Just as it gets cold and snowing my 4Runner starts to get electrical gremlins.

I spent hours working on it last night, pulled all the wiring out tried to find the culprit, could see any problems, put it back together making sure all wires were insulated and it fired right up. Ran last night. Got my wife to work this morning. Tonight wouldnt start.

Any ideas? None of the fuses protected by the 30A have blown so it has to be between the ignition switch and the 30A fuse. Looks like there is almost a dead short to ground because it measured 29 ohms last night. Then suddenly back up to 65 ohms which is the efi relay coil to ground resistance.

Wife is PISSED. I am pissed. 3 years we've had this vehicle, bought for the sole reason of winter beater. It has seen ONE DAMN DAY of snow.

 

Anyone ever have a bad noise isolation capacitor?

I cant figure out where the fault is. I replaced the fuse after checking for a short and it has worked ever since. Tugging, pulling and twisting of every wire I can reach has made no difference.

I am seriously considering replacing that entire circuit with new wire and cutting the old. The common points left would be the 30A fuse, the ignition switch, the noise cap and the 6 injectors. I could have it completely rewired in about 3 hours.

 

It would appear that mice are the culprits. Little bastards!

 

LOL. better get a cat!!

 

I am have the same problem on a 94 runner. Turned it off and then went to restart and now it blows the am2 fuse. Do you know were the noise cap is? I have unplugged everything on that circuit ( I think) but the injectors so far. I may have to order the dealer wiring book. PITA tracking wiring problems

 

Noise cap is over on the inner fender on the drivers side. It is a small rectangular black device with 2 black wires.

 

Thanks for the reply. I unplugged everything including the ecu. I ended up getting the wiring diagram from Techinfo.toyota.com. One of the positive injector wires wore through the harness under the manifold and shorted on the metal harness rail. Some one prior didn't use the clips and let the harness sit right on the rail bolted to the valve cover.

 

Thats quite common from what I found out when I was researching this issue.
I'm going to check mine when it warms up as I need to take the upper manifold off anyway to replace a leaking gasket.