Missfire

1. karlos_vtr Infrequent Poster Joined: Sep 2009 swansea Posts: 136 Silver Mk2 Saxo Vtr

   #1 9th June 2010, 19:03

   Ive got a mk 2 vtr which is idling fine but as soon as you build the rev's it missfires constantly. Ive checked the plugs which i renewed a month ago and are fine, changed the fuel filter and the air filter is clean.
   Can anyone shed some light on this for me as its been off the road for about 3 days now and it's driving me spare.
   Thanks in advance
2. karlos_vtr Infrequent Poster Joined: Sep 2009 swansea Posts: 136 Silver Mk2 Saxo Vtr

   #2 9th June 2010, 20:19

   Can anyone help at all or is it a diagnostics machine?
3. McGuire86 Saxperience Post Whore Joined: Mar 2009 Cornwall Posts: 5658 '08 Civic Type R GT FN2

   #3 9th June 2010, 22:08

   coilpack ?
4. user_28622 Established Member Joined: Nov 2008 West Sussex, Worthing Posts: 1671 Golf TDI 130

   #4 9th June 2010, 22:11

   Loose injectors ? I had this problem at one stage could be fine one minute, then next missing
5. stevyj Regular Poster Joined: May 2010 skipton Posts: 401 metro rio grande pug 306 dt corsa 8v sri tuned

   #5 9th June 2010, 23:00

   try reving it slowly to see if the revs get higher without it misfiring. if it does maybe fuel supply problem sensor.
6. j_a_lyons Regular Poster Joined: May 2010 Manchester Posts: 396 Vauxhall Astra SRI 3 door 1.8 with XP black Furio

   #6 9th June 2010, 23:56

   Mine was misfiring not long ago and I found out it was the ignition coil. It also happened on my clio and again was the ignition coil. Might be worth replacing, you can get them for about £50 - £60
7. Chico999 Saxperience Forum Bum Joined: Sep 2007 Dunfermline Posts: 2814 2000 Wicked Red VTS

   #7 10th June 2010, 01:14

   Try taking off the coil pack and spraying the insides with WD40. It worked well for me!
8. karlos_vtr Infrequent Poster Joined: Sep 2009 swansea Posts: 136 Silver Mk2 Saxo Vtr

   #8 10th June 2010, 13:31

   Cheers guys im gona try spraying wd-40 in the ends of the coil pack see if that has an effect first! I just noticed there is a tapping/ticking noise by the inlet manifold would this be a sign of a loose injector maybe? Thanks again
9. karlos_vtr Infrequent Poster Joined: Sep 2009 swansea Posts: 136 Silver Mk2 Saxo Vtr

   #9 10th June 2010, 13:59

   Right ive tryed spraying the coil pack with wd-40 but it hasnt done anything. When i rev the engine up progressively it starts to missfire about 2800rpm. Any ideas?
10. stevyj Regular Poster Joined: May 2010 skipton Posts: 401 metro rio grande pug 306 dt corsa 8v sri tuned

    #10 10th June 2010, 16:47

    fuel prssure regulator maybe? i am a noob