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Omega Help Area => Omega General Help => Topic started by: megaomega123 on 14 March 2008, 15:15:52

Title: DIS pack and leads changed no change!
Post by: megaomega123 on 14 March 2008, 15:15:52

Managed to change the dis pack and leads today but have no change in the symptoms.
They are: Very noisy exhaust, exhaust shaking and shuddering when pulling off. Exhaust is popping at times. Engine sounds smooth through the range. Power is down and consumption is very bad 13mpg average.
Should I now presume that it is a cat or both that need replacing?  :'(

Title: Re: DIS pack and leads changed no change!
Post by: JamesV6CDX on 14 March 2008, 15:59:26

Rob -

COMPRESSION TEST !    [smiley=evil.gif]

Title: Re: DIS pack and leads changed no change!
Post by: JamesV6CDX on 14 March 2008, 16:00:54

shaking is a misfire.

I would be telling people to check valve timing in these situations, but I'm aware we did your belt quite recently   :)

Title: Re: DIS pack and leads changed no change!
Post by: megaomega123 on 14 March 2008, 16:10:46

Hi James
What will a compression test tell me? what is the probable problem and is it economical . I need reliable transport asap so need to see if it is worth repairing or just get something else.

Title: Re: DIS pack and leads changed no change!
Post by: tunnie on 14 March 2008, 16:25:38

Quote

Hi James
What will a compression test tell me? what is the probable problem and is it economical . I need reliable transport asap so need to see if it is worth repairing or just get something else.

compression test will tell you wether the head gasket is ok.

any water on the oil on the dip stick?

Title: Re: DIS pack and leads changed no change!
Post by: megaomega123 on 14 March 2008, 16:29:26

No water/oil mix anywhere. Everything seems dandy.

Title: Re: DIS pack and leads changed no change!
Post by: Andy B on 14 March 2008, 16:31:53

Quote

....

compression test will tell you wether the head gasket is ok...

Or burnt out valves  ::)

Title: Re: DIS pack and leads changed no change!
Post by: megaomega123 on 14 March 2008, 16:49:15

Quote

Quote

....

compression test will tell you wether the head gasket is ok...

Or burnt out valves  ::)

Is that economical to fix?

Title: Re: DIS pack and leads changed no change!
Post by: ffcgary1 on 14 March 2008, 16:51:54

 I have the same syptoms on a veccy b that i have just fitted a 3.0 into and the engine seems to run lumpy at idle and appears to have a slight miss as you blip the throttle and then runs fine at higher revs, the fuel consuption is about 12 mpg in urban traffic. the engine that was in it holed a piston and the oil that had found it's way into the  plenium and exshust means that the cat could be shagged. :-[

Title: Re: DIS pack and leads changed no change!
Post by: JasonH on 14 March 2008, 18:59:51

Any fault codes?

Title: Re: DIS pack and leads changed no change!
Post by: Marks DTM Calib on 14 March 2008, 19:06:21

Did you DEFINATELY connect the plug leads on the 2-4-6 bank up correctly to the DIS pack.

Title: Re: DIS pack and leads changed no change!
Post by: Dave-C on 14 March 2008, 19:19:05

Are the plugs OK?  Even if new, still could be faulty...  could the cam belt have slipped, even though it's recently been done????? :-/

Title: Re: DIS pack and leads changed no change!
Post by: JamesV6CDX on 15 March 2008, 00:40:43

compression test will tell you a lot more than the condition of the HG

It will tell you if the valves are sealing ok and moving OK, and will also give you an indication if the timing has slipped (unlikely in your case)

Also, a vacc test wouldn't hurt...

Title: Re: DIS pack and leads changed no change!
Post by: TheBoy on 15 March 2008, 08:20:59

Check for fault codes (and that EML is working).

As MDTM suggests, double check HT wiring for passenger bank - the DIS wiring is not as you may expect.

Title: Re: DIS pack and leads changed no change!
Post by: Andy B on 15 March 2008, 14:42:43

Quote

Quote

Quote

....

compression test will tell you wether the head gasket is ok...

Or burnt out valves  ::)

Is that economical to fix?

Depends who dos the work. My answer was a bit flippant really -  ::) -just giving an alternative to a blown HG if you had low compression. The last valves I bought were pattern parts  for a Hyundai & were about £15 for the 2, Hyundai wanted that each.