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Old 11-28-2008, 05:28 AM   #1
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Cool Let's play: Good Coil Pack, Bad Coil Pack

In an attempt to chase down an intermittent misfire, lets play Good Coil Pack, Bad Coil Pack:

Click the image to open in full size.

Click the image to open in full size.

Let me know what you think of Left v's Right and if you think it is conclusive!

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Old 11-28-2008, 06:26 AM   #2
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both of them are bad !
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Old 11-28-2008, 06:35 AM   #3
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How can anyone tell the difference? One has a spot and the other one doesn't.
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Old 11-28-2008, 07:45 AM   #4
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even new out of the box from mazda, the bottom can have watermark/fingerprint looking stuff on them.
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Old 11-28-2008, 10:10 AM   #5
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the white spot on the bottom does not necessarily mean it's gone bad. Did you test them with a meter?
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Old 11-28-2008, 10:51 AM   #6
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the bad one is probably the one without the white spot.
I would just put the ls2/yukons on!
OD
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Old 11-28-2008, 10:54 AM   #7
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In an attempt to chase down an intermittent misfire, lets play Good Coil Pack, Bad Coil Pack:
We've been playing that game for 5 years now. Troll! lol
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Old 11-28-2008, 11:12 AM   #8
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All of the solutions I'm aware of are shipping.
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Old 11-28-2008, 11:20 AM   #9
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is there a hump/lump/bulge in the case bottom of the top left one? hard to tell but if so that one is bad.
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Old 11-28-2008, 12:23 PM   #10
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Yeah, the top of the coil (the ignitor part) is the only part of the coil that will visually show a failure, but its usually a catastrophic failure, not an intermittent misfire.
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Old 11-28-2008, 12:43 PM   #11
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I was wondering if the "white spot" on the rear was a sign of overheating or something and that they were on the way out. The 4 of them from my motor have the white spot. The one to the the right of the photo is one from my engine.

One other possibility is that it is misfiring due to being too rich. That wouldn't be the tuneup, as it is essentially the same tune-up I have been running for ages, and all my boosted pro-tuner customers are using the same base. If the tuneup was wrong, then surely it would misbehave every time I hit the "wrong" load points. I can drive for 300km and not have a problem, then it can came back again. It can be really bad, but then come good again. It always seems to be in the 3000-4000 RPM range when a bit of load is added, but you can drive through it (i.e past 4000 RPM or so) and it comes good again.

So if the tuneup isn't the problem per-se, and it is misfiring because it is too rich, then the only thing I can think of making it too rich is an injector/s sticking open. Has anyone had that?

The problem is the same whether I'm boosted or NA.

I might look at the LS1/2 coils, since they are plentiful here. I just got to find out more about the connectors/wiring harness.

Anyway - more fun... just to keep me from being bored LOL.

Cheers,
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Old 11-28-2008, 12:45 PM   #12
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Hymee: play process of elimination and just test each coil. If it were your tuning, I think you'd hear complaints from others using your software but since you haven't, I think you need to look elsewhere to identify what's causing the misfire.

If you've got a multimeter sitting around: http://www.finishlineperformance.com...16-07-1793.pdf
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Old 11-28-2008, 12:46 PM   #13
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Did you test them with a meter?
OK - I can't remember everything What is the test? Was it an ohms test?

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Old 11-28-2008, 12:49 PM   #14
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Hymee: play process of elimination and just test each coil. If it were your tuning, I think you'd hear complaints from others using your software but since you haven't, I think you need to look elsewhere to identify what's causing the misfire.

If you've got a multimeter sitting around: http://www.finishlineperformance.com...16-07-1793.pdf
LOL - funny timing our last 2 posts!

Thanks for that. I thought I had seem a bulletin like that some place. I thought I would have enough brownie points to get away with asking!

I'll check it out some more.

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Old 11-28-2008, 12:51 PM   #15
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no problem Mark, hope you find the culprit.
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Old 11-28-2008, 12:56 PM   #16
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The only thing "hard" about it is I don't want to have to drive 300km for it to present itself again - it is the intermittent thing giving me the *****.

Cheers,
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Old 11-28-2008, 01:22 PM   #17
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Oh. I thought this was a theoretical test (chumming the waters for trolls, as it were).
I didn't realize you needed a real test.

The ONLY test that is conclusive is the timing light.
The coilpack resistance test will only show a coil on its death bed, not one with an intermittent misfire.
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Old 11-28-2008, 01:30 PM   #18
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It always seems to be in the 3000-4000 RPM range when a bit of load is added, but you can drive through it (i.e past 4000 RPM or so) and it comes good again.
Ahh. Interesting.

I had almost this exact problem a few weeks ago (but in the 4800 RPM range) and replacing the plugs fixed it.
It would "hold back" rather violently and then "clear up" as soon as I got out of that range.
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Old 11-28-2008, 02:18 PM   #19
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Ahh. Interesting.

I had almost this exact problem a few weeks ago (but in the 4800 RPM range) and replacing the plugs fixed it.
It would "hold back" rather violently and then "clear up" as soon as I got out of that range.
Thanks. When I was asking Grandad for his advice, he said "What are you ringing me for if you haven't looked at the plugs!!" LOL. Sounds nasty, but it was funny. You tend to have respect for someone who has run 6's with rotors. There ain't many of them out there. In fact, I know of only 3 or 4 - but hey, I might have blinkers on.

The other thing about mine is that when this situation is "active", it often stalls at idle. When inactive, it is sweet.

I enquired about plugs yesterday. Parts manager dude advices $430 bucks a set. FFS! He reckoned Warren should be able to look after it. Warren T.

I've just moved my coil packs back to their "normal" location. I moved them close to the ABS to help fit the blower in. I was wondering if the leads were arcing or something, but I would need to be looking under the hood while it was happening to be sure. Just got it back together, and about to go for a looong test drive once I put the wheel back on.

Timing light sounds like a good idea, but it only going to tell me that it mis-fired. I already know that.

All I know it is either fuel or spark. There isn't much else that it can be in gasoline engines At least the air is free!!

Cheers,
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Old 11-28-2008, 03:09 PM   #20
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Thanks. When I was asking Grandad for his advice, he said "What are you ringing me for if you haven't looked at the plugs!!" LOL.
It is the easiest and most direct diagnostic we have on a motor. Sage advice!

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I enquired about plugs yesterday. Parts manager dude advices $430 bucks a set. FFS! He reckoned Warren should be able to look after it.
Just use RX-7 plugs. Cheap.


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Timing light sounds like a good idea, but it only going to tell me that it mis-fired. I already know that.
But it will show which coil and when. Just tape it to the windscreen and go for a ride.

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All I know it is either fuel or spark. There isn't much else that it can be in gasoline engines
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At least the air is free!!
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Old 11-28-2008, 03:34 PM   #21
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Well, I just took her for a drive up to Steve Irwin's and back. (Fair Dinkum!) No crocs reared their ugly heads. I really need to drive it for a week and see what comes of it. If it lasts a week or so, I'll try to shorten my coil pack extension bracket and see if I can insulate between the leads/coils and the ABS bracket.

Lots of fun.

Last time I used the term "cheap" (or what it dear?) on a US forum, I confused people! But I hear you. I'll try Supercheap then

Cheers,
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Last edited by Hymee; 11-28-2008 at 11:06 PM.
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Old 11-28-2008, 04:54 PM   #22
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I think you meant http://www.supercheapauto.com.au/
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Old 11-28-2008, 08:01 PM   #23
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you can always narrow the gap on the plugs a little--down to 30--see if that helps.
double check your wires--just a little jiggle in them can cause misfires---ask me how I know.
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Old 11-28-2008, 11:07 PM   #24
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Thanks for that. It was a funny mistake. I didn't think you'd even follow the link!!

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Old 12-02-2008, 07:33 PM   #25
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OK. So it seems the white spot isn't an indicator, even thought one of my local Mazda parts guys said to check for it...

Still there sometimes. Is it misfiring cause she goes too rich? Sticking injector? The quest continues...

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Old 12-02-2008, 07:33 PM
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