I have a 90 CRX SI that gets no fuel no spark... the main relay buzzes when its on key on engine off and the CEL is dim and the light on the ecu stays on...tried diffrent main relays and another ecu (from running car) and nothing...cranks but no fuel prime or spark

 

Nobody?

 

CHECK YOUR GROUNDS

 

Will do this morning

 

Just to clarify...

Cranking and turning over are the same thing (the engine crankshaft is spinning).

 

That main relay buzzing hints to wiring problem.
2X for the grounds.

 

Grounds are good.......im stuck!!!

 

I have a 90 civic si nd I tried tht ecu nd still same thing

 

Check Fuse #14 (Alternator Solenoid I believe is the name on the panel) under the dash as it powers ECU, Main relay etc.

 

Its good, even tried a diff. one...no luck
Could it be the ignition switch?

 

Need help!

 

IS your battery good? Low power makes relays buzzzzz.

other than that, everything I'm finding points to they thermostat grounds or your battery to chassis ground.
Skimming the internet and some have just needed to remove the grounds and hit them with some sandpaper to clean them up.

Anyway - thinking if that doesn't work then maybe directly hook a ground to your main relay just to rule out the possibility of a ground issue.

#2

 

when you turn the key to the on position the red light on your ecu will come on for a few seconds then turn off. if the light doesnt turn off then your ecu is fried. pic you up from a scarp yard and give it a try. thats what happened to me and it ended up working fine. keep us posted

 

I just checked #2 like 5min ago nd it read 8v, oma see where it leads to...nd I cleaned all the grounds with sandpaper already...ill see wassup...thanks for the info though

 

Thermostat ground wasnt hooked up from previous owner -___- cel is normal nd I get a code 15 cuz I guess it has an ls dizzy...ima switch it from my ef hatch...but I still dont get spark or fuel...;(

 

Could be the distributor, or specifically, crank sensor located inside it. When the PCM doesn't see signal from the crank sensor, it won't allow the main relay to run. No spark, no fuel. It should still prime though. Does it prime?

 

It fired up...i dont hear the fuel pump prime but it still turns on after i put my ef si hatch dizzy.
Thanks everyone for the help appreciate it.

 

I've got the same problem. I got my 91 CRX hf from my uncle as a car to learn on. I've got no spark, nothing makes any noise, and I'm just learning about engines. I learned body but thats about it. Where is this relay at? The people that had the car before us took a lot off the car so I have no clue as to whats wrong with it. no spark, no fuel.

 

The main relay is up under the dash behind your coin holder.

http://techauto.awardspace.com/mainrelay.html

Check that website, it has all of your troubleshooting steps for a main relay issue.