I have 85 c4 motor and ecm in my 81 monte carl and the ecm vats system want let me start car

You may be able to get that from one of the auto part stores online, or at the library. There are retail auto repair books for that year with wiring diagrams in the back.

If the fuse is getting hot, you most likely have a bad connection in the fuse block. It will be necessary to repar the connection so it makes good, solid contact with the fuse. There are fuse block repair kits available through most AC Delco parts suppliers or at the local GM dealership.

If you have power but the starter won't engauge here are a few things to check 1 start at the fuse box check fuses. If the fuses are good check the starter. This time of year cold weather starters have more strain and burn out easier. Also exessive oil dripping on the starter can cause to go out because of residue build up in the starter. If the starter checks out good it is then a bad conection or wire. thanks

The passlock is having issues try this procedure and see if it helps. If it does not the passlock and ignition tumbler may need replaced.

PASSKEY LOCKOUT RESET ALL GM CARS 1999 AND UP
1) Put the key in the ignition and turn to the "ON" position. Leave it that way for 10 minutes. After 10 minutes turn the key and take it out. Repeat this process (2) more times (3 times, 30 minutes total) This should reset the PASSKEY system to recognize your key.

The security system (VATS/PassKey) is having problems, it's typical on those cars/years. It's been a nightmare for us. You can find a great write-up here: http://newrockies.ca , it was the only thing that saved my 94 Park Avenue that has the same security system.

The security system (VATS/PassKey) is having problems, it's typical on those cars. You can find a great write-up here: http://newrockies.ca , it was the only thing that saved my Park Avenue.

The security system (VATS/PassKey) is having problems, it's typical on those cars. You can find a great write-up here: http://newrockies.ca , it was the only thing that saved my Park Avenue.

i would get the correct key... most locksmiths carry the GM keys

The security system (VATS/PassKey) is having problems, it's typical on those cars. You can find a great write-up here: http://newrockies.ca , it was the only thing that saved my Park Avenue.

 Electronic control module (ECM) computer circuit problems - faulty programmable read-only memory (PROM). OR (Transmission) Input or output speed sensor - circuit problems. (Speed sensor signals do not agree with with selected gear range.) OR Torque converter clutch (TCC) - TCC is mechanically stuck on.
 Vehicle anti-theft system (VATS) problem. OR Transmission Temperature Sensor (TTS) - short circuit problem in sensor or wiring. OR Transmission fluid temperature high.