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Old 02-24-2001, 08:12 AM   #1
Revision
Scooby Guru
 
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Join Date: Sep 1999
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Location: Carol Stream, IL USA
Vehicle:
MY05 PSM GGA !STOCK
MY99 RS-RIP / MY95 MX-5

Unhappy Ignition Block Trouble (pics)

RUST!!!!

<IMG SRC="http://albums.photopoint.com/j/View?u=1155221&a=11755957&p=41856215&Sequence=0" border=0>

Well, it was time to tune up the old scooby and when I removed the ignition wires, what do I find? Corrosion on #4. I can't even get a ohm reading on the dang thing. No wonder my engine felt like it was misfiring occationally. Funny thing is that there is no check engine light... Wonder if the light is busted. Currently, I've removed the rust and salt using sandpaper and steel wool and given the whole thing a coat of di-electric grease. Seems to be running ok.

The #4 ignition wire was also funny. I could't even get a continuity test off of it. Geez its a wonder that my engine even ran.
Ignition wires 1-3 and block terminals 1-3 were all clean and gave resistance readings within spec.

Check your terminal block. Currently we believe this may have been caused by running the scoop vent open last summer.


Here are some pictures of #4 spark plug. Note Champion. The center electrode shows definite signs of rounding and the outer electrode has some wierd "corronsion"? and pit marks.

<IMG SRC="http://albums.photopoint.com/j/View?u=1155221&a=11755957&p=41856223&Sequence=0" border=0>



[This message has been edited by Revision (edited February 25, 2001).]
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Old 02-24-2001, 09:04 AM   #2
Patrick Olsen
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1997 Legacy 2.5GT
QuickSilver Metallic

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I'll be changing my plugs and wires today. I'll be on the lookout for anything unexpected like that.

On a somewhat related subject, I'm going to check the old wires vs. the new wires (both Subaru OEM) to see how well they "age". The wires on the car now are the original factory wires with almost 60k miles on them.

Where are you taking the resistance readings? From the block terminal to where?

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 02-24-2001, 09:19 AM   #3
Avenger
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Using a continuity test on the sparkplug wire is useless, due to the high resistance of the wire. You should do a OHM reading from the wire it should be in the K ohm area.. I can't remember the specs per length of the wire.. But I hope this helps. Also how are you testing the ohm reading of the coils? Assuming you did this and go no reading. I think you are supposed to put one lead to the terminal and the other lead to ground. Not too sure on this.
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Old 02-24-2001, 09:39 AM   #4
Revision
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I'm gettinig between 6k and 7k ohms per wire with the exception of #4 whick gives infinite resistance (air).

Off the terminal block, I tried measuring the resistance off of one side of the terminal to the other to see just how much corrosion there was. I got infinite resistance. The normal reading is 0 ohms for the clean terminals.

A new ignition coil will cost me @$155, retails for @$175. Hopefully, I won't see anymore misfires.
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Old 02-24-2001, 10:58 AM   #5
8Complex

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Don't get a new coil, you dolt! Just make sure the wire is sealed on there and you'll be fine.

BTW, only you could get 3 shots of different angles of a rusty connector.
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Old 02-24-2001, 11:59 PM   #6
Avenger
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By what you say about the wires, No. 4 is dead.. Get a new set of wires and try it out first..
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Old 02-25-2001, 06:45 AM   #7
Revision
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Yeah, its already been replaced. Car runs much more smoothly. I'd notice a shudder from the car while sitting at idle on occation. That shudder is now non-existant. Plus the engine PURRS! (It could also be from the full tuneup on the car. Redline everywhere )

If I notice any hickups though, I'm replacing the ignition coil. $150 is cheap for peace of mind.

Still not sure about the cause of the corrosion. Could the bad wire have caused the terminal to arc and pit allowing to start to rust? Or does opening the hood scoop really get the ignition coil wet? (I've never witnessed a wet ignition coil after a short rain drive.) Only #4 was affected and that one most definitely had a bad wire.
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Old 02-25-2001, 10:04 AM   #8
Blindeye_03
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I had a old bmw and the #6 plug fell out of the engine after I had an oil leak fixed...with 5 cylinders working it sounded pretty messed up like a lawn mower LOL
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Old 02-25-2001, 05:11 PM   #9
Avenger
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Would it be cheaper to buy an aftermarket coil instead of a subaru one.. ie. MSD.
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Old 02-25-2001, 05:24 PM   #10
BoostFreak
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I've seen corrosion and rust on ign. coil terminals before on other cars, it's normal. Just use some fine grit sandpaper to remove the rust, and apply dielectric grease to the inside of the spark plug boots to prevent anymore corrosion or oxidation.
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Old 02-26-2001, 12:43 AM   #11
garface
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I don't think the open scoop is that much worse for allowing water in. I opened up my hood yesterday and checked everything out, everything is covered in road salt except for the area under the scoop. Tons of water seems to be getting in through the grill area or from under the hood.
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Old 02-26-2001, 06:00 AM   #12
RawCode
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Or forget the stock ing. system and just get a tech II! lol.. yeah I know it costs a lot of money , but we can dream can't we?
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Old 02-26-2001, 06:11 AM   #13
subarumantoo
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Blue Ridge Pearl

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I believe that the Subarus use a "waste spark" system. What I mean by that is, the coils fire two holes at the same time, one on compression but another one on exhaust. If you pull off one of your spark plug wires you will have TWO dead holes. There has to be continuity through two spark plugs for there to be any spark. That means that if your number 4 wire was dead you would have had two dead holes. From looking at the picture, I would not replace that coil, just clean it up. I would put new wires on it though. When you replace the wires, make sure that you put silicone grease on both ends of the wire.
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