Cold Start issues - very rough idle:

[Ryans71]

The last few months when starting it feels like one cylinder is missing. I give it a small amount of throttle and it still feels like a miss. It has very little power when I put it in drive and try to move. Once it warms up a little the miss goes away and it's back to normal.

Even during the summer I've heard a small "clicking" sound when it's cold and I'm applying throttle. The more throttle the louder the "clicking". Once it's warmed up the sound pretty much goes away, but can still hear it faintly if giving it a good amount of throttle.

It's an '01, 7.3 auto, stock except for 4" exh & ford AIS intake with 160K miles.

Opinions?

Thanks.

[Justin@DP-Tuner]

Could be an injectors starting to go. Does it sound like it is coming from the drivers side?

[Ryans71]

Yes, it sounds like it's coming from the drivers side.

[Justin@DP-Tuner]

The #8 injector is known for having problems. It is the closest to the firewall on the drivers side. It is always starved for fuel because #6 fires right before it.

Do you have a way to do a cylinder contribution test?

[Ryans71]

Originally Posted by Justin@DP-Tuner

Do you have a way to do a cylinder contribution test?

I don't.....

[Justin@DP-Tuner]

Originally Posted by Ryans71

I don't.....

Okay, try to find a way to do that. It is not always the most accurate test because the CPS can sway the readings, but it may help you out.

Also, if you can, do a buzz test first thing in the morning when the truck is cold. Listen to all of the injectors. They should all sounds about the same.