16v missfire!

1. Ali123 Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt

   #1 29th December 2013, 00:55

   right this is really starting to piss me off , basically my car decideds to misfire randomly, could be once in a week or could be about 5 times a day!
   when it does it if I boot it through low gears and high revs it clears and pulls as it should, then could be a matter of 5 mins till it does it again or could be a day later!
   
   what ive done is as it was doing it put a brand new known to be working coilpack on it and its the same
   also, got a fresh set of plugs in it today and put a new fuel filter too as I thought that could cause it as who knows how long that filter has been on for! , drove like a dream today , a lot smoother and drove so much nicer and fine all day! till about an hour ago it did it again!
   
   its seriously pissing me off now! any ideas people?
   
   
2. Ali123 Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt

   #2 29th December 2013, 00:59

   oh also say im sat on a motorway at high revs it wont do it, its only if im driving in low revs it'll start it off!
3. user_61517 Frequent Poster Joined: Sep 2012 canterbury Posts: 586 3/4 vtr turbo

   #3 29th December 2013, 01:28

   Could be an injector?
   
   Sent from my GT-I9300 using Tapatalk
4. Ali123 Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt

   #4 29th December 2013, 09:39

   But would that sort it's self out once I boot it?!
5. Ali123 Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt

   #5 29th December 2013, 16:28

   Anyone?!
6. marcusd Saxperience Post Whore Joined: Jan 2009 warrington Posts: 7551 posi blue mk2 2003 vtr

   #6 29th December 2013, 16:58

   mines doing same, got told could be lambda, so ive unplugged it to rule that out
7. Ali123 Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt

   #7 29th December 2013, 17:31

   I unplugged lambda sensors, but still the same
8. user_29491 Saxperience Forum Bum Joined: Dec 2008 Lancs Posts: 4124 JP4S'd R.

   #8 29th December 2013, 17:44

   loss of power / judders no matter how much revs you give?
   
   or
   
   Judder on part throttle/cruise then normal when increase revs?
9. Ali123 Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt

   #9 29th December 2013, 18:46

   Loss of power and judder through all revs, but when you rev it up in neutral seems to rev up fine , but web driving it sounds like a scoobarooo
10. Ali123 Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt

    #10 29th December 2013, 18:47

    But like I said if I boot it it'll clear it! It could clear it within a second of booting or it can take 5 mins of booting it around in a straight line to clear it
11. user_29491 Saxperience Forum Bum Joined: Dec 2008 Lancs Posts: 4124 JP4S'd R.

    #11 29th December 2013, 18:48

    EML flashing? Does sound like the coilpack, but you've changed that - but suppose it wasn't a new one so can't really rule it out
    
    IF the coilpack is a working one then will be worth trying crankshaft sensor - can pick em up for pennies so worth a try
12. Ali123 Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt

    #12 29th December 2013, 18:57

    Deffo not coilpack mate and was thinking that but it's the fact that if I boot it and it clears it
    Also forgot to mention , that if I leave it till it's cold then it's alright again till it decides to start running like a cunt again !
13. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

    #13 29th December 2013, 19:00

    Faulty lambda sensor,try unplugging it & go for a drive mate.
14. Ali123 Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt

    #14 29th December 2013, 19:01

    Have done mate, drive for about a month with it unplugged
15. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

    #15 29th December 2013, 19:17

    Try checking the alternator charging rate.
16. Ali123 Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt

    #16 29th December 2013, 19:21

    It's spot on mate , new alternator about a month ago and checked it with a voltmeter afterwards, it's perfect
17. mlawlan69 Saxperience Forum Bum Joined: Sep 2010 leeds Posts: 4389 MCS R53 S/C 16v furiooo

    #17 30th December 2013, 00:08

    check everything.
    
    failing that throw it in a garage and let the fuckers rot, hi ali.
18. Ali123 Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt

    #18 30th December 2013, 00:30

    its been doing my head in for ages! just cant get to the bottom of it, just don't fancy spending money on random bits hoping it'll cure it
    
    but hey der matt! <3
19. user_12874 Frequent Poster Joined: Dec 2006 London, England Posts: 734 Saxo VTS, Audi A6 Avant Quattro.

    #19 30th December 2013, 19:59

    Spark plugs?
    
    Take the throttle body off and give all the sensors a real good clean they will be covered in crap, clean up dry out and fit and reseal everything. If it doesn't work you've not lost anything and gained a little.
20. Ali123 Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt

    #20 30th December 2013, 20:03

    done all that already mate
21. user_12874 Frequent Poster Joined: Dec 2006 London, England Posts: 734 Saxo VTS, Audi A6 Avant Quattro.

    #21 30th December 2013, 20:15

    Could be a dodgy connection the loom somewhere.
22. kyle4256 Established Member Joined: Feb 2008 dundee Posts: 1844 saxo vts

    #22 30th December 2013, 20:16

    I'm guessing it's the injectors mate , I piston ring sticking sometimes could cause it have you done compression test ?
23. Ali123 Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt

    #23 30th December 2013, 20:33

    but im pretty sure a break in the loom wouldn't cure its self when I boot it
    and yep compression tested , between 165 and 170 across all 4 mate
24. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

    #24 30th December 2013, 21:01

    It must be a sensor then have you got any spare 1`s lying about?Or a spare fuel pump to eliminate that.
25. Ali123 Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt

    #25 30th December 2013, 21:23

    not really no mate, just some sensors off my old 8v engine that's it
    im thiniing poss fuel pump, but also trying to thing what sensors too!
26. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

    #26 30th December 2013, 21:27

    Map sensor,throttle position sensor might be 2 culprits.
27. user_61517 Frequent Poster Joined: Sep 2012 canterbury Posts: 586 3/4 vtr turbo

    #27 30th December 2013, 21:32

    Quote:

    Originally Posted by Ali123 but im pretty sure a break in the loom wouldn't cure its self when I boot it

    The injector itself may be partially blocked?
    Map sensor could cause this too.
    
    One way to check the spray pattern (try when its cold if this is when its at its worst)
    
    Unbolt the injector rail pull the injectors out the manifold/head but make sure the injectors are still in the rail. put some cardboard underneath the injectors and get someone to crank the engine over.
    You will see if one is faulty as it will have a shitty pattern or wont flow as much fuel as the others.
    
    Worth a try
28. Ali123 Saxperience Forum Bum Joined: May 2011 huddersfield Posts: 2635 ph3'd c2 gt

    #28 30th December 2013, 21:51

    Quote:

    Originally Posted by stevo67 Map sensor,throttle position sensor might be 2 culprits.

    i'll give those two a go too
    
    

    Quote:

    Originally Posted by vtr91 The injector itself may be partially blocked? Map sensor could cause this too. One way to check the spray pattern (try when its cold if this is when its at its worst) Unbolt the injector rail pull the injectors out the manifold/head but make sure the injectors are still in the rail. put some cardboard underneath the injectors and get someone to crank the engine over. You will see if one is faulty as it will have a shitty pattern or wont flow as much fuel as the others. Worth a try

    and I shall also give this a go if all else fails!