I have two codes 12 Direct battery input to pcm was disconnected within the last 50 key-on cycles and 51 Fuel system lean.I was wondering how do you fix these? When I push on the gas very easy it has a bad miss to it I changed the plugs and plug wires what could cause this?Also when Iam sitting somewhere it starts to overheat it goes almostthe whole way tohot but then my fans kick on and it goes back to normal, when Iam cruisin around the temp is fine.

 

for the overheating problem, you temp sensor might be going bad, coolant might be a bit low, radiator might be shot......
12....dont worry about it, disconnect the positive battery clamp for a while and then hook it back up, or go sumwhere that can erase the codes.....
51....could be a bad 02 sensor

 

Thanks alot man But how would i know which 02 sensor would it be the upstream or downstream.

 

or a bad coil pack

 

up strean is located in teh exhaust manifold down stream is down by the cat.....in my opion the missing is caused by a faultly map sensor...but there is so many different things it could be

 

you can take it to Autozone and they can scan it and tell you if its bank 1 (upstream) or bank 2 (downstream)

 

Itsthe downstream 02 sensor so thats what is probably causing the missing

 

now whenever you push on the gas it will stay at those rpms for a couple of seconds and then go back to normal ideling