Hello all,
I have a 1988 F-150 4.9l I6. I have a leak in my number 2 injector. I rebuilt the injector it still leaked. Took it apart again and I put an endoscope in the injector chamber, seen there was some carbon build up around the injector port. Cleaned all injector ports and injectors, put all new o`rings and caps. Put it all back together started it up and it instantly started leaking. Shut it off, said some words I can't repeat and took a break from it. Came back changed my ERG valve and started it. No leak but I have a misfire now. Ran with no leak for a week and now it is leaking again. It is coming through the bottom (intake) not the top (fuel rail). Any suggestion on what's going on?
Thanks

 

Hi James,
What if you switched injectors with any other cyl?
If you had the leak in the same place , do you think you might want to keep going after that injector?
There could be another problem and you could be chasing your tail.
What do you think?

 

Hanky,
I haven't swapped it with another injector, That should be my next move or buy a new injector. I'll give it a try. I thought it was odd it took a week to start leaking again.
Thanks for the rapid respond.

 

The injectors are ground side switched, have you confirmed there is no short to ground on the signal wire. ?

 

I believe aquanaut brought up a good point, If you continue with the same condition after switching the injector , that would be a good path to check.

 

Aquanaut I will give it a try. Thank you for the info.

 

Quickest way is to use a NOID lite in the injector plug.

 

Good idea, If you can, wire the noid light in parallel with the injector wires and you can run the engine as long as you like and actually see what the injector is doing power and ground wise and the engine operation will not be affected. Might be a little fast, but if something changes while operating you might be able to see it.