Looks like a relay but what does it do ???

Willie Two · Post by **Willie Two** » Sun Oct 28, 2007 11:08 pm

On my 84 B2, there is what looks like a relay mounted just below the starter solinoid on the pass. side fender. Internally it is all solid state with no coil or moving contacts. When I unplug this " burn't " item the truck seems to run ( idle ) the same. Can someone tell me it's function ?? My truck has a carb and mechanical fuel pump. Thanks to all who reply. Bob

Ruffinit · Post by **Ruffinit** » Fri Nov 02, 2007 7:40 pm

If it's on the passenger side mounted close to the vacuum switches on the fender it should be your MAP sensor.

Willie Two · Post by **Willie Two** » Sun Nov 04, 2007 5:53 pm

It is not the map sensor, it is a typical 5 pin Ford relay I am just wondering what it's function is. I now have plugged in a new relay and as previously mentioned the truck seems to be the same with or without it.

ranger5.0 · Post by **ranger5.0** » Sun Nov 04, 2007 7:42 pm

The relay is to run one of the fine emission switches on your vehicle. You can easily bypass it along with the vacuum switches if you are in off road only mode.

Willie Two · Post by **Willie Two** » Thu Nov 08, 2007 10:28 am

Thanks guys, I have found that it seems to be also tied in with the electric choke element which cycles on & off when the key is in the on position and / or truck running. Pull the relay & the choke no longer has 12 volts applied to it, I also see that this relay controls the time the voltage is applied with an on again / off again pulse. ( Canada winters / gotta have the choke

)