Hey quick question. My fd will start only if I pull the plugs and clear the motor of fuel. It will then start but it runs rough. When I shut it off, it won't start unless I deflud it again. It has a turbo controller, could this be doing something? possible injector problem? thanks.

 

Possible injector problem.

Dave

 

Unhook your fuel line in the engine bay (way easier than pulling the plugs) . Turn the car over, if it fires up and then stalls after a few seconds my guess would be a bad/leaky injector.

 

That's a good idea. Coudnt I just unplug the fuel pump? wheres the relay?

 

That would create a massive puddle of gasoline. Am I missing something, or doesn't this sound like a messy and dangerous way to proceed?

 

not to mention this won't clear out the fuel... you may as well just pull the injection fuse and NOT burn alive.

i'd send the injectors to be serviced. witchcraft or cruzin performance (i'll warn you though, they've had my injectors in hand for 3 weeks now)

if you can't afford to have the car down you could install a fuel cut switch and turn off the engine by cutting the fuel. a more expensive way to go would be to buy a used set of injectors and send them to get serviced while you use the cut switch.

my fc had the same problem, but i believe 10k miles of pre-mix cleaned up the injectors. i still use the cut switch as a precaution though.

 

Ok, so I pulled the fuel pump relay and the car still started and ran. Does this make sence or does it sound like someone has been playing with the wires? when it was running (like crap) I pinched off the fuel hoses and it did seem to run better for a few sec.

 

Okay...that is weird ^
Your FLOODING problem could easily be that someone has bypassed the fuel pump relay.
Keep in mind the car's ECU controls the fuel pump and varies the volume and pressure, the relay is used in this. The fuel pump should NOT be pumping at max pressure/volume with the car at idle.
Something isn't kosher here......

 

I don't see how the FP relay would cause flooding - the ECU is what controls the voltage going thru the injectors. Regardless of the fuel pressure, the injector should be normally off because the ECU isn't closing the circuit.

Basically, the injector mechanism and the injector o-ring are the only ways pressurized fuel gets into the engine. Considering that both of these are common problem areas, I would pull them and send them for a proper cleaning. (You also get o-rings with that if you send them to the right injector shop).

Thomas: what ECU codes are you getting? (assuming it's a stock ECU)

 

That is a good point on the fuel pressure. The regulator is after the injectors, so if to much fuel was being pumped... the pressure would be higher. The injectors would still open at their normal time, but now with the added pressure, more fuel would be entering the engine. correct me if i'm wrong.

There's no light on, but I do have access to a scanner. I'll see what's going on. How advanced is mazda's obdI? will it give me specific read outs for sensors?

 

I'm just pointing out that the ECU controls the fuel pump relay. The relay controls the pump output. So...... how the hell can the car even get the fuel pump to work with the relay OUT???
Ergo, someone has the relay bypassed and thus POSSIBLY the fuel pump is overtaxing an injector that is marginal or leaking.

 

Ah, I see - the ECU controls both the fuel pump relay AND the duty cycling of the injectors.

Dave

 

this has a little somthing to do with this but isint there a number of japanese performance companies that offer sand alones and those half-n-half systems that could cure the flooding problem or am i just mistaken ?