Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: stevebubs on 12 January 2008, 17:47:41

Title: Won't start after replacing rocker cover gaskets
Post by: stevebubs on 12 January 2008, 17:47:41

95% sure I've got all the plugs and leads the right way round but car won't start properly.

Turn the key and the car revs slightly then cuts out.

Know I've probably missed something somewhere, and think it's likely to be a hose or 2 on the manifold switchover valve assembly at the back of the plenum.

Does anyone have any pictures of this area, or a list of what should be connected to what?

If anyone's got an Omega haynes manual, I know that there's definitely not a hose or anything in the bell shaped actuator (picture 17.19) so need to figure out what should be plugged in here.

Would take some pictures but it's gotten too dark outside to really see what I'm doing.

Title: Re: Won't start after replacing rocker cover gaskets
Post by: stevebubs on 12 January 2008, 17:48:49

PS it's a facelift 2.5 V6 as per my profile....

Title: Re: Won't start after replacing rocker cover gaskets
Post by: stevebubs on 12 January 2008, 18:58:34

Sorted. Missed the pipe between solenoid and switchover valve.

Car still not running right (irratic idle now) but definitely starting.

S

Title: Re: Won't start after replacing rocker cover gaskets
Post by: Auto Addict on 12 January 2008, 18:59:27

Quote

Sorted. Missed the pipe between solenoid and switchover valve.

Car still not running right (irratic idle now) but definitely starting.

S

Air leak?

Title: Re: Won't start after replacing rocker cover gaskets
Post by: stevebubs on 12 January 2008, 19:04:12

Could either be air leak or ignition. Haven't done the fasteners on the plenum air pipes so could be either. Will investigate further tomorrow.

Sounds more like it's skipping a beat, TBH - could an air leak cause that?

Title: Re: Won't start after replacing rocker cover gaskets
Post by: ians on 12 January 2008, 19:38:38

is everything seated properly - plenum/ black ecotec bit on top?

Its also easy to dislodge the HT leads off the DIS pack which will lead to a misfire.

Title: Re: Won't start after replacing rocker cover gaskets
Post by: stevebubs on 12 January 2008, 19:43:59

Going to check tomorrow.

In addition to the erratic firing, a loud "clicking" sound has also appeared. Any suggestions?

Title: Re: Won't start after replacing rocker cover gaskets
Post by: stevebubs on 13 January 2008, 12:55:44

OK. Clicking problem now fixed.

1) O-Ring gasket under the plenum wasn't seated properly

2) Hydraulic lifters were dry - after about 30 seconds running after fixing the above, the problem went away

This left me with a quiet clicking sound that went away when the engine was fully warm. Tracked this down to the EGR valve.

Title: Re: Won't start after replacing rocker cover gaskets
Post by: stevebubs on 13 January 2008, 12:56:20

PS Irratic idle was an air leak - once all the clips were done up, it idled properly.

Title: Re: Won't start after replacing rocker cover gaskets
Post by: Dazzler on 13 January 2008, 13:20:24

Happy days, well done mate. You do have to be quite carefull when rebuilding these V6,s. :y

Title: Re: Won't start after replacing rocker cover gaskets
Post by: stevebubs on 13 January 2008, 13:24:08

Quote

Happy days, well done mate. You do have to be quite carefull when rebuilding these V6,s. :y

That's why I left it last night - far too dark to see what I was doing properly...

Title: Re: Won't start after replacing rocker cover gaskets
Post by: cem_devecioglu on 13 January 2008, 13:29:37

Inlet manifold o-rings are cheap replacement..And tend to leak air if they are old ..

Specially in the cold weather cold engine condition..

Change them..