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Omega Help Area => Omega General Help => Topic started by: dukie on 03 May 2014, 23:33:30

Title: 2.2 petrol estate misfire
Post by: dukie on 03 May 2014, 23:33:30
Help!  2.2 auto petrol has misfire on cylinder 4,runs like sack of s**t! yet if revved to above 2000rpm runs ok,back to idle and misfires badly. Cleared codes which keep coming back as 1781 & 1740. New plugs fitted,coli pack tested and throttle housing cleaned but still no joy! any ideas?????
Title: Re: 2.2 petrol estate misfire
Post by: blackviper90210 on 04 May 2014, 08:06:59
Might be wrong, but I believe it's your can sensor failing.

Lift youre bonnet and the sensor is at the FRONT top part of engine,,underneath black plastic cover saying ecotec on....the wire to it is going in where the cut out on cover is.   about 10 minutes to change it

They'll be an expert on shortly to confirm or deny ::)

HTH's :y
Title: Re: 2.2 petrol estate misfire
Post by: steve6367 on 04 May 2014, 08:23:38
When the coil pack was out any oil or water in the plug wells?

Steve
Title: Re: 2.2 petrol estate misfire
Post by: badmuver on 04 May 2014, 11:52:59
http://www.omegaowners.com/forum/index.php?topic=90628.0  :y
Title: Re: 2.2 petrol estate misfire (2001 cdx auto)
Post by: dukie on 10 May 2014, 15:01:19
Replaced camshaft sensor,engine started and ran very lumpy and now will not start again,turns over but does not fire,checked key and re synched it to car just in case but eml light not flashing so don't think its that...any ideas or is this a trip to scrapyard for car that's only done 66,000 miles!??? >:(
Title: Re: 2.2 petrol estate misfire
Post by: tunnie on 10 May 2014, 15:04:35
2.2 is good for decent miles, mine is on 171k  :y

Unplug the cam sensor, then start, it will take a lot of cranking, but should fire and idle ok. Assuming everything else is fine.

Another test, unplug the MAF sensor, see how it runs.
Title: Re: 2.2 petrol estate misfire
Post by: plym ian on 10 May 2014, 20:14:50
I had misfire probs on mine recently. Turned out it was one coil pack rubbers were past it split on bottom. New set fitted £18 from Vauxhall problem solved :y
Title: Re: 2.2 petrol estate misfire
Post by: dukie on 11 May 2014, 23:00:27
Put the new rubbers on coil pack first so I know its not that,just keeps turning over but making no attempt to start. Got spark at plugs so ruled out coil pack,throttle body and Maf all cleaned out,new cam sensor fitted !!!! any suggestions gratefully received  :-[ :o 
Title: Re: 2.2 petrol estate misfire
Post by: 05omegav6 on 11 May 2014, 23:59:51
Where did you buy the camshaft sensor?

Genuine Vauxhall from a genuine dealer only :y none of that ebay/pattern rubbish ::)
Title: Re: 2.2 petrol estate misfire
Post by: JamesV6CDX on 12 May 2014, 13:33:52
Let it stand overnight. Start from cold and watch the exhaust. Any steam? Any funny smells eg petrol in the coolant bottle?
Title: Re: 2.2 petrol estate misfire
Post by: dukie on 12 May 2014, 23:39:51
Quote from: Taxi Al on 11 May 2014, 23:59:51
Where did you buy the camshaft sensor?

Genuine Vauxhall from a genuine dealer only :y none of that ebay/pattern rubbish ::)

Yeh it was an Genuine sensor...did run misfiring in limp mode before changing,now just turns over but will not fire...think gallon of petrol and a match is next option!!!! >:( :( >:( :(