Misfiring

sumdeus · 04-20-2009, 10:56 AM

Ok, so while running a night run at DGRR this last weekend, I threw a CEL at high RPM/full throttle. So I got home and got an OBDII scanner; the CEL is a P0302, rear rotor misfire. The scanner recorded the last occurrence at about 2200-2300RPM and around 27mph.

The CEL light will not flash as long as the revs are kept below about 6k. So what should be my next step to fix this misfiring? Its a 2007 with about 32k miles. Any help would be appreciated. If you need any more details let me know.

Edit: When the CEL does light up, the car falls flat. Power just dies (similar to hitting a fuel cut off or rev limiter).

Kane · 04-20-2009, 12:46 PM

New Ignition Coils, Wires and Plugs time.

It is a known weakness with the RX8 - coils don't last so long.

SPICcnmFD · 04-20-2009, 12:51 PM

Yep it doesn't take much to foul plugs in a rotary. Start with the cheapest possible fix and work your way up. I'd say with only 32k the wires are probably ok, but it wouldn't hurt to change them. Aren't bad coils a common problem on the 8s, at least the earlier ones??

sumdeus · 04-20-2009, 08:05 PM

If it is indeed the coils, anyone have any experience with the BHR ignition setup?

Kane · 04-20-2009, 11:05 PM

I do - it is great...The big upside is they will last a long damn time - and new coils are $20....

05rex8 · 04-21-2009, 08:39 PM

Quote:

Originally Posted by sumdeus

If it is indeed the coils, anyone have any experience with the BHR ignition setup?

at first I had lots of misfires with my turbo setup and the bhr kit...however there seems to be a fix for it and I will be trying it again

for N/A it worked fine as is
for turbo setups, apparently the dwell needs to be changed

Kane · 04-23-2009, 01:06 PM

Yep - dwell above 330-340 g/sec is not enought to light the higher density charge - but for NA they are fine.

Flashwing · 04-29-2009, 06:05 AM

sumdeus sorry to hear you've discovered the fact that the stock ignition system isn't up to snuff.

There's some great advice here in terms of going with the cheapest or cheaper replacement stuff first and then working your way up. Plugs are something that should be changed about every 25,000 miles to keep your rotary performing well.

The stock ignition coils are the weakest link of the whole system. While you can typically get a replacement of all 4 coils for around $140 with shipping retail, BHR does offer an alternative using the yukon LS2 coil which is higher quality and produces more spark.

If you're running an N/A setup, the kit is a plug and play solution. We've found there's some tweaking necessary should you go turbo or supercharged but those changes are not required with N/A setups.

I'd be happy to answer any questions you may have regarding the ignition system.

bose · 05-18-2009, 04:49 PM

I love my BHR coil kit. Fantastic especially in the upper RPM range's. But at any rate your ignition coil have had it. That much I'm sure of and change the spark plugs just for good measure. It's possible you could get away with just cleaning them, but I would do it just for posterity's sake.

04-20-2009, 10:56 AM	#1
sumdeus Rotary Fanatic Join Date: Mar 2008 Location: Florence, SC Posts: 148 Rep Power: 0	Misfiring Ok, so while running a night run at DGRR this last weekend, I threw a CEL at high RPM/full throttle. So I got home and got an OBDII scanner; the CEL is a P0302, rear rotor misfire. The scanner recorded the last occurrence at about 2200-2300RPM and around 27mph. The CEL light will not flash as long as the revs are kept below about 6k. So what should be my next step to fix this misfiring? Its a 2007 with about 32k miles. Any help would be appreciated. If you need any more details let me know. Edit: When the CEL does light up, the car falls flat. Power just dies (similar to hitting a fuel cut off or rev limiter). Last edited by sumdeus; 04-20-2009 at 11:05 AM.

04-20-2009, 12:46 PM	#2
Kane All about the O2 Join Date: Sep 2008 Posts: 295 Rep Power: 17	New Ignition Coils, Wires and Plugs time. It is a known weakness with the RX8 - coils don't last so long. __________________ My 2007 Turbocharged RX8

04-20-2009, 12:51 PM	#3
SPICcnmFD Rotary Fanatic Join Date: Feb 2008 Location: B'ham, AL Posts: 329 Rep Power: 18	Yep it doesn't take much to foul plugs in a rotary. Start with the cheapest possible fix and work your way up. I'd say with only 32k the wires are probably ok, but it wouldn't hurt to change them. Aren't bad coils a common problem on the 8s, at least the earlier ones?? __________________ 1993 Rx-7 SM2 #11 At the local AutoX: http://www.youtube.com/watch?v=9VOSQkkSLQs Speed for Sale shootout 2007: http://www.youtube.com/watch?v=JiqlyAkGmpg A few laps at Barbers: http://www.youtube.com/watch?v=6_h5q...x=0&playnext=1

04-20-2009, 11:05 PM	#5
Kane All about the O2 Join Date: Sep 2008 Posts: 295 Rep Power: 17	I do - it is great...The big upside is they will last a long damn time - and new coils are $20.... __________________ My 2007 Turbocharged RX8

04-23-2009, 01:06 PM	#7
Kane All about the O2 Join Date: Sep 2008 Posts: 295 Rep Power: 17	Yep - dwell above 330-340 g/sec is not enought to light the higher density charge - but for NA they are fine. __________________ My 2007 Turbocharged RX8

04-20-2009, 08:05 PM	#4
sumdeus Rotary Fanatic Join Date: Mar 2008 Location: Florence, SC Posts: 148 Rep Power: 0	If it is indeed the coils, anyone have any experience with the BHR ignition setup?

04-29-2009, 06:05 AM	#8
Flashwing The Newbie Join Date: Aug 2008 Location: Phoenix, AZ Posts: 27 Rep Power: 0	sumdeus sorry to hear you've discovered the fact that the stock ignition system isn't up to snuff. There's some great advice here in terms of going with the cheapest or cheaper replacement stuff first and then working your way up. Plugs are something that should be changed about every 25,000 miles to keep your rotary performing well. The stock ignition coils are the weakest link of the whole system. While you can typically get a replacement of all 4 coils for around $140 with shipping retail, BHR does offer an alternative using the yukon LS2 coil which is higher quality and produces more spark. If you're running an N/A setup, the kit is a plug and play solution. We've found there's some tweaking necessary should you go turbo or supercharged but those changes are not required with N/A setups. I'd be happy to answer any questions you may have regarding the ignition system. __________________ Black Halo Racing - We don't sell parts, we solve problems!

05-18-2009, 04:49 PM	#9
bose Member Join Date: Aug 2008 Posts: 13 Rep Power: 0	I love my BHR coil kit. Fantastic especially in the upper RPM range's. But at any rate your ignition coil have had it. That much I'm sure of and change the spark plugs just for good measure. It's possible you could get away with just cleaning them, but I would do it just for posterity's sake.