86 Camry blowing fuses right in my hand

[jaylaisaiah]

I need help!!! I have a 1986 Toyota Camry that keeps blowing Efi fuses as soon as I turn the key in the ignition and it is blowing the ECU B+ fuse right in my hand when I try to replace it. Some background info I drove the car one night, it was runing low on gas I stopped got some gas headed on parked. The next day went out to leave and had a hard start(not unusual) had to crank twice car fired up and we back out of the drive way drove a couple of feet and car just died. Nothing worked but the caution lights. Checked the alternator wires at the bolt looked fried. I changed them out using wires from a spare alternator I have. All the lights and everything started back working, but car still will not start. It cranks and turns over but will not start. Sprayed starter fluid into the air filter and car starts but stops after I stop spraying. Figured it was the fuel pump so i have unplugged it, still it blows the fuse. Unplugged the injectors still it blows the fuses. I have not found any grounded out wires so what else could be causing this any ideas would be appreciated as i have ran through about 12 fuses.

[Doctor J]

Check the wires around the main relay.

[jaylaisaiah]

Do you mean the main relay under the hood?, today I checked those wires and saw that there were some burn spots on the insulation around the wires and the plugs but the wires looked good. What exactly should I be looking for I saw no spots in the insulation that was down to the metal?. If i were to find the problem spot what would be the best way to remedy it?. I also was told by someone to check the wire to my oxygen sensor. I found that the wires there were melted badly in some spots so I unplugged it but that does not stop the fuses from popping, if this were the problem do I have to change it to stop fuse from popping or can it just be un plugged?. I know I have got a ton of questions I am just trying to eliminate some possible causes.

[toyomoho]

Look for wires that have melted togther resulting in a short. See if your town library has any wiring diagrams for this year. If so find out what circuits operate off this fuse, then disconnect them.

[jaylaisaiah]

Toda y I located the ECU under the center front dash I found three plugs with multiple wire connected to each one I unplugged all three. Cranked the car and the fuses stopped blowing, so I decided to put back in the three plugs on by one the first small on did not blow fuse, the second one did not blow fuse, the last one blew the fuses again. Does any one know what this means. Is the whole ECU bad or is it something on that particular plug that is the problem.

[wiccanferret]

Follow that particular wife and see if you can find a melted spot. It may be as simple as splicing in a new wire or using some electrical tape to re-insulate it.

[toyomoho]

Does the ignition system have spark? Use an ohmmeter to find the connector terminals that are grounded and could have a short.

[toyomoho]

The B+ fuse wire appears to only run to the ECM. The wire color appears to start out as White/Red and shift to White/Blue after going through a connector. It is possible this wire could have had its insulation melt and the wire become grounded.

The ECU also connects to items such as the air flow meter, water temp sensor, ISC valve, throttle position sensor, injector circuit, igniter circuit, air valve and 02 sensor among other things. It is possible a wire running to one if these circuits could have been damaged causing a short.