Meaning you could have more fuel that could be burnt at idle. A buzz test only test the electrical parts you need to have a CCT (cylinder contribution test) done to see if the injectors are dumping the right amount of fuel

 

You have two plugs going to each valve cover. Unplug on plug at a time and start the truck and see if if stops smoking.

 

I would try the white smoke sticky thread at the top of this forum and go through it. Might be a lot easier...

 

I will try this tomorrow. Do you know if the harbor freight scanner will check this?

 

This being the cylinder contribution test. Sorry.

 

Rick, does a person need a special scanner to check the IPR DC % or could someone take it to an Oreilly's and use there scanner for free?

 

You'll need something lime a AE,'snap on, OTC, or a scangauge

 

Whats the DC% mean?

 

The part store scanners won't read a psd. A good shop will have one that can see live data

 

Thanks Mike.

 

It's the IPR duty cycle which is the percentage that it is closed. For exp. if you have 15%DC then the IPR is 15% closed

 

Thanks

 

What % range should it be?

 

Depends on your throttle position, mine will vary from 13% at idle to 45% WOT.

 

X2^^^^^^^^^