305 tbi

[Nick_gt]

I have a 305 with tbi out of 87 chevy. I can get the truck to start, but it will only run for a few seconds, then it will die. Any ideas

[old school truck dude]

Might be runnin out of fuel, check the fuel pump pressure. With it just quittin like that, it should be fairly apparent what the problem is.. Its runnin out of fuel or spark, one of the 2..

[OLDBLUECHEVY]

hey yea if the fuel pump is loosing power it willl not provide enough pressure to run the engine some mid 90's had a VATS{ VECHICAL ANTI THEFT SYSTEM} set in the computer i just did a throttle body swap on oldblue and used a computer from a 90 and it did not have VATS.  if yours has VATS that is what is shuting down the truck you need to figure out y and fix it or eliminate it. if you have a chip on your ing key id check that first . if this dont help there could be a couple other reasons y but they are usualy a little more obvious than a vats problem like you could have a pluged fuel filter or a vaccume leak or the idle air control might be bad  the fuel pump should have about 17psi for a tbi engine  hope i could help

[Chevy Racer]

12 PSI will work.

[old school truck dude]

hey yea if the fuel pump is loosing power it willl not provide enough pressure to run the engine some mid 90's had a VATS{ VECHICAL ANTI THEFT SYSTEM} set in the computer i just did a throttle body swap on oldblue and used a computer from a 90 and it did not have VATS.  if yours has VATS that is what is shuting down the truck you need to figure out y and fix it or eliminate it. if you have a chip on your ing key id check that first . if this dont help there could be a couple other reasons y but they are usualy a little more obvious than a vats problem like you could have a pluged fuel filter or a vaccume leak or the idle air control might be bad  the fuel pump should have about 17psi for a tbi engine  hope i could help

Pretty sure it dont have anti-theft, its an 87

12 PSI will work.

yup, 9-13 lbs.. I used to use an old a/c guage on the fuel rail...

[Nick_gt]

I'll have to try that IAC. I have a in line fuel pump that will make up to 22. I just put a new fuel pressure regulator in the tbi. ( the rebuild kit came with two pins, but I didn't see any in the tbi went I took it apart.) I have good spark and it will stay running on carb cleaner, so I'm kinda thinking it needs injector because some times the fuel sprays in but also has a drip. This engine has the tbi swap on it ( everything from heads up)

[OLDBLUECHEVY]

yea i didnt see the year sorry for the unrelated crap

[old school truck dude]

I'll have to try that IAC. I have a in line fuel pump that will make up to 22. I just put a new fuel pressure regulator in the tbi. ( the rebuild kit came with two pins, but I didn't see any in the tbi went I took it apart.) I have good spark and it will stay running on carb cleaner, so I'm kinda thinking it needs injector because some times the fuel sprays in but also has a drip. This engine has the tbi swap on it ( everything from heads up)

Injector dripping means dirty/broke/leaking injector = flooding, computer compensates by leanin out mixture, and it dies...

[Nick_gt]

Good to know old school. Do the injector just pop out or twist out?

[old school truck dude]

Idk, have to go look at mine,

[Nick_gt]

Had some time to work on the truck today. I got a tbi rebuild  kit and cleaned it out really good. Injectors are spraying nicely now, and I put the thumper pump back on instead of the one that makes 9-22 psi. I think I have to get a inline fuel pressure regulator in order to run the higher volume pump. I think I might be have a bad coil, because the spark that the truck has, isn't very good. Does anyone know if a 220 tbi unit is considered a low pressure efi?