missfiring

1. tingaling Frequent Poster Joined: Jan 2011 derby Posts: 992 Gold mk2 vtr

   #1 14th July 2011, 18:01

   Hi all, I've got an 02 plate vtr and its missfiring but not a constant miss, it seems to be random and sometimes quite harshly. Also when stopped at traffic lights yesterday it started spluttering and cut out although it normally idles ok.
   
   just wondered if anyone has had the same problem or any idea what could be causing it, I'm thinking it could be something like an air leak as it isn't at a particular time every cycle?
   
   Any help is much appreciated, thanks for reading
2. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #2 14th July 2011, 19:37

   Does it misfire when it`s hot or cold?Sometimes when a saxo gets hot & the coil pack is near death that`s what can happen.
   
   Steve.
3. tingaling Frequent Poster Joined: Jan 2011 derby Posts: 992 Gold mk2 vtr

   #3 14th July 2011, 20:56

   To be honest I'm not sure but I can't recall it doing it straight after a cold start
4. tingaling Frequent Poster Joined: Jan 2011 derby Posts: 992 Gold mk2 vtr

   #4 15th July 2011, 13:42

   Well I've been out today 1st thing and iy does do it straight from cold start aswell as when warm, all help is appreciated, thanks
5. MC_ Infrequent Poster Joined: Oct 2011 Maidenhead Posts: 159 '99 MkII VTS

   #5 16th November 2011, 16:07

   Didn't wanna start a new thread so sorry to bump a mega old one but. My '53 VTR is doing exactly the same, it's totally random and sometime it's lust a little shudder other times I literally have to take my foot of the gas and dip the clutch to stop it. I've replaced the spark plugs and coil pack with no joy .. ideas? :/
6. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #6 16th November 2011, 16:10

   Try a compression test then go from there,as said it could be an air leak(vacuum pipe)
7. tingaling Frequent Poster Joined: Jan 2011 derby Posts: 992 Gold mk2 vtr

   #7 16th November 2011, 17:02

   Map sensor did it for me
8. MC_ Infrequent Poster Joined: Oct 2011 Maidenhead Posts: 159 '99 MkII VTS

   #8 16th November 2011, 19:12

   Quote:

   Originally Posted by tingaling Map sensor did it for me

   Which is the map sensor? Cause there's some thing bolted to the top of my coil pack that seems to be in bits. But neither my dad or I had any idea what it was.
9. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

   #9 16th November 2011, 19:25

   the thing bolted to the coilpack is just something to do with radio signal nothing to do with how the engine runs, map sensor is bolted onto the inlet manifold usually an oblong shape with a connector on the end.