Important! : Engine management light

1. Jordy6969 Established Member Joined: Sep 2008 Sittingbourne, Kent Posts: 1161 My bike

   #1 16th October 2010, 21:10

   Hello,
   
   Right need some help, BASICALLY was driving down the motorway for around 5 minutes, then my engine management came on for about a minute, then went off, and then a minute later, low and behold it came back on and stayed on,
   
   There was no differences in the way the car was responding apart it felt like every so often when i would put the throttle down it would choke very slightly, and have been noticing that lately when i drive the Vtr from cold its very dogged and jerky and sometimes and on the odd occasion it would stall, however when warm its perfectly normal,
   
   Have any of you guys got any suggestion as to it could be, I have seemed to have this slight problem ever since i have installed the rallye inlet system, wondered if this could have anything to do with it maybe?
   
   cheers for reading, and thanks for the help
2. rey Saxperience Post Whore Joined: May 2006 Kent Posts: 8205 :(s)rac

   #2 16th October 2010, 21:15

   Dogged and jerky? So it hesitates yeah?
   
   Struggle on cold start or not?
   
   Use more petrol than usual?
   
   Simplest thing treacle would be to get a diagnostic test done.
   
   You didn't disturb any sensor wires when you did the inlet did you, like tug them to move them or move them to suit the rallye inlet did you? Could be something as simple as a loose connection
3. user_39461 Super Moderator Joined: Nov 2009 Cambridge(ish), UK. Posts: 10581 BMW 5x M50d.

   #3 16th October 2010, 22:11

   Could just be the cat on the way out. As someone else said above, get a diag. Cheap as chips. If you were nearer to me I'd do it for you.
4. rey Saxperience Post Whore Joined: May 2006 Kent Posts: 8205 :(s)rac

   #4 16th October 2010, 23:48

   True, could just be one of the lambda's on it's way out
5. Jordy6969 Established Member Joined: Sep 2008 Sittingbourne, Kent Posts: 1161 My bike

   #5 18th October 2010, 18:44

   and diagnostics would pick that up yes?
   
   yer hesitates in cold start
   
   however the light has gone off now,
   
   how much is a diagnostics though?
   
   

   Quote:

   Originally Posted by rey Dogged and jerky? So it hesitates yeah? Struggle on cold start or not? Use more petrol than usual? Simplest thing treacle would be to get a diagnostic test done. You didn't disturb any sensor wires when you did the inlet did you, like tug them to move them or move them to suit the rallye inlet did you? Could be something as simple as a loose connection

   Matt don't you remember that little machine you had when you plugged it into my car, the readings came out fine
6. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #6 18th October 2010, 18:55

   I`ll be interested to hear the outcome of this mines doing this as well.
   
   Steve.
7. Jordy6969 Established Member Joined: Sep 2008 Sittingbourne, Kent Posts: 1161 My bike

   #7 18th October 2010, 19:06

   yer well annoying, sometimes does it, sometimes it doesn't
8. user_46658 Saxperience Post Whore Joined: Aug 2010 Little Mill, South Wales Posts: 7547 Mondeo ST TDCI Saxo VTS

   #8 18th October 2010, 19:53

   I have similar on mine, happened while driving down the motorway too, put the diagnostic machine on it and suprise suprise it was the cat, so stainless steel next week with decat should sort that one out, id put money on it being the same thing
9. user_7076 Saxperience Post Whore Joined: Sep 2005 Milton Keynes Posts: 8504 Audi A1 S-Line, Mazda MX5 Kuro, Renault Clio 1.2,

   #9 18th October 2010, 20:17

   Where do you go to get this diag machine check done? How much did it set you back? I think i'll have to do the same as you man
10. rey Saxperience Post Whore Joined: May 2006 Kent Posts: 8205 :(s)rac

    #10 18th October 2010, 21:40

    Jord you had no eml light then, so nothing would show up.
11. Jordy6969 Established Member Joined: Sep 2008 Sittingbourne, Kent Posts: 1161 My bike

    #11 19th October 2010, 16:20

    yer but if its going to keep coming on or off then something must be up, plus I have no cat, have to see what happens
12. rey Saxperience Post Whore Joined: May 2006 Kent Posts: 8205 :(s)rac

    #12 19th October 2010, 16:48

    Yeah, faults develop over time, they aren't just always there.
    
    You need to get a diag test done, you wont know what the actual fault is until you get that done.
    
    Even if you haven't got the cat, you can still have a faulty lambda reading.
13. Jordy6969 Established Member Joined: Sep 2008 Sittingbourne, Kent Posts: 1161 My bike

    #13 24th October 2010, 21:13

    turns out it was the lambda sensor in the manifold
    
    bought a devil 4-2-1 manifold with a new lambda in it, fitted and now the car's perfect much to my liking
14. rey Saxperience Post Whore Joined: May 2006 Kent Posts: 8205 :(s)rac

    #14 24th October 2010, 21:51

    Good times, was gonna say I'm back thursday, woulda run a diag for you!
15. Jordy6969 Established Member Joined: Sep 2008 Sittingbourne, Kent Posts: 1161 My bike

    #15 26th October 2010, 13:25

    Quote:

    Originally Posted by rey Good times, was gonna say I'm back thursday, woulda run a diag for you!

    Cheers but I think its sorted apart from the manifold mount not lineing up completely right, It resting on the lwer strut and rattles loads, so annoying!
    
    Need to get it on hydraulic lifters and drill a bigger hole for the bolt