WhippleCharged '15 5.0 ... code & shudder
#1
WhippleCharged '15 5.0 ... code & shudder
Looking for some insight. I am getting a "Randon Multiple Cylinder Misfire" code (PO300) when I drop the hammer on my truck. I only get it at full (or almost full) throttle. Fuel mileage dropped waaaay off... power is not optimal ... I'm thinking plugs or coils .. I contacted whipple .. they want to update tune/reflash .. I really liked my last tune from them (been getting avg of 19mpg) .. until recently when this started ... I have 71,000 miles on it now.. had both cats replaced a couple months ago... I run 93+ octane only ... Boost gauge still shows 13PSI as it has since I put the smaller pulley on it. I ordered new NGK's to replace plugs .. next may be coils .. after that... me and whipple tech support may get to know each other.... My RWHP dyno'd at 647... I know right now i'm not there...
#2
#3
You might need need different heat plugs. Possibly colder plugs.
Here's some good advice:
https://www.ngk.com/learning-center/...ugs-heat-range
Although, Whipple should be armed with this information, especially since you are giving them the code and what you've got.
Here's some good advice:
https://www.ngk.com/learning-center/...ugs-heat-range
Although, Whipple should be armed with this information, especially since you are giving them the code and what you've got.