Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: slb on 26 February 2009, 20:57:14

Title: 2.5 v6 misfire
Post by: slb on 26 February 2009, 20:57:14

hi all new on here but thort it be a good place to start. heres my pro i have a v reg 2.5 v6 saloon 100300mls fantastic car had it 2 years nothing ever gone wrong till now a misfire on no3 cyl no warning light on dash and yep the usual oil in plug wells sorted that with new rocker cover as today i striped all top of engine off to get to dis pack,all plugs on 135 bank ok all oil gone out of wells and it only misses on no 3cyl found this out by removing ht leads so its poss not a dis pack fault or any other??? so could it only be the ht lead???? any help app and welcom thanks a big vauxhall fan  :-[ :-[ :-[

Title: Re: 2.5 v6 misfire
Post by: MutantCav on 26 February 2009, 21:03:10

Oil will cause the rubber to rot and crack on the leads...could well be the lead or the plug itself but it has been known for a failed dispaick to only fail on one cylinder

Title: Re: 2.5 v6 misfire
Post by: Entwood on 26 February 2009, 21:05:14

"Hello" and welcome :)

If the oil has been sitting there for some while, it is often the case that it damages the HT lead through the immersion in oil.

A DIS pack problem "usually" involves more than one cylinder as the system is a "wasted spark" one.

If it was mine I'd try swapping the leads around to see if the fault transfers, its a rough check but would help pin down a failed lead ??

HTH

Title: Re: 2.5 v6 misfire
Post by: dbug on 26 February 2009, 21:09:06

Welcome to OOF  :y

Plug lead broken down - replace or substitute with one of the good ones and see if misfire "moves" to another cylinder.

Title: Re: 2.5 v6 misfire
Post by: slb on 27 February 2009, 23:31:58

Quote

hi all new on here but thort it be a good place to start. heres my pro i have a v reg 2.5 v6 saloon 100300mls fantastic car had it 2 years nothing ever gone wrong till now a misfire on no3 cyl no warning light on dash and yep the usual oil in plug wells sorted that with new rocker cover as today i striped all top of engine off to get to dis pack,all plugs on 135 bank ok all oil gone out of wells and it only misses on no 3cyl found this out by removing ht leads so its poss not a dis pack fault or any other??? so could it only be the ht lead???? any help app and welcom thanks a big vauxhall fan  :-[ :-[ :-[

thanks to all replies have changed all leads but misfire is still there and still seemes to be cyl no3 dis pack seems ok too all leads fireing. i intend now to change plugs and theres seems to b a small whezzing noise from back of engine near or around left bank could this also cause misfire???????

Title: Re: 2.5 v6 misfire
Post by: slb on 28 February 2009, 20:06:00

what does code 135 mean when it flshes up on the paper clip test i know what it says on fault code list but unsure of what it means  :-/