Engine cranking, sparking, but ....

  1. Saxperience Post Whore Joined: Dec 2002 United Kingdom Posts: 8390
    #1
    After a big rebuild, went to start the mrs 106 GTi today. Cranks nicely, and the spark plugs are firing ok, fuel pump is priming. Not firing though. Inertia switch definitely depressed. Cam timing was triple checked before the covers went back on.

    Im sure the fuel lines are the right way round as one is angled and thats the only way youre getting the inner one on.

    Am I right in thinking that if the spark plugs are firing the ecu isnt locked and the crank sensor is ok? The ecu etc is all original to the car so Im pretty certain it shouldnt have locked, just want to rule out as many things as possible.

    When reassembling eveerything, I noticed one of the pins was bent on the 3-pin green connector for the injector loom. When I took the spark plugs out after trying to start it they didnt smell at all of petrol: that was despite me cranking it without the coil pack connected to circulate the oil, but wih the injectors still connected.

    In short, the car ran perfectly beforehand (well, blown head gasket but otherwise fine) so Im assuming the problem to be the injector loom (razor of Occam and all that). Anyone think of anything else that might cause those symptoms though?

    Cheers
  2. Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182
    #2
    Are the Injectors firing mate? Mine did something similar until I changed them one was dud. Wouldn't even run on three either for some reason


    Sent from my iPhone using Tapatalk
  3. Saxperience Post Whore Joined: Dec 2002 United Kingdom Posts: 8390
    #3
    The car was running fine until it was stripped down. All parts stored carefully and in clean cupboards so assume the injectors themselves would be ok. But if youve had something similar it doss seem to be pointing towards injectors/loom
  4. Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182
    #4
    Sounds like the aren't firing to me, bung some easy start through it see if it's tries to go. Or better yet flip the rail out and crank it over with the injectors still in. see if they fire


    Sent from my iPhone using Tapatalk
  5. Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B
    #5
    first things first

    whip the fuel pipes off in the bay and stick them in a bottle.. crank it over and see if youve got fuel to the rail.. see which one is the feed and put it where it should go

    if youve got fuel.. pull the injectors out and try firing them over into a oil drip try or something.. if no fuel then you know your injectors arent releasing

    it sounds like its gonna be your injector loom
  6. Saxperience Post Whore Joined: Dec 2002 United Kingdom Posts: 8390
    #6
    Swapped the injector loom annnnnnnd...

    Fired up straight away. Cheers for the input chaps.
    1 user thanked this post:
  7. Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182
    #7
    nice easy fix!
  8. Saxperience Forum Bum Joined: Mar 2009 Morpeth Posts: 2539 BMW 116d Regional Toner Sales Edition
    #8
    Wheeyyyyyy