ok so my buddy has a 94 civic 4 door ex (z6) he bought this car cheap someone had swapped the motor but didnt finish it so thats where i come in .. ok got everthing done and car ran good no CEL nothing .. ok so heres where the problem is about 1 out of 5 times it will not start ... when it dont i didnt hear the fuel pump... i changed that still the same thing ... ok then i checked for fire and when it dont start its does still fire ... then i realized i didnt hear the injectors workin or spayin.. so i changed the main relay... and again samething ... so i thought the only thing left is the ignition switch... so i thought.. changed that today and still the same thing .... any ideals ???

 

Check the fuel pump and its power and ground wires.

 

the pump is new ... and tracked down all the wires... do u think the ecu could cause this ?

 

A bad ECU is possible. Or even a bad wire between the ECU and main relay.

When the fuel pump won't prime and the engine won't start, does the CEL remain on steady with the key in ON(II)? If so, have you tried to pull the CEL code?

 

no.. no codes at all .. you can keep turnning the key on and off and after a few mins the pump will come on and it will start .. but like i said it does still fire .. so i ran a hotwire to the pump .. and still wouldnt start ( the injectors wasnt spaying )

 

Does the CEL work?

 

yes it does work

 

Check whether dash fuse 24 (ACG) is loose.

Check the wire running between the main relay and ECU A23/A24.

Swap in a known good ECU.

 

main relay under the dash

 

ok new dizzy,ignition switch,main relay,fuel pump .... anyone ??

 

It's get quite expensive replacing parts at random. A good multimeter only costs $10-$25. A lot less than what you have spent already.

 

Since u don't hear the fuel pump prime it either one of two things: the fuel pump or MAIN RELAY... since fuel pumps never go bad on Honda's... IT THE MAIN RELAY!!!

 

You guys need to read post #1 and #10.

 

yeah i changed it .. and 5th gens dont have a fuel pump relay only main ralay

 

yes i know but he works at autozone so we get to try out all kinds of parts