Thread: Misfire codes above 2700 RMP
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Old Apr 15, 2025 | 10:30 AM
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taschwen
Joined: Mar 2025
Posts: 7
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From: Draper, Utah
Default Misfire codes above 2700 RMP
I have a 2006 Crossfire Limited with about 103000 miles. I runs and idles great, but when I increase the RPM's to above about 2700 rpm, the check engine light comes on with P0300, P0301 and P0306 - misfire codes. Here is what I've done:
  • Engine compression test - lowest was 165 psi (only one) others were all around 170 to 172 psi.
  • replaced Cam shaft and Crank sensors - with Bosch
  • I didn't change the spark plugs, they look new
  • checked coils - exchanged coils around to different cylinders, but still got the same codes
  • checked for blocked cat's (first I disconnected them, and then even put it back together and tried just taking out the O2 sensors)
  • checked for vacuum leaks and replaced old cracked hoses (I did not do a smoke test, but may if you think it is necessary)
  • When I got it, it was missing the EGR valve, but I got one from our local pick-n-pull and installed it
  • O2 sensors seem to be working.
  • Fuel pressure is at 55 psi
  • I had the fuel injectors cleaned and tested
Anything else??

Any suggestion would be greatly appreciated!!
 
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