loss of power

1. marcusd Saxperience Post Whore Joined: Jan 2009 warrington Posts: 7551 posi blue mk2 2003 vtr

   #1 13th February 2014, 11:47

   ok cars had replacement fuel pump fitted, primes everytime you turn key, been serviced so plugs and fuel filter changed, but still getting the slight loss of power and the jolting juddering symptoms.
   it was a lot worse before fuel pump as it would lose power and shake and jolt the whole car violently before regaining normal functions for a while???
   
   whats next to check??
2. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #2 13th February 2014, 12:35

   Only thing I can think of is an intermittent injector problem,try swapping the injectors around.
3. marcusd Saxperience Post Whore Joined: Jan 2009 warrington Posts: 7551 posi blue mk2 2003 vtr

   #3 13th February 2014, 12:48

   Could it be a map sensor?
   
   And how easy are injectors to get to? And test?
4. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #4 13th February 2014, 14:36

   I would not like to say with the map sensor,as regards the injectors they`re easy to remove.You need to remove the injector rail then unclip each injector.Someone like blackie or gandii would know better as regards testing them mate,but to do them properly checking the flow rate etc they need professionally testing.
5. marcusd Saxperience Post Whore Joined: Jan 2009 warrington Posts: 7551 posi blue mk2 2003 vtr

   #5 13th February 2014, 14:48

   Ok I'll wait for my Haynes too arrive and see how to remove injectors.
6. Gandi699 Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182

   #6 13th February 2014, 14:53

   Its really easy, remove any breather pipework for brake vacuum or vapour canister. This Can be removed or pushed out of the way depending on the inlet design you have. Off with the coil pack (2 bolts), off with the throttle cable holder (1 bolt) and unhitch cable from the throttle butterfly. Off with the two bolts that secure the fuel rail to the head and then pull, then out come the injectors. Be careful pulling them out so you dont lose the rubber seals and pintel caps. Injectors are secured to the rail by a metal clip each.
   
   As regards to testing them properly, its not something you can do at home really but you could always try cleaning them with some brake cleaner and if you feel brave enough (its not that bad really) turn the engine with the injectors spraying against some card and see if they all fire off or if ones substancially weaker but as your problem comes and goes its unlikely to be that.
   If you can identify which cylinder is causing the problem, then swap a "good" injector to that position from another one. Personally if it were me i'd invest or borrow a different set and see how you get on with those
7. marcusd Saxperience Post Whore Joined: Jan 2009 warrington Posts: 7551 posi blue mk2 2003 vtr

   #7 13th February 2014, 16:04

   So as a second opinion, would you day it's a faulty injector or another problem totally?
   
   Read a few threads bout it poss being temp sensor, or lambda or map sensor?
8. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #8 13th February 2014, 16:24

   Quote:

   Originally Posted by marcusd So as a second opinion, would you day it's a faulty injector or another problem totally? Read a few threads bout it poss being temp sensor, or lambda or map sensor?

   Temp sensor usually affects cold starting from what i`ve heard mate.
9. noodlearm Newbie Joined: Feb 2014 Posts: 4

   #9 13th February 2014, 16:32

   could be a lose connection to the fuel pump
10. Pricklep Saxperience Hardcore! Joined: Mar 2008 Posts: 31279 Citroen Saxo VTS, S60 D5

    #10 13th February 2014, 17:02

    pull the rail out and see if they injectors pulse (spray fuel)
11. marcusd Saxperience Post Whore Joined: Jan 2009 warrington Posts: 7551 posi blue mk2 2003 vtr

    #11 13th February 2014, 17:06

    So pull apart and then turn engine on?
12. user_39461 Super Moderator Joined: Nov 2009 Cambridge(ish), UK. Posts: 10581 BMW 5x M50d.

    #12 13th February 2014, 17:32

    What caused the faulty fuel pump? Running out of fuel at some point? Could be a dodgy injector as above - might have some shit in it that the filter didn't grab.
13. marcusd Saxperience Post Whore Joined: Jan 2009 warrington Posts: 7551 posi blue mk2 2003 vtr

    #13 13th February 2014, 18:14

    No idea I just swapped it out for a known working one to rule it out really, trouble is I have now run out of time off to do it all. So if I was to buy a known working set of injectors and put them on and run Car if problem goes away it was that? But till I get my Haynes back can't see how to remove yet
14. Gandi699 Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182

    #14 13th February 2014, 18:22

    I'm sure there's going to be a guide on here to do it. You can get the injectors out of a vtr in under ten minutes and that includes having a cuppa first!
    Ecu temp sensors are cheap try that next if this doesn't fix it
    
    
    Sent from my iPhone using Tapatalk
15. marcusd Saxperience Post Whore Joined: Jan 2009 warrington Posts: 7551 posi blue mk2 2003 vtr

    #15 14th February 2014, 10:05

    got a set being sent to me and the fuel rail off working car, so will try once they arrive