383GTABoy

I just got the new motor running and decided to go with 6E. It runs great but if I shut it down hot it will not restart. It restarts fine with 32b. I can restart it in 6E with just a tiny shot of starter fluid or just a bit of gas in the intake. It fires up instantly when is cold. Any ideas of why the injectors are not firing. It has 49 psi at the rails. I am using tunerpro with the ostrich to tune.

Z69

See table: Crank Fuel PW vs Coolant Temp.
Raise numbers slightly in correct temp range until it starts correctly.

Be careful with ARAP and iron heads.....watch your knock counts!

383GTABoy

Thanks, ill give it a shot in the morning. Ill take the spark back a few degrees too. I was getting a few more knocks than usual but it wasnt too bad.

383GTABoy

Well i gave it a shot but still didnt have any luck. I raised it all the way to 15 but it still wouldnt start.

vernw

iTrader: (2)

Any chance it was too high already and it's flooding out?

383GTABoy

No its just not getting gas. It will start with just a tiny bit of gas sprayed in the intake.

Z69

Are you holding the throttle open while cranking and adding fuel?
If so, your adding more air too.
Also, at 15, your still not adding as much fuel as a 32 bin I think.
Try 25 and see what happens. Or go back and edit your PW vs Ref pulse table.
Start comparing the differences between your 32 & 6E bins in the startup stuff.

91GTABird

I just compared a few for you and most of them are showing between 12-24msec from 90*-200* F* range on the $32B.

Just looked at the ARAP and its showing 8-12msec in the 90*-200* F* range.

383GTABoy

Thanx Ill try bumping it up tonight to 20ms and raising the ref pulse table by 20% or so. Im going to also add some into the lower tables since 1-8 are blank. Whats up with that?

Z69

The later SD bins are that way too.
My guess is it lets the engine get up to crank speed first.
Notice that the PW mult. is reduced also on the 6E and later.
There's many ways to add fuel during start up.

MikeT 88IROC350

You may have to take some fuel out with the ARAP bin. That's what i had to to do to fix my hard start when hot. It was mostly after the car had been hot, then I went and parked, and after like 30-45 minutes or so, it would crank long to start. I thought first i had leaky injectors, and car was flooding with fuel as the pressure bled off. But I found that was just normal pressure bleeding down after shutdown.

So I played with the crank fuel pulse width vs temp table, and I got it fixed. I had to back down the values when the engine was in the "warm" range.
Starts good now!

383GTABoy

Well i changed it to go from 15 to 24 and added a some into my pulse width ref table and she is starting great. One more problem down. Thanx

TPI-Formula350-

Just found this post when I did a search and I was having the same problem with my arap. I changed my PW at temp 198-90* to 15-24 and its worked well tonight. Thanks this has made me crazy for 2 years...lol