Results 1 to 13 of 13
  1. #1
    casual poster
    Join Date
    Jun 2015
    Location
    South Africa
    Posts
    111

    Default Holden 308 spark plug issue

    Hi all

    I am having a strange issue with the 308. Motor runs fine and the plugs are all nice and clean with a beige colour on all except 1 plug. This one looks wet. I have had this problem before where the motor had become noisy as though the valves had got loose. When I inspected the plugs found the one plug wet and once replaced motor was again quiet and running beautifully.

    So what would be the cause of the plug not firing or burning out? I am running an HEI distributor on this motor with a quadrajet carb.
    Motor was refreshed about 1000kms ago. New rings and bearings, new camshaft and lifters as well.


    As always your advice is appreciated.

  2. #2
    Do you ever leave? EH179's Avatar
    Join Date
    Jan 2008
    Location
    Ipswich. QLD
    Posts
    3,663

    Default

    Checked the plug lead on that cylinder?

  3. #3
    Do you ever leave?
    Join Date
    Jan 2008
    Location
    Just outside the A.C.T.
    Posts
    1,627

    Default

    Quote Originally Posted by EH179 View Post
    Checked the plug lead on that cylinder?
    x2 !!!!

  4. #4
    casual poster
    Join Date
    Jun 2015
    Location
    South Africa
    Posts
    111

    Default

    Thanks guys. Tested the lead with a multimeter and no readings at all. Lead is dead. Would that be due to normal wear and tear?

    Will be getting a replacement set of leads soon hopefully.

  5. #5
    Do you ever leave?
    Join Date
    Oct 2008
    Location
    NZ
    Posts
    2,833

    Default

    Yep, leads go bad. I have had several do this over the years.

  6. #6
    casual poster
    Join Date
    Jun 2015
    Location
    South Africa
    Posts
    111

    Default

    Found a supplier who has 10.5mm leads. Current size is 8.5mm. From my research the thicker leads are better quality if nothing else.

    Would you agree?

  7. #7
    Do you ever leave? EH179's Avatar
    Join Date
    Jan 2008
    Location
    Ipswich. QLD
    Posts
    3,663

    Default

    8.5mm leads should be fine, stick to name brands.

  8. #8
    Do you ever leave?
    Join Date
    Jan 2008
    Location
    Just outside the A.C.T.
    Posts
    1,627

    Default

    I know that you can't get your timing light to work with a 10.5mm lead !

    9mm Eagle works for me.

  9. #9
    casual poster
    Join Date
    Jun 2015
    Location
    South Africa
    Posts
    111

    Default

    [QUOTE=struggler;744286]I know that you can't get your timing light to work with a 10.5mm lead !

    So are you saying that it would be impossible to set my timing using a timing light using 10.5mm leads? Surely there must be a way to get around this?

  10. #10
    Do you ever leave?
    Join Date
    Jan 2008
    Location
    Just outside the A.C.T.
    Posts
    1,627

    Default

    [QUOTE=kavesh;744330]
    Quote Originally Posted by struggler View Post
    I know that you can't get your timing light to work with a 10.5mm lead !

    So are you saying that it would be impossible to set my timing using a timing light using 10.5mm leads? Surely there must be a way to get around this?
    Yes there is, when you use the timing light replace the No.1 lead with a thinner one, once your done refit the 10.5mm lead.

    Like the Meercats say on the ad...Simples !!

  11. #11
    Do you ever leave? EH179's Avatar
    Join Date
    Jan 2008
    Location
    Ipswich. QLD
    Posts
    3,663

    Default

    [QUOTE=struggler;744335]
    Quote Originally Posted by kavesh View Post

    Yes there is, when you use the timing light replace the No.1 lead with a thinner one, once your done refit the 10.5mm lead.

    Like the Meercats say on the ad...Simples !!
    Mmm, what if he accidentally refitted that dud lead

  12. #12
    casual poster
    Join Date
    Jun 2015
    Location
    South Africa
    Posts
    111

    Default

    [QUOTE=struggler;744335]
    Quote Originally Posted by kavesh View Post

    Yes there is, when you use the timing light replace the No.1 lead with a thinner one, once your done refit the 10.5mm lead.

    Like the Meercats say on the ad...Simples !!
    Thanks Struggler, that is what I was thinking as well:-)

  13. #13
    casual poster
    Join Date
    Jun 2015
    Location
    South Africa
    Posts
    111

    Default

    [QUOTE=EH179;744337]
    Quote Originally Posted by struggler View Post

    Mmm, what if he accidentally refitted that dud lead
    No chance of that as the lead that is dead is number 8, so would not reach number 1

    Besides I will be sure to label the dud if not bin it

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Replies: 22
    Last Post: 06-06-2016, 04:11 PM
  2. Spark plug and carb issue
    By Vsss98 in forum Chevrolet
    Replies: 14
    Last Post: 22-07-2012, 09:07 PM
  3. spark plug leads and spark plugs
    By antro in forum Holden V8's
    Replies: 10
    Last Post: 20-12-2009, 04:37 PM
  4. What is the best spark plug for my HQ 308
    By antro in forum Holden V8's
    Replies: 5
    Last Post: 06-10-2009, 08:59 PM
  5. spark plug gap 355
    By fasteddy in forum Members Lounge
    Replies: 1
    Last Post: 03-08-2008, 11:16 AM

Posting Permissions

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