Newly Built FA20 - Vortech - e85 - Starting Issues
 

Hey Everyone -

So i'm about 400 miles into my newly built FA (Pistons -12.5:1, Rods, Valve Springs, etc) also am having problems starting the car.

I just recently switched to E85 (have the MotoEast FF kit) and the first tank (about 2/3 E85, 1/3 93) was fine for starts. Never an issue.

Now on my first full tank of E, the car will only start SOMETIMES.

I've been able to get some repeatable results by driving the car (if it started) then coming back, shutting it off, then trying to start it again - and it always fails.

Mechanically - nothing has changed since I went to E85. Everything worked great on 91/93, so I don't think it's a related issue.

I DO have ID1050x injectors and a DW65c pump - but again, those worked fine on 91/93.

I replaced the MAP sensor (no luck), I've checked for grounding issues, and now i'm thinking it either has to be:

A: Real, real crap E85
B: MAF sensor failure
C: Tune issue.

Info:
-Car is tuned on Ecutek by MotoEast - Mike's on Vaca till Tuesday.
-I've all but eliminated fuel issues - my pump duty % is 90% when cranking, and does make proper variations when the car is running. The car runs and drives great outside of this starting issue, so if it was fuel, i'd expect problems when under high load/RPM.

Any thoughts?

I have lots of logs (even when it won't start) if anyone wants specific info or has an ideas. I also have a few videos below.

Thanks!

No Start (push and go, prime, etc)
https://youtu.be/ha5jT-6x2xc

Starts (different day, same process as above)
https://youtu.be/NSfq_zNnqnY

I'll be honest man I didn't look at the videos, but are you having the issue only on cold starts and/or coolder days? It might need more fuel when you're cranking. http://www.ft86club.com/forums/showp...1&postcount=40

Not necessarily. While I do live in North Dakota, it's been 65f or warmer since for months. Plus, the car is garaged which is also insulated. I have heard of people having starting issues with E85 in colder weather, but that shouldn't be a factor here.

AS far as cold starts, some mornings I've come out, it starts. Others, it doesn't. But if it does start, and I go drive it, when I come back, turn it off, and try to start it again, it will not start. Driving me nuts.