SERIOUS overfueling

  1. Saxperience Forum Bum Joined: Nov 2010 England Posts: 3423
    #1
    So i'm getting 170 miles to £50 of fuel.. Normal motorway driving in my VTR @75Mph.

    I'm popping like mad and my exhaust goes BANG. Numerous people have told me my exhaust is on fire (Just after it goes bang, so its obviously a flame) and the car struggles to idle and when it does, it stinks of petrol.

    The EML light is on which is a Lambda Sensor (Checked out by Beaniemoo) but only recently its started over fuelling. I can't see why the EML has been on for a few weeks now yet only in the last few weeks its srsly overfueling.

    I have a hunch maybe it could be a injector sensor problem so its injecting more fuel.

    Thanks
  2. Saxperience Post Whore Joined: Jul 2010 Morley, Leeds Posts: 8469 Civic ep3 type r powered by TDI NORTH
    #2
    When beniemoo checked the lambda as it replaced or just the fault thrown up on the ecu?

    Mine failed the mot last week because the emissions were sky high and throwing a flame out the back Was also using massive amounts of fuel. So we changed the lambda and run some fuel system cleaner on a long run and flew through the emissions test and the petrol consumption seems to be back to normal too.
  3. Established Member Joined: Mar 2010 Basildon, Essex Posts: 1042 Citroen AX VTS
    #3
    The lambda is what tells the ecu how much fuel to put in. If it reads the afr as rich it will tell the ecu to put less fuel in and vice versa

    If the lambda was on its way out then it's only gonna get worse and that's why the problem is getting worse

    Prob be an idea to replace the lambda sensor
  4. Saxperience Post Whore Joined: May 2006 Kent Posts: 8205 :(s)rac
    #4
    You already know what the problem is from the EML.

    Therefore fix that which is broken instead of deciding its something else?
  5. Saxperience Forum Bum Joined: Nov 2010 England Posts: 3423
    #5
    beaniemoo checked and reset the code.. it was the lambda... At the time it wasn't popping or banging.

    So if i replaced the lambda, would i need the ECU code to be reset otherwise it'll still pop and bang?
  6. Saxperience Hardcore! Joined: Mar 2008 Posts: 31279 Citroen Saxo VTS, S60 D5
    #6
    Quote:
    Originally Posted by rey View Post
    You already know what the problem is from the EML.

    Therefore fix that which is broken instead of deciding its something else?
    Thats not logical to him..
  7. Saxperience Post Whore Joined: Jul 2010 Morley, Leeds Posts: 8469 Civic ep3 type r powered by TDI NORTH
    #7
    Quote:
    Originally Posted by logic_guy View Post
    beaniemoo checked and reset the code.. it was the lambda... At the time it wasn't popping or banging.

    So if i replaced the lambda, would i need the ECU code to be reset otherwise it'll still pop and bang?
    unplug battery then replace lambda then plug it in reconnect the battery and start the car up. Eml should stay off because its reading the working lambda.
  8. Saxperience Forum Bum Joined: Jan 2009 Surrey Posts: 2608 200sx s14a mark 1 vts
    #8
    Change the lambda, and it will send proper readings to the ecu, so problem will go away.

    Or suck it up and drive round spitting flames everywhere like a boss
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  9. Saxperience Post Whore Joined: Dec 2006 Maidstone Posts: 8210 Golf TDI
    #9
    Change what you know is broken first and then go from there if it doesn't resolve it.
  10. Regular Poster Joined: Apr 2011 Wrexham, North Wales Posts: 307 Gold Saxo VTS & a Yellow S2000
    #10
    Think i'd stop driving this car for the time being as could be doing damage. Just think, any money repairing it will at least be stopping you spending loads on fuel.
  11. Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182
    #11
    Lambdas are easy to swap though, just buy a new one and fit it
  12. Saxperience Forum Bum Joined: Nov 2010 England Posts: 3423
    #12
    I have a manifold so I'll need to 'Sleeve' the unused lambda.

    Can someone confirm that on a Mk2 manifold that the TOP lambda from the OEM manifold goes in the Super Sprint manifold and bottom one (after the CAT) gets sleeved?

    I have a Super Sprint centre pipe too and that has a hole for a lambda. Would it be worth lengthening the wiring then sleeving it and fitting it in here rather then the manifold?
  13. Saxperience Post Whore Joined: Jul 2010 Morley, Leeds Posts: 8469 Civic ep3 type r powered by TDI NORTH
    #13
    Quote:
    Originally Posted by logic_guy View Post
    I have a manifold so I'll need to 'Sleeve' the unused lambda.

    Can someone confirm that on a Mk2 manifold that the TOP lambda from the OEM manifold goes in the Super Sprint manifold and bottom one (after the CAT) gets sleeved?
    Yeah you got that correct.

    Quote:
    Originally Posted by logic_guy View Post
    I have a Super Sprint centre pipe too and that has a hole for a lambda. Would it be worth lengthening the wiring then sleeving it and fitting it in here rather then the manifold?
    I could be wrong but I didn't think you could make the wires longer to a lambda? but yes if you have 2 holes for 2 lambda sensors its best to use both.
  14. Saxperience Forum Bum Joined: Aug 2009 Oxford Posts: 4547 '55 Plate C2 VTS
    #14
    Quote:
    Originally Posted by logic_guy View Post
    Can someone confirm that on a Mk2 manifold that the TOP lambda from the OEM manifold goes in the Super Sprint manifold and bottom one (after the CAT) gets sleeved?
    Mine was done like this and was fine.


    Quote:
    Originally Posted by Bedford126 View Post
    I could be wrong but I didn't think you could make the wires longer to a lambda? but yes if you have 2 holes for 2 lambda sensors its best to use both.
    No because the second lambda won't be ready clean air, so the EML will still be on...
  15. Saxperience Forum Bum Joined: Nov 2010 England Posts: 3423
    #15
    Quote:
    Originally Posted by Bedford126 View Post
    Yeah you got that correct.



    I could be wrong but I didn't think you could make the wires longer to a lambda? but yes if you have 2 holes for 2 lambda sensors its best to use both.
    Neatly cut the Lambda wire in half and solider a new longer piece of wire in its place. Then shrink wrap the whole Lambda loom so its neat then clip it/ cable tie it along under your car.
  16. Saxperience Post Whore Joined: Jul 2010 Morley, Leeds Posts: 8469 Civic ep3 type r powered by TDI NORTH
    #16
    Quote:
    Originally Posted by logic_guy View Post
    Neatly cut the Lambda wire in half and solider a new longer piece of wire in its place. Then shrink wrap the whole Lambda loom so its neat then clip it/ cable tie it along under your car.
    IIRc lambda sensor wires are made from stainless and when soldered it creates resistance in the wire and gives the ecu a false reading. Could be wrong but i seem to remember that from college even though it was 4 years ago.
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  17. Established Member Joined: May 2010 leicester Posts: 1446 Clio 182 Inferno
    #17
    As long as the 2nd lambda sensor is reading clean air then it thinks the cat is fitted and doing its job so the fueling will remain stable mine's cable tied near the top of my gearbox on a loom bracket and i hve no issues tbh
  18. Regular Poster Joined: Jan 2012 hemel Hempstead Posts: 413 l200 worrior saxo vtr stock hatch Seat leon 20v
    #18
    I would also change the oil and filteras if you been over fueling that much you can glaze the bores and the fuel goes past the rings and in to the sump. then your oil becomes to thin and will kill the bottom end

    manic
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  19. Saxperience Post Whore Joined: Aug 2009 ilkeston derbyshire Posts: 9823 C2 VTR stripped, 406hdi, clio 172
    #19
    i've always been suss about joing lambda wires because of the resistance issues but then you can get universal ones with crimp connectors that seem to work ok
  20. Established Member Joined: May 2009 cleethorpes, Lincolnshire Posts: 1830 Astra 2006 (55) 1.9 cdti 150 sri 192hp 322ftlb
    #20
    Quote:
    Originally Posted by logic_guy View Post
    So i'm getting 170 miles to £50 of fuel.. Normal motorway driving in my VTR @75Mph.

    I'm popping like mad and my exhaust goes BANG. Numerous people have told me my exhaust is on fire (Just after it goes bang, so its obviously a flame) and the car struggles to idle and when it does, it stinks of petrol.

    The EML light is on which is a Lambda Sensor (Checked out by Beaniemoo) but only recently its started over fuelling. I can't see why the EML has been on for a few weeks now yet only in the last few weeks its srsly overfueling.

    I have a hunch maybe it could be a injector sensor problem so its injecting more fuel.

    Thanks
    you should be doing 70mph...
  21. Infrequent Poster Joined: Sep 2011 leicester Posts: 162 Saxo furio
    #21
    i had same problem but mine wasnt just the lambda it was the coolant sensor aswell
  22. Infrequent Poster Joined: Sep 2011 leicester Posts: 162 Saxo furio
    #22
    but i would change the lambda then get another check to see if anything else has gone in the meantime
  23. Established Member Joined: Sep 2007 Armadale, West Lothian Posts: 1230 flatty 16v sleeper and a regular vts
    #23
    Quote:
    Originally Posted by xxo0pko0xx View Post
    you should be doing 70mph...
    apparently a saxos speedometer is 10% out. he would only have doing 67.5mph...