Help with codes

[SDstroker]

First off I am fighting a rough idle/ slight miss.
Ran a buzz test, 2 injector sounds a little weaker(#2&#4) then the rest and got a P1668. Immediately cleared and ran test again, all injectors sounded the same and passed.
Next I ran a CCT and got a p0272 for cylinder #4.
Also had a P1670 stored.
Any ideas on where to start? I ohm'd the injectors and they all come out to around 3.6.

 

[SDstroker]

I read some stuff and I am going to double check the UVCH connections. IDM either works or it doesnt right?
I just thought it was weird that 2 injectors sounded weak on the buzz test and the next test they all sounded the same.

 

[ToMang07]

I read some stuff and I am going to double check the UVCH connections. IDM either works or it doesnt right?
I just thought it was weird that 2 injectors sounded weak on the buzz test and the next test they all sounded the same.

I would say a UVCH is a good place to start. Be sure to check for burnt pins, and insert a trimmed quarter if it's good!

 

[DocBar]

I would say a UVCH is a good place to start. Be sure to check for burnt pins, and insert a trimmed quarter if it's good!

Is the trimmed quarter needed on an '01?

 

[ToMang07]

Is the trimmed quarter needed on an '01?

Yes Basically the stock connection fatigues, and then it becomes lose or falls out. The Quarter is the correct size (trimmed so the valve cover can seal) to hold the clip in place so it won't come apart again. :thumbup:

http://outlawpsd.com/forum/7-3-memb...-it!-(under-valve-cover-harness)/msg81/#msg81

 

[SDstroker]

I haven't had much time but I crawled up and the outside connectors seemed fine. Hopefully this weekend I can get the valve covers off and check inside connections.
For what ever reason I unplugged the ICP sensor and the truck idled smoother and was a lot quieter. No oil in the sensor connector. Plugged it in and went back to a choppy loud idle. Sensor bad?