LsF-150

iTrader: (2)

any codes? a failed cam position sensor will cause extended crank

oakley6575

iTrader: (5)

No codes. Cam sensor is good. Looks like I might have a handle on it now. I doubled the first pulse mass table under cranking fuel and it seemed to help. So I tripled it and it got even better. I guess it needs a pretty healthy pulse to fire when its hot. I don't know if that is due to the bigger cubes or different injectors or...? But it looks like I found the problem. Thanks everyone

AndysC3

iTrader: (14)

I was have issues with hot starts. I use EFI Live. I added air to the startup airflow correction and it has worked very well so far.

oakley6575

iTrader: (5)

Mine hates idle airflow. I have to zero the airflow out above 120 degrees

oakley6575

iTrader: (5)

I give up. I change stuff and think it gets better but it just isn't consistant. Ive tried every cranking table I can find except using the second pulse mass... Any insight on this table?

2007chevy5.3l

iTrader: (21)

Cant look at your log since I use EFIlive but whats the IATs and the AFRs when this happens?

oakley6575

iTrader: (5)

My iat reading is from the factory location in the MAF. In vegas, once the truck is turned off, the ect climbes for another 10-20 min. The underhood temp is crazy high it never wants to start in this case. The IAT can easily get up to 140 from what I've seen. What effect does the IAT have on cranking tables?

oakley6575

iTrader: (5)

Also, I don't understand what people mean when they talk about cranking AFR. You don't get an afr reading until the truck has started. So I guess if your asking about the afr on initial fire up, then its right around stoich.

oakley6575

iTrader: (5)

Bringing this back up. Does anyone know exactly what the FA mult stage 1 table does under the cranking fuel section? I'm having a hard time understanding how that table effects fuel. Thanks






I went throught the fuel system this weekend. I added a aeromotive fpr with a vacuum reference. Fuel pressure was set to 58psi with the vacuum port open to the atmosphere. It idles right at 46psi with the port hooked up to the back of the manifold. I also changed the fuel filter and the pump is still strong.

LsF-150

iTrader: (2)

If your not running beta, can you post a tune? Have you done anything with the Startup and Friction Airflow tables?