i hav a 87 crx si (fuel injected) i need to know wat the electrical relay looking thing bolted to the top of the left wheel well ( from drivers seat point of veiw) in the engine bay is called. it is suposed to turn on and activate th PGFI light on the dash but wen ever it gets hot outside the device is not turning on neither is the light. on cool days it works like new. stuck on hot days please help

Is it silver looking and about 1" thick and approx 2x4" in size? Follow the wires and it will lead you to the answer. In short, It is the resistor box for the fuel injectors. What it's real function and how it works I can't explain. I've never opened one up. It's connector C26 in the wiring harness according to the manual and just states-To Resistor.

If it is a starting issue when hot it will most likely be the main relay. It is found under the left side dash on the door side. In behind the fuse box. It says main relay right on it. If you let your car sit and cool down does it start after about 15 minutes? Spray some air in a can on it next time and the cooling effect should shrink the solder to start agian. It's a typical Honda/Acura problem

Methods of fix are:
1. Buy a new one
2. Take it apart and resolder all the joints as they deteriorate with age and only work when cold. You will see discoloration on the board. If you are not comfortable take the circuit board to a place that will do the solder work for you.
3. Find one from another car in a junkyard and give it a try. Sometimes they work and sometimes not. Make sure it is the same one as you currently have. JS

Is it silver looking and about 1" thick and approx 2x4" in size?

And look like a silver twinkie?

And look like a silver twinkie?

Alexander, Are you making fun of me?? Since I don't eat those silly things, they must be rectangular in shape? I do know what wagonwheels are and I don't eat them either!

So, do you know what the little box really does? If it's a resistor box and it connects to the injectors it hopefully has to do something with how the pulses go to each injector or how much of a pulse or like the old style regulators cars used for the charging system. Somebody must know and I would be interested to find out. Jerry