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1

Omega General Help / Re: irregular idle and hesitancy through 50-60mph

« on: 14 February 2009, 23:32:41 »

I think I may have found the problem.  On the underside of the scuttle there is a wodge of black spongy material.  There was a small tear in the fabric just above spark plug number 6 and a white fluid was oozing out of the black spongy thing probably causing plug 6 to misfire.

The black spongy thing is hanging in the airing cupboard drying out.  Why does it get wet/stay wet?  

Also some of the outer rubber casing of number 6 spark plug lead has come off.  Does the HT lead need to be replaced?

There was only a smear of oil on a couple of the plugs and no evidence of flooding.  All the plugs were cleaned and the engine seems to run more smoothly but the car hasn't been driven yet.

PeterF    

2

Omega General Help / Re: irregular idle and hesitancy through 50-60mph

« on: 12 February 2009, 13:26:21 »

Thank you for the suggestions.  I'll start looking at the spark plugs,  HT leads and see if there's oil in the spark plug well.  Hopefully it's that simple.

Re my cambelt.  I've confirmed with the Vx garage that did the service, before I had the car, that the cambelt and pulley tensioners were all changed at 50.5k miles 5 years ago.  The mileage now is 89k.  I'll soon be living on borrowed time.  Are there recorded instances of cambelts going at under 50k miles?

PeterF

3

Omega General Help / irregular idle and hesitancy through 50-60mph

« on: 11 February 2009, 17:09:41 »

Hi everyone,

First post.  Bought an Omega CDX V6 auto 2.5L estate 1999 'S' plate (85k miles) after my Granada had to be towed the last 50 miles (failed oil pump?, 165k miles and not worth resurrecting).

I'm quite pleased with it, the only thing that seemed not to work were the heated seats.

However, recently idle has become a bit irregular (600-800 rpm) and lumpy.  When accelerating in town it seems to miss a beat as though it was only running on 5 cylinders.  On a motorway it 'judders' when going through the range 50 to 60 or 65mph.  At 70/75 mph it runs OK.

I read out the fault codes using the paper clip test:
at rest:  12 31 12
idling:  12 12
so that shows up nothing wrong.

Normally I would have taken the spark plugs out and checked them but I've discovered with the Omega that half the engine has to be moved first! so I've not done that yet.

Can anyone suggest please where I should start looking first?

Also, for the first half mile or so when starting from cold the gear changes occur at quite high revs, up to 3000.  But after a short distance they occur at about 2000rpm.  Is this normal or does it indicate low transmission oil?  I've not checked the oil yet because that involves raising the car and getting underneath and I've had shoulder surgery recently, but i can probably do it now.

Any help greatly appreciated.

Peter

4

Omega General Help / Re: Timing belt change intervals

« on: 12 February 2009, 13:15:22 »

I reported earlier that my Haynes book says the interval was changed from 40k to 80k from 1997.  I decided to telephone the garages that had done earlier services before I bought my car to see when a cambelt change was done.

The first garage I rang told me the following tale.  The service interval was reduced from 80k to 40k (presumably after the increase) but Vauxhall did not tell customers.  They relied on Vx garages to tell them when the car was taken in for a service.  So someone taking their car to a non-Vx garage would not necessarily know.  An Omega owner with 72k miles who didn't know about the 80k to 40k reduction had booked a cambelt change with the Vx garage.  He didn't make it, the engine blew before he got there and he paid £3k for a new engine.

PeterF

5

Omega General Help / Re: Timing belt change intervals

« on: 12 February 2009, 01:26:06 »

My Haynes book says the replacement interval for the timing belt was INCREASED from 40k to 80K in 1997 (not decreased from 80k to 40K).