running really rough

[Harley10]

Need some help with what to do. The truck has been running rough for a few days at idle and not much power going down the road. The temps were around 0 degrees so I though it was fuel issues. I treated the fuel yesterday morning and drove for about an hour and it never got better and finanly lost some more cylinders so it barely runs now. I'm guessing it's an injector most likely but how do I tell which one. Do I order up an AE? Will that pinpoint my issue or is the bad injector keeping others from firing? I just spent a but load 2 months ago doing my headgaskets and studs so funds are tight. I understand it could be bent pushrods as well but I don't see unburnt fuel coming out the tail pipe. All injectors seem to be buzzing as well if that has anything to do wih it.

Thanks for any help.

[Harley10]

I guess I'll order the AE tomorrow and go from there.

[getgrimey]

You can take a temp gun and check the exhaust manifolds right at the heads and see which cylinders have low temps. You have to do it when the engine is cold to get the best results. A few degrees between cylinders is normal but anything over 40 degrees usually means a bad injector. Good luck. Mine was doing the same thing a few weeks ago and I had to replace 5 injectors.

[Harley10]

thermometer makes sense. I'll pick one up tomorrow and see how it works. Why can't I think of simple things like this?

[getgrimey]

If you have multiple injectors out it find the hottest cylinder and gauge it off of that one.

[Harley10]

Well I just got done replacing #1 injector and now I don't have any fuel in the bowl. I had it running last night with the bad injector with the AE hooked up and now after I "fix" it I have no fuel. The AE can't turn off the fuel pump can it? Is there a relay for the pump or just a fuse? Getting really frustrated now after fighting the injector install.

[Harley10]

Never mind, I have fuel now but I cracked the filter cap in the process. At least the injector works.