Omega Owners Forum

Please login or register.

Login with username, password and session length
Advanced search  

News:

Please play nicely.  No one wants to listen/read a keyboard warriors rants....

Pages: [1]   Go Down

Author Topic: Not firing on all cylinders?  (Read 1662 times)

0 Members and 1 Guest are viewing this topic.

Eighth_dwarf

  • Junior Member
  • **
  • Offline Offline
  • Gender: Male
  • Brissol
  • Posts: 100
    • '97 2.5 CD Auto
    • View Profile
Not firing on all cylinders?
« on: 17 February 2010, 12:15:31 »
Had usual cam cover leak, changed gaskets, plugs and leads. Car had been hunting on tickover for a while which I attributed to plug wells full of oil.
Going along m4 it suddenly lost at least one cylinder, no fault codes so I assumed dispack blown. Changed dispack but still not firing right.

Any help appreciated!!!

Have plugged in "My Naff Code Reader" havd have live data if it will be of any help! if someone can tell me how to upload!
Logged
Daily drive     - 1997 2.5 CD Auto - 25-35 mpg
Weekend Fun - 2003 RX8 231      - 14-18 mpg

JamesV6CDX

  • Omega Queen
  • *****
  • Offline Offline
  • Gloucestershire/Buckinghamshire
  • Posts: 16640
    • Omega 3.2 Retail MV6 LPG
    • View Profile
Re: Not firing on all cylinders?
« Reply #1 on: 17 February 2010, 12:25:44 »
All plugs and leads OK?

If so - check for codes - and if no joy compression test it
Logged

Eighth_dwarf

  • Junior Member
  • **
  • Offline Offline
  • Gender: Male
  • Brissol
  • Posts: 100
    • '97 2.5 CD Auto
    • View Profile
Re: Not firing on all cylinders?
« Reply #2 on: 17 February 2010, 12:29:29 »
Plugs & Leads new, no codes stored.
Logged
Daily drive     - 1997 2.5 CD Auto - 25-35 mpg
Weekend Fun - 2003 RX8 231      - 14-18 mpg

JamesV6CDX

  • Omega Queen
  • *****
  • Offline Offline
  • Gloucestershire/Buckinghamshire
  • Posts: 16640
    • Omega 3.2 Retail MV6 LPG
    • View Profile
Re: Not firing on all cylinders?
« Reply #3 on: 17 February 2010, 12:30:37 »
Quote
Plugs & Leads new, no codes stored.

In that case - compression test it... I doubt it's a compression problem, but you obviously need to emiminate it...
Logged

Eighth_dwarf

  • Junior Member
  • **
  • Offline Offline
  • Gender: Male
  • Brissol
  • Posts: 100
    • '97 2.5 CD Auto
    • View Profile
Re: Not firing on all cylinders?
« Reply #4 on: 06 April 2010, 15:19:50 »
update....

finally got round to compression testing it and results are:

Cyl 1 - 110
Cyl 2 - 120
Cyl 3 - 110
Cyl 4 - 120
Cyl 5 - 110
Cyl 6 - 130

as all are around the same I guess not a compression problem.

what should I look at next? replace leads & plugs again? or is there another suspected cause?
Logged
Daily drive     - 1997 2.5 CD Auto - 25-35 mpg
Weekend Fun - 2003 RX8 231      - 14-18 mpg

henryd

  • Omega Lord
  • *****
  • Offline Offline
  • Gender: Male
  • west cornwall
  • Posts: 8806
  • VW Touareg R5 tdi Auto
    • View Profile
Re: Not firing on all cylinders?
« Reply #5 on: 06 April 2010, 15:22:52 »
its unlikely but it could be an injector playing up,but plugs and leads are the most likely cadidates
Logged
other rides 
  mk3 Volvo v70 2.0 Diesel ,Citroen C2, Pug 306 cabriolet
  Sterling elite trekker pikey wagon

Marks DTM Calib

  • Administrator
  • *****
  • Offline Offline
  • Gender: Male
  • West Bridgford
  • Posts: 34014
  • Git!
    • View Profile
Re: Not firing on all cylinders?
« Reply #6 on: 06 April 2010, 15:27:39 »
Have you connected the plug leads to the DIS correctly....as its not as obvious as you think i.e.

5-3-1
2-6-4
Logged

Eighth_dwarf

  • Junior Member
  • **
  • Offline Offline
  • Gender: Male
  • Brissol
  • Posts: 100
    • '97 2.5 CD Auto
    • View Profile
Re: Not firing on all cylinders?
« Reply #7 on: 06 April 2010, 15:37:51 »
99% sure as I checked, checked and rechecked as I was doing it but will make sure again now!
Logged
Daily drive     - 1997 2.5 CD Auto - 25-35 mpg
Weekend Fun - 2003 RX8 231      - 14-18 mpg

Entwood

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • North Wiltshire
  • Posts: 19566
  • My Old 3.2 V6 Elite (LPG)
    • Audi A6 Allroad 3.0 DTI
    • View Profile
Re: Not firing on all cylinders?
« Reply #8 on: 06 April 2010, 15:47:45 »
If the plug wells were full of oil it is posible the leads themselves have been damaged, hot oil and rubber don't sit well together ( no pun intended  :)  )
Logged

Eighth_dwarf

  • Junior Member
  • **
  • Offline Offline
  • Gender: Male
  • Brissol
  • Posts: 100
    • '97 2.5 CD Auto
    • View Profile
Re: Not firing on all cylinders?
« Reply #9 on: 06 April 2010, 15:50:42 »
leads are connected the correct way round. Next idea please!

That was the reason I replaced the plugs and leads, because of the cam cover gaskets going.
« Last Edit: 06 April 2010, 15:51:41 by Eighth_dwarf »
Logged
Daily drive     - 1997 2.5 CD Auto - 25-35 mpg
Weekend Fun - 2003 RX8 231      - 14-18 mpg

Eighth_dwarf

  • Junior Member
  • **
  • Offline Offline
  • Gender: Male
  • Brissol
  • Posts: 100
    • '97 2.5 CD Auto
    • View Profile
Re: Not firing on all cylinders?
« Reply #10 on: 08 April 2010, 13:21:11 »
so is it worth trying another set of leads and plugs or not? Would crank sensor cause it to run rough? i.e not sparking at correct time?
Logged
Daily drive     - 1997 2.5 CD Auto - 25-35 mpg
Weekend Fun - 2003 RX8 231      - 14-18 mpg

Kevin Wood

  • Global Moderator
  • *****
  • Offline Offline
  • Gender: Male
  • Alton, Hampshire
  • Posts: 36417
    • Jaguar XE 25t, Westfield
    • View Profile
Re: Not firing on all cylinders?
« Reply #11 on: 08 April 2010, 13:51:34 »
Quote
so is it worth trying another set of leads and plugs or not? Would crank sensor cause it to run rough? i.e not sparking at correct time?

It could, but you'd almost certainly have a code 19 stored.

How does the misfire manifest itself? Is it there all the time, just when cold, just when hot?

At idle, at high rpm? Under light load, when accelerating hard?

If it's always there and ignition system is fine, check for a fuel injector with a lead off perhaps?

Kevin
Logged
Tech2 services currently available. See TheBoy's price list: http://theboy.omegaowners.com/

Eighth_dwarf

  • Junior Member
  • **
  • Offline Offline
  • Gender: Male
  • Brissol
  • Posts: 100
    • '97 2.5 CD Auto
    • View Profile
Re: Not firing on all cylinders?
« Reply #12 on: 08 April 2010, 14:07:13 »
Misfire is there all the time, smell of petrol when starting from cold so assuming a cyl is not firing.

Is a lumpy tickover and real lack of power when accelerating. Once it has droped in top at 60ish when you accelerate you can feel the serious unbalance of the engine where somethings is not fireing, if you kick it down it will slowly accel and not feel as unbalanced.
Logged
Daily drive     - 1997 2.5 CD Auto - 25-35 mpg
Weekend Fun - 2003 RX8 231      - 14-18 mpg

Kevin Wood

  • Global Moderator
  • *****
  • Offline Offline
  • Gender: Male
  • Alton, Hampshire
  • Posts: 36417
    • Jaguar XE 25t, Westfield
    • View Profile
Re: Not firing on all cylinders?
« Reply #13 on: 08 April 2010, 15:03:44 »
It does sound ignition related to me. Can you pull the spark plugs out after a run and see if any are wet? That might at least narrow it down to a single cylinder.

Kevin
Logged
Tech2 services currently available. See TheBoy's price list: http://theboy.omegaowners.com/

Eighth_dwarf

  • Junior Member
  • **
  • Offline Offline
  • Gender: Male
  • Brissol
  • Posts: 100
    • '97 2.5 CD Auto
    • View Profile
Re: Not firing on all cylinders?
« Reply #14 on: 12 April 2010, 10:58:22 »
Problem solved. Replaced leads and plugs again (found one plug had cracked when i took it out) and crank sensor.
Logged
Daily drive     - 1997 2.5 CD Auto - 25-35 mpg
Weekend Fun - 2003 RX8 231      - 14-18 mpg
Pages: [1]   Go Up
« previous next »
 

Page created in 0.012 seconds with 16 queries.