S2 RB25DET COP replacement

[datsunmotorsports]

I just changed my plugs out and found corrosion around the old plugs. I cleaned the head surface and the isolator boot on the coil packs off pretty good. I noticed that after the car came up to temp that the engine still has a miss. So I stuck my head down by the valve covers and I could hear noise around the rear cylinder COP's. I thought it was coming from either cylinder #4 or #5 so I took it back apart and cleaned the area up as best I could. This time I washed the areas with warm soapy water and a paper towel. I warmed it back up and the miss was still there. So I waited until tonight.

With the lack of light I popped the hood and looked at the coils for bleed off and there it was. # 1 and #6 both have bleed off. The car stopped missing as bad, but I can still see the spark bleeding off. Its on the driver side of the coils(exhaust side) and it looks to be bleeding to the COP rails. Both are doing the same thing.

These COP's are the S2 ones so they have built in Ignitors. Im hoping the COP case is just dirty still and the case isnt actually damaged and seeping the spark out to ground.

Does this sound like a typical COP failure or is it likely dirty? If they have failed how hard is it to get the S2 COPs? Ive heard the COPs on the CA18 can be swapped with the S1 coils. I vaguely remember the Infiniti V8 coils and I think they might actually work if I can find the V series without an ignition pack system.

thanks for any help

[lazyboi444]

When you say bleed you mean arcing?

[datsunmotorsports]

When you say bleed you mean arcing?

yes from the side of the COP to the rail I think.

[Carl H]

in a bind you can use the vq30de coils from a mid 90's maxima...iirc its the rear coils that work.dont bolt in but will get you home.

[eh?]

Wrap the suspected coils with electrical tape and see if it goes away. if it does some have re epoxied the coil casing. The are good examples on the Australian forums.

[Coolwhip]

Wrap the suspected coils with electrical tape and see if it goes away. if it does some have re epoxied the coil casing. The are good examples on the Australian forums.

QFT. If they are arcing then this will fix your issue.

[datsunmotorsports]

Wrap the suspected coils with electrical tape and see if it goes away. if it does some have re epoxied the coil casing. The are good examples on the Australian forums.

Thats a cool trick.

Here is a little more info. no matter what temperature the engine is #1 and #6 have a faint leak to the rail. This doesnt seem to affect performance... yet. The leak I can hear and causes a miss-fire happens only when the car is at full opperating temp and its #4 COP from the casign to the iron core that wraps around. So I stucks some tape between the 2 very carefully. Its bleeding off the entire spark though rather than just part like the other 2 so my guess is that its time to replace that COP for sure and time to think about replacing the others.

[Darius]

zerothread?id=353364

[datsunmotorsports]

zerothread?id=353364

That is an awsome link! Thank you Darius!

I actually came across a link similar to that one in my searching this forum, but it wasnt that one and didnt have the info about the dremel.

I epoxied the 2 worst offenders and it DID take longer to start the missing but they were still missing. It just wasnt as bad. So Im going to try the dremel trick.

I know water sat on the tops of cylinders #4 and #5 and they are the coils that are arcing out so there must be corrosion up there that I have yet to get.

Thank You will give it try and report back.

[Darius]

Please post your findings because I think my arcing problem at 3500 rpm just got pushed up to 6000 rpm by coating the coilpacks. Not cool when I want a 7500 redline...

[datsunmotorsports]

I just got them appart and figured out the spring just pops out. I was worried about damaging them, but its no be deal. Im washing the springs in "CLR" and Im going to clean the crud out of the inside of those coils. They are corroded bad. I will get back to you guys and let you know how well it worked. I will be very happy if this works.

My backup plan is to run a 6 pack of coils with 6 ignitor packs from a late eighties VG equipped car. You can practically wire those ignitors up the same way the coils are now wired. Then run a Ignition wire like the blk/wht one that the car originally used for the single coil to power up everything.

But Ive got my fingers crossed the epoxy and scrapping works.

[Darius]

Or you can just get LS2 coils with the ignitors in them and lose the ignitor all-together.

[datsunmotorsports]

slapped them back together and it still missed. #5 is pretty bad. So I wrapped both coils in electrical tape. Epoxy vinyl tape and cleaning them finally fixed it. I cant keep the tape on there for long. Heat will take it out. And the epoxy I used was the cheap 4 min stuff and it comes off pretty easily still since its been less than 24 hours. It takes 24 hours to fully cure. So Im going to drop by Lowes and see if I cant find some of the stuff from the other post which is linked above. Hopefully that will totally seal me up and let me run it. I didnt realize how tense and frustrated I was till I got the car to actually push past that 5K rpm limit without missing. I feel a sort of relief. Thats all the problem is so I just need to solve it with the many solutions that have been provided already.

LS2 coils? I will have to look around and see what I can find. Im not sure how I feel about dealing with spark plug wires. The COP is so neat and tucked away. But if I have no alternative I suppose that would be much easier than collecting 6 ignitor units.

[Darius]

It is tough to find a good COP aftermarket pack that fits on the RB. Almost have to go with individual coils and plugs for high HP applications (>700hp).

[datsunmotorsports]

http://www.napaonline.com/NOLP...2211#



S1 replacements or possible source for S2 replacement?Looks almost exactly like mine except the boot.

[Nissan2367]

What is that coil out of? And will it bolt on the RB rail?I wraped my coils and cleaned the copper and it still misses and runs like crap...
Modified by Nissan2367 at 4:03 PM 1/8/2009

[datsunmotorsports]

There are probably easier ways to do this but I may have access to execute it anyways.

Make a Phenolic rail that is just like the aluminum one. Then replace the coils if I can find replacements. The Phenolic rail would insulate the coils just that much more. When I isolate the coils from ground and run a plug wire the problem is instantly gone. No more bleed off. Obviously if I cant get the phenolic rail made there is always the other options.

The coil listed above is just a random part I was looking at through napa. I pulled it up after looking up a 98 Infiniti ignition coil and then changing the part number until I ran across it. My guess is that VH41 Y33 platforms will have what we need, but thats only a guess. Im going to see if I cant find the manufacturer of the napa coils and call them for specs if possible. 100 bucks per coil is 600 bucks, but a year make model that the part comes from my help us find it in a salvage yard and chances are it will be from a newer car with good parts still.

[datsunmotorsports]

I had a phone call made to the manufacturer of the coils sold through Napa Auto parts. I gave them MCP-1330. They gave me there part number IC383. Napa Online lists it for 119USD. They should be a direct replacement as per the manufacturer. Its possible they are not. I have a lead on a set of coils for less than half that for all six, but if that falls through I will let you all know if the new ones work as specified.

Ray

[nismo8117]

picking up a set for my S2 from rawbrokerage... here is the link http://shop.rawbrokerage.com/c...d=118

[datsunmotorsports]

picking up a set for my S2 from rawbrokerage... here is the link http://shop.rawbrokerage.com/c...d=118

I purchase a set as well.

I also tried applying a coat of Liquid tape to the 2 of the worst COP units and it worked on one! the other is still leaking pretty bad. So that could help someone that was on their way out. BTW I purchased the liquid tape stuff from Ace Hardware.

Ray