milli volts is the same in both post and pre but the air fuel ratio stays in  lean..   I had the car down the mot station sat morning and the  emissions test was spot on so I doubt i got a dodgy cat its brand spanking new .  I checked the readings on the original manifolds as well and the milli volts is the same so the more I keep reading into this the more iam confused. I cannot get the post sensor to switch  over to a rich condition , but then is it ment to???

4

Omega General Help / Re: p0420 , 0430 help please

« on: 08 November 2010, 20:34:22 »

Ok I have been out playing tonite with "My Naff Code Reader", the car was stone cold and was not used all day.

Op com shows snabk 1 sensor2 and bank 2 sensor 2 showing  lean even from start up and it stayed like that right up to when the fans kicked and the engine rev now and then. The precats snesors were doing there job  but i  am unsure if the post lambdas are doing theres. I swapeed them back over to the original positions and the readins stayed the same  so lean it stayed.  We did a live recording   for the whole duration and excell shows it via filters that both post cats only showed lean from intial start up to  the fans kicking in and with bliping the throttle now and then.

 Does anyone  have a map they can check to see if theres does the same  ie the post cat lambdas stay lean permanently?  ref a y26se engine

help required

5

Omega General Help / Re: p0420 , 0430 help please

« on: 08 November 2010, 12:21:01 »

I can remember watching the air fuel ratios on saturday  on the post lambdas and they stayed lean even when revving the engine so can "My Naff Code Reader" be used whilst the car is being driven? or does it close the port off when the ecu detects it being driven?

6

Omega General Help / Re: p0420 , 0430 help please

« on: 08 November 2010, 12:02:08 »

the delay I assume being from the cat doing its job thus  if the lambda tip is not fully in the exhaust stream  it would run lean for to long and if the ecu is looking  for the ocasional "rich" then that may be my problem possibly ie the lambda tip  needs to be moved in further - Am I finking along the right lines??

7

Omega General Help / Re: p0420 , 0430 help please

« on: 08 November 2010, 11:11:16 »

also if the main cat is doing its job when running at optimum temperature should the post lambda   be reading lean  on a permanent basis as the cat wil be doing its job?

8

Omega General Help / Re: p0420 , 0430 help please

« on: 08 November 2010, 10:54:09 »

Ok you mention  the following

"The sensor being out of the main airflow will cause it to react a little slower so this would tend to make the cat look more effective. Unless it's now reacting so slowly that the ECU is interpreting that as no activity...?" 

Thats what I was thinking I even tried the spark plug defoulers and  that  didnt help either.  I am clasping at straws here but may be the lambda tips do need to be  well into the exhaust stream  to work, now that I have the  new cat fitted maybe I should  lower the  tips  further in. This will mean some work me  as I have welded in new boses so I am going to have to grind them down a bit .

I know the post  lambda dont effect the perfect the performance   so whilst they are on  there is only the dash light to have to worry about but dont want to remove it just yet.

A tough one. There's no real way to check the output of the post-cat lambdas because they depend what the working condition of the cat is. I would expect them to pretty much follow the pre-cat sensors until the cat starts working and then it's anybody's guess. If both sensors are showing activity of some sort (try blipping the throttle and see what happens) I would say they are OK.

The ECU runs a cat check cycle once the engine is up to temperature and driving conditions are right. This consists of setting a constant rich or lean mixture for a few seconds and observing how long the rich / lean indication takes to propagate from the front Lambda sensors back to the post-cat sensors. If the cat is working there will be a good delay as the cat absorbs the excess oxygen or depletes its' stored oxygen depending on the mixture.

The sensor being out of the main airflow will cause it to react a little slower so this would tend to make the cat look more effective. Unless it's now reacting so slowly that the ECU is interpreting that as no activity...?

Might be worth swapping the post-cat sensors between the two banks and see if the fault follows the sensor?

Kevin

9

Omega General Help / p0420 , 0430 help please

« on: 08 November 2010, 09:57:11 »

Ok I am new to this foroum as the misses has a 2.6  vectra b  which is used in the omegas obviously . I have been thru this foroum looking up the fault codes  p0420 and p0430  and  followed the advise in moving the post lambdas  to behind the main cat. Ok I did this on the weekend  , I had a spare set of mainfolds ready so I left the original post lambdas in place  and used another set of lambdas (post)  and   fitted them behind the cat. I used "My Naff Code Reader" to check the values  ie the air fuel ratios and  this is what I get.

1. Both pre lambda are flicking between  rich/lean in about 1 sec intervals and from what I have been reading this is correct as is the values  for milli volts, both lamdas are  putting out the same readings.

2.  ok the post lambdas are reading lean  in the air fuel ratio, Am I correct that as the main cat is doing its buisness I should only see lean readings? I rev the car and it stays lean  and does not go to rich. The milli volts is going up and down  the same as each other  so I can assume that parts correct.

Ok I did have one  glitch were the spare lambda went lazy on the air fuel mix so I used another from another spare set of maicats that I had and it was back to normal. So in theory  this should  stop the 0420 0430 codes coming on well last nite a fault code showed again, it was 0420      there was no 0430 but this may have come on eventually but I dont know.

So the light is back on and following the advise in moving the  lambdas back wards to behind the new cat which I would like to point out is now brand new as  the flexi had failed on the original so I had to buy a whole new down pipe. So I am  stuck and the only thing that may have had an influence was the depth of the probe of the lambdas  in the exhaust stream. The actually lambda end is dead flush with the ID on the exhaust,  would this have made a difference, do I need to put the lambdas further into the exhaust flow??

I 4eset it all last nite with "My Naff Code Reader" and will see if the codes come back  , also did I need to reset the lambda feedback loop thats showing in "My Naff Code Reader"???

Thoughts much aprreciated.

10

Omega General Help / Re: untraceable oil leak

« on: 03 September 2010, 11:16:34 »

i used the  vauxhall recommended sealent on the half moon faces,  would not using it along the gasket faces be a better option  then

11

Omega General Help / Re: untraceable oil leak

« on: 03 September 2010, 10:09:55 »

as a newdie to this group I had the same problem its a vecky with a Y26se lump , I replaced all the rocker covers with genuine items,   took sump off and cleaned and resealed, did oil filter coversion, changed cam shaft seals  All the leaks have gone now and bugger its got a leak again, can I find it no!!!!!!!its  soaking my damn starter motor  and over a period of 3-4 days collects at the bottom of the sump.


sigh 

12

Omega General Help / Re: y26se oil leak newbie

« on: 19 August 2010, 22:17:26 »

whoa done it , it was a rocker cover issue, the keak was being obsecured by the  injection manifold and breather box, no more leaks.


Now the timing belt to do on sat but can I change the cam shaft seals and crank oil seal whilst they are in place?
thanks

jules

13

Omega General Help / Re: y26se oil leak newbie

« on: 19 August 2010, 15:48:40 »

I was wondering if there were any pressurised galeries in the head, I will take apart agin tonite to have a look and se whats happening. I did stip the breather box off and managed to dismantle it and totally clean it up and clear the blocked pipes that I did have.

My endoscope hasnt arrived but I got my hands on a small usb web cam that  may be smal enough to go into position tonight  so fingers crossed.

thanks

14

Omega General Help / Re: y26se oil leak newbie

« on: 19 August 2010, 10:39:48 »

any one?

15

Omega General Help / y26se oil leak newbie

« on: 18 August 2010, 21:25:33 »

Hi All, I am new to the group, Its not an omega but its a vectra v6 witha  y26se engine  same as some of the omegas.

The problem I have is an oil leak thats develped from behinnd the starter motor.  I have checked the rocker covers 3 times an they are bone dry and I have thoroughly removed  the breather system and cleaned it all out. Thhe leak is coming down from behind the starter and dripping onto the intermeidate shaft also going down to the sump.

 I have been under the car so many times now I am  just lost for words. The leak   is a slow leak that comes down past the back of the  starter  and you can actually watch it when the car is running. on axle stands.

My mind keeps thinking head gasket  but is there something behind the starter like a pipe or core plug maybe for the oil ways?

help any one please  :-/