Ok well my car has been sitting for about 3 months now due to me needing to replace my DP.
During the down time I've done the following:
1. Replace my heater hoses back by the firewall
2. Switched from a 16g to a 20g
3. Had a stock 3g muffler welded on my 3" exhuast
4. Updated my MS firmware
Now...what happens is I start the car and it will idle fine and if I go to drive it, it will stall out within a minute or 2. If I just let it sit and idle long enough...it will stall out as well.
I datalogged the symptom at idle and there is a point right before it stalls were my map signal and my rpms cross and my rpms go way up and my map signal shoots way down. I will post a screen shot of it tonight. Almost looks like the map does a reflection effect of the RPM if that makes any sense.
Why is it stalling out all the sudden? I didn't do anything out of the ordinary for this to happen. Could my IAT sensor be failing?
Also after the car stalls out, I can't restart the car for at least 5 mins after it stalls. And this is true for everytime it stalls.
#2835, "RE: Car Stalling Out" In response to Reply # 0
I would reload the previous firmware to see if the issue continues. The amount of fuel being injected also affects your map value. I am not quite sure whats going on but since you just loaded a newer firmware, i would revert back to the original you had and try that.
#2843, "RE: Car Stalling Out" In response to Reply # 1
Well I didn't go back to my normal firmware as of yet. I did pull out my IAC sensor and the little probe in it was gone. I replaced it and now my car runs ULTRA LEAN! I mean 19.9. Since day one it hasn't held a tune...it just keeps falling out of tune really fast and doesn't seem to work very well.
I have been having nothing but issues with it since I purchased it. I am thinking about going with a portfueler here very soon if this keeps up.
#2844, "RE: Car Stalling Out" In response to Reply # 2
What firmware did you upgrade to? When an engine is starting to chug or die out, you will notice that the map will get higher(engine pulls very little vac when its running bad)closer to 100 kpa, so that sounds somewhat normal..I would go through ALL of you settings in Megatune to be sure nothing got skewed when you did the firmware change. Sometimes a few settings can get off when upgrading. Especially check the closed loop perameters, as you your o2 settings may have changed, and the ECU is trying to run super lean. Verify you have all the settings the way they should be, then go from there.
13.5 @108 MPH-2.2 60ft(stupid FWD!) S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential fuel injection) My webpage: http://eclipsed4evr.home.comcast.net -1998 Mitsubishi Eclipse RS-T- "Toy" -1992 Plymouth Laser Turbo AWD(SOLD) -2000 Honda CR-V(daily)
#2865, "RE: Car Stalling Out" In response to Reply # 5
Originally posted by BlackMagic What I did before changing over to the 029t firmware was take screenshots of all of my settings so I could make sure nothing changed.
That's a damn good idea
----------- the first solution that comes to mind for any new problem with my car usually involves a can of bad gas and a match...
#2868, "RE: Car Stalling Out" In response to Reply # 8
yes it is...I should of done it, but never expected it to switch setting like that. Guess I learned my leason.
Car is still stalling out and no idea why. It seems that its temperature related, but I'm not 100% sure why. Reason I want to think that is cause the car will start up and and idle fine now that we adjusted the VE Fuel table so its not super lean anymore. But after my coolant temp reaches about 200 the car shuts off, and then I can't restart the car until it cools down a bit.
Now I am not 100% sure its that, its just a hunch due to the symptoms.
It really seems everything started going haywire after the update to the O29T firmware.
If I don't get this figured out this week, I will have to pull the MSnS and purchase a portfueler. My car has been down for 4 months now and its my daily driver so I can't realy sink any money into getting a daily to only sink more into it to keep it running....otherwise my car will never see the road again. I need to fix my car now.
I know its the MSnS and I am starting to beleive its not for me.
#2869, "RE: Car Stalling Out" In response to Reply # 9
Was it running fine on the old firmware? Switch it back, then mess with the new when you have time.
You're brave to MS and all the custom work to your daily driver. As much as I really want to, (with my past experience) I don't think I could recommend that.
Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician
