I have a 85 GT 4spd. It runs pretty rough from idle up to about 2000 rpm then smooths out. I changed the spark plugs and wires and it didnt help. What I did notive when I changed the plugs is that 3 of them were wet with fuel and 3 were a nice brown color. My thoughts are that the injectors for the 3 wet cylinders are dumping way to much fuel at lower rpm. Sticking open or something. I was wondering what you guys thought before I went ahead and tore it apart.
3 fuel injectors going bad at once? Were they all on the same side (1,3,5 or 2,4,6)? I'd finish the ignition trouble shooting before tearing into the upper intake. Ohm the coil and the dist pickup coil, check the ignition module wiring and grounds. Also check the TPS for proper voltage sweep.
By three being "wet" do you mean an entire side was wet and the other wasn't? If that's the case, the injectors actually work off of two fuses. One fuse controls one side of the engine while the other controls the other side. I believe the thinking behind doing this was that if one side were to fail you would still be getting some sort of power and not be completely stranded. If all six were tied to one injector and it popped you could potentially strand yourself. I don't think it necessarily matters which injector plug is plugged in where it just matters that they're on either the "front" or "rear" engine side.
Thanks for you input guys. The wet plugs came out of cylinders 2,4,5. I haven't driven the car since '08. The coil ohms out ok, but that doesn't necessarily mean anything. I'll continue going thru the ignition system before I take the intake off.
