Weird problem, 16v argh!

1. Adamsaxp Newbie Joined: May 2014 Norfolk Posts: 15 106 gti Saxo vtr

   #1 5th October 2015, 13:44

   Hello all,
   Hoping you can help im literally stuck not sure what to do now!
   3 plug 16V
   Basically the car with idle perfect 100%.
   Lightly touch the throttle (10%?) hold it there and itll chug, missfire ect.
   Apply more throttle and it will clear and be fine.
   No fault cods are showing on diagnostics.
   Throttle bodie cleaned, ICV cleaned, tenp sesnor new, crank sensor cleaned, map sensor cleaned, new lambda sensor too.
   Just not sure what to do now ive looked on every forum too!
   Any help would be greatly apprechiated.
2. Mickswan Saxperience Forum Bum Joined: Apr 2013 Jarrow Posts: 4022 2003 Icelandic Grey 16v VTR 1991 Daihatsu GTti

   #2 5th October 2015, 14:34

   New spark plug
3. Adamsaxp Newbie Joined: May 2014 Norfolk Posts: 15 106 gti Saxo vtr

   #3 5th October 2015, 19:52

   Done that.
   Tried another throttle body with all sensors, map sensor and coil pack this evening still the same!
4. Mickswan Saxperience Forum Bum Joined: Apr 2013 Jarrow Posts: 4022 2003 Icelandic Grey 16v VTR 1991 Daihatsu GTti

   #4 5th October 2015, 19:53

   Coil pack? The heat can fuck them up
5. Adamsaxp Newbie Joined: May 2014 Norfolk Posts: 15 106 gti Saxo vtr

   #5 5th October 2015, 19:56

   Ive tried two now :/
6. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #6 5th October 2015, 20:03

   What about when the engine is hot/cold does that change things?
7. tarzan Frequent Poster Joined: Apr 2010 Lurgan Posts: 767 2001 black saxo furio 2001 black saxo vts

   #7 5th October 2015, 21:03

   have you the second lambda sleeved/ disconnected?
8. Adamsaxp Newbie Joined: May 2014 Norfolk Posts: 15 106 gti Saxo vtr

   #8 5th October 2015, 21:25

   Does it when hot or cold!
   
   And yes the second is disconnected always has been since i got the car.
9. welshpug Saxperience Forum Bum Joined: Jul 2010 South Wales Posts: 3078 ZX 16v, 205 GTI, 309 Goodwood, 405 MI16.

   #9 6th October 2015, 06:18

   Are you fitting used parts?
10. Adamsaxp Newbie Joined: May 2014 Norfolk Posts: 15 106 gti Saxo vtr

    #10 6th October 2015, 06:27

    Yes my friend has same year car.
11. Phaeton Regular Poster Joined: Aug 2015 Sunny Worksop Posts: 441 1989 MK1 MR2 with V6 3.0L Camry engine

    #11 6th October 2015, 07:37

    What happens when you put your parts back on his car?
12. Adamsaxp Newbie Joined: May 2014 Norfolk Posts: 15 106 gti Saxo vtr

    #12 6th October 2015, 08:54

    Didnt try if im honest.
    Only sensor that hasnt been tried is the crabk sensor but would that wven cause these syptoms?
13. rey Saxperience Post Whore Joined: May 2006 Kent Posts: 8205 :(s)rac

    #13 6th October 2015, 09:09

    You checked injectors/injector loom?
    
    Had a similar issue on my old S, the loom was fucked.

    1 user thanked this post: tiger1983
14. Adamsaxp Newbie Joined: May 2014 Norfolk Posts: 15 106 gti Saxo vtr

    #14 6th October 2015, 09:42

    How do i go about test that pal? Thanks for your reply
15. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

    #15 6th October 2015, 10:28

    Quote:

    Originally Posted by Adamsaxp Didnt try if im honest. Only sensor that hasnt been tried is the crabk sensor but would that wven cause these syptoms?

    It could yes.
16. tiger1983 Regular Poster Joined: Aug 2014 Posts: 279

    #16 6th October 2015, 10:43

    Quote:

    Originally Posted by rey You checked injectors/injector loom? Had a similar issue on my old S, the loom was fucked.

    Sorry to jump in here but any tips on testing the loom, I've had a similar problem, so could help us both here.
    
    Sent from my GT-I9505 using Tapatalk
17. rey Saxperience Post Whore Joined: May 2006 Kent Posts: 8205 :(s)rac

    #17 6th October 2015, 11:38

    Mine didn't need to be tested, as it was quite clearly shagged.
    
    IIRC the loom runs under the inlet manifold cover, so need to pop that off to see.
    
    If you've got a continuity tester, you can test at either end of the loom section to see if there's a wire break.

    1 user thanked this post: tiger1983
18. Adamsaxp Newbie Joined: May 2014 Norfolk Posts: 15 106 gti Saxo vtr

    #18 6th October 2015, 11:45

    I didnt realise that i thought the crank sensor either wirked or didnt!
    Other than crank sensor i guess im looking at ecu fault..
19. tiger1983 Regular Poster Joined: Aug 2014 Posts: 279

    #19 6th October 2015, 14:28

    Quote:

    Originally Posted by rey Mine didn't need to be tested, as it was quite clearly shagged. IIRC the loom runs under the inlet manifold cover, so need to pop that off to see. If you've got a continuity tester, you can test at either end of the loom section to see if there's a wire break.

    Tried that, I've got continuity along all wires but a split in one of the rubber angles so may replace mine anyway
    

    Quote:

    Originally Posted by Adamsaxp I didnt realise that i thought the crank sensor either wirked or didnt! Other than crank sensor i guess im looking at ecu fault..

    Crank sensor can play a dodgy part. My injectors were firing weird, cylinders 1 2 3 were 2ms but cylinder 4 jumped to 17ms at times, changed the crank and everything evened out again...crank will control spark aswell
    
    Sent from my GT-I9505 using Tapatalk
20. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

    #20 6th October 2015, 14:40

    The crank sensor takes a reading from the flywheel,then converts it to a signal.Which in turn is fed to the coil pack.
21. rey Saxperience Post Whore Joined: May 2006 Kent Posts: 8205 :(s)rac

    #21 6th October 2015, 18:16

    Just to add, I also had crank sensor issues.
    
    Turned out the sensor was faulty, and again, the wires leading to the plug were damaged and needed to be replaced.
22. Adamsaxp Newbie Joined: May 2014 Norfolk Posts: 15 106 gti Saxo vtr

    #22 7th October 2015, 06:18

    Cut out last night and instantly restarted with turn of the key.
    So confused
23. Adamsaxp Newbie Joined: May 2014 Norfolk Posts: 15 106 gti Saxo vtr

    #23 8th October 2015, 00:38

    Ok so fuel pump hasnt cured it. So the list is;
    Plugs
    Coil pack
    Map sensor
    Crank sensor
    Tps
    Icv
    Air temp
    Lambda sensor
    Fuel pump
    Fuel filter
    Left battery off over night
    No air leaks
24. tiger1983 Regular Poster Joined: Aug 2014 Posts: 279

    #24 9th October 2015, 17:44

    Check compression, injectors, timing. I've got exact same problem but found an injector that's a bit dodgy and it broke after I wobbled it so got a replacement set on the way but my next check will be my timing setup
    
    Sent from my GT-I9505 using Tapatalk
25. jonshepherd L-plater Joined: Nov 2010 Southampton Posts: 62 Mk2 Saxo VTS

    #25 2nd November 2015, 11:20

    Is it definitley misfiring or is it is fueling problem?
    
    Air leak? (Intake system)