P309 code

[Redtruck-VA]

The Code is P0339, not P0309


I hate failures! My LP external monitor sensor died and it uses 5vdc, grnd and a signal output. I connected this external monitor sensor to the OEM LP sensor wires, because it was there and convenient to get at. The external sensor doesn't read any longer and I really don't know what died internally. But I initially assumed it didn't short the wiring so I temporarily left it connected. And started tuning using the PSC1. Took the adjustments to the extremes to see what i had to play with. Started throwing Crankshaft sensor intermittent signal codes (P309). Went down my list of what have I fooled with recently. Unfortunately the list is long. Rolled the tune in for a very nice idle, Cleared the code and removed the connections for the external sensor, thinking it may be screwing with the 5vdc sensor source. Nope the code came back and there is a slight stumble at 2000 rpm that sets the code. So I am now thinking there may actually be something wrong with the crankshaft sensor. I raced last weekend and didn't have any codes and this only popped up while i was tuning the other day. I'll let the engine cool down over night and remove the sensor tomorrow and inspect it. Of course when you are tuning you want to associate everything with what you are currently doing, but at the moment it really appears I have a faulty sensor. Anyone have any experience with bad crankshaft sensors?

Thanks,