jbrx7tt

Asked this of my tuner as well but wanted to see if anyone had any similar issues and how they resolved them....I am signed up for a group tune this month, really looking forward to it. I installed my PFC about a month ago and have been pleased with the performance thus far but obviously looking forward to fine tuning it.

I have had a few idle issues since installing, but have been able to correct most of them by adjusting the idle screw. One time it decided to idle a bit higher, other times I seem to notice an up & down rev issue. It will jump up and down a bit until it is warmed up or it will just happen for no reason at all. I also noticed that at start-up, it does not seem to hold it's idle as well. In fact a few times I would start it and it would stall, but one the second go around it is fine. The normal "warm up cycle" where where it would hold the RPM's, then slowly let off & get to normal idle is now disabled and I am wondering how these issues are overcome.

Is this tune going to help correct some of these issues? Can anyone offer some experience or help in resolving these?

Thanks in advance - Jon

mdpalmer

iTrader: (24)

Bump for you. I'm having the same problems too. My AWS is removed. When my motor is cold, the thing doesn't want to hold an idle (and dies sometiems). After it warms up (say > 50 C) it's fine. Every time I start the car it seems to stumble for a few seconds, until I blip the throttle, and the the idle stabilizes (1000 RPM w/ mild port) the the thing purrs like a kitten! Good vacuum (16-17 inHg) and everything. I need to do more research anyway

jbrx7tt

Yeah on initial warm up it is stumbling but as yours does fine after warmed up. I noticed my idle screw actually came out, I did find it but lost the little spring that goes with it and I think that could be part of the problem. It will be fine for a bit but then will rev up & down or hold a high idle. I can adjust the screw and it goes back to normal but something is not keeping it in place. I guess I need to start by finding a new spring! Let me kow if you come across anything...thanks

DaleClark

iTrader: (55)

The stalling when the engine is cold is from the cold start map. I had to add some fuel correction in on mine to keep it from stalling as the car was warming up. Cold engines don't atomize fuel as well, so all ECU's run the mixure richer when the engine is cold. The PFC's base map is a little on the lean side for the cold start enrichment - give it some more fuel and you should be fine.

If you'd like, tomorrow I'll find out what settings I'm using. BTW, this is easily adjustable with the commander.

Dale

jbrx7tt

Thanks that would be great. I would think this is something the tuner would do as well but would be nice to not deal with it for a few weeks and get to know my settings better.

DaleClark

iTrader: (55)

Here are my settings. This is just like in the commander - the temp range, then the 2 numbers next to it.

80 1.0 1.0
50 1.15 1.09
30 1.37 1.31
10 1.62 1.56
-10 2.04 1.87
-30 2.81 2.57

Mind you, this is my settings for my Florida car. Coldest it's seen is just over 32 deg. F (0 deg C) so the -10 and -30 settings may not work. But, my car starts, idles, drives, everything just fine when cold. I just slowly brought the numbers up over time until the car ran properly. Very un-scientific tuning .

Dale

mdpalmer

iTrader: (24)

Great stuff. Thanks Dale, I'll try to make adjustments to my car. So what you have is under the "water temp correction" menu. So the values in the middle column are for low load and hte ones in the right are for high load right? Also, what (not that it matters I guess) do the numbers correspond to? A percentage increase in fuel across the maps (@ low and high load for the respective columns)? What about the "cold cranking" (I think that's what it's called... don't have my manual right now) menu? Did you make any changes to that? My car is in So. CA so I'll just copy your settings and see how they work

DaleClark

iTrader: (55)

Yeah, the values in the left column are light load, the right column are heavy load. I think it's the adjustment to the base map - not 100% what the numbers themselves are. Again, my numbers are just quickie seat-of-the-pants adjustment - car does fine, so I'm not fussing with it .

I haven't touched the cold cranking menu - actually, I just discovered that menu was there just now by reading the manual . That's only when cranking the car up, and my car starts great every time.

Dale

jbrx7tt

Thanks that is helpful I might fool around with it this weekend, mine will probably be different here in CO @ 5200 ft. I know the other issues are due to the missing idle screw spring which I am hoping to find at Home Depot or something, the Auto store did not have anything. Thanks again