Well with all the great definition discoveries out there for various symptoms, I have to ask you which one would be appropriate for me. I'm running the E and I currently have the IPW patch on there which has helped immensely for start ups. I'm running into an issue in the cold or very cold where after start up my car wants to die out. I know my scalings and latencies are spot on due to very good fuel trims. I'm wondering if any of the other patches would help my condition. I basically need a cold start table that just deals with the cold start. Everything else is perfect. Would the patch in the "New Maps for 7 and 9" ie.. base low coolant trim maps or the new "min temp for closed loop" help? Could I just set the min temp for closed loop super low to get my issue resolved. Thanks for the help. I appreciate all the hard work everybody does in the forum. Or, would keeping the system in open loop be a resolve, ie bit 4 of the periphery0?

 

That is an odd problem. I have modified IPW values for startup as well, running ethanol, and have never had any issue. The coldest we see here is about 36 or so though.....

 

It only wants to die out for a little bit- until the needle on the temp gauge just clears the "C". After that, it will run on it's own without me blipping the throttle so it won't die. This is only on cold days though. When it's warmer out, I have no issues with starting or warm up.

 

Well I just added the min temp for closed loop definition and cranked it down to -7C=15F. I didn't touch the gas pedal and it wanted to stall out but caught itself about three to four times and then idled very well at 1500 like a normal car should. The ECU did well adapting to the cold after that. I'm pretty sure I found the resolution to my issue. I'll know more tomorrow when it's really cold and hasn't been ran in over 9 hours.

 

If going into closed loop fixed it, i would think your low fuel trim is off... What exactly are your logged STFT's?

Post your MAF scaling table and Cranking and Post-cranking enrichment tables (I assume you called these "IPW Patch", right?). Also log IPW, RPM, TPS and coolant temp at start-up and post that. I may be able to point you in the right direction..

 

There must be something drastically different for startup on Evo's vs DSM's. My 2g starts up great even when below zero. I crank it for a second and its idling nice, and my ISC doesn't even work. My 1g also has no issue starting although I don't remember it getting below zero last winter when I was driving it. Yes these are both on E85.

 

The difference is not so much between generations, but user settings on modified cars and E85 blends that differ by state. My Evo starts perfectly fine in subzero temps in MN. When you start a car that is set-up with E85, what lights up is gasoline, not ethanol. So you need to either have more gas in the blend or enrich the mixture for start-up. MN has at least 30% gasoline in E85 during winter.

This topic needs to be in alternative fuel section btw...

 

My car also runs like crap in freezing weather if I try to drive it before the needle starts to move a bit. My fuel trims are spot on (+/- 1.5%), and with the stock min closed loop temp of 45F, the car is in closed loop within 30 seconds of starting. For sure, ethanol does not like to light off in cold temperatures. The station I use for E85 dispenses 85% ethanol year-round, so I suspect that's part of the issue.

For the last couple days, I've been logging cold engine startup, and what I've been noticing is that the car runs a bit rich before closed loop kicks into action. My thought is that the car will run better cold when its rich rather than lean, so perhaps the better option would be to raise the min temp for closed loop rather than lower it. I suggest trying something like 100F (38C).

 

Hmmmm....I will try this tomorrow, as well. I am having the same issue and didn't want to adjust my load for Closed/Open loop transistion for MPG reasons.

My stock setting is 0C is that the normal?

 

I raised the min temp for closed loop to 38 and bam- no more issues! It's so nice to be able to walk away from the car after I start it in the mornings now and not have to worry about it cutting out on me. Thank you for the suggestion- it worked perfect!
By the by, my fuel trims are +-1.5% also, so I knew that wasn't the issue. This just made my day, I've been trying this and that for about a month now with no great results.