cold start problems

[iwbs]

Hi everybody, as its getting colder outside I am having some new difficulties starting my car. Maybe someone could take a look at my cold start settings. After cranking for about 10s engine is trying to come alive, but it dies almost instantly. No matter how many times in a row I try, nothing changes. As you can see from vemslog I tried different settings, but it all ended flooding the engine. Here is my latest vemslog and memberspage:
http://www.vems.hu/filethingie.php?action=list&subdir=iwbs/cold%20start%20problems
http://www.vems.hu/wiki/index.php?page=MembersPage%2FIwbs

[MWfire]

Config?

[Manick]

Are you running petrol or E85? Closer to 0 degrees celsius, you need to add quite alot on the cold start to get it to fire when running E85, that part can be a real pain for us in the colder countrys.. :/

[mattias]

You could use many more cycles of afterstart (100/66 now, go for at least 400/400 to begin with).

You can lower your warmup enrichment, just watch lambda as it warms up. Disable EGO correction for this.

Not sure what injectors you got,  you could try firing them "simultaneously" instead for a greater chance of fuel in the intake once the engine turns. This can make warm starts a bit fuzzy as injector opening times and the settings for injector characteristics can produce very little fuel. Change the setting and you will see.

You picked 55% crank VE pretty much out of your VE table @ 100 kPa. That is a good start, but you can experiment with a bit more as well.

[iwbs]

Thanks for the tips! It's running on petrol and I'm using OEM 330cc injectors.
I forgot to upload config in a hurry, will do it later.
As I mentioned my first attempt ended flooding the engine therefore I tried cranking VE 45% and afterstart cycles 400, also decreased cranking enrichment a little bit. That's how I got it working somehow.
Had to increase warmup enrichment by the lambda readings.

[mattias]

Config is included in the vemslog file, so no need to upload.

You have waaay too much cranking enrichment for gasoline.
Try 200% at 0 C and 140% at 20 C.

While cranking cold and not having any idle IAC valve, I generally have good results keeping throttle closed and when I hear first stumble of the engine then give it some throttle to raise idle speed.

[iwbs]

At the moment it`s 350% at 0 degrees and 150% at 40 degrees, engine starts after few seconds of cranking. Tomorrow I will try to decrease cranking enrichment and we`ll see how it goes.
Here`s the latest vemslog: http://www.vems.hu/filethingie.php?subdir=iwbs/latest%20vemslog

[utkuselamoglu]

which coils are you using?

[MWfire]

At the moment it`s 350% at 0 degrees and 150% at 40 degrees, engine starts after few seconds of cranking. Tomorrow I will try to decrease cranking enrichment and we`ll see how it goes.
Here`s the latest vemslog: http://www.vems.hu/filethingie.php?subdir=iwbs/latest%20vemslog

From bmw stock car, cranking enrichment. For vems you need to scale with warmup enrichment.
bmw
temp   multy      
-30   9.66      
-20   7.5      
-10   3.45      
0   3.08      
10   2.5      
30   2.1      
60   1.8      
90   1.25

[Teräsmiäs]

Hi guys!

I really need our help because my car won't start in outside. There is -10degrees outside temperature.

2.0L Saab engine, with 1000cc injectors and coil is Bosch 2x2.

Little bit of promissing but when engine goes to warmup enchricment about 0-1sec and then engine dies.

Here is print screen about my settings. Tried so much change the settings but nothing helps. Flooded my engine and tomorrow i am gonna buy some new spark plugs.

[MWfire]

What injectors(low z or high z)? What voltage do you have on cranking?

Cold start with values from nissan sr20det
https://www.youtube.com/watch?v=23q2jm2mnyE

[Teräsmiäs]

What injectors(low z or high z)? What voltage do you have on cranking?

Cold start with values from nissan sr20det
https://www.youtube.com/watch?v=23q2jm2mnyE

High Z. Voltage is like 11V while cranking. When it was warmer like 20degrees car would start with those settings but still needed couple of times to start up.

[MWfire]

What injectors(low z or high z)? What voltage do you have on cranking?

Cold start with values from nissan sr20det
https://www.youtube.com/watch?v=23q2jm2mnyE

High Z. Voltage is like 11V while cranking. When it was warmer like 20degrees car would start with those settings but still needed couple of times to start up.

Do you have log of cranking?

btw i thin you have to low enrichment. Try 500% at 0deg and 600% at -20deg. Also check crank VE, usually is 70-90.

[Teräsmiäs]

What injectors(low z or high z)? What voltage do you have on cranking?

Cold start with values from nissan sr20det
https://www.youtube.com/watch?v=23q2jm2mnyE

High Z. Voltage is like 11V while cranking. When it was warmer like 20degrees car would start with those settings but still needed couple of times to start up.

Do you have log of cranking?

btw i thin you have to low enrichment. Try 500% at 0deg and 600% at -20deg. Also check crank VE, usually is 70-90.

Sorry i forget to get log. Tomorrow i will take log with new spark plugs.

Are u sure about that 500% that seems quite high? Because those injectors are quite big? Req_fuel is now fine with the map when engine makes idle its afr is like 14.0.

What about that crank advance? My stock advance is 12 while idling at 800rpm.

[MWfire]

What injectors(low z or high z)? What voltage do you have on cranking?

Cold start with values from nissan sr20det
https://www.youtube.com/watch?v=23q2jm2mnyE

High Z. Voltage is like 11V while cranking. When it was warmer like 20degrees car would start with those settings but still needed couple of times to start up.

Do you have log of cranking?

btw i thin you have to low enrichment. Try 500% at 0deg and 600% at -20deg. Also check crank VE, usually is 70-90.

Sorry i forget to get log. Tomorrow i will take log with new spark plugs.

Are u sure about that 500% that seems quite high? Because those injectors are quite big? Req_fuel is now fine with the map when engine makes idle its afr is like 14.0.

What about that crank advance? My stock advance is 12 while idling at 800rpm.

Upload a config so i can take a look.