Fuel Injection Wors

[riquemar]

Helping a friend out with a engine conversion (3.0 into a 75), and as I'm finishing up I seem to have run into a bit of a problem.

We've brought over the engine, CIS, and everything successfully. My problem is, that sometimes the car will and wont start, and I think I've narrowed it down to an FI issue. It seems like the only way I can get the car to start consistently is by pushing up on that sort of air plunger, located inside the Airbox behind the filter. Most of the time, the car will start for a short while (10-20 seconds) and then it will die out, also, it will be quite rough at times with back-fires and such.

On occasion, if I can keep the throttle going, I can have it running for up to 3-5 mins, but it again dies and is difficult to start.

So far, I've replaced the Cold Start Valve, the fuel filter, and cleaned the fuel distributor, but I'm seriously running out of options, and I want this thing running again!

[Flat6pac]

Did you see the 3.0 run before you brought it home?
Sounds like the plunger in the center of the fuel distributor isnt working smoothly. Remove the fuel distributor and blow out the center plunger and make sure there is no gas solids on it. Blow air through the distributor along with carb cleaner and get everything loosened up.
Might also check the flow pattern on the injectors at a diesel shop.
Bruce

[ossiblue]

Originally Posted by riquemar

Helping a friend out with a engine conversion (3.0 into a 75), and as I'm finishing up I seem to have run into a bit of a problem.

We've brought over the engine, CIS, and everything successfully. My problem is, that sometimes the car will and wont start, and I think I've narrowed it down to an FI issue. It seems like the only way I can get the car to start consistently is by pushing up on that sort of air plunger, located inside the Airbox behind the filter. Most of the time, the car will start for a short while (10-20 seconds) and then it will die out, also, it will be quite rough at times with back-fires and such.

On occasion, if I can keep the throttle going, I can have it running for up to 3-5 mins, but it again dies and is difficult to start.

So far, I've replaced the Cold Start Valve, the fuel filter, and cleaned the fuel distributor, but I'm seriously running out of options, and I want this thing running again!

What are your fuel pressures--system, cold control, warm control, and residual? If you haven't checked them, that is your first step. Loss of residual pressure can account for your need to lift the plunger. Too low system pressure can account for having to lift the plunger. Too high cold pressure could account for dying out/backfiring/rough running.

Start with the basics--check your pressures--and report the results.