You installed a 88 ecm with vatts to a 86 Camaro iroc z28 that doesnt what do you need to change in your wiring to get this engine running?

Answer 1

Do you have the original key that goes with the vats system? I had a problem with my 1992 camaro not starting and it was because of the vats system. The key has a chip in it and when you insert it into the ignition the vats reads the resistance of the chip and if it is the right one it then sends the signal to the ECM telling it to start the car IE:fuel pump on priming the engine and giving power to the ignition and starter.If the vats does not recognize the chip in the key you will get nothing when turning the key.Sometimes, as these cars get older and the ignition switch gets worn out the chip in the key doesn't make contact in the ignition switch and the vats gets no signal so the car wont start.What I did, as an alternative to replacing the ignition switch is...Take the key and your multimeter and find out what the resistance is of the chip in the key.You do this by touching one side of the chip to the negative and the other side to the positive(you might need someone to hold the key for you while doing this because it is so small and takes three hands to do it) You find out the resistance and go down to your local radio shack and buy some resistors that put together would equil the resistance value you got from the chip in the key.Solder them together end to end and take your multimeter and check that the resistance is the same as the chip on your key by placing the positive on one end and the negative on the other(should read the same as the key did )You then go under the dash and trace the wires that come from the ignition that go to the vats.I think they are purple and black.You then unplug that wire and cut the plug off of the end leaving yourself a few inches of wire on each side of the plug.Tape up the wire ends of the wire coming from the ignition so there is no exposed wire showing. Take the plug that goes to the vats and solder the resistors on it( one end of the resistors to one wire, and the other end of the resistors to the other wire)Take your multimeter and check the resistance(if you did this correctly it should be the same as before when you soldered them together and should read the same as the key)If it is correct take some electrical tape and tape it up,starting at one side where the wire is still shielded and ending at the other side where the wire is still shielded.Get back under the dash and plug this back into the vats system.Remember that by doing this you have basically by passed the factory anti theft security system and now any key(as long as its keyed to the ignition switch and can turn it) will start your car! The cost of this fix was $.99 cents for me VS. the high cost of a brand new factory ignition.And no one knows that the "VATS"system is disabled by just looking at your car unless you tell them!If it is the vats that's stopping you from starting the car this is a for sure fix. I got this mod from the third generation web site where it will explain the diods and has a chart with all the technical numbers !