calle0804

I have a 2004 RX8. Just recently I was driving it down the road and it shut off randomly. As I pulled it into the nearest gas station it wouldn't start back up. Once I charged the battery it started up but started to misfire and sounded like it was going to die. Oil is fine, replaced all the recalled things, just changed all spark plugs last summer. When I ran the diagnostic test it showed cylinder 1 misfire and also too lean??.. Any ideas?? Some guy told me I needed a whole new engine.

Loki

iTrader: (1)

Some guy might be right. But before we jump to that conclusion, how old are the ignition coils? This is the number one thing to watch on these cars. I'll almost guarantee one or more have failed and all 4 need to be replaced.

BigCajun

iTrader: (1)

Was some guy an actual mechanic?

Check your coils first, if you haven't changed then in the last 30k, it could be that.
https://www.rx8club.com/series-i-tec...t-here-222280/

calle0804

This guy was a mechanic out of his garage, but I was mostly looking for a second opinion.
As far as the ignition coils go, I don't think I have ever changed those.

Loki

iTrader: (1)

Coils kill cats, cats kill engines. So get them checked, replaced and the cat inspected. How has the car been otherwise?

gwilliams6

Starting the Engine
• Starter
• Battery
• Engine Compression
• Grounding Wires
• Ignition Coils
• Spark Plugs
• Spark Plug Wires
• Fuel Pump
• Fuel Injectors

You have a number of options for coils:
- The Cheapest option: BWD/Intermotor coils from auto parts stores like Advance Auto. 4 coils, 4 plugs, and 4 wires can be had for around $190-220 total based on whatever promotion is running at the time, shipped to your door for free. They are considered to be the first coil revision and you should expect to need to replace them around 20,000 miles, 30,000 miles max. They often come with a "lifetime warranty" by the auto parts store, which could potentially be leveraged for perpetually new coils.

- The Best Upgrade: The BHR ignition coil upgrade can be had for around $500, which eliminates the need to continue replacing coils periodically, as well as deliverying a significantly stronger spark for minor mileage and power gains. It is a proven kit with top notch customer service supporting it. It includes the wires, you still need to add plugs ($80)

- The For-Sure OEM: Mazmart sells all 4 coils of the latest OEM coil revision (C) for around $250, (just the coils, you still need to add plugs and wires) Supported by top notch customer service. They will likely last longer than 30,000 miles, but we don't have much solid data on how long the latest coil revision will last.

- The Most Expensive option: Buying from a dealer will run you around $300+ for the coils, $500+ for coils, wires and plugs, and if you have them do the install, expect to get a bill for anywhere from $700 to $1,800. You may not get the latest coil revision. Yes, you are getting shafted if you take this option, so bring lube.

- The Highest Risk option: Ebay coils continue to pop up as counterfeit, mislabeled, dead on arrival, and have zero post-purchase support largely. They are the "cheapest" listed price, but when you add that $92 or whatever to the price of anything in the list above from having to do it over again, you can see that they are no longer the cheapest option. Do it right the first time. "Motor King" coils are popping up at an attractive price on Ebay, but are being proven as ineffective, to the point of being unable to get the engine fired. "Mazda" branded coils on ebay are almost always counterfeit. Check the seller's name though, since some of our vendors sell legitimate coils there. The price will be $200+ though. Anything sold as "Mazda OEM" under ~$26 per coil should really be considered as suspect and probably counterfeit.

Be wary of "LSx D585 coil upgrades", as not all D585 coils are created the same, and the standard generic D585 coil is not properly designed internally for the RX-8's ignition needs. They generally "work", but there are anomalies and performance issues that have to be solved, if they can be solved. Definitely NOT a plug and play option, even if it is advertised as "plug and play"

GB: SakeBomb Garage IGN-1A Ignition Coil Kit
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