Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: eliteomegaman on 04 May 2010, 09:19:50
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Morning all :)
Have posted a few times about my facelift 2.5 elite with a misfire.
Just to re-cap -:
NOTHING showing on paper clip test or Tech 2
Coil pack replaced
Cam shaft sensor replaced (mechanic said fault code shown on tech 2 BUT didn't realise that the engine had to be running for it to clear!)
New spark plugs replaced
New HT Leads replaced (correctly fitted onto coil pack & no leads loose)
New fuel filter fitted
Compression test done y/day but nothing found!
Have now been advised that it could well be that the Exhaust Manifold Gasket could be the problem OR injectors (although 2 lots of cleaner where put in a couple of months ago when the problem first happened).
The exhaust does sound as if its blowing & i just wanted to ask anyone out there if they think that this could well be the cause of the bad misfire & if so is it an expensive job to do (i know the gaskets are only a few quid on ebay) labour wise?
I'm at the end of my tether with this & it's cost me a small fortune up to know which has completely made me skint!! :'(
PLEASE HELP!!!! :( :( :(
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Morning all :)
Have posted a few times about my facelift 2.5 elite with a misfire.
Just to re-cap -:
NOTHING showing on paper clip test or Tech 2
Coil pack replaced
Cam shaft sensor replaced (mechanic said fault code shown on tech 2 BUT didn't realise that the engine had to be running for it to clear!)
New spark plugs replaced
New HT Leads replaced (correctly fitted onto coil pack & no leads loose)
New fuel filter fitted
Compression test done y/day but nothing found!
Have now been advised that it could well be that the Exhaust Manifold Gasket could be the problem OR injectors (although 2 lots of cleaner where put in a couple of months ago when the problem first happened).
The exhaust does sound as if its blowing & i just wanted to ask anyone out there if they think that this could well be the cause of the bad misfire & if so is it an expensive job to do (i know the gaskets are only a few quid on ebay) labour wise?
I'm at the end of my tether with this & it's cost me a small fortune up to know which has completely made me skint!! :'(
PLEASE HELP!!!! :( :( :(
Don't get the cheap Ebay ones, only use the multi layer genuine Vauxhall ones from a dealer ;)
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Cheers for the message Pete & the quote
All i can say is J-E-S-U-S didn't realise it was so expensive :'( :'( :'(!!!!
Could the misfire be caused by the Exhaust Manifold Gasket leaking???
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Also had quite a random missfire when starting the car when it was still hot , turned out to be the MAF sensor as soon as I unplugged it the car ran fine
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Cheers for the message Pete & the quote
All i can say is J-E-S-U-S didn't realise it was so expensive :'( :'( :'(!!!!
Could the misfire be caused by the Exhaust Manifold Gasket leaking???
I would say no and given what your mechanics has changed....its time for a new mechanic!
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Cheers for the message Pete & the quote
All i can say is J-E-S-U-S didn't realise it was so expensive :'( :'( :'(!!!!
Could the misfire be caused by the Exhaust Manifold Gasket leaking???
I would say no and given what your mechanics has changed....its time for a new mechanic!
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Trouble is i have a car that's misfiring & 3 different people don't know what the problem is & can only guess what it might be - plugs? renewed, ht leads? renewed, compression test? done, fuel filter? done, loose lead on coil pack? nope, paper clip test? done with nothing showing & the list goes on!!!
If it is the Exhaust Manifold Gasket then at an estimated £170 i'm f**ked cos not got a pot to p**s in!!!!
Maybe some-one on this site has had the same problem & could give me advise as i'm not mechanically minded :-[
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Also had quite a random missfire when starting the car when it was still hot , turned out to be the MAF sensor as soon as I unplugged it the car ran fine
My misfire is there all the time as soon as i accelerate :'(
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You say the cam sensor was replaced (strange), do you mean the crank sensor?
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Also had quite a random missfire when starting the car when it was still hot , turned out to be the MAF sensor as soon as I unplugged it the car ran fine
My misfire is there all the time as soon as i accelerate :'(
Mine had the missfire/stuttering from 1800-2700 rpm also with no eml light or codes stored . Just unplug it and go for a test drive .
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You say the cam sensor was replaced (strange), do you mean the crank sensor?
Sorry ur dead right i mean the crank sensor code 31 :-[
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You say the cam sensor was replaced (strange), do you mean the crank sensor?
Sorry you are dead right i mean the crank sensor code 31 :-[
Code 31 is normal when the engine is not running, code 19 indicates crank sensor failure.
Hope you did not replace it based on 31 code!
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Also had quite a random missfire when starting the car when it was still hot , turned out to be the MAF sensor as soon as I unplugged it the car ran fine
My misfire is there all the time as soon as i accelerate :'(
Mine had the missfire/stuttering from 1800-2700 rpm also with no eml light or codes stored . Just unplug it and go for a test drive .
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How do i do that?
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You say the cam sensor was replaced (strange), do you mean the crank sensor?
Sorry you are dead right i mean the crank sensor code 31 :-[
Code 31 is normal when the engine is not running, code 19 indicates crank sensor failure.
Hope you did not replace it based on 31 code!
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YES!!!! My mechanic replaced it :-? not knowing that on the tech 2 test code 31 shows untill the engine is fired up - when i told him he didn't charge me for his embarrasment ;D
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Also had quite a random missfire when starting the car when it was still hot , turned out to be the MAF sensor as soon as I unplugged it the car ran fine
My misfire is there all the time as soon as i accelerate :'(
Mine had the missfire/stuttering from 1800-2700 rpm also with no eml light or codes stored . Just unplug it and go for a test drive .
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How do i do that?
Unplug MAF sensor :)
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You say the cam sensor was replaced (strange), do you mean the crank sensor?
Sorry you are dead right i mean the crank sensor code 31 :-[
Code 31 is normal when the engine is not running, code 19 indicates crank sensor failure.
Hope you did not replace it based on 31 code!
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YES!!!! My mechanic replaced it :-? not knowing that on the tech 2 test code 31 shows untill the engine is fired up - when i told him he didn't charge me for his embarrasment ;D
I would change your mechanic :y
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You say the cam sensor was replaced (strange), do you mean the crank sensor?
Sorry you are dead right i mean the crank sensor code 31 :-[
Code 31 is normal when the engine is not running, code 19 indicates crank sensor failure.
Hope you did not replace it based on 31 code!
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YES!!!! My mechanic replaced it :-? not knowing that on the tech 2 test code 31 shows untill the engine is fired up - when i told him he didn't charge me for his embarrasment ;D
I would change your mechanic :y
;D ;D ;D Hahaha have had ''3'' different people look at this car - thinking of putting it on YOU-TUBE :D :D :D!!!!
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How do i unplug Maf sensor & where do i find it?
Looked on Maintenance Guide Index but can't find an entry :-?
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Do you know if the crank sensor he fitted was a genuine one or not?
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Do you know if the crank sensor he fitted was a genuine one or not?[/quote]
Said he got a new one which would have been genuine BUT knowing him he might have got one from the scrap yard!
Having said that if this crank sensor is no good wouldn't it show up on a tech 2 test?
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Heres a pic I marked the location of the MAF sensor .
(http://i127.photobucket.com/albums/p131/Angeleyed200is/15042010307-2.jpg)
Note that this is on a Vectra B intake but it should give you an idea of what to look for :y
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Heres a pic I marked the location of the MAF sensor .
(http://i127.photobucket.com/albums/p131/Angeleyed200is/15042010307-2.jpg)
Note that this is on a Vectra B intake but it should give you an idea of what to look for :y
Thanks for that but its different on the Omega :(
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Have read somewhere on this site that the MAF sensor is 2nd down on the big pipe coming from the air box (hope that's correct?)
Unplugged it & couldn't start the engine! Must be doing something wrong!! :( :(
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When i took my car to Captain Zok at easter with my problem his son did a dignostic check & couldn't find any faults.
He did find that spark plug no.6 was cracked & getting an oil bath!
The Capatain said that the cats where knackered but 1st port of call would be to change the plugs & HT leads which as previously mentioned have now been done (y/day one of the brand new plugs - one week old, was a different colour & replaced but didn't help the problem!
Could the knackered cats be the cause of the misfiring/stuttering :-? :-? :-?
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When i took my car to Captain Zok at easter with my problem his son did a dignostic check & couldn't find any faults.
He did find that spark plug no.6 was cracked & getting an oil bath!
The Capatain said that the cats where knackered but 1st port of call would be to change the plugs & HT leads which as previously mentioned have now been done (y/day one of the brand new plugs - one week old, was a different colour & replaced but didn't help the problem!
Could the knackered cats be the cause of the misfiring/stuttering :-? :-? :-?
Hold on a minute mate.
A missfire without a code would point I would say to a HT problem. Spark Plugs, Leads & Dispack.
Now you say your plugs that have been in for a week.. that one is a different colour.. where is it a different colour on the electrodes? or on the white part that the leads go onto?
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Hia Darth
i'll have to ask my neighbour as it was him that has done the recent work & told me the new plug was a different colour but didn't tell me where on the plug. have to get back to u on that.
what could be the problem when a plug turns a different colour?
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If you have a cam cover gasket leak and the oil is leaking into the spark plug wells that is likely to be the cause of the misfire. Engine oil is full of tiny metal particles which can short the plug out.
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When Captain Zok's son had a look No. 6 plug was cracked & swimming in oil :o
Monday when further tests were done & ht leads replaced one of the new plugs was a different colour (not sure which plug) & the car has only travelled a mile or so - if its the rocker cover then could this be the cause of the misfire/stuttering :-?
So far i've had 3 people with 3 different theories -
1. Exhaust manifold gasket
2. Knackered cats
3. Leaking rocker covers
I'll take a poke in the dark & based on the different coloured plug i'd say no. 3
Anyone want to participate in this exciting guessing game :-? :( :-/
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Right....lets consider idle:
1) Exhaust manifold would need to be falling off to cause an idle missfire.......particularly when first started and running open loop.
2) Cats are a possible.....but you say its running rough so that sounds unlikely (but not impossible).
3) Leaking cam cover gaskets.....possible as this could cause a miss fire.
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Thank you Mr Administator :y
This problem has been going on for so long now that i'm sure its got a mention in the Doomsday Book ::)
I know that my wallet has never been so cold due to it being empty & to be totally honest i'm sure rocker cover gaskets replacement will be well over £100 & funds won't stretch that far :'(
But at least i can sleep at night now knowing what the problem probably is :y
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Well....as a starter for ten, clean all the breather system out and then clean the plug wells out.
This will cost about 3 quid and may sort it short term
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Will do & thanks again :y
If this works i'll leave u a little something in my will ;)
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in the old days carbs and stuff a misfire could be caused due to a weak mixture.
i know with closed loop system its supposed to self regulating..
if excess air is getting in from other than measured sources..
the lambda sensor is registering a rich mix and turning things down..
might by worth checking the exhaust readings.. :-?
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in the old days carbs and stuff a misfire could be caused due to a weak mixture.
i know with closed loop system its supposed to self regulating..
if excess air is getting in from other than measured sources..
the lambda sensor is registering a rich mix and turning things down..
might by worth checking the exhaust readings.. :-?
just re read your topic..
1. is the cam covers still leaking?
2.the plenum chamber and associated pipework needs to be checked for splits disconections/ air leaks.
3. no codes.. concentrate on mechanical items.
4 checking/inspecting is cheap. :)
5 .egr valve sticking allowing dirty air in.
6.idle valve sticking slightly open.