Omega Owners Forum

Please login or register.

Login with username, password and session length
Advanced search  

News:

Search the maintenance guides for answers to 99.999% of Omega questions

Pages: [1]   Go Down

Author Topic: No compression on cylinder 1?  (Read 1999 times)

0 Members and 1 Guest are viewing this topic.

blackviper90210

  • Omega Baron
  • *****
  • Offline Offline
  • Gender: Male
  • Bromsgrove, West Midlands
  • Posts: 2486
    • 03 3.2 Elite Saloon
    • View Profile
No compression on cylinder 1?
« on: 01 March 2012, 15:10:08 »
Hi all,

My dad has a facelift 2.5 cdx estate. He's been suffering bad tickover etc.

He's just had the car serviced, cam covers done and new HT leads. He's still suffering the same problem of rough idle & power. He's had it in a local garage he trusts and the mechanic tells him that:

There is no compression in cylinder 1, but No.3 is fine.
The spark is very weak on No. 1, rest are fine.

He believes that it is the dis pack and is sorting out a replacement.

Question:  What would cause the lack of compression?

TIA :y
Logged
AKA - Mr Bracket

Kevin Wood

  • Global Moderator
  • *****
  • Offline Offline
  • Gender: Male
  • Alton, Hampshire
  • Posts: 36417
    • Jaguar XE 25t, Westfield
    • View Profile
Re: No compression on cylinder 1?
« Reply #1 on: 01 March 2012, 15:15:32 »
If it has run with a misfire it is quite possible that cylinder 1 is suffering "bore wash" and not making good compression because the oil film on the cylinder bore has been washed of by excessive fuel. I would squirt a teaspoon of oil into the spark plug hole and try again.

It's not impossible that the coil pack has suffered due to the oil in the plug wells.
Logged
Tech2 services currently available. See TheBoy's price list: http://theboy.omegaowners.com/

Lazydocker

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • Woodbridge, Suffolk
  • Posts: 18848
  • Constantly Bullied by a certain Admin
    • View Profile
Re: No compression on cylinder 1?
« Reply #2 on: 01 March 2012, 15:16:09 »
I suppose it could be bore wash. But if compression is zero I'd suspect something more sinister than a dis pack :-\
Logged
Whatever it is... I didn't do it

blackviper90210

  • Omega Baron
  • *****
  • Offline Offline
  • Gender: Male
  • Bromsgrove, West Midlands
  • Posts: 2486
    • 03 3.2 Elite Saloon
    • View Profile
Re: No compression on cylinder 1?
« Reply #3 on: 01 March 2012, 15:18:35 »
So what would cause poor sparking on No.1 only?  Assuming the cylinder has suffered bore wash ???
Logged
AKA - Mr Bracket

Kevin Wood

  • Global Moderator
  • *****
  • Offline Offline
  • Gender: Male
  • Alton, Hampshire
  • Posts: 36417
    • Jaguar XE 25t, Westfield
    • View Profile
Re: No compression on cylinder 1?
« Reply #4 on: 01 March 2012, 15:24:16 »
Quote from: Lazydocker on 01 March 2012, 15:16:09
I suppose it could be bore wash. But if compression is zero I'd suspect something more sinister than a dis pack :-\

Agreed. If it really is Zero something is badly wrong. I read that compression was down. :y

Coil pack insulation break down around the turret for no.1 plug lead would cause that spark to be weak.
Logged
Tech2 services currently available. See TheBoy's price list: http://theboy.omegaowners.com/

Lazydocker

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • Woodbridge, Suffolk
  • Posts: 18848
  • Constantly Bullied by a certain Admin
    • View Profile
Re: No compression on cylinder 1?
« Reply #5 on: 01 March 2012, 15:25:36 »
Quote from: blackviper90210 on 01 March 2012, 15:18:35
So what would cause poor sparking on No.1 only?  Assuming the cylinder has suffered bore wash ???
Dis pack or lead ;) The diagnostic process is reasonably sound :y Did he try a drop of oil in the cylinder and re-test the compression to confirm bore wash?
Logged
Whatever it is... I didn't do it

blackviper90210

  • Omega Baron
  • *****
  • Offline Offline
  • Gender: Male
  • Bromsgrove, West Midlands
  • Posts: 2486
    • 03 3.2 Elite Saloon
    • View Profile
Re: No compression on cylinder 1?
« Reply #6 on: 01 March 2012, 15:26:10 »
Sorry if this is a dumb question....is a dispack & coil pack the same thing? :-\
Logged
AKA - Mr Bracket

Lazydocker

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • Woodbridge, Suffolk
  • Posts: 18848
  • Constantly Bullied by a certain Admin
    • View Profile
Re: No compression on cylinder 1?
« Reply #7 on: 01 March 2012, 15:27:26 »
Quote from: blackviper90210 on 01 March 2012, 15:26:10
Sorry if this is a dumb question....is a dispack & coil pack the same thing? :-\
Basically, yes :y

Could get more technical but no need here ;)
Logged
Whatever it is... I didn't do it

blackviper90210

  • Omega Baron
  • *****
  • Offline Offline
  • Gender: Male
  • Bromsgrove, West Midlands
  • Posts: 2486
    • 03 3.2 Elite Saloon
    • View Profile
Re: No compression on cylinder 1?
« Reply #8 on: 01 March 2012, 15:27:35 »
Quote from: Lazydocker on 01 March 2012, 15:25:36
Quote from: blackviper90210 on 01 March 2012, 15:18:35
So what would cause poor sparking on No.1 only?  Assuming the cylinder has suffered bore wash ???
Dis pack or lead ;) The diagnostic process is reasonably sound :y Did he try a drop of oil in the cylinder and re-test the compression to confirm bore wash?

Apparently yes, although it didn't last long. That's when he checked the spark. No.1 is very weak, yet on No.3 he had it roughly 3 inches away and it jumped across to the block no problem.
Logged
AKA - Mr Bracket

tigers_gonads

  • Omega Lord
  • *****
  • Offline Offline
  • Gender: Male
  • Kinston Upon Hull
  • Posts: 8610
  • Driving a Honda CR-V which doesn't smell of pee
    • Honda CR-V
    • View Profile
Re: No compression on cylinder 1?
« Reply #9 on: 01 March 2012, 15:30:57 »
Sounds like 2 problems to me  :-\

Sticking valve for the lack of compresion ?
Logged

blackviper90210

  • Omega Baron
  • *****
  • Offline Offline
  • Gender: Male
  • Bromsgrove, West Midlands
  • Posts: 2486
    • 03 3.2 Elite Saloon
    • View Profile
Re: No compression on cylinder 1?
« Reply #10 on: 01 March 2012, 15:38:16 »
Looks like problem found.... my dad just rang to say that the dis pack has corroded underneath and arching to the chassis!  New dis pack it is :(

Thanks guys :y
Logged
AKA - Mr Bracket

Lazydocker

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • Woodbridge, Suffolk
  • Posts: 18848
  • Constantly Bullied by a certain Admin
    • View Profile
Re: No compression on cylinder 1?
« Reply #11 on: 01 March 2012, 17:07:10 »
Yep. With a drop of oil compression returned so new dis pack should sort it nicely :y
Logged
Whatever it is... I didn't do it

Marks DTM Calib

  • Administrator
  • *****
  • Offline Offline
  • Gender: Male
  • West Bridgford
  • Posts: 34012
  • Git!
    • View Profile
Re: No compression on cylinder 1?
« Reply #12 on: 01 March 2012, 18:08:22 »
If its DIS pack then the spark would be down on 1 and 4....
Logged

blackviper90210

  • Omega Baron
  • *****
  • Offline Offline
  • Gender: Male
  • Bromsgrove, West Midlands
  • Posts: 2486
    • 03 3.2 Elite Saloon
    • View Profile
Re: No compression on cylinder 1?
« Reply #13 on: 01 March 2012, 19:24:43 »
Should find out tomorrow. The garage have ordered a dispack and is being delivered tomorrow, so fingers crossed that's the last of the gremlins for my dad :-X
Logged
AKA - Mr Bracket
Pages: [1]   Go Up
« previous next »
 

Page created in 0.067 seconds with 17 queries.