TBI rebuild

[JPVortex]

There has to be "something" for the spring to seat against. There's the stamped-sheetmetal spring seat like you've got pictured.

There's also a cast-zinc version. There may be other kinds as well.

You must be registered for see images attach

You must be registered for see images attach

Thank you. I’m going to continue work on this tbi unit tomorrow, I think the problem lies in the regulator

 

[JPVortex]

I still think you need to connect a scan tool and verify all the sensors and computer outputs.

Wouldn't hurt to check the usual "tune-up" items--distributor cap, rotor, plug wire, plugs, initial timing, PCV system operation, fuel filter, fuel pressure, etc.

Definitely should, I’m looking into getting a ALDL to USB for tunerprort for live data

 

[JPVortex]

are the injectors from the original TBI? have you checked fuel pressure?

Injectors are not original, and have a good cone spray. Fuel pressure should be fine, as before I rebuilt this tbi literally 2 days ago it ran, and the pump is less than 6 months old.

 

[JPVortex]

There has to be "something" for the spring to seat against. There's the stamped-sheetmetal spring seat like you've got pictured.

There's also a cast-zinc version. There may be other kinds as well.

You must be registered for see images attach

You must be registered for see images attach

Also the regulator I have in it now may not have a seat at all, there was nothing in there. I just put the spring inside of it with the set screw. That may be my problem…. I’m going to put the stamped steel seat regulator in tomorrow.

 

[tayto]

this is why i asked about fuel pressure, if the stackup is wrong in the regulator it could result in too high or too low pressure

 

[Scooterwrench]

Here’s a good picture of the circle piece I’m talking about

You must be registered for see images attach

You must be registered for see images attach

Without that spring seat in there your fuel pressure is going to be way low. Use the spring and housing that went with that seat and you should be close to correct pressure. Pressure testing after rebuilding the injector pod is crucial. TunerPro can't read fuel pressure,you will have to do that with a mechanical gauge.

 

[Scooterwrench]

There has to be "something" for the spring to seat against. There's the stamped-sheetmetal spring seat like you've got pictured.

There's also a cast-zinc version. There may be other kinds as well.

You must be registered for see images attach

You must be registered for see images attach

Hey shurk,
Did you push up the bottom of that spring housing to raise the pressure adjustment range?

 

[PlayingWithTBI]

I’m looking into getting a ALDL to USB for tunerprort for live data

Here's what I use, there's a jumper for shorting wire A&B, also a 10K Ohm resistor for older and TPI.

www.aldlcable.com/

OBD Diagnostics

aldlcable.com

 

[JPVortex]

Hey guys, it’s all fixed now the mismatching regulator cap with the spring was the problem and it wasn’t getting enough fuel to consistently run because of it! Matched up the cap and spring and she runs like a gem.

 

[Schurkey]

Hey shurk,
Did you push up the bottom of that spring housing to raise the pressure adjustment range?

The regulator with the cast-zinc piece is destroyed, visible in the photos above, and another below. The bottom broke out of it when I tried to make it "adjustable".

You must be registered for see images attach

I wrecked another one, different style, also trying to make it "adjustable".

In the end, I stretched the spring, and put a washer or three on the spring seat to jack the pressure up a bit. Not adjustable, but pressure increased.