Two other problems

[Peer81]

Hello everybody,

After getting the carb back together I did some testdrives last week.
I still have a problem I hoped I fixed by now but it's still there.
With the idle screw not thoughing the throttle blades she's running hot around 700 to 800 rpm (around 550 to 600 in drive). What I have read is that she shouldn't run if the idle screw is all the way out.
So started looking for a vacuum leak. With a vacuumgauge around 20hg at 700rpm I checked all the (new) vacuumhoses but no difference is found there. Found one carb bolt that was in the intake by 1 thread didn't work to placed a coil on the thread to fix that. Retorqued the carb bolts.
Till now I didn't check the intake for leaks still need to do that.
When the carb was apart I looked at the throttle blades and found holding them against the light alot of light was visible between the throttle blades and throttle bore.
Pictures:








So I repositioned the throttle blades to center them better in the bores.

I think it shoulc be a "big"? vacuumleak to cause this problem or am I wrong? Anybody a idea?

Second problem.
I rebuild the carb about a year ago. I also have a dual wideband meter to check the A/F ratio. At idle and normal steady drive the mixture is between 14:1 and 16:1 so not that bad. But at full throttle the mixture is steady around 9:1 so way rich! Weird thing, I still have a almost stock 350ci and the q-jet has the CH secondary rods. I didn't put in the DA rods (richer) to see the difference but it looks like I should go with a even leaner rod and not richer. Or could it be a problem in the carb like a blocked airbleed? Of course I compleetly cleaned the carb when I rebuild it.

Greetings Peter.

 

[Peer81]

In addition to the first...
Compleetly rebuild the E4ME carb. New secondary airvalve cam and the secondary airvalve spring is around 3/4 in. Lean and rich stops are good, dwell is around 30 degrees in drive. TPS at .56V.

The problem aren't the idle mixture screws but the screw to open the throttle blades a little and set idle.
Who has an idea? 

Greetings Peter

[Cliff Ruggles]

Make sure the linkage to the secondaries isn't holding them open slighlty.  Looks like a LOT of light showing thru around all 4 plates.  When indexing them and centering the shafts, make sure the link is NOT in place between the primary and seconadary shaft. 

It's not uncommon to have to "tweak" the shafts a bit for a perfect fit of the throttle plates.  There should be very little light showing around any of them, and equal amounts as well.....Cliff

[Peer81]

Hello Cliff,

Thanks for your reply. Could you explain to me what you mean with indexing and centering the throttle shafts? I looked in your book but couldn't find it. I did recenter the throttle blades so it looks alot better right now.

I'll check the the linkage!

Greetings Peter

[Cliff Ruggles]

The throttle plates should be fully seated in their bores and the center of the screw holes in the center of the holes in the plates when they are tightened up.

I use a screwdriver hanle to tap them in place, then gently tighten the screws.  Do the primary side first or leave the link off.

It's pretty common to have to work with them some to get them completely sealed off and equal on both sides.  Not uncommon for one or both shafts to be slightly twisted.  I've gotten pretty good at straightening them at this point.

In any case, do not attempt to place the throttle body in service unit all 4 plates are fully seated and showing very little light around them.......Cliff

[Peer81]

Thanks Cliff,

I'll try that! (when the snow has cleared).

Greetings Peter