Help: Bad coils

[Aricjm15]

I was kind of wondering about the whole detonation thing too
my brother blew his engine to hell and it has the same coils, LinuxRacr has gone through 3 engines and he probably has the same coils

that and how does the energy from detonation travel back through the spark plug into the coil, especialy when detonation is not electrical
unless the detonaiton has completely killed the sparkplugs forcing the two electrodes together grounding out the coil causing itself to fry that way, but you can still change out the sparkplugs before the coils fry. I'm guessing you have already checked the spark plugs,
ok I just read that you put in new plugs and this is the first time trying to start it since the new plugs, if it ran before it could not be detonation, something must have happened when you swapped plugs

 

[Little Beavis]

Forget the detonation theory, that's just plain wrong. Coils don't melt from detonation.

It's far more likely that it's something to do with your piggyback setup. Too much dwell could damage the ignitor for example. What is the PB you're using?

What was the sequence of events - something like this:
1. Car runs fine.
2. Install piggyback.
3. Car won't start.
4. Find damaged coil.
?

Keith

What no detonation! I agree. . .

Here's what happened:

1 - Car runs fine.
2 - Install piggyback
3 - Car idles like crap
4 - Decide to get new spark plugs (also find out that the piggyback is apparently wired to a constant power rather than a switched power. . .could be our problem here)
5 - Install new spark plugs and fix wiring
6 - Car won't start

The though now is that the piggy might have just found itself sitting there with the car off but trying to fire one of the coils (the one that melted because the piggy was still powered due to incorrect wiring. Make sense?

The piggy is wired up correctly now, but it wasn't at first, so maybe it screwed something up. . .the confusion on my part was that the car ran when the piggy was wired incorrectly, and no longer runs now that it is wired correctly. . .but it seems obvious that my coils are shot now! Damn my luck. . .any good deals on an RX-8 these days?

Does that make more sense guys? I wasn't trying to hide anything, I just didn't understand how it could melt a coil, but I did know it wasn't detonation! (rofl)

 

[Keith@FP]

About the "squashed plug" theory - the plugs are in series, so even if one has a 0 gap the other will still fire and the coil will be discharged. Actually, the other plug will fire really well

You'll have to replace the coil anyhow from the looks of things, and if you truly can get them for $17 as acidbg posted in his other thread then go for it. Then see if the car starts. Make sure you don't have the signals for the two coils mixed up either, as having those backwards will certainly keep your car from running. The wiring problem could potentially have caused the problem. There's always 12V going to the coils, but if the ignitor was switched on you'd definitely have a problem.

Keith

 

[Kooldino]

So order those coils, Beavis! When I talked to you that night, I should have checked how mine was wired when I asked you what power line you were tapped off of.

Keith, I believe the proper order is:

1. Car runs fine.
2. Install piggyback.
3. Car won't start.
4. Find damaged coil.
5. Steal Underpants.
6.
7. Profit.

 

[Little Beavis]

So order those coils, Beavis! When I talked to you that night, I should have checked how mine was wired when I asked you what power line you were tapped off of.

Keith, I believe the proper order is:

1. Car runs fine.
2. Install piggyback.
3. Car won't start.
4. Find damaged coil.
5. Steal Underpants.
6.
7. Profit.

Damn underpants gnomes. . .

Ordered the coils. . .they quoted me $12 something. We'll see. I've also got a spare set coming to me from another forum member. . .this place rocks! I'll keep you posted.

 

[Bigg Tim]

Where do you have the power for the PB coming from? I think mine is on pin 71 (white/black)

 

[Little Beavis]

Well, got new coils coming to me. . .$27.72 after tax for two of them. I have NO clue why they are that cheap, and the guys at the parts department couldn't believe it either. Apparently there are two part numbers pointing to the coils and one was $75 something and the other was $12 something. So, I told them to order me two $12 parts. They appear to be the correct ones, we'll see how they work.

The newest theory (kind of still the same) is that the incorrect power source (constant power pin by mistake) is what caused the problem. The PB simply kept trying to fire the coil until the thing melted. s*** happens. . .at least this repair is a cheap one!

 

[dominoy2k1]

hah samething happened to me, when he said 15 for a coil i was like are you sure? the guy was umm yeah hold on, thats the new part number wich is cheaper, the other is like 50. so wich one do you want he asked, i waslike the 15 dolla one sucka!! so yeah, oh well hope everything comes out coo for you beavis

 

[turboge]

Hook me up with the link to those coils... The only think that is different are the wires, they have seperate resistance on each one.

 

[Little Beavis]

Coils are Mazda OEM
FFY1-18-100
I can't see any difference between these and the ones the car came with. . .heck they even came with the "boot" for the plug right below the coil. And at this price. . .heck they're cheaper to replace then a set of wires!

 

[DooMer_MP3]

Wow. I should just order some for the hell of it just in case. Who knows if the price is an error or something...

Chris

 

[KzA]

heh bring back an oldie...

I just blew mine :-(

****** killed a battery tryin to crank it just like beavis..wish I would took off the engine cover first..See there is at least 1 advantage to not having the MP3\MSP engine cover

 

[KzA]

omg this ******* board is so stupid you cant even write simple html in a post

 

[Bigg Tim]

What's wrong that made you have to crank over so much?

 

[DooMer_MP3]

Ok, I'll probably get blasted to hell for saying this, but facts are facts. Thats two people with ****** coils running the MPI tuner. Is there something wrong with how it does timing (similar to how the Greddy people said the eManage wouldn't work on our cars because it might fry the coils)? JUST CURIOUS!

Chris

 

[PaulMP3]

im pretty sure spoolinmp3 blew his coils when using the LINK system as well.. or what ever piggy back he ran before.

I should probally order a set (dunno)

 

[DooMer_MP3]

Ahh yes, I remember that now... So what the heck is causing this all? Is manipulating the timing on our coils that horrible of a thing?

Chris

 

[KzA]

no..here is the problem..the mpi is seeing power when the key is in the on position..therefor if you have the key in the on position and the car is not on(say your watching a movie or playing a cd) the mpi is giving power to the coils..not good..if you leave it long enough, fryyyy time...when I first wired the mpi for ignition, i wired them backwords, so i think that might have done some damage to them, also..

 

[KzA]

and oh yea..we are trying to come with a fix for this right now..just gotta think of a way to power it only when the engine is on

 

[PaulMP3]

that makes sense.. thanks for the heads up...

Now this makes sense why my battery died on me last month while listening to the radio w/ the car off while changing my tires... it wasnt more then 40mins and it didnt have the juice to turn over. Would this contribute to the rapid battery drain??