EFI Relay (91 FJ80) still overheating

[cqualia]

Still having problems with my EFI relay. I did the wire upgrade from 12 gauge to 10 gauge this morning, but the relay is still getting hot. If I drive for 10 or 15 minutes and then turn off the engine, it will not restart. The relay gets too hot to touch. If I put in another relay it will start. The two relays that I am switching between have both gotten hot. Do I need to get a new relay since I did the wire upgrade?

Is there something else that could be causing the relay to overheat?

 

[Beowulf]

I recall someone posted the p/n for an aftermarket relay that was heavier than the OME relay and that solved the poster's problems with overheating relays. Problem is that was a long, long time ago and I can't remember who posted... maybe Holmaas (landpimp)

I would suspect there is something else going on that is causing the overheating relay after the wiring upgrade. That is supposed to be a permanent fix for the 3FE relay problem.

Check for corrosion in the fuse box under the bonnet. At least 1 guy posted pics and he found there was a poor connection in the fuse box and that was causing overheating. Again, that was a long time ago and I cannot remember who posted the thread. Sorry....

You might have better luck searching the 3FE specific forums.

-B-

 

[landtank]

If both relays were in the system before the upgrade than neither might work properly. I'd start by getting a new one.

 

[cruiser88]

i know fj80 is totally different but my 62 fuel delivery runs straight in my fuse block no relay or anything

 

[jcj_78FJ40]

I don’t understand how going to a bigger gauge wire will help the relay. It is still going to pull the same amount of current. My guess is the wiring upgrade is more of a safety thing to make sure that the harness doesn’t burn up.

You can get aftermarket relays form Advance Auto. They are under $13 (I bought 2).

I was just having the opposite of your problem. My truck would not start when it was cold. It turned out to be a loose water temp sensor. It was pretty easy to find because it tripped a code. Is you engine warning light on?

 

[cqualia]

I put in a new relay and that seems to have worked. Two days with no problems.

 

[landtank]

I don’t understand how going to a bigger gauge wire will help the relay. It is still going to pull the same amount of current.

If you put a load on a wire that is too small in size you will actually increase the amp draw of that device. It has to do with supplying the needed amps to operate the device.

In this case I believe it's not the relay coil but actually at the contacts where the issue is. Too small a gauge wire will cause the contacts to burn out prematurely.

 

[jcj_78FJ40]

Is this the fix?

 

[jerseyfzj80]

check all conectors in system and replace as needed. the physical connector piece may be burnt which can cause the problem to occur had one at my shop this cured problem completely car has not had an issue for 9 months.