Need help with HPTuners, I am green when it comes to using it, have tryed their website for help but no response. Except to try here on this board, so here it goes. My 2002 Sierra w5.3 has a problem after I installed the cam in it, on cold start up it has a real bad lope to it, and sometimes trips the SES light on. The lope acts like on old carbureted engines when the butterfly for the choke is set too rich. It chugs along till it starts to warm up. Tryed to make some adjustments using HPTuners program, but it made things worse.

My question is this. What area of the program would I go into to try and correct this, and which way would the adjustment need to go? Or if there is anyone in my area, I live near Indy, that could give me some tips on how to use this program I would apreciate it. The cam is a Comp 212/218 522/529 114LSA. Have shortie headers, TB spacer, drop in K&N filter. Thanks for any help.

 

Tuning the cold startup tuning stuff is pretty hard...

The SES light is easy... In the HPT Editor.... Click: Edit -- Engine Diagnostics -- Missfire. You should see the label: "Misfire Max Time Between Events By Cylinder vs. VE%". Under that will be the table you need - "Idle (Stopped)"

Bring the table up - you should see a bunch of values that are NOT 32767... Mine all happen to be colored green. Highlight these non-32767 cells, and multiply them by two.

That should desensitize the missfire detection enough to kill that light. (You may have to run the scanner and shut off that light)

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Now the cold start thing... I had a whole thing typed out here, but I realized you have an '02 with the manual throttle body on it. I don't thing what I did will apply to you. In your case, I think you'll have to drill the TB blade slightly in order to let just a little more air in at idle. I was going to suggest bumping the idle speed a bit, but I'm not sure if thats manually set (with the screw?) on your TB.

The other fix would be to edit the fueling tables, which is way over my head...