The oil pressure is supposed to drop as the car shuts off. Think about it, when you shut your car off, does the oil pressure stay the same as it does when its idleing?

 

Can't believe I just found this thread! I've been having this AC problem since my first round of mods. It's been anywhere from 100-120 degrees out where I live and I've been driving with no AC in this heat because of the stalling issue. Time to call my tuner and finally fix this.

 

I have tried any and all of these suggestions with no luck.

Car has new battery, spark plugs.

Boost leak tested (new TB seals).

Short of setting s 3k idle I can not get it to NOT stall.

SD converted same deal. stalls only with AC on. At this point I'd PAY for someone to tell me how to fix it....


I have not tried: closed loop for low load, and um ..

 

I've tried mine in full closed loop to no avail. I haven't had my car in a while though; I'd like to hear if anyone can resolve this issue, as I tried everything on the list as well. I wonder if it has anything to do with the injector latency...

 

Idle adjustment screw on the throttle body, counter clockwise raises Idle

 

I actually have been working on this, but I have Autronic. Idle ignition timing has a great deal to do with the A/C and stalling, try raising the Idle ignition timing at 1500 and 2000 RPM, that is if you can. Currently when I turn MAX A/C on I get about a 50rpm drop. GL

 

You'll have to forgive me for not reading every page of this so perhaps my suggestion has already been mentioned. I'm also very much a beginner when it comes to tuning and Ecuflash so I could be wrong on this but I know in Ecuflash there is a setting under the Idle category for "Desired Idle RPM with AC on." I have not tried playing with it yet to see if it works but I wonder if you could fix this problem by bumping those numbers up a little. Perhaps one of the more experienced tuners on here could chime in and let us know if this indeed would fix the problem or if there is a good reason to leave the settings where they are at. Right now my neutral idle is set at 1133 when the engine is warm but for some reason the Desired Idle RPM with AC on is set at 852 in neutral and 648 in drive. That seems like quite a large drop to me but like I said I'm new at this so I could be wrong but I also have the same problem where my car almost stalls but not quite with the A/C on.

 

I have tried everything from stock values up to 20* in the A/C idle cells. (also have tried a couple * lower than stock..)

 

ALOT of fluctuations when im sitting in traffic with it on, so most of the time i shut it off. But I never wondered why just deal with it. But i can say it(mine) never really came close to stalling on me. Good luck

 

Mine is stock and it doesnt stall. However one can feel that it sucks a lot o power out

 

I'm assuming everyone with larger injectors are having this issue correct? Has anyone looked at retuning thier injector battery voltage latencies?

 

I have stock injectors and mild bolt ons. My car doesn't stall but it some times feels like it's going to when I'm pulling up to a stop when the A/C is on.

 

I'd agree with what you say except the part about never turning the A/C on when driving. If you open the hood and watch, you will find the compressor is continually engaging and disengaging automatically. So switching it on during driving is just one more engagement of the compressor clutch. What happened to you is just a freak occurrence.

 

fuels trims are +/- 2% lat are spot on. FIC 1050 using very close to latency that MRfred took great time and care to dial in..


Also this only started for me AFTER installing the QM Twin. I am guessing the huge change in rotational mass the ECU wasnt designed to recover from or compensate for.

 

i hate my A/C!! i turned it on once when i was stuck in traffic and the car just felt like it was goin to stall. after that i never tunred my A/C on. i just roll down my windows. people say that turning ur A/C on helps the car last longer or something. would there be any problems if you never use ur A/C?