compression test? maybe its not building enough compression until after a few minutes of turning over?

if thats the case, decelerating in gear makes far worse damage..

 

I'd be super screwed if it did.

 

I'm still somewhat a n00b, and not the most talented at this sort of thing.
However, it sounds like the change of ECU is what threw you off. bad air-fuel-spark ratio. Try hooking the old ECU up again, and see if that helps.

 

The old ecu is a standalone, meaning the whole harness ecu ect.. are aftermarket and are not interchangeable. i can't just simply "put the standalone back on" plus I sold it..lol

 

Compression is great over 100 on all faces front and rear. (when not flooded)

 

Well, obviously you're getting too much gas when you crank it over, that or there isn't enough spark to ignite it (not as likely)

Too much fuel would be:
Too large of injectors
Bad/leaky injectors
Too much fuel pressure
Too much duty on the injectors during cranking (not adjustable on the stock ECU and thats what we're working with)

You said it runs fine when it runs, no? Or did my mind just insert that itself between reading and replying? Because if it runs fine, we can eliminate having timing thats WAY out to lunch from probably causes.

I'd try a fuel pump switch first. Thats goign to narrow down the list of possible fuel related problems. If you can flood the car, shut the pump off, crank it and fire it up then flip the pump on....I'd begin looking fuel pressure and injector size. If that doesn't work, I'd begin looking at leaky/dirty injectors.

I'm having some fuel delievery issues during startup on my car as well. Every ******* problem you have my car gets. Are you my long lost borther or something???

 

LOL! I was born in Ontario.... Do you know who your dad is? lol..

 

Not exactly. Since there is absolutly no combustion, the oil, whether it be motor oil(OMP) or premix, will not burn off and will probubly lubricate better then if there was combustion.

I don't know about dry starts. I used to have my fuel pump wired up so that while cranking the motor, the pump would be off and the motor would start on the fuel pressure that is in the lines. Usually there was no fuel pressure after about 30 min, I had leaky metal fuel lines. a second crank would start it up no prob. This worked out excellent with my old engine that flooded without this little wiring job. Now I have a diff motor and I have the pump wired up the way it was from the factory.

 

i say swap in an s5 n/a ecu and see how that goes...its a long shot but it might do the trick. personally i don't know how you can run an n/a motor on a turbo ecu.

 

yeah I don't know.. i was told you could... I just find it hard to believe that the car won't even start with the T2 ecu... I mean how much more fuel could a T2 engine need to start??

 

didnt it run before on the TII ecu/injectors? i have 750cc injectors, and when i setup my ecu for 550s, it still has no problem starting

 

It was running with the standalone on the 550cc's and it had no issues starting.. It has not since I put a stock ECU/MAF/Wiring harness in.

 

I didn't get to read all 5 pages but are you absolutely sure the ECU/MAF/Wiring harness are in good condition?

 

you know, it could be a bad injector, i had one stick wide open on my S5 TII, and it was a bitch to start, caused instant flooding, what kind of shape was the harness in? was it britle? have you messed with the intake mani yet? casue if i remember correctly you are using S5 N/A intake right..... if so could be a hella bad vaccuum leak on the 5th and 6th ports...

 

The harness was pretty brittle. I reloomed most of it. The intake was removed and repositioned 12 times now. I replaced the gaskets and used a thin layer of RTV. I have been removing it as 1 peice since.. I have also replaced the injectors. It must be wiring related. I bet this T2 harness I have was total ****. Imagine that I got burnt using the FS section on this forum again..

 

Can I use a N/A harness with a T2 MAF?

 

anyone know if I can use a N/A harness with the T2 ecu and MAF? Or how about a T2 MAF on a N/A harness with a N/A ECU?

 

http://www.rotaryresurrection.com/2n...to_turbo2.html

 

I guess if I read that right.. on the s5's it doesn't really matter what combo you use???

 

Still looking for suggestions. I bought new injector connectors and i am looking at purchasing another harness.

 

I am going to try to wire the new injector connectors directly to the ECU and bi-pass the OEM harness all together.

 

i think that would be one of your best guesses on fixing it. ^. or like you siad try to get anouther harness, wich sucks, but is doable, def thinking its the wireing though. old britle harnesses dont bend well, and was prolly crammed in a box when shipped to you.

 

It was rough... And brittle... Probably grounding out somewhere...

 

or shorting with other main wires.

 

Somethin..LOL. My new clips should be here soon...