Holley sniper issue on newly rebuilt motor

[GloNDark]

I am having a hell of a time with a weird issue on the 70 Bronco that I am building.

Built 302, Flat tappet rv cam, Edelbrock Aluminum heads and intake, Toms Shorty headers, 2 into 1 exhaust.

Runs great, starts easy, idles right at 750. The issue I have been seeing is always around the follow scenario. Drive at a constant throttle down the road, come to a stop, clutch in/neutral and it dies. Half the time it starts up right away, half the time it takes 30 seconds of cranking to start.

Any have any ideas where to start? I am brand new to after market fuel injection.

 

[Broncobowsher]

Do you wait the 2½ seconds between key on and cranking?

Might be better to check some holley specific sites. Generally it is too much, or too little fuel.

 

[chuckji]

Definitely check out the Holley Sniper support forum.
One key adjustment point that many overlook on a new install is the idle air control (IAC). What is yours set at in Neutral, idling at normal engine operating temperature? You’ll want it between 2% ~ 10%.

 

[GloNDark]

Thanks guys. I've been over there reading. I have ALOT to learn about this apparently. haha

My IAC at operating temp in neutral is 5%. I'm reading that there is parts of the fueling map "learn" that the self learning function does not touch. And that is usually the issue. So now to take a few drives around the neighborhood and get some data logs.

 

[chuckji]

Yep, the data logging feature is a powerful tool.
Good luck.

 

[4xfun]

Can you have heat soak or vapor lock on a high pressure fuel system? I have only played with a regular carb, so I apologize ahead of time if this is a stupid question.