Hi all! I noticed today for the first time, that there is some kind of red plug on the front of the engine, on the right head. It looks like it used to have wires going to it, but they seem to be broken off. Could this be a sensor for the ECU? After about fifteen minutes of driving, the ECU light comes on. It does not go off. After the car has cooled, start it up, the light is off, but comes back on when the engine warms up. Can anyone shed some light on this thing? it does not show it in my chilton manual, but I figured someone on here knows what it is. Thanks in advance,

 

Jon

what year is your car and is it spfi, turbo, carb?

Jon?? Since you have the Ultimate Children's er er er Chiltons manual, why do you not check the codes stored in the ECU??

They may give you a clue as to the missing component.

(I have never seen a "red connector" but you could be talking about your 93 Blazer or whatever?)

If you want help on solving the engine check light here is another place to do some reading (please do not be confused by the header it is for 93 Blazers er er our vintage Subarus

Hope this helps

Old Gen Subaru Error Code Reading

MilesFox-1984 ea81 1800, single barrel weber carb. not origional engine as far as I know.

 

skip-I can only find one set of diag. connectors, they are green and the contacts are set up in a "T" configuration

 

--| like this.

 

I plugged them in, and checked codes, it sayed "ignition pulse system" with the connectors plugged and unplugged.

I have an '84 BRAT, sitting out in the driveway. I can look at it later, when the Sun arises. Can you be a bit more specific as to it's locale? The connection that is. On top of the engine, on the front of the engine?

It is on the front of the engine.

No Red plug on the front of the engine. Bet it is the block heater myself. Mine has one, but it doesn't look to be red, but its way dirty too.

Block heater plug. 3 wire connector with a boomer-rang shape?

Sound like a block heater. My '83 GL-10 has one.