Help, my car likes to flood itself!!!!

[dsmoverboosted]

Well I think my car is flooding itself when it sits for a long period of time. It drives great, I can boost till 7000 rpm fine and it pulls but if I let the car sit for a long period of time (like overnight or when I'm at work) I have a hard time starting it. I go to fire the car and it just cranks till i hit the gas a bit, then it will fire but its real rough like its only firing 2 or 3 cylinders and if I let the throttle go it will die again. usually I go open the hood and wait a sec then go back and it fires up and its fine after that till the next morning when it happens again.

I even leave the car for an hour or 2 and it fires fine It just seems to be when it sits for a long period of time like overnight. Also when I am trying to start it my exhaust pipe stinks like gas bad till i get her going.

It seems to me that there is something causing my car to leak fuel into the cylinders and it builds up overtime and when I open the throttle it lets enough air in to fire it up and burn the extra fuel enough for me to fire it up.

Now I don't know if this could possibly have anything to do with it but I always open the hood when I can't start it and It seems to fire up afterwords. It might just be a coincidence but I thought I'd mention it anyways.

Recent work i have done is I have done a head rebuild and reinstalled it myself and I replaced the ecu just before this happened because the old one had leaky caps. I used a 93 tsi 5speed awd ecu in my 91 5 speed awd.

I am not sure what could be causing this but it has made me late for work a couple of time and I need this fixed. Any ideas what I should test or how I could figure out what is causing this????

Thanks Axe

 

[dsmoverboosted]

Someone please help me. I am not sure what to check. Could the fpr not be letting the pressure out when I shut it off and its leaking because of the pressure or could an injector be stuck open without it affecting overall driving?

I am pretty sure my ignition is fine since it drives and boost's fine without any sputtering.

Someone please help

 

[Old Mitsu Tech]

Pull the vacuum line on your fuel pressure regulator. Do you smell gas? If yes, then voila, there you go. If not, ..... You might have to do a leakdown test. That would require a fuel pressure gauge. Rent, or buy a cheap type of fuel gauge. The adapter is the killer though. You might have to go to a pro for that one. I am wondering about a leaking injector or something like that. You might want to scan the computer for codes and see what codes you are getting. When you try to start and it is running sucky, shut it off and pull the spark plugs. What do they look like? Are they wet? Dry? etc. All of them or just a couple of them. Which ones? This is only associated with start up? Cold, or hot restart? Give us some specifics and post them. pm me and I'll take a look at your post.

 

[Lenn]

If any of the spark plugs look fouled, is it a possiblity that he has a leaky injector in that cylinder. My 91 GSX that im rebuilding had that issue before it went under the knife

 

[Lenn]

Sorry, just finished reading "oldmitsutech" post.

 

[lovemylaser]

My '90 laser RS turbo had the same problem, just at different times...it was completely erratic when it would flood out...would usually do it while driving however, and leaned towards doing it on hotter days, then sometimes wouldnt do it for months, just totally random, no trouble codes, everything checked out, drove me crazy. turned out it was my ecm. you said you changed yours right before the problem started, have you tried putting your old one back in and seeing if problem persists?

 

[ddavisaf]

Coolant Temp Sensor possibly. First guess would have to be a leaky injector though.

 

[dsmoverboosted]

Well i checked the vac hose on the fpr and it's dry.

I did a leakdown test 2 months ago before I did my head rebuild and the numbers where 5-15% across with the number 2 at 15% which is acceptable I read.

Well I do get engine codes when it happens they are, coolant sensor, ignition circuit, crank angle sensor, oxygen sensor and the fuel pump relay. There might be another one or 2 but ill have to double check that tomorrow. Also the coolant sensor might be stored from a while ago so it may not be relevant

And ya it only happens when I fire it up cold, after I finally get her started everything is fine like it just came from the showroom. Even when I shut off the car for a couple hours it fires fine. It's more or less after a long period of time.

Today after I worked a very long 13 hrs shift it was the worst it's ever been, I almost thought it wouldn't start. I removed the mpi fuse to see if maybe it would burn off the old fuel and it wouldn't fire at all even with my foot to the floor and when i put the fuse back in it did the same thing sputtering hard and then dieing if i let my foot off the gas.

I have yet to check my plugs because I am always in a hurry when this happens but as soon as I have time I will

My old ecu is garbage because the caps leaked on the circuit board and it caused my car to run rich all the time, it was not drivable at all. I got a great deal on a new one (which is epromed ) and when I bought it I looked at the caps and there fine. As soon as installed the new ecu my car drove great but then about 2 days later this started happening. It seems like such a big coincidence that I installed my new ecu and it started happening afterwords but I couldn't see how it could cause this with good caps.

So how would I test if the any injectors are leaking? Any other things I should check while i'm out there?

Thanks Axe