Poor spark from D585 coils destroyed OEM cat

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jenkiadr
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Poor spark from D585 coils destroyed OEM cat

Post by jenkiadr »

I bought a 40th Anniversary last year and on the drive back home from the dealer, the yellow warning light came on. Had it checked out by the dealer's recommended rotary specialist and it turned out that the cat was completely shot. Replaced the existing Mazda coils with D585's, fitted new leads and put on a second-hand OEM cat. Engine light kept coming on and off and was reassured that it was a sensitive O2 sensor. Took the car in for recall work to the local Mazda dealership and asked them to look at the warning light issue and they said that the cat was completely destroyed – had only had on the car for about a 1,000 miles. They cited the issue as being with the coils as there wasn't enough fuel being burned in the engine and fuel was getting thrown down into the exhaust system that was then getting hot and eventually destroyed the materials inside the catalytic converter. As I didn't want to pay the £2,500 the dealership wanted to put everything right, I took it to another rotary specialist closer to where I live, who concurred with the diagnosis and was able to demonstrate to me while I waited the incredibly weak spark that was being produced by the D585s. Had proper Mazda coils fitted that the specialist insulated, new Magnecor leads and another second hand OEM cat. When I then drove the car again, I was utterly astounded – it was so much more drivable with more low-end power. It has really transformed the car and increased my enjoyment of it. Sadly that's come at a cost of over £1200 and it's basically all down to the shocking quality of the D585 coils, which I really regret having bought. I would never put them in my car again and strongly advise others to steer clear - not only did they reduce the performance of my car, they also caused damage that was expensive to put right. Has anyone else had similarly poor experiences with D585 coils?
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Re: Poor spark from D585 coils destroyed OEM cat

Post by 13Black »

They can last for a long time but equally some variations of them last a disappointingly short time, less than 10,000 miles sometimes unfortunately.
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Re: Poor spark from D585 coils destroyed OEM cat

Post by mi60o0 »

I like the oem coils this is the reason I bought my coils leads and plugs from Clive.
He import from Japan and you know you get oem stuff some stuff cost a bit more with him but you are guaranteed you get oem quality.
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Re: Poor spark from D585 coils destroyed OEM cat

Post by warpc0il »

There's a huge variation in the quality of D585 coils, from the real ACDelco factory products to Chinese knock-offs that wholesale for $3 each, and everything in between.

Sellers that say they have "a x-year warranty" doesn't mean anything if it's just a con to get you to buy from them.

The wiring loom adapters (short cables with connectors on each end) are also a weak link in some kits, so the coils don't stand a chance.

Even when fitting, if you don't make a good job of the additional earth connection then you're going to be in trouble down the line.

Quality HT leads come with caps that can be such a firm fit over the spark plugs that it's not obvious when they're not pushed on far enough to actually clip onto the end of the plug, and don't make a good electrical connection. I've seen this too many times to count, with both D585s and good leads on OEM coils.
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Re: Poor spark from D585 coils destroyed OEM cat

Post by PeteH »

D585 is a catch-all for a huge variety of LS1 coils of various qualities. You can buy very cheap ones for a few pounds, or very expensive ones. Mine have been great on my race engine that spends most of its time between 7,000rpm and 10,000rpm. It's just like the OEM style coils, you get what you pay for.

It does seem that some people have been making profit by selling cheap D585 coils for premium money. If that's the case then it's a huge shame.

The best way to be safe is to buy from trusted places. Mazda OEM c-spec coils from MRP are one option. And RRP's coils are another great option. I'd only buy D585 if I knew for certain, and trusted, the actual manufacturer of the coils.
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Re: Poor spark from D585 coils destroyed OEM cat

Post by willberry70 »

I was lucky I swapped out my old coils for RRP Mk2's, before too much harm was done. As well as much better low end pull, I also go 10% better MPG and a faster start. So you should get those benefits too. So like everyone says, they are critical.
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Re: Poor spark from D585 coils destroyed OEM cat

Post by V8 Power »

When we bought our R3 I was going to replace the coils as a matter of course to ensure the ignition system was in pristine condition.
I pondered what to go for and considered D585’s as well as other options. In the end I went for OEM spec C from MRP. I have been happy with this choice and feel confident that they won’t let us down.
My tack car has BHR 585 style coils, I’m not sure of the mileage on them or the history as there was some confusion (on my behalf) during the various builds so I am not 100% sure they are the ones I originally purchased.
I have now purchased some RRP MK2 to give me total confidence in the ignition and remove the slight doubt in my mind of the current set ups history.
If it has not been for this confusion I would have been happy to stick with them as they have been faultless.
One of the most important things for anybody buying an RX8 is to make sure they have decent coils from a reputable supplier.
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Re: Poor spark from D585 coils destroyed OEM cat

Post by New Duke »

Who was the dealer's recommended rotary specialist that originally fitted the D585s that failed?
(First time I've heard of a dealer recommending going to a rotary specialist before. Do you mean general car dealer, or Mazda dealer? )
And was it made clear to you which D585 coils they were? Did you ask?

But yes, in a sense you're right. The urban myth that D585s are an upgrade and a reliable one is just that. It's more nuanced as has been explained above.
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Re: Poor spark from D585 coils destroyed OEM cat

Post by acegeezer »

I fitted D585's from RR over 5 years ago and did 55k on them .. faultless :thumleft: .. sometimes, as stated luck of the draw ;)
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Re: Poor spark from D585 coils destroyed OEM cat

Post by nightfire10 »

Mine are 585's from rr on the car when I bought it so about 5 years as well

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Re: Poor spark from D585 coils destroyed OEM cat

Post by casey »

Correct me if im wrong please, but I seem to recall RR changed the supplier of their coils at some stage? Is it possible the original supplier's coils were more reliable than the later one?
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ChrisHolmes (Wed Oct 02, 2019 9:03 pm)
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Re: Poor spark from D585 coils destroyed OEM cat

Post by warpc0il »

Stringing together the stories I've heard over the years, I *think* RR changed suppliers at least twice.
The first because of product issues and the second for commercial reasons.

I understand that they worked with one of their suppliers to address quality/performance issues.

However this is all hearsay.

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Re: Poor spark from D585 coils destroyed OEM cat

Post by casey »

I think the conclusion is that not all D585's are the same, as has been stated above. There are some quality manufacturers, some cheap Chinese knock-offs and everything in between, all marked as D585 parts.
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Re: Poor spark from D585 coils destroyed OEM cat

Post by zippyonline »

I believe my car has gone through the exact same process as the OP, with Rotary Revs D585 coils (that in hindsight, I purchased them from someone who had used them for not many miles and had a blown engine...and was running a decat).
Fortunately I think having read the stories of others, and checking my CEL immediately, I have a RRP coil kit to go on which I hope to remedy this.

Only shame is the replacement cat doesn't sit as nicely as the OEM cat, so I'll have to play with the welder and swap hangers about.
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