I have a 1998 gmc k1500, fairly modified 388 stroker motor with Holley STEALTH ram injection, 30 lb injectors, 411 ecm tuned by BBP, the problem is when I first try to start the motor it cranks a quick second, fires and then dies, its not security related, on second try it will do the same but if I feather the throttle it will stay running and after about 30 seconds of working the throttle between 800 and 1800 rpms it will stay running at an idle. my feeling is its a fuel injected motor I shouldnt have to touch the throttle. Fuel pressure is 44lbs at the fuel rail. What should I be looking for?

 

Tune is wrong or there may be an issue with the cam sensor. No cam sensor codes?

 

Have to rule out tune that was done from data logging and then to follow that up there was an in person tune performed, there is a check engine light on so yeah codes are there, scan tool **** the bed, but will try to get the codes put on here by the end of the day, thanks.

 

Well is this a cold start or hot restart issue? When does it happen? In cold weather or all the time?
I they didnt have the car for several days attempting cold starts then the tune still needs work. Dataloggin and dyno/street run tuning is fine for driveability but does nothing for first starts. Warm starts is fairly easy but cold takes time

My car is 411 swapped and is the same way. It doesnt cold start real good yet and needs throttle for a few seconds before idle holds on its own. Cold start crank fuel tables need worked and you only get one chance to test per day. Warm start is generally fine but occassionally it wont fire but just crank and code will flash. Its something with cam sensor circuit but if i try to start again it fires up fine. Its alittle annoying but not sure what else i can do about that

 

Cold weather, or first start of day, also if drove and sat for a few hours in cold weather.

 

Yeah i think alittle work to the fueling on cold crank is what it needs. If it needs throttle i would guess thats sayin its to rich and needed the air to start. Quick test is tryin lowering fuel pressure down a good bit to see if it starts easier

 

I will try dropping it to 30lbs, and see what that does. And if no change I will drop it to 20lbs

 

May try something like 36 then 30. Alittle smaller step, and dont run it at those pressures. Just test the starting

 

yeah, I got over $4000 in this motor, not wanting to burn up a piston

 

just ran a scan and codes are po1336 and po1346.