spark plugs and gapping

Discussion in 'Gen 1 & 2 - Guides (For How-to guides, NOT how-to ' started by Jeff Robinson, May 2, 2015.

  1. Jeff Robinson

    Jeff Robinson SHO Member

    Joined:
    May 2, 2015
    Messages:
    4
    Likes Received:
    0
    Gender:
    Male
    Hello everyone.


    I have a 1992 SHO. When i first git it i replaced the plygs with bosch pkus 4's. I've heard this was a really bad idea. my question, can there be a loss of power from using these plugs? I'm putting in new original pluga back in because I've had the plus 4's in for a couple of years and they look pretty worn...

    Comments?
     
  2. Banshee

    Banshee SHO Member

    Joined:
    Jul 28, 2014
    Messages:
    170
    Likes Received:
    36
    Location:
    New York
    Welcome to the forum. Original plugs are good. What maintenance have you done on the car thus far? These cars are notorious for not being maintained the way they should right off the showroom floor.
     
  3. Jeff Robinson

    Jeff Robinson SHO Member

    Joined:
    May 2, 2015
    Messages:
    4
    Likes Received:
    0
    Gender:
    Male
    Well so far just general oul changes. I replaced the water pump. (That was interesting ). I've added a cold air intake filter, widened the exhaust and replaced various weathered vacuum hoses. I wanted to check the PCV on it but could not locate it. Does the Yamaha 3.0 have one?
     
  4. Banshee

    Banshee SHO Member

    Joined:
    Jul 28, 2014
    Messages:
    170
    Likes Received:
    36
    Location:
    New York
    No pcv valve on that. It has a pcv system though which are just hoses as far as I know. Can someone correct me if I'm wrong please.
     
  5. rubydist

    rubydist SHO Member

    Joined:
    Jun 25, 2007
    Messages:
    6,129
    Likes Received:
    1,842
    Location:
    Denver
    yes, these engines generally run like crap with Bosch +4 plugs (in fact I have a nearly new set that I would give to anyone for the cost of shipping, except no one would want to use them) so it is likely to be down on power if running those plugs.

    the pcv system does not use a "valve" but a separator box (which does not do a great job, hence many people have added a catch can.
     
  6. Jeff Robinson

    Jeff Robinson SHO Member

    Joined:
    May 2, 2015
    Messages:
    4
    Likes Received:
    0
    Gender:
    Male
    Where is this separator can?
     
  7. AREA 91

    AREA 91 PA SHO SHOP

    Joined:
    Jul 17, 2002
    Messages:
    5,268
    Likes Received:
    920
    Gender:
    Male
    Occupation:
    ecentric nut
    Location:
    Area 91
    On the valley of the block.
    Below the throttle body.
     
  8. Jeff Robinson

    Jeff Robinson SHO Member

    Joined:
    May 2, 2015
    Messages:
    4
    Likes Received:
    0
    Gender:
    Male
    Does anyone have any diagrams showing how to clean the pcv system on the Yamaha 3.0?
     
  9. Banshee

    Banshee SHO Member

    Joined:
    Jul 28, 2014
    Messages:
    170
    Likes Received:
    36
    Location:
    New York
    They don't have a pcv system. That's why a lot of people use a catch can for the oil.
     

Share This Page

If you wish to help keep SHOforum running, please click the donation button below