Any info/tips are appreciated. Evo 9, 70k miles, built 2.0, flex fuel, MAF

Recently just started having this issue, car sat for about a month with pretty much a Empty tank of e85, but there was still e85 in the lines. First startup after the month of it sitting it started right up with the e85 it barely had in it, idled smooth as well. Pumped fresh 91 in it and it was also fine, drove it normally for about 30 min then finally got on it, started knocking(pre detonation) in the 3 pulls that I did. Let the car sit and it cooled down. Went to try to crank it but no start. cranked for a while until it finally started had to give it some gas. The next day it just wouldn't start at all, crank no start. The day after it started right up NO issues whatsoever! idled smooth. I shut it off after about 20 seconds to see if it starts again and nothing, same problem. It would crank barely start, idle poorly then die after 5 seconds.

I checked for boost leaks, MAF sensor, battery is ok, cleaned the injectors. 2 Codes came up, P2228 and P0113 they seen related to MAF but I'm not entirely sure, anyone else have this issue or these codes?
Any input is appreciated. Thanks.

 

whats the afr's read at idle?

 

Super rich, under 10. at times between 10-11 but it'll last about 2 seconds before it dies.

 

Do you have an OMNI MAP sensor?

 

Yes I do, omni 4 bar.

 

Evo 9, 70k miles, built 2.0, flex fuel, MAF

Car was tuned on flex fuel, and ever since then it's been on e85, about 2 month after the tune I switched to 91, and drove it fine for about an hour. Let the car sit and it cooled down. Go to crank it and nothing, just doesn't want to start. So basically I'm getting a crank no start issue, codes came up. P2228 and P0113. A week later I figured out that it was dumping wayyyyy too much fuel on start up. So it's flooding the cylinders while cranking and it doesn't want to start.
Only way it starts is if I have the gas pedal down and once it idles, it idles super rich and wants to die so I have to keep It at 3k RPMs for about a minute. Once it's warmed up it idles fine and drives fine!!! The other way I can turn it on is if I disconnect the injectors and since there's no gas getting dumped in, it burns the extra that's been in there and turns on.... Still have to do the 3k RPMs tho.

Now, the weird thing is once it's warmed up, it turns on n off no problem!! So Its only flooding all 4 cylinders when the engine is cold! I have no idea what it could be.

Things I've tried:
New MAP sensor, New MAF sensor, injectors were cleaned, Checked fuel pump for pressure, checked for spark, Boost leak tested,
any input is appreciated, thanks.

 

It's your tune. Too much IPW in the startup tables.

 

I was also thinking that but I forgot to mention, after switching to 91 and driving it for that hour, I did 3 pulls and each time it knocked on WOT. Then then the no start issue started happening. Kinda hard to believe it is the tune because the person who tuned it is super known in my area and almost every evo owner gets tuned by him, has been doing this for years.

But yes it could be the tune as well, just wanted to get input. I actually contacted him and he said to try putting e85 in it and see if I have the same problem.

Thanks for tip man

 

I don't really know how those flexfuel roms are set up, but you can always log IPW during cranking/startup. Once you have those values you can compare them to the stock values. You will have to account for the difference in injector size over stock. I don't know what injectors you are running, but even if you don't have access to your flexfuel rom values you can look up the common gasoline scaling for your injectors. You can derive the scaling ratio of stock injector scaling divided by your injector scaling. Apply that ratio to the stock values and they should be pretty close to what you are logging. If what you are logging is way bigger then you know the values are too high.

I mean it could be something like the ecu thinking its got e85 while your cranking for some reason and using e85 starting values when it should be using gasoline. Again though I don't know much about the flexfuel implementations to the stock ecu so that's a bit above my head.

 

forgot to mention you will need to subtract Injector voltage latency "Dead time" from your logged values. So during cranking you will want to log voltage as well. The dead times for your injectors should also be available with the scalings. Find the value that matches the voltage you are logging and subtract that from your logged cranking IPW.

 

Holy ****, how is it that every time I have a problem someone is experiencing the exact same thing on this forum at the same time.

Do we have the same tuner? The E85 tune has been solid for years, but I've never used this 91 map before, I just switched to it the other day for the first time. I'm not on flex fuel but the same identical cold start behavior. If I open the throttle the car seems to get better but I wasn't sure and ended up pushing it back into the parking spot.

When I switched from E85 to 91 the car was already warm and I put 60 miles on it no problem. However, idle was rich at like 10 or 11, and cruise seemed fine at about 13.

(Also, the oil light came on in the gauge cluster freaking me out, but oil pressure gauge and level are fine, so it's a dead sensor. Covid hibernation has been doing weird things to this car, there's something new every time I take it out.)

Thanks for the info Biggie, I'll try to log it too.

 

Hahahaha how is it that you have my two exact problems? This is so weird. (Edit: they merged your other thread into this one.)

So this was my first issue which was the OMNI 4 bar map sensor, I replaced it and the starting issues went away. Now we can continue this adventure in your 91 octane thread.

 

Haha! Yes it's good it got merged, I didn't know how to delete my other post lol weird we have the same issue. but my problem has sort of went away. My fix was taking it to my tuner and he reduced the amount of fuel getting thrown by the injectors on start up. He said sometimes on bigger injectors, it doesn't shoot the 91 correctly, whatever that means lol I'm no tuning expert.

 

So you're issue was the omni 4 bar? Nice, easy fix. Although my starting Issue is fixed, there's times where it gets really rich and wants to die out but I just have to warm it up and it'll idle right. Guess it doesn't like the cold.

 

if the car runs fine on e85... and then rich as heck on 91... then it is the tune.

or the flex fuel sensor is not working correctly and not switching the map correctly