BarnesCole

thanks for posting, definitely good reading.

over the weekend, i went into the tune with HPT and set the camshaft controlled by ECM to 0 or none. This basically disables the vvt. I ran it for an hour and half trip down to VA and it drove flawlessly. No missing, no hesitation. In my mind that was enough for me to confirm the camshaft magnetic actuator was not operating correctly, and was likely stuck open. The oil pressure also rose 5-10 on the gauge with it disabled.

So looks like final gremlin has been taken care of!

RWC

iTrader: (5)

Maybe not, the phaser is hydraulic operated & rarely go bad, sensors just tell the ECM where the cam is at. Another check I would reccomend is for you to reset the phaser RPM tables using the the factory settings that are in each of the high load areas & making them the same all across the table for each of the RPM axis, which takes out the high retard areas. Then you will have a straight cam advance curve so you can then log the phaser action to see if it is working like it should. It will run better than leaving it parked at "0". The high retard areas are mainly for emission purposes & "maybe" better crusing MPG. Those may be causing your problems. A properly set up VVT is a much better setup, especially in a truck, making more torque & HP across the board, The exception may be only for the largest of cams with P to V clearances which usually aren't suited for a truck anyway. There are some now specing very good VVT cams, with tuning, that could be well suited for you. Most have not understood tuning for VVT but now it is starting to become the smart setup for those that have learned to tune for it.

BarnesCole

i'll give it a shot and report back. thanks so much for the guidance!

Avalade

Any updates? Did you do the VVT delete and swap cams?

74silver911

I'd also like to see if there are any updates? Specifically regarding the tuning and the VVT. Were you able to get the VVT to work for you? I'm just starting this same swap on my 2007.

gagliano7

When I put a 5.3 in my 1992 chevy truck I had the same problem. Full throttle no problem but light throttle was rough and a little rough at idle. I took an infrared temp gun and found #8 primary was a much lower temp than the rest. Found out I had a bad coil. Changed that and has run great ever since.