Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

Light show


  • Please log in to reply
11 replies to this topic

#1 91 subaru

91 subaru

    USMB is life!

  • Members
  • 247 posts
  • miami, ok

Posted 22 June 2013 - 10:22 PM

81 dl. My car has been idling a little rough so i bought new ngk plugs and some omni spark 8mm plugwires. It still idled rough and after fiddling with different things i couldnt figure it out. This past monday i had the hood open and the car running. It was dark out and i noticed the number two plug wire shooting spark to the clip that holds the cap on. I figured bad cap or a crack. I looked a little harder and there is tiny real light sparks/arcing everywhere on the wires. I got to looking around and the plugs are even arcing between the part of the plug where you would put a socket to take out the plug and the head. All four plugs do it and all four wires have the random arcing. I replaced the wires with a set of ngk 7mm wires and i still have the same problem. Can anyone tell me how to fix this? I have searched around on here and all i can come up with is new coil. Sound right?

#2 Mark Humble

Mark Humble

    USMB Regular

  • Members
  • PipPipPip
  • 119 posts
  • Lewiston Ca.

Posted 22 June 2013 - 11:06 PM

Sounds alot like spark plugs have too much resistance. Maybe wrong plug or too wide of gap. Most of the time if you see an arc between the dist. cap and ground or the coil tower and one of the primary terminals it is bad plug wires and or spark plugs. But to arc from the plug wire across the spark plug insolator is rare. What number plugs did you install?

 

Mark



#3 91 subaru

91 subaru

    USMB is life!

  • Members
  • 247 posts
  • miami, ok

Posted 22 June 2013 - 11:28 PM

The plugs are brand new ngk BPR6ES-11's. Gapped to .040 also brand new wires put on this morning. The 8mm wires arced so i replaced with new ones. 7mm and they do the same thing.

#4 naru

naru

    1000+ Super USER!

  • Members
  • 1,765 posts
  • under the bridge

Posted 22 June 2013 - 11:39 PM

Arcs between the plug hexes and the head suggest that the plugs are not grounded to the  heads thru the threads for some reason.

Did you use some type of anti-seize?

 

I would measure resistance between the plug hex and the head for confirmation.

 

Coil sounds fine.



#5 91 subaru

91 subaru

    USMB is life!

  • Members
  • 247 posts
  • miami, ok

Posted 22 June 2013 - 11:53 PM

Nope no anti- seize. Just tightened the plugs into the heads. Ill check the resistance tomorrow.

#6 Mark Humble

Mark Humble

    USMB Regular

  • Members
  • PipPipPip
  • 119 posts
  • Lewiston Ca.

Posted 23 June 2013 - 01:16 AM

Rereading your post, I see you said it is arcing between the plug base and the cyl. head, not across the plug insolator. I would check to see if the ground strap from the engine to the body is in place, also check the coil braket grounding to the body. The coil is grounded to the body not the engine. There needs to be a ground path between the coil braket and the engine or the spark will try to find a path, like through the air. Think radio.

 

Mark



#7 rdweninger

rdweninger

    USMB Regular

  • Members
  • 422 posts
  • Tillamook, OR

Posted 24 June 2013 - 11:47 AM

So, was it the engine to body ground? Or coil to body ground?

#8 91 subaru

91 subaru

    USMB is life!

  • Members
  • 247 posts
  • miami, ok

Posted 15 September 2013 - 07:42 PM

Coil to body is good. All the grounds i can find are good. I found one engine ground that goes to the negative side of battery. The battery then has a smaller gauge wire going to the inner fender. I added an 8 gauge ground wire. Still have the same problems. I did some reading on coil wires and found that the coil has two yellow wires on the negative side and two black with white and a solid black on positive side. My coil has those wires. Except i also have a black with red on the positive side. Anyone know what the black with red? I took it off and everything still works. The black with red has no + volt at any time. Its not dark enough to see if i have the same arcing problems. Any help id appreciate.

Attached Files



#9 naru

naru

    1000+ Super USER!

  • Members
  • 1,765 posts
  • under the bridge

Posted 16 September 2013 - 02:57 PM

I think you will find the black with red has power w/the ignition is in the start position.

It bypasses the ballast resistor for starting.

 

Put an ohmmeter between the hex and the head yet?



#10 91 subaru

91 subaru

    USMB is life!

  • Members
  • 247 posts
  • miami, ok

Posted 21 September 2013 - 07:26 PM

With the ohm meter between the hex and head. Good or bad?

Attached Files



#11 aba4430

aba4430

    Eat, Live, Breath Subaru

  • Members
  • 333 posts
  • Royston, GA

Posted 22 September 2013 - 07:44 AM

One observation; not related to your issues - Are you missing a radiator ground.  This is one that connects the radiator to the right upper fan shroud bolt??



#12 91 subaru

91 subaru

    USMB is life!

  • Members
  • 247 posts
  • miami, ok

Posted 22 September 2013 - 09:24 AM

Its there just towards the middle instead of the outside




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users