I have a 93 civic cx that I was swapping a d15b2 in. The car previously ran with a z6 and boosted for 2 years till I sold the swap and got this for a temporary beater. The car started up when I finished and drove it for about 5 miles then it just shuts off. ECU fuse blew and then I put in another one and it blew when the key is turned to the ON position. Switched my friends p28 in and it starts up and drives for less than 5 miles and it does the same thing. Plug up my firends and my ECU in his running car and both ecu blew his fuses. Any ideas? I have a CEL cause im not running an o2 sensor.

 

I would double check all wiring connections are in their proper locations and double check any hot wires going into the ecu for shorts

 

What exact fuse is blowing. Post a picture or the fuse number.

Are you saying that installing your ECU in your friend's car also causes the same fuse to blow in his car?

 

I am pulling the engine harness tomorrow to inspect each wire. It is the fuse in the top left corner of the fuse box in the bay, the cover says its the ECU fuse.

 

 

Yeah it blew his ecu fuse in his car too, even with his ecu he let me borrow to test my car. Now hes out an ecu like me. So i think something is frying ecu's in my harness but shouldnt the ecu fuse stop that from happening?

 

...or your ECU was the problem.

Use a multimeter to test for continuity to body ground at the ECU fuse with the ECU removed.

 

Are you using a known good distributor?

 

You see...........this is why we tell you guys to diagnose. Swapping parts isn't always going to help. So you have a short somewhere. Gonna have to do as Ron says.

 

Ok I will try your tip Ron, so I just probe the slot where the ecu fuse is suppose to be with a multimeter? And it was the same ecu I was using when I had the z6 turbo, and my friends ecu was also running fine too.

 

Does the 15A ECU fuse only blow when the key is turned to ON(II)?

 

Yeah it is, I think both ecu's are fried cause we used both ecu's in my buddy's integra and it blew his ecu fuse also.

 

Would you like to do some electrical tests to pinpoint the short?

 

Im never good when it comes to electrical but I already got the engine harness out and Im inspecting every single wire and will report back.

 

If the fuse still pops after reinstalling the harness, the electrical tests are simple and easy to learn.

 

you say no 02 sensor? check your o2 sensor plug since im guessing its just dangler down there it might have got frayed or something

 

Sorry i havent checked back, i been busy building an lsv turbo. But i realized the injectors i was using at the moment were high impedance and I still had the resistor box on the plugs since from my old swap i had dsm 560. Would that cause the fuse to blow? If not, i dont remember if i screw down the ground wire that comes from the harness to the fuse box, would that blow the fuse?

 

I checked the o2 sensor that was on the header and it was touching the radiator and front radiator support, idk if that will blow the fuse since its just an o2 sensor thats not plugged in due to my plug from the harness doesnt reach. I assume it will blow if the wires for the o2 sensor from the engine harness touches the chassis but unsure if the o2 sensor by itself can do any harm?