5.3 Swap, white smoke after tune

I just got done swaping a 00 5.3 into a Jeep. I did the harness myself taking out everything that wasn't needed. (Trans stuff, etc.) I then had a buddy of mine tune it with HP Tuners to get rid of the anti theft as well as all of the trans stuff. Nothing with the engine was toughed in HP Tuners, we didn't touch VE or Spark tables. We ran it and everything looked good in HP.

It turns out it was only running on 7 cylinders though. It wasn't ran for long and never driven like that, just ran a few times while troubleshooting. Raw gas was actually pouring out of the cylinder when I pulled the plug out. I tested for spark with the crapy plug I pulled out and got a real weak spark. Then I bought a new set of Delco Iridium plugs, good spark. Seems to run better and there hasn't been any raw fuel in the cylinder yet. That cylinder also feel as equally as warm as the others when it was noticeably cooler before.

The thing still smokes pretty bad, white smoke and smells super rich. should I look at next? Maybe its still in open loop since I've never ran it long enough to get it up to temp.

black smoke = too much fuel
blue smoke = burning oil from bad rings or valve seals
white smoke = burning coolant

might have blown head gasket
might need to take heads off and take a look, but thats a $100
job just for new head bolts and gaskets just to "see"

If you are burning coolant that can mess up the combustion process
and not let all fuel get burnt causing "rich smell"

you can force it into closed loop using HPT. In the scanner, go to Displays, VCM Controls, Fuel and Spark and there is the control to force it into closed loop.

check oil, see if it's milky.

watch coolant level.


cheaper/easier then pulling heads apart.

Excess fuel in the amount like a stuck open injector can look white. How long has it run? Does it have cats? Unburned fuel can "stack up" in the exhaust and take a while to dissipate.

sounds like when i washed my cylinders,from excessive fuel in the cylinder and no spark ,glazes the cylinder wall,and dumpes fuel in the oil.all i did was change my oil 3 times in a row to get lucky enough to be ok.mine smoked like a hooooes dream at first though

Thanks for the reply's. I will do what some of you say. Its only been ran probably a total of 10 mins. I am also thinking that after the new plugs it is running better but also has some fuel in the exhaust still

No cats by the way.