I just finished my head and cam install and tuned the car this last Monday. The tuning went well after we installed some 28# injectors. The car ran great all of Monday and Tuesday. Late Wednesday, almost as if a switch was turned on, the car began misfiring and dumping lots of extra fuel through cylinder 1.

So far I've swapped the plugs and wires from cylinder 3 to cylinder 1, with no change in results. I've also swapped injector 1 for injector 2, no change in results either.

From what I can tell on AutoTap is that the bank 1 and bank 2 injector pulse widths are different by a half to full millisecond when the misfires occur. The exhaust smells really rich. When I drive it there is a significant loss of power, but not as much as if you were to leave a plug wire off. The car does get better and doesn't register any misfires, but it always is a bit rich. In some of the gears (like 4th) it sometimes doesn't have the pickup that I'm used to.

Anyway, if anyone has had something similar happen let me know.

 

TTT

Has anyone had similar issues? I can better explain the symptoms a little better.

Basically at idle it's smooth for a little bit. As I get moving the car bogs down, as if someone was holding it down. When I give it fuel it just bogs down quite a bit and then it will start to burn it off and go. I think I hear a ticking at certain rpms that is not that same clicking as the valve springs.

Right now I have the injectors out for cleaning and balancing. I'm hoping that they are the culprits. I can put my 24# injectors back in and try it out again. I'm also wondering if it's a coil going dead?

Anyway, I can't really explain it any better. If anyone has had any similar experiences let me know where else I can look!