cajunlexus

Have a 2011 ISF with 16K miles, Joe Z intake /Exhaust, Sikky headers, and RRRacing tune. The last modification was the RRRacing tune approx 6 months ago.The car has been running fine with no problems... While driving the other day for just a few minutes, I was waiting in traffic the car starts to idle rough, as the traffic started moving the car continues to pop and miss definitely not as responsive as normal, in a mile the check engine light and traction light come on and the car goes into limp mode.. the throttle response is minimal; I can only get the engine to make 1500 RPM..
Ran an OBD2 scan and came up with P0300 misfire Detected on multiple cylinders and P0305 & P0306 (misfire detected on cylinders 5&6 ) . Changed the battery because it was the original and was getting weak at start ups. Added some sea foam and fresh gas ...any thoughts as to where I can start to try and fix this problem?

Tom2769

iTrader: (3)

I'm new to the ISF and haven't poked around on it mechanically yet, but in general for a car with COP coil packs: visually/physically inspect your coils and their connectors on cylinders 5 & 6. If nothing is obviously disconnected/burned/etc, try clearing the existing codes and swapping the coils from 5 & 6 with coils from 2 other cylinders (ex: swap coil #5 with coil #1, and #6 with #2, etc). Then drive the car until codes pop up again and see if you now have codes for misfires on the cylinders with the coils that were originally on #5 and #6 (in other words, misfires on cylinders #1 and #2 if you swapped them as in the example above). If the misfire follows the coils that were originally on #5 and #6, you have 2 bad coils identified - replace them with new. Or I could be completely off and there may be some known misfire issue with the ISF that I don't know about yet...

wmjeffreyw

Did you have any recall work done on it recently? If so, pull the engine cover off and check all the wire connections around the intake manifold.

cajunlexus

I haven't had any recall work done recently.. I looked under the engine cover and connections look good. Will try swap coils as Tom2769 suggested. When I searched someone had a car that he was test driving do the same thing however no fix was mentioned. I was curious if faulty O2 sensors would throw these codes?? or if the tune from RRRacing overrides the O2sensors ??

k20trick

iTrader: (3)

No, but a bad head from over revving can cause these codes (permanently until fixed). How high are you revving to?

cajunlexus

I have the 7200 rev limit with the tune but honestly I do not push the car to the limits.

k20trick

iTrader: (3)

Oh ok cool, I dont push it above 6800 either, have done so a couple times because I was stupid but really I only use the extra rpms to prevent from bouncing off the stock 6800 limiter.

Back on topic, I was only stating the last resort facts, if your o2 sensor was faulty it would've probably thrown a o2 sensor code along with the misfire code, but you didn't express that so yeah starting at the coil packs, plugs, etc would be the right way to go.

jspecvtec

iTrader: (4)

Do u have o2 simulators on headers with rrr tune o2 delete?

cajunlexus

I had the O2 simulators on headers when I had headers installed back in 2012. My next question would be which coil is 5 and 6 ? just took off engine cover and all the coils look similar AKA can't find one that looks a different color ..

k20trick

iTrader: (3)

After you installed the new battery has the code came back?

I know my car threw a weird code when battery was about to die I knew because I noticed my cranks were slow after the 3rd day it died and new battery fixed that issue.

k20trick

iTrader: (3)

Not sure about the firing diagram on these motors Im sure with a little research you can locate diagrams.

flowrider

iTrader: (9)

See attached.

Lou

cajunlexus

Thanks Lou !

cajunlexus

Yes installed new battery and car threw the same codes.

k20trick

iTrader: (3)

How soon did they come back? Instantly or after a drive out of nowhere like the first instance?