Hail Mary question for a Scorpion 350 DTS
 

So I have been battling with a check engine alarm ghost (I’ve heard of some others that could never get theirs solved) but in other news I took it out to lake test after I did a tune up, so far it has new plugs, cap, rotor, sensor for the rotors or ign sensor inside the cap, new map sensor and 3 new O2 sensors. It ran fine for about 25 30 min then began idle rough and wouldn’t hold a constant high rpm either, it sounded almost like it was missing. Spark adv on my scanner said 4.5 to 5 deg, and was showing some miss fire bumpers on cylinders. I added good premium fuel and check the fuel filter which is new and it has a new fuel regulator....vacuum line from regulator looked good also.

It’s only throwing 1 code, which is Cam position sensor fault, I replaced it, same code almost immediately, tried another new one with shims, no dice.... any body experience this before ? Sounds like timing which I know the cam sensor and ign talk...but I am not able to figure this puppy out. Any help would be appreciated before I go to the shop !

Thanks!

7073543601 text if need be

The timing was off due to a bad (brand new) ignition sensor/switch in the cap, also had one faulty brand new plug, thus messing with timing and the ecm “thinking” the cam position sensor was bad...hopefully this thread helps someone in the future !

Good deal and thanks for coming back and stating what was wrong. I hate it when people don't come back and say how they fixed it.

nice work diagnosing it.

how did you narrow down which plug was bad? or did you just replace them all?

I have a diacom and saw a misfire on plug six, swapped plugs with 8 and then showed a miss on 8, new plug and it is now good to go