That sounds like you are getting too much fuel on crank then if you go 100% TPS and it starts fine (which shuts the injectors off on cranking).

Have you tried taken cranking IPW *out* at that coolant temp?

btw, I have yet to see warm start issues with the same injectors on the Evo 10.

- Bryan

 

wait u posted before u did?

https://www.evolutionm.net/forums/7657925-post176.html

 

Yeah, it seems rich to me too as when I let it crank without throttle and on the rare occasion that it starts on it's own, it smells extremely rich and stumbles like it fowled the plugs.

On the tables available in the stock ECU, I've never been able to get the car to start reliably without using the throttle. There are a couple different branches in the code the ECU can take too which I don't think has been fully looked over. The changes we are making might not even be in the branch that is actually being used under these conditions.

What's odd is that IPW is supposedly cut at WOT when cranking, but the car starts with the throttle at 100%. If the injectors are off, how the hell does it start?

I always thought that fuel cut at 100% was just to clear out the motor if it got flooded but it won't actually start at 100%. Thus you crank the car at 100% throttle for a few second and then close the throttle and after that, it will start.

 

Sorry I guess I should have said I no longer have those issues.

- Bryan

 

well if you tried cranking normally and it won't start and THEN go 100% TPS and it starts that means it's most likely rich on cranking. The car is starting off the fuel in the cylinder from the first cranking attempt.

So have you tried taking out cranking IPW at the coolant temps you are seeing an issue with? I've had to do that on most larger injectors on pump gas.

- Bryan

 

I scale down the cranking enrichment just for the change in injector size. I also scale the primer pulse in a similar manner. Beyond that rescaling, I have also tried a lot of different (lower) settings to try and get it to start beyond just rescaling for injector size.

I've even got the setting low enough that the car won't start at all. To me, it seems like there should be a sweet spot in there some where but after months of messign around with it, I never could get that sweet spot.

Cranking then going 100% is not what I found works best. I go 100% throttle before I even turn the car on. 2-3 seconds of cranking and it fires right up.

If 100% cuts fuel all together, it shouldn't start at all. It also seems like the primer pulse would have cleared out on the first couple rotations. Not 2-3 seconds later of cranking?

Also, the car is VERY insensitive when the motor is cold or hot. I can double or half the startup tables and it still starts fine in these situations. It's just when the car has sat for a bit after being warm.

 

I know for myself I adjusted every single cranking fuel table that was found by mrfred and it made no difference. I took fuel out to the point the next step was 0 fuel which i did and logged 0 ipw during cranking and the car would not start (obviously). But it never felt the changes made a single difference - I worked with these for a year and recently just gave up.....

 

I also don't think start up fueling has to be that precise.....I mean if that's the case the 2000's should be really hard to get to start, I mean they are big f***ing injectors. Just used the basic math formula and only adjusted the first pulse table and when i had the 2000's in for those 2 weeks it started great all the time.

The 1000 issue just doesn't make sense....and it does seem to be more evo / stock ecu related but not all - which just makes it hard to figure out why its happening..

 

I went through the section of code that MRFred found to be related to startup and for 96530006 ROM, I don't think the tables we have been adjusting are the tables that need to be adjusted.

I've got to head to school, but I'll look at it a bit more closely tonight.

It would explain why the changes we've been making have not been able to make a noticeable change.

 

Didn't you say in a previous post that by adjusting one (or several?) of the tables, it was possible to make it so that your Evo wouldn't start?

 

Yeah, that was the only thing throwing me off. I can get it to not start by setting some of the values to 0. However, I could not get it to repeatably make an impact other then just not starting all together.

I was just looking at it briefly but it seems like some of the conditional values used in 96530006 make it impossible for the code to ever use some of the tables you defined.

 

Send me an email with the code range that you are examining. I'll look at it tonight.

 

Mrfred will probably end up correcting a misunderstanding I have in the code, but there may be something in the code that essentially locks the minimum IPW and that minimum might be what's causing the issue.

 

Just an update with my car. My starting issues were worse than anyones on here from the videos posted. Mine takes longer to start than that.

I switched from e-85 back to 93 octane. On e85 my cold starts were fine. But hot starts were terrible. On 93 the problem worsened. It had cold start issues as well.

I finally switched to RC1000s and car starts like factory both hot and cold.

I dont have the access to ecu like evo 8/9 cars. I am working with 95ecu with dsmlink for tuning. So while I was determined to find the solution. I gave up.

 

I gave up as well, and my problems magically disappeared!