Any body else have this? I can't seem to shake it. Tried adjusting running airflow down and all that did was make it die going from drive to reverse. Any tips or suggestion. I have a small Crane Cam 113 LSA, stock tb hole and the other usual mods. Intake, headers etc. I have edit and have gutted the cats and removed egr and have larger 2004 injectors and scaled accordingly. I did not need to modify any VE tables. The truck runs excellent except for when I lift of throttle at 30 mph I can cruise down the street withour having to give it the gas. I still have the stock tourqe converter and am planning to upgrade to a TCI 3000 in the future. Is the stock converter to tight? I had to increase the idle to 625 in gear for drivability purposes. Maybe with the higher in gear idle the stock converter is to tight. Any thoughts or opinions, ideas, instruction?

 

ttt..

 

My truck did the same thing when I had the stock TC, and idle raised to 700rpm. What you need to do is lower the idle speed, and adjust the TB screw to stop the stalling.


TB screw adjustment in this thread
https://ls1tech.com/forums/showthrea...=stop+drilling

I had the tb drilled out on my 5.3L, it ran okay, except the rpm would drop to low when returning to idle. I had a custom tune made for my predator, with raised idle, and it did the cruise thing, and it would stall sometimes. So after 4 tunes, I went back to the default tune. When I swaped in the 6.0L, I did the TB screw adjustment, to stop it from stalling when shifting, and when coming to a stop. I runs like stock now.

 

Cool thanks for the help. I will try it tommorow.

 

Jody, post up the results on your tests. I'll watch this thread and see if I can give you some tuning help if that doesn't fix it.

 

I've got it too since the cam swap.

I've heard that it's an indication of too much fuel.

I always get it after I flash the computer - my truck seems to need about two days of driving before it settles into a good idle, with a good cruise mode. It's picky until then. When I get the cruise control effect, I also get a real poor/low idle.

When was the last time you made an edit? How much driving have you done since then?

If your CCE is also messing up your idle, you can try an "idle relearn". I'm not sure if it's all snake oil or what, but you pull a couple of fuses, put them back in, start the truck, and let it idle for a while. It's more detailed than that, and it can be found in the tuning section of the site.

I did the relearn procedure after one particular flash, and I never got an idle or cruise control problems with that whole tune.

Short of doing the whole relearn, you can just let the truck idle for a while all on it's own. Throw it in P/N. Let it idle for five minutes. Row through the gears with your foot on the brake. Hit the AC button. Turn it off. Repeat until the idle is stable, and the cruise control effect should be drastically reduced, if not gone completely.

Either way, with my case, it will sort itself out in due time.

 

FWIW, I'm also 625 in gear. 675 out.

The cruise control effect that I talk about lets me do 45-50, maybe more, without touching the gas. I've always kind of idled along at 30mph or so.

 

Cruise is caused by too much air. Say you over-ported your throttle body, have an intake gasket leak, etc...

Marc - did you make any changes to your idle and running airflow tables in Edit?

 

Richard - that's what I thought too - RE: CCE = too much air. I wasn't sure if things were working backwards and with the motor getting too much fuel, the IAC motor was adding air? Just one of my many odd theorys.

In HP Tuners here, there are no tables labeled anything like Running Airflow, so I'm not certain...

I've basically just messed with the "idle speed", "idle airflow", and "main VE" table. Right now, I'm back to all stock except for idle speeds.

When I had made changes to those tables, I wasn't resetting the fuel trims, and I wasn't accounting for the learn time involved with them... so my results were probably skewed.

With my VE table stock, the throttle "hangs up" less, and comes down to idle quicker. I was having idle problems with this before, but now that I have the idle-quality stuff somewhat sorted with this learn-time thing that seems to work for me, I'm giving it another shot.

 

I tried a few things today. 1st I did as above cracked the blade reset the tps and it would stall everytime going back to idle. I mean bad. Tried several different things after idle relearn. No dice. So I said screw it and put in all 2002 tables. Fuel air etc except for shift points and codes and a few other items. Reduced idle in gear to 575 rpm. To tell you the truth it runs harder, lays one hell of a second with 33 inch 12.5 wide tires. Most important no more CCE. I have researched and researched this to no end. The 99 tune straight up sucks. With my idle at 625 in gear and stock tight converter I would cruise control. Now I can set my idle at 575 with no drivability issues at all. It will idle at 575 in gear with a/c cutting on and off with no surging at all. I am happy with this performance. Thanks for the help guys but tuning a 99 is a different animal for some reason. Of course every vehicle is different but this is what worked for me. Thanks again guys.