Test drove an '18 F150 5.0
#113
Senior Member
#114
Senior Member
I'd be all over that except I am fighting a P0305 - Cylinder 5 Misfire CEL ever since upgrading to the latest Whipple tune about 5 weeks ago. I swapped cylinder 5 plug with cylinder 7 plug and swapped cylinder 5 coil with cylinder 8 coil to try and narrow it down and am still receiving the CEL. Next step is to check the exhaust manifold bolts. The CEL normally show on cold start or idling for more than 5 minutes or so. 5 minutes is a rough estimate on the idle time that throws the CEL. This started happen right after installing my most recent Whipple tune and is the fourth Whipple tune to run so far. Coincidence, IDK. I need to get this sorted out before I get Ken to custom tune it.