So I bought a 2006 F150 stx reg cab with the 4.6l motor with 90k miles on it a few weeks ago. It was in really good condition and I couldn't pass the deal up. All in all, I love this truck. However at idle the truck is a bit rough. No check engine light, but a bit rough non the less. So I hooked up my obd2 torque app and I see I have anywhere between 6 and 60 total counted misfires, but none detected by individual cylinder. So I ran a scan and have a B1360 code without the CEL on. So I changed the plugs and coil packs and cleaned the k&n filer (non cold air filter, just a replacement k&n) and I still have all the symptoms and the b136p code. So I Google the b1360 code and there's very little on it. Basically says open circuit ignition. Any ideas? Thank you.

 

Any B-series DTC is going to be non-MIL since it's not related to emissions performance.

However, if your ignition system power is not stable, perhaps to a flaky power relay or other intermittent electrical connection, it *might* tie together your driveability symptoms with the DTC you read.

I'd start by checking/cleaning the contacts and female connections for the following: PCM Power Relay, PCM Power Diode, all fuses in that circuit. You might also swap the PCM Power Relay with another identical relay that is not critical to engine operation.

Good luck!