Tag injection pump

Alright, let’s dig into that cold start issue on your 1983 F350 with the 6.9 IDI. You’ve done a lot already, so let’s focus on a few areas that might still be causing trouble.

Glow Plug System

1. Glow Plugs: Make sure they’re all functioning. If even one is dead, it can cause hard starts. Test them with a multimeter: they should show low resistance. Replace any faulty ones with quality plugs like Motorcraft or Beru.

2. Glow Plug Relay: Check if the relay is clicking on and off as it should. If it’s not functioning, the plugs won’t heat properly.

3. Controller: The glow plug controller can sometimes be the culprit. Verify that it’s sending power to the glow plugs for the correct duration.

Fuel Delivery

1. Air Leaks: Double-check for any air leaks in the fuel lines, especially since you’ve replaced them. Air in the system can lead to starting issues.

2. Fuel Pump Pressure: Since you’ve switched to an electric fuel pump, confirm it’s delivering the correct pressure (around 4-6 PSI for the 6.9 IDI).

Engine Timing

1. Injection Timing: If the timing is off, it can lead to hard starts and excessive smoke. Ensure the injection pump is correctly timed. A slight advance or retardation can make a big difference.

Electrical System

1. Battery and Cables: Ensure the batteries are strong and the cables are clean and tight. The starter needs a good supply to crank effectively, especially in cold weather.

Other Tips

• Block Heater: Using a block heater in colder weather can make a big difference. If you don’t have one, consider adding it.

• Ether Use: Avoid using ether regularly, especially if your glow plugs are active—it can cause damage.

Final Thoughts

If you’ve covered all these and still face issues, there may be a deeper problem, like compression loss, which would require further inspection.

Remember, the Bullnose Ford subreddit (reddit.com/r/bullnoseford) is also a great place to connect with others who might have faced similar issues. Keep at it—you’re on the right track!