So I took my engine apart down th the intake manifold. Just to do gaskets and fix some leaks, replace some parts and so on. So I get thing together and she ran better then when I took her apart (which I thought) but then I had an issue with fuel actually coming out of the throttle body. So obviously ther was an issue. I figured the ford injectors southbay sent me wer wrong so I took em out and put the stock ones back in. Put it back together started up (after clearing the cylinders out first, obv) and she started up and no fuel out of the tb now. BUT now she's spurting fuel under the upper plenum. I thought it was the injectors but I looked at it and saw it's the line going into the fuel rail. Now I didn't think the 89 had a cold start but I guess it does cus that's what my dealer manual says. So I order a new fitting set since I can't just order the o ring I need. But my question is since it is the cold start should it be running all the time? Cus even when the engine was on and running it was still leaking lots of fuel out it. Or is that how it works? I know nothing about cold starts. I feel like once i fix the leak it's just gonna back up again because the cold start isn't suppose to be constantly pumping fuel so that's why it was flooding.

 

cold start injector only fire on cold start situations. thats it should not leak. replace the injector and change the plugs and start over. 2.8 is the only one that had the cold start injector. 3.1's don't so (86-89) i think.

 

Ok sorry let me make myself clear. It's not the injector that's leaking it's the valve. The part that goes into the fuel and leads to the injector behind the motor. It's leaking between the nut and the piping that goes through it. But I kinda got my question answered at work. I work at a dealership in a body shop. My friend who's a tech explain the cold start is run by the sensors. The only reason it was still leaking fuel while the car was running was because the temp of the coolant was still way below operating temperature. As soon as it warms up he said the cold start should shut off.

And btw would the wrong injectors cause the backup of all that fuel?

 

Umm... That tech would be wrong. The cold start injector is completely independant of the ECM. It's powered on the CRANK fuse, which is only active upon cranking (only other thing on this circuit is the starter solenoid coil). The "sensor" in the intake manifold next to the ECM CTS is a temperature controlled switch that holds the CSI open until the coolant temp reaches 100*F. The only valve in the CSI system is the injector itself, which is closed at 100*F coolant temp. It's supplied fuel full time.

Chances are that either the o-ring in the fuel rail fitting is either torn or missing, and it's going to spew fuel out of there like there is no CSI line attached if this is the case. You can either stick 4 o-rings in there, 2 fitting the CSI tube and 2 the next size up, or you can spend $10 on a gasket kit that all you need out of is the one 10 cent o-ring.

 

Yeah the fitting that screws into the fuel rail I took off and took off the nut from the other nut and ther wasn't even an o ring in there.

So your saying if the o ring isn't in there it'll spit fuel out constantly like it wasn't even a cold start? So once I put the new o ring in that should solve the issues? Cus I bought a new valve unit cus dealer didn't have the o ring separator but I could use a new nut anyways. It was pretty marred up

 

There's 2 o-rings on that fitting, one between the fitting and the rail and the other between the fitting and the tube from the injector. Missing either creates a stinky fire hazard mess of a fuel leak. Replacing the fitting and the o-rings will solve that issue. Don't know as I would go so far to say you needed the whole shebang, but it should solve your problem provided it comes with the required o-rings.

 

Well I didn't take the injector part behind the motor out so that part is good. Just the valve that goes to the fuel rail. And yeah tell me bout fire happy fuel spitting out from underneath the plenum lol and yeah I tried diff o rings and none of them kept working so I bought the whole little valve. Not the injector part just the nut and o ring. Was only 30$ so no big deal. And like I said the nut was pretty marred so it wouldn't hurt.

 

Hopefully it works out for you and is worth what you spent at the dealer . I just hope that the o-ring that came with the tube isn't for the injector end but the rail end.