Results 1 to 7 of 7

Thread: Orange plugs

  1. #1
    Registered User
    Member ID
    CZCC-19999
    Join Date
    Sep 2009
    Location
    Tucson Az
    Posts
    696

    Default Orange plugs

    Hey mates

    This past evening I changed the plugs out in my Z as she was running oddly rich and rough. This is what I found. Can someone elaborate on why my plugs are orange? They are a bit cooler (5 on the heat range) but I'm wondering.

    Click image for larger version. 

Name:	DSCN0038.jpg 
Views:	75 
Size:	254.3 KB 
ID:	65518

    Thanks
    Jan
    Last edited by Pomorza; 08-27-2013 at 12:05 AM.
    1976 280Z
    HLS30288273

  2. #2
    Nova Scotia,Canada,Earth Blue's Avatar
    Member ID
    CZCC-7641
    Join Date
    Jan 2005
    Location
    NS
    Posts
    4,085

    Default

    I used a fuel injector cleaner and had orange deposits on my plugs from it... looks like you may have a bad batch of gas with too much refinery additives. octane boosters can do this too....they also deposit on O2 sensors (on cars with those).
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  3. #3
    Registered User Gary in NJ's Avatar
    Member ID
    CZCC-21253
    Join Date
    Mar 2010
    Location
    Amongst the twisty roads
    Posts
    1,057

    Default

    Other then the orange coating, those plugs look good. Why do you think you are running rich? I also see you are running BPR5ES-II instead of the BPR8ED-II. Was this to mask a rich condition?
    Last edited by Gary in NJ; 08-27-2013 at 05:32 AM.
    Gary
    Guardian of HLS30-91415
    Previous Owner of a 10/70 240Z ('83-'85)

  4. #4
    HLS30-454423 3/78 Virto's Avatar
    Member ID
    CZCC-9429
    Join Date
    Sep 2005
    Location
    Elgin, Illinois
    Age
    40
    Posts
    542

    Default

    I also run BPR5ES-II and I was under the impression that they are the hotter plug, not cooler - 6ES is usually preferred.
    Kelly R. Johnson
    1978 280Z...yes it's automatic...but I'm fat.

  5. #5
    Registered User
    Member ID
    CZCC-19999
    Join Date
    Sep 2009
    Location
    Tucson Az
    Posts
    696

    Default

    To answer above questions

    I was experimenting to see if a hotter plug would make a difference in my Z. I ran the BPR5ES's for about nine months ago to see if there would be a noticable difference in how the car acted and drove. As for running rich, I have an air/fuel ratio gauge in my Z - in the place of the clock - and during idle it would sit at 11.4 when cold and 12.2 when warm. I don't like it that rich as its bad for too many things - my cat especially. I figured that it was due to the orange deposits on the plugs.

    Thanks
    Jan
    1976 280Z
    HLS30288273

  6. #6
    Low Budget/High Value
    Member ID
    CZCC-20342
    Join Date
    Oct 2009
    Location
    Washington County, OR
    Posts
    3,629

    Default

    As Virto says, -5 is hotter than the -6 standard. The heat range will only affect how clean the electrode and insulator are, not the air-fuel ratio. Usually hotter is chosen for engines that might have lots of short trips where the engine doesn't warm up completely. The orange deposit, from what I've read, is just residue from additives in the gasoline.

    You can adjust your idle air-fuel ratio by opening up (CCW) the idle air screw on the side of the AFM. It will let more air past the AFM vane and lean out the mixture.
    1976 280Z, with some minor modifications

  7. #7
    HLS30A 17574 djwarner's Avatar
    Member ID
    CZCC-27817
    Join Date
    Aug 2012
    Location
    Central FLorida
    Posts
    405

    Default

    Chilton's says, "A small deposit of light tan or grey material (or rust red with unleaded fuel) on a spark plug that has been used for any period of time is to be considered normal."
    1971 240Z HLS30A 17574 L24-021025

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. How close are Atomic Orange and 918 Orange?
    By Rich1 in forum Body and Paint (S30)
    Replies: 2
    Last Post: 11-28-2010, 11:01 PM
  2. 918 Orange (PPG)
    By Rich1 in forum Body and Paint (S30)
    Replies: 9
    Last Post: 10-05-2010, 09:53 PM
  3. orange s30 search
    By dat240z71 in forum Body and Paint (S30)
    Replies: 14
    Last Post: 12-05-2005, 08:02 AM
  4. Anyone have an orange 280?
    By Zvoiture in forum Body and Paint (S30)
    Replies: 23
    Last Post: 07-22-2004, 07:53 PM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •