Important! : Over heated spark plug

1. wobby82 Frequent Poster Joined: Mar 2011 Posts: 839 icelancic grey 2oo2 vtr icelandic grey vts 2oo2

   #1 7th May 2013, 20:17

   I have a mk2 Vts , strait through decated saxport system, over a period of time it developed a slight lumpy idle so other day I decided to clean icv , put it back in and still the same, so I thought I'd have a look at the spark plugs that I put in only 3 month ago and noticed that the tip from the 2nd one in from the left was slightly distorted like it had been getting too hot ( I used nkg plugs) anyway swapped the plug and she's idleing like a dream and driveing like one, however I have a funny feeling that this problem may comeback over time, if it does what could cause this? Ok I have the 2nd lambda capped (maybe running a bit rich) possible cause of the over heated plug? Here are pics
   
   
   The day nice na true
2. user_31412 Established Member Joined: Feb 2009 ★ West / North Yorkshire ★ Posts: 1653

   #2 8th May 2013, 02:46

   Doesnt look too bad, might just be generally old worn out plugs.
   
   Running rich would make it run cooler if anything.
   
   Try using cooler plugs (7) if it bothers you.
3. wobby82 Frequent Poster Joined: Mar 2011 Posts: 839 icelancic grey 2oo2 vtr icelandic grey vts 2oo2

   #3 8th May 2013, 20:05

   The plug in the pic is 3 month old
   
   
   The day nice na true
4. wobby82 Frequent Poster Joined: Mar 2011 Posts: 839 icelancic grey 2oo2 vtr icelandic grey vts 2oo2

   #4 9th May 2013, 21:05

   Bump
   
   
   The day nice na true
5. wobby82 Frequent Poster Joined: Mar 2011 Posts: 839 icelancic grey 2oo2 vtr icelandic grey vts 2oo2

   #5 9th May 2013, 21:05

   No one ever had this
   
   
   The day nice na true
6. citroensaxo Infrequent Poster Joined: Apr 2012 Kent. Posts: 246 93 BX TXi 1.6 auto,47k 88 SAAB 900i f/lft,69k

   #6 10th May 2013, 18:04

   Dear Wobby82,
   Firstly, looking only at your spark plug, I think your car is running a tad on the rich side.
   First question I need to ask is an obvious one really, is it just the one plug, or is it as I would imagine that all four are the same ?
   However, I don,t profess to be an expert on " tuned " engines. What I would do would be as previously mentioned in this thread that you put a slightly cooler plugs in. At least that would sort your worries out about it happening again.
   Lastly, I would try and check for the reason why the car is running a tad rich, could it be an over fueling problem ? or some other reason.
   Vince,
7. wobby82 Frequent Poster Joined: Mar 2011 Posts: 839 icelancic grey 2oo2 vtr icelandic grey vts 2oo2

   #7 10th May 2013, 20:13

   Lovely reply vince thank u, I'm wondering if it's because I only have the one lambda plugged in as I have a saxport system witch has a dummy cat, also it was just the one plug, please can u tell me what kind of cooler plugs to try? Also my Vts does 100 miles to about £13:00 so it's not really over furling that much
   
   
   The day nice na true
8. wobby82 Frequent Poster Joined: Mar 2011 Posts: 839 icelancic grey 2oo2 vtr icelandic grey vts 2oo2

   #8 10th May 2013, 20:14

   Thanks outrage also
   
   
   The day nice na true
9. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #9 10th May 2013, 20:39

   http://www.ngksparkplugs.com/tech_su...qs/faqcode.asp this may help mate.

   1 user thanked this post: citroensaxo
10. wobby82 Frequent Poster Joined: Mar 2011 Posts: 839 icelancic grey 2oo2 vtr icelandic grey vts 2oo2

    #10 10th May 2013, 21:03

    Thanks had a look but it's not leman enough for me I just need to know what to ask for at the counter
    
    
    The day nice na true
11. citroensaxo Infrequent Poster Joined: Apr 2012 Kent. Posts: 246 93 BX TXi 1.6 auto,47k 88 SAAB 900i f/lft,69k

    #11 10th May 2013, 21:10

    Dear Wobby82,
    I may stand to be shot down in flames, but if my memory serves me correct, I think you need to go down to NGK BP5ES,s
    
    
    Dear Stevo67,
    Thank-you so very very much for finding and editing said " link "
    Vince,
12. wobby82 Frequent Poster Joined: Mar 2011 Posts: 839 icelancic grey 2oo2 vtr icelandic grey vts 2oo2

    #12 10th May 2013, 21:17

    Lovely vince, and that's the correct size ect / fit for my car? I just ask for that what you've just quoted and swap them strait over? Regaurds
    
    
    The day nice na true
13. citroensaxo Infrequent Poster Joined: Apr 2012 Kent. Posts: 246 93 BX TXi 1.6 auto,47k 88 SAAB 900i f/lft,69k

    #13 10th May 2013, 21:43

    Dear Wobby82,
    I think they should fit fine
    Vince,
14. user_31412 Established Member Joined: Feb 2009 ★ West / North Yorkshire ★ Posts: 1653

    #14 11th May 2013, 01:18

    As i said, id personally want to fit colder plugs (7) if your concerned they are over heating.
    
    The higher the number the smaller the insulation inside the plug.
    Smaller the insulation means the quicker the heat leaves the plug into the cylinder head which = a cooler running plug (in theory).
    
    4x BKR7EKU for 2 core electrode
    
    4x BKR7EIX for Iridium