Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: Glewsfox on 17 May 2011, 22:20:49

Title: 2.2 auto petrol y reg poor start from cold
Post by: Glewsfox on 17 May 2011, 22:20:49

Hi iam new on here and i need some help. I have a problem with a Z2.2xe omega its a tw..t to start from cold when it does fire it coughs and splutters through the inlet manifold then misfires for a bit lacks power tried air mass checked fuel pressure checked valve timing changed coil and spark plugs exhaust and cat are ok ecu keeps coming up with lots of different codes checked for air leaks all seem ok runs ok when hot PLEASE HELP !

Title: Re: 2.2 auto petrol y reg poor start from cold
Post by: TheBoy on 17 May 2011, 22:35:23

What are all the codes in the engine ecu?

Title: Re: 2.2 auto petrol y reg poor start from cold
Post by: Stallion on 18 May 2011, 01:13:00

Hi welcome to the forum!!  :y your saying the engine lacks power, and you have changed the Air maf, was that replaced with a new unit? Asking as i had the same problem with cold starts, but that was due to a faulty MAF!
And as TB said list all the codes on here will help!!  :y

Title: Re: 2.2 auto petrol y reg poor start from cold
Post by: Glewsfox on 18 May 2011, 17:57:26

The most common code that appears after a few minutes is P0130 O2 sensor 1 open circuit. But the others that appear when they feel like it are P170 lean exhaust P1700 svs request via can P0335 crankshaft sensor open circuit P0301 cylinder 1 misfire detected P0302 cylinder 2 P0303 cylinder 3 P0304 cylinder 4 all misfire detected Air mass meter was swopped for a known good 1 of a perfect running car. Ect  senser reading ok when cold. Its really doing my head in i think engine ecu is f..cked ? PLEASE HELP !

Title: Re: 2.2 auto petrol y reg poor start from cold
Post by: RobG on 18 May 2011, 18:04:45

Need to get all codes cleared and start again

Title: Re: 2.2 auto petrol y reg poor start from cold
Post by: Glewsfox on 18 May 2011, 21:38:23

Cleared the codes a few times P0130 is the most common code + P0301 or any one of cylinders coming up as a misfire P0302 P0303 or P0304. I cant understand why it backfires through inlet manifold and will not rev just dies when valve timing is ok and cam and crank sensors are reading ok. when it gets slightley warm say 30 to 40 degress on ect sensor it revs pretty well. This fault happens everytime without fail ie poor to start when cold ok when slightley warm + revs ok aswell  :-/

Title: Re: 2.2 auto petrol y reg poor start from cold
Post by: henryd on 18 May 2011, 21:43:33

if your oxygen sensor is open circuit that is probably causing the cylinder misfire codes,check the sensor wiring and if all connections are good replace the sensor

Title: Re: 2.2 auto petrol y reg poor start from cold
Post by: Glewsfox on 18 May 2011, 22:44:35

I have replace o2 sensor its still the same

Title: Re: 2.2 auto petrol y reg poor start from cold
Post by: Glewsfox on 18 May 2011, 22:47:43

Sorry i forgot to say done wiring checks to 02 senser and that seems ok

Title: Re: 2.2 auto petrol y reg poor start from cold
Post by: henryd on 18 May 2011, 22:54:58

so you've checked the 02 sensor wiring and replaced the sensor and still have the same codes coming back after wiping them off ?

Title: Re: 2.2 auto petrol y reg poor start from cold
Post by: Glewsfox on 19 May 2011, 09:24:14

Yes wiring ok and fitted new o2 sensor and code stillcomes back