Car flood when attempting to start

saturnsc! · Post by **saturnsc!** » Sat Mar 11, 2006 11:07 pm

I am using MSI v2.2 board with MT v.2.25B514.

I recently finished turboing my car. It is an OBD2 saturn. I was running the MS NA for a few months so I know the runaround of it and it was working fine prior to turboing it. I have a base map off of someone with a similar setup and am attempting to use that in order to get me started semi decent. I reset the req fuel values and changed his values that should be different to my values (he had low impedance inj, I have high imp).

Basically, every time I try to start it, no matter how low the fuel input, I flood the thing. You can smell gas after 5 to 6 attempts like the mixture is REALLY rich. I have tried taking off some of the enrichments, decreasing the reqfuel by half, decreasing the cranking PWs to .1 for both and it still is not even sputtering. When I pull the fuel pump/injector fuse and crank it over to get all the excess fuel out, sometimes it starts for a good 2-3 minutes until all of the gas burns out (scary huh?). I just want to get this thing idling before I go to change the oil.

I have tried using my N/A map and simply change the values for the injectors (reqfuel) and it still wont sputter or anything. There was an incident the last time i ran the car on MS that might be related. My car had sat for 2 weeks in really cold weather in december, the map was tuned pretty good, so i started it up and let it warm up for 5-10 minutes. I went back out to hop in my car and it was flooded. I didn't really inspect for reasons, but it had been ran at that temperature before so it wasnt the warmup enrichments. I ran the car on the stock pcm to the garage where it sits now and havn't ran the MS since until now. Both incidents have flooded my car and I am thinking maybe something internally is causing this. I had the unit built for me so it is more difficult for me to diagnose a problem internally but I can still take a look.

Thanks for your time, I know it is long

.

Boris740 · Post by **Boris740** » Sun Mar 12, 2006 3:23 am

I had a similar situation while back when IAT thermistor got accidentally disconnected. MS thought that it was extremely cold and poured in the gas.
Check both CLT and IAT thermistors.

saturnsc! · Post by **saturnsc!** » Sun Mar 12, 2006 6:43 am

Boris740 wrote:I had a similar situation while back when IAT thermistor got accidentally disconnected. MS thought that it was extremely cold and poured in the gas.
Check both CLT and IAT thermistors.

Both sensors are reading correctly. Both are reading about ambient~60 degrees.

Boris740 · Post by **Boris740** » Sun Mar 12, 2006 7:04 am

I am no injector expert but could it be that one of the injectors is stuck partially open. This could conceivably be a intermittent condition.

saturnsc! · Post by **saturnsc!** » Sun Mar 12, 2006 7:13 am

I am thinking that one of them is stuck open, but all of the spark plugs have gas on them after it floods.

Also, I opened the MS case and nothing is broke or damaged/fried so it isnt the internal workings of it.

jonfx4com · Post by **jonfx4com** » Mon Mar 13, 2006 11:41 am

I think your best option is to crank it with the injectors out so you can see if they have a real big (always open) problem. Fire precautions are a good idea. If you drive down the req fuel and start pulses to virtually nothing and it still floods you have:

1 massivley excessive fuel pressure
2 injectors failed and so stuck open (unlikley for all to be faulty)
3 MS injector outputs fried and shorted to ground holding injectors open, electronics cant be diagnosed by looking at it, I have plenty of fried components everday that look just fine from the outside.

CAn you post an MSQ file for folks to look at and maybe a data log would help, just a snapshot of the cranking data would be good.

Jon

saturnsc! · Post by **saturnsc!** » Mon Mar 13, 2006 7:58 pm

Ok, so i ran the car on the stock computer and injectors perfectly fine. The car really dumped a ton of fuel, I had so much gas in the oil it wasnt funny, I mean, it had to have added probably 3 quarts to the total amount of oil. I changed the oil and ran it fine on the stock computer as said above so fuel pressure is fine, i am going to try to start the car on the MS with my NA map in the upcoming days, if it floods from that, I know that it is the MS, not the injectors.

Anyway, I have a datalog, just not on this computer, I will have to transfer it to this one at some point.

whittlebeast · Post by **whittlebeast** » Tue Mar 14, 2006 3:59 am

post your msq

saturnsc! · Post by **saturnsc!** » Tue Mar 14, 2006 8:45 am

Here it is.

jonfx4com · Post by **jonfx4com** » Tue Mar 14, 2006 8:54 am

I think if your running it with 12 cylinders and 12 injectors configured to mask a tach problem you better fix that one first or you are just pis$#@g into the wind.
What firmware are you using on the MS1, I cant open the MSQ file.

Jon