Plugged in.. nothing?!

1. lhessey Infrequent Poster Joined: Dec 2011 Newport Posts: 207 Furio 1.4, mk2 VTR

   #1 17th January 2012, 20:33

   I ran my car on a professional fault code reader today at college, (new piece of kit tutor loves it) to try find out what the shuddering put put put from the exhaust is.. Nothing! no fault codes at all, checked engine on oscilloscope for any abnormalities in each cylinder its almost a perfect straight line.. where is this tiny misfire coming from?!
2. DundeeUnited Established Member Joined: Nov 2010 Invergowrie Posts: 1006 Saxo VTR

   #2 17th January 2012, 20:35

   Quote:

   Originally Posted by lhessey I ran my car on a professional fault code reader today at college, (new piece of kit tutor loves it) to try find out what the shuddering put put put from the exhaust is.. Nothing! no fault codes at all, checked engine on oscilloscope for any abnormalities in each cylinder its almost a perfect straight line.. where is this tiny misfire coming from?!

   mines is doing the exact same, mine is missing a mount for the middle box so it just bounces the exhaust up and down. could be an engine mount i heard someone say but i doubt it
3. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #3 17th January 2012, 20:38

   Try another coil pack off another same spec saxo.
4. lhessey Infrequent Poster Joined: Dec 2011 Newport Posts: 207 Furio 1.4, mk2 VTR

   #4 17th January 2012, 20:39

   im pretty sure its coming from in the engine though.. if you listen too the exhaust it "put puts" misfire basically.. and when im sat in traffic i can feel it going "put" sorta of a vibration..
5. lhessey Infrequent Poster Joined: Dec 2011 Newport Posts: 207 Furio 1.4, mk2 VTR

   #5 17th January 2012, 20:39

   Quote:

   Originally Posted by stevo67 Try another coil pack off another same spec saxo.

   Wouldnt a coil show up on the fault code reader?
6. lhessey Infrequent Poster Joined: Dec 2011 Newport Posts: 207 Furio 1.4, mk2 VTR

   #6 17th January 2012, 20:40

   Oh, if it helps it doesnt really do it until it warms up
7. coleman258 Established Member Joined: Nov 2008 Eastbourne Posts: 2474 Astra van daily Black Saxo VTR 16v'd kent PT51

   #7 17th January 2012, 20:40

   engine sounds like it's running rough? sounds to me like it's misfiring.
8. coleman258 Established Member Joined: Nov 2008 Eastbourne Posts: 2474 Astra van daily Black Saxo VTR 16v'd kent PT51

   #8 17th January 2012, 20:41

   Quote:

   Originally Posted by lhessey Oh, if it helps it doesnt really do it until it warms up

   That sounds like temperature sensor, but i didn't think they made it run that bad if it was faulty.
9. lhessey Infrequent Poster Joined: Dec 2011 Newport Posts: 207 Furio 1.4, mk2 VTR

   #9 17th January 2012, 20:42

   When you tested the temp sensor on the diagnostic computer it came up as being fine haha, see why im so irritated by it?
10. lhessey Infrequent Poster Joined: Dec 2011 Newport Posts: 207 Furio 1.4, mk2 VTR

    #10 17th January 2012, 20:42

    we* sorry
11. DundeeUnited Established Member Joined: Nov 2010 Invergowrie Posts: 1006 Saxo VTR

    #11 17th January 2012, 20:44

    it will be coil pack mate, because my saxo misfires when it wants to, about a week ago if you floored it or put strain on the engine, the engine would judder and em light would come on, its been fine ever since but when you look under car the exhaust just bounces up and down lol, as comical as it is, it is quite irritating
12. coleman258 Established Member Joined: Nov 2008 Eastbourne Posts: 2474 Astra van daily Black Saxo VTR 16v'd kent PT51

    #12 17th January 2012, 20:45

    A code reader will only know there is a fault if the engine managent light is on normally, so if that isn't on then that is why it didnt come up.
13. lhessey Infrequent Poster Joined: Dec 2011 Newport Posts: 207 Furio 1.4, mk2 VTR

    #13 17th January 2012, 20:46

    Quote:

    Originally Posted by DundeeUnited it will be coil pack mate, because my saxo misfires when it wants to, about a week ago if you floored it or put strain on the engine, the engine would judder and em light would come on, its been fine ever since but when you look under car the exhaust just bounces up and down lol, as comical as it is, it is quite irritating

    Mine hasnt misfired under load as of yet but the vibration and the noise from the exhaust seems to be slowly getting worse haha, i'll try another coil pack i guess
14. DundeeUnited Established Member Joined: Nov 2010 Invergowrie Posts: 1006 Saxo VTR

    #14 17th January 2012, 20:47

    Quote:

    Originally Posted by coleman258 A code reader will only know there is a fault if the engine managent light is on normally, so if that isn't on then that is why it didnt come up.

    true, when i plugged mine in at my mates, it came up with nothing, i knew what it was anyway but wanted to have it confirmed,it depends how severe it is also,
15. lhessey Infrequent Poster Joined: Dec 2011 Newport Posts: 207 Furio 1.4, mk2 VTR

    #15 17th January 2012, 20:48

    Quote:

    Originally Posted by coleman258 A code reader will only know there is a fault if the engine managent light is on normally, so if that isn't on then that is why it didnt come up.

    I was told that code readers work on if the ECU stores the fault 3 times the light comes on and if it isnt 3 times it still stores it but doesnt put the light on am i correct?
16. DundeeUnited Established Member Joined: Nov 2010 Invergowrie Posts: 1006 Saxo VTR

    #16 17th January 2012, 20:48

    Quote:

    Originally Posted by lhessey Mine hasnt misfired under load as of yet but the vibration and the noise from the exhaust seems to be slowly getting worse haha, i'll try another coil pack i guess

    my exhaust got fucked because of it today, the middle box has came away from the cat because of it
17. lhessey Infrequent Poster Joined: Dec 2011 Newport Posts: 207 Furio 1.4, mk2 VTR

    #17 17th January 2012, 20:50

    If you know what it is why're you not fixing it haha
18. lhessey Infrequent Poster Joined: Dec 2011 Newport Posts: 207 Furio 1.4, mk2 VTR

    #18 17th January 2012, 20:53

    Another thing about it, it stutters and stuff when its warm only but when i first start it in the morning if i tap the throttle a few times quickly the car shudders and misfires so bad it stalls sometimes? dont know if that is related or not
19. DundeeUnited Established Member Joined: Nov 2010 Invergowrie Posts: 1006 Saxo VTR

    #19 17th January 2012, 20:58

    Quote:

    Originally Posted by lhessey Another thing about it, it stutters and stuff when its warm only but when i first start it in the morning if i tap the throttle a few times quickly the car shudders and misfires so bad it stalls sometimes? dont know if that is related or not

    its clearly related, i bet my 2pence worth its the coil pack,
    
    not got money to fix it just now

    1 user thanked this post: lhessey
20. lhessey Infrequent Poster Joined: Dec 2011 Newport Posts: 207 Furio 1.4, mk2 VTR

    #20 17th January 2012, 21:01

    Quote:

    Originally Posted by DundeeUnited its clearly related, i bet my 2pence worth its the coil pack, not got money to fix it just now

    Okay buddy thankyou, i'll try a coilpack
21. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

    #21 17th January 2012, 22:15

    Quote:

    Originally Posted by lhessey im pretty sure its coming from in the engine though.. if you listen too the exhaust it "put puts" misfire basically.. and when im sat in traffic i can feel it going "put" sorta of a vibration..

    Well it will be because a dodgy/faulty coil pack will make the engine misfire & transmit the put,put noise you mention to the exhaust.