my 94 sc300 started missing the other day so i changed the plugs and wires.didnt fix it. so i started looking into it a bit and found the number two injector was not firing. no big deal i change the injectors. all six with new ones. still not fixed. still has the injector not firing. so i got to reading and found the ecu caps could be bad. sent ecu off to get fixed waited forever. but got it back. plugged it in and still not fixed.ive changed everything i can think of. so what else could it be. timing is dead on i have voltage to the plugs and injector. injectors all fire. what could it be.please help. any ideas would be great. thanks.

 

Did you check the coils?

 

no coils. 2jzge.

 

Ooh, didn't realize the SC300 is coil-less. That's all I've got, sorry.

 

Kinda confused. You said number two injector wasn't firing, changed stuff, still isn't firing, then all injectors firing. What's the cap and rotor look like?

 

did you pull the plugs?
what did the plugs look like?
have you checked your maf?
tps?

 

I would check the injector clips, and as said above cap and rotor and there is one coil on the 2jzge.

 

i checked the plugs. they are all good. replaced the plugs wires and cap rotor button. all new. no burns or spark jump. the injector number two was not firing put in new injectors all 6. not sure if they r opening or not but i did check the injector plugs. they all have voltage. tps and maf are good. car runs just missing some. ive heard that if a valve sticks it could cause the same problem. which makes sense to me. has fuel has spark just no combustion in one cylinder because its open or partly open. everything is new injectors rotor cap plugs wires. only thing i can think is to do a compression check. unless anyone here has some other info. anything would help. im sure its just something im not seeing and will feel dumb when i find it. thanks for you help guys.

 

And I clicked on the thread thinking you misplaced your SC.

 

nope didnt misplace my sc. its still sitting in the driveway not running right.

 

when was the last time you changed your fuel filter?
its a long shot, but it might be clogged and allow inadequate gas flow.

 

fuel filter is about three months old. should be good.

 

how about your O2 sensors? well the upstream one.
on my prelude when the upstream O2 sensor was bad, it would misfire randomly

 

Check for continuity from the ecu to #2 injector.

 

Unless I missed something, what about the fuel pump control ECU? Try the 12v mod...