Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: Shep on 03 April 2009, 10:51:38

Title: Uneven Tickover - backfiring and 'popping'
Post by: Shep on 03 April 2009, 10:51:38

Any help would be much appreciated! - I have recently bought a 1997 Omega 2.5i V6 with LPG.
The tickover seems very lumpy and when accelerating from a stand still the exhaust 'pops!' and backfires before the car finally decides to go!
Also the car seems generally sluggish with disappointing acceleration - mpg is shown as around 17mpg.
The car came with receipts showing it has had a full service, new plugs and new HT leads in the last 2000 miles.

Thanks!

Title: Re: Uneven Tickover - backfiring and 'popping'
Post by: matt bolton on 03 April 2009, 11:25:05

Has somebody sold my car while I wasn't looking LOL  ;D  I have same problem and am still trying to figure it out
Good luck as I am rapidly losing my hair trying to sort this out but I don't know where to start occasional eml but all in all just a. It sluggish and occasional misfires and similar symptoms to yourself

Title: Re: Uneven Tickover - backfiring and 'popping'
Post by: feeutfo on 03 April 2009, 11:31:13

got to start with the paper clip test i reckon. Follow the link post the fault codes you find.
http://www.omegaowners.com/forum/YaBB.pl?num=1189022687

Title: Re: Uneven Tickover - backfiring and 'popping'
Post by: Shep on 04 April 2009, 09:14:45

I've just done the paper-clip test - It's showing
12
19
12
Anyone help with what that means? :-/

Title: Re: Uneven Tickover - backfiring and 'popping'
Post by: Cameron on 04 April 2009, 14:02:31

Well 12 are just start & stop of paperclip test.

19 is crank sensor but that wouldn't normally cause misfiring, it would simply stop running.

Title: Re: Uneven Tickover - backfiring and 'popping'
Post by: RobG on 04 April 2009, 16:23:14

Also have you checked the plugwells for oil :question

Title: Re: Uneven Tickover - backfiring and 'popping'
Post by: Dave-C on 04 April 2009, 16:25:17

Air leak on intake !

Title: Re: Uneven Tickover - backfiring and 'popping'
Post by: LFF64 on 04 April 2009, 18:59:15

I had similar problems when my EGR valve came apart may be worth checking that  :y