FI enrichment effects on idle and vacuum.

[Dave WM]

those approaches look very easy, will give that a try before I disconnect all the fuel lines.

[Captain Obvious]

Dave, Yeah, it's not as bad as it sounds. You can get the whole rail off as a unit, and that will also give you the opportunity to take a look at your lower injector seals. If they're dried out and shrinked up, they might not be sealing well. And that certainly isn't going to help a lean misfire at idle when the vacuum is so high and the amount of fuel is so low.

Chas, Haha! That sure does look familiar! I don't remember, but I probably got the idea from seeing what you did! Out of curiosity, how did you get the injectors to fire?

[Zed Head]

I wired my injectors in series and used a car battery to just hold them open for a certain time.  Then set all of the bottles on a level surface for comparison.

[EuroDat]

4 hours ago, Captain Obvious said:

Chas, Haha! That sure does look familiar! I don't remember, but I probably got the idea from seeing what you did! Out of curiosity, how did you get the injectors to fire?

I first tried cranking, but it would take a long time to get any usable results, and even with the plugs out it would be hard on the starter/battery.

In the end I made a harness with some old connectors. 3 sets of two injectors in series so they would not be running at full battery voltage. Then two aligator clip on the battery. I still have the harness somewhere. Il take some photos of it and post them for reference.

Used a screwdriver through the aircleaner to activate the AFM flap and turned the ignition on to run the pump.

Edited August 30, 2017 by EuroDat

[Dave WM]

That's a nice setup ZH. Were you able to resolve the flow differences by some cleaning technique?

[Captain Obvious]

8 hours ago, EuroDat said:

I first tried cranking, but it would take a long time to get any usable results, and even with the plugs out it would be hard on the starter/battery.

Chas, That's  exactly what I did as well. I used the starter for about ten seconds and decided I needed to do something different. That's when I got the signal generator out and used it to drive a relay that pulled the lower side of the coil to ground. That way, I could also test the ignition system and verify the one injector opening for every three sparks, as well as vary the frequency. A little crude, but it worked.

I only mentioned the sig gen because I'm sure Dave has one. Probably vacuum tube, but I'm positive he's got one there somewhere.   

[Dave WM]

415 BK sweep gen with markers for IF AND color alignment

I wonder how they would like 44mhz!

Edited August 30, 2017 by Dave WM

[Captain Obvious]

Haha!! I'm disappointed! It's solid state and not tubes!!

Hope none of your neighbors are listening to the radio or they're gonna hear you testing your injectors.