i have an 90 obd1 b20 civic si

PROBLEMS: Wont start, the relay wont click, check engine light,keep blowing my 15a ECU fuse, and no fuel pump

i just replaced the main relay with Part # R3264 at oriellys on my receipt it says its for a 1.5 civic not the si. not sure if it matters but i put the new relay in and it didn't do a thing still no fuel pump. and every time i turn the key to the ON position i blow my 15a ecu fuse.


WHAT THE HECK COULD THIS BE???? what i thought would be a simple fix is turning into a big headache

 

check for a ground wire shortage...and what you mean no fuel pump? not priming?

 

yea its not priming

 

checked my ground it was good

 

my battery is pretty much dead after doing so many tests............. so i can hear my fuel pump turning on when i try to cranking it.

 

Its gotta be my fuel pump right? its obviously getting power but its not priming. But why do i keep blowing my ecu fuse?

 

Unplug the PGM-FI Main Relay, [fuel pump relay] and turn ign. on and see if ECU fuse still blows, if not then either the fuel pump, fuel injectors or one of the engine sensors powered by the PGM-FI Main Relay or the wiring to the above has a short, if fuse still blows my guess is the ECU is shorted out. 94

 

just put the new fuel pump in and im still blowing my 15a fuse.....

 

your ecu is fcuked get a new ecu

 

well your fuel pump wont prime if your ecu is not working...simply just swap it out and try on another one...to see if it works...

 

i tried unplugging my o2 sensor and it fired right up wtf

 

try replacing it with a new o2 sensor then

 

One time, a buddy(i use the term loosely) of mine welded an o2 bung into his header. The location waas very bad. Once it was bolted up it smashed the o2 sensor into the subframe. HAHAHAHA...yeah definately fried a couple wires, lol.