ElMaq

Hi guys

I have a problem and I'm crazy
Civic LX 1.5 D15B7 1993 A/T

Engine starts fine, well done...
After around 5-20 min it dies and Check light stays on. After this stalling, turn key, crank but won't start. CEL stays ON and on and theres no sound of the fuel pump starting.

If you try to start around 3min later, start fine again and dies after 5-15 min. While engine is running nothing anormal occurred. Runs very well.

I made jump wire and CEL show no blinks.

Replaced: fuel pump, main relay, fuel filter, tdc/crk/cyl sensor

Inspected: pressure regulator ok, grounds ok, ignition switch ok

Noticed the tailpipe release a anormal smell (like rust) and many water

Thats all
Regards

Former User

Sounds like the ECU is bad.

ElMaq

Hi.

A guy who repairs ECU told me my ECU have a overheating capacitor. He must complete the repair next tuesday.

Thanks

ElMaq

Hey guys

The ECU came from repair and seems like Civic no stalling anymore. But still won't start sometimes. CEL stays on after 2 seconds and no blinks any code. :-(

ElMaq

I noticed a curious detail: the longer the time between the engine starts, the greater the possibility of CEL to stay on. And when you do not hear the sound of the fuel pump, it means that CEL will not go out.

mk378

The CEL staying on and pump not priming means either main relay is bad or the ECU. Even though it is new, it wouldn't hurt to resolder your main relay. Or resolder the old one and put it back in the car. If the problem continues, consult with your ECU guy again or buy another one.

ElMaq

I changed the new relay/old relay but the problem continues and intermittent. The old relay is good.

mk378

If the fuel pump were bad the light and relay would cycle normally (though no fuel would flow). So it's not that.

ElMaq

Fuel pump is good. But I installed a new one. The problem continues the same.

ElMaq

Replaced tdc/crank/cyl sensors

ElMaq

Ign Coil: good. I replace for other known-good and the problem continues.

Ign sensor: not tested

mk378

I think there is still a problem in the ECU. Not as bad as before, but still there. You've spent enough on other unnecessary parts to buy a used ECU and replace the whole unit. ECU's seldom go bad, but when they do it is often exactly what you describe with the intermittent slow or no "boot up".

ElMaq

TomCat39

^^ I believe it's this.

Changing a bad capacitor on a bad ECU isn't necessarily going to make it a good ECU.

I suspect the ECU is still bad.

ElMaq

Hi guys, I think I can reply you since I've been testin a known-good ECU. Now, Civic starts ok all attempts and won't stall anymore.

I apreciate your help. Thanks a lot