Jump to content

IGNORED

FI enrichment effects on idle and vacuum.


Dave WM

Recommended Posts

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?

Link to comment
Share on other sites


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 by EuroDat
Link to comment
Share on other sites

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.   :)

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...

Important Information

By using this site, you agree to our Privacy Policy and Guidelines. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.