Peteydog1971

I have a 1982 K5 Blazer. I just did LS1 swap. Everything is hooked up. I have 60 to 65 psi to intake. But won't run on its own. I sprayed a little Quickstart and it started. Not sure what the problem could be? Any help would be appreciated

1964SS

iTrader: (1)

Check injector pulses with a noid light.

ls1nova71

iTrader: (4)

If you don't have any injector pulse, check to make sure your grounds are all hooked up, and clean and tight. Also make sure the crank sensor is plugged in, it's easy to miss since it's behind the starter and you can't easily see it. If you do have injector pulse, then most likely your injectors are stuck. This is super common these days with the crap fuel we have. If the engine has been sitting a while, I'd put my money on stuck injectors.

Peteydog1971

I button new fuel injectors and still will not stay running? You could smell the fuel now.

Peteydog1971

I put new fuel injectors. Damn spellcheck

Peteydog1971

I tested the injectors and wiring with A noid test light. Everything was fine.

ryanleiker

iTrader: (2)

Can you elaborate more on the starting/not starting behavior?

Peteydog1971

When you turn the key it starts and runs for about a second or so and then turns itself back off.

ls1nova71

iTrader: (4)

Did you have the VATS deleted?

ryanleiker

iTrader: (2)

I 2nd this. That is exactly what mine did when I first tried to fire it after I hooked everything up. It thinks you're trying to steal the car because you aren't getting a signal from the BCM.

You need to go into the tune of the computer (hptuners, etc) and turn off the VATS.

Peteydog1971

The ECM was programmed when we bought it from the shop. They said it was programmed for our application. I have a curious question what PSI injectors am I supposed to use for this conversion? I am running 60 psi injectors, what should my fuel pump pressure be running at?

ryanleiker

iTrader: (2)

If you're running N/A, 60lb/hr injectors might be a little large for a stock tune/setup. Not positive though, especially if the tune isn't modified for them.

I would start with a base pressure at the rail of 58psi, as that's factory I think.

kilrcady

iTrader: (1)

vats vats

Peteydog1971

If it is the vats how can I test for it? The noid tester is showing power to the injectors? And if I spray Quickstart it will run? Doesn't vats stop either the fuel or fire to the spark plugs?

81LS1Camaro

iTrader: (1)

I run my fuel pressure at around 60psi. Double check your grounds like others said, this can cause weird issues, I left one loose one time. I would call the people that tuned it for you and make sure you are both on the same page. Maybe they forgot to turn vats off like others have said.

ryanleiker

iTrader: (2)

Could a cam or crank sensor cause it to react like vats?
I changed one thing in my tune and all of a sudden it won't continue to fire the injectors after the first combustion.

Peteydog1971

Thanks guys I took the ECM back to the shop they double checked and the vats was not deleted or deactivated. They reprogrammed and tested it. I installed it started right up. Thanks again guys for all your help.

81LS1Camaro

iTrader: (1)

Glad to hear you got it sorted out.