Carb issues take two, Idle still dropping off Dual IDF 40s Options

[VaccaRabite]

If you remember from my last thread, I have started having an issue where my idle was dropping from 1100 to ~500 and the engine would sputter. I thought it was due to clogged idle jets.

Well, Friday I cleaned the dickens out of my idle circuits and set idle back to 1100. Yesterday (saturday) I drove the 914 70 miles to Plaskets' summer BBQ. The car did great until I got to within a few miles of Plaskets, with the idle falling off again. ScottyB and I tinkered with it for a while - checking timing and trying to figure out what the hell was going on.

What we found was that the drivers side bank of carbs was dropping out, possibly due to the idle stop backing off. But the carbs were just being wonky. We ended up not really fixing anything. I set idle back to 1100 and headed for home. the 70 mile trip was more or less uneventful until I for a mile or so away from my house. Stopped at a light and almost home, I could feel a cylinder drop off. The idle dropped down to about 1000 rpm and the idle became just a little lumpy. When I got home, I was back to idling on 2 cylinders at 500rpm and the car was sputtering in my driveway while I waited for the garage door to open. I had to keep blipping the throttle to keep it alive.

The thing is, as son as you give the car gas, all four cylinders fire up and the car is a blast to drive. Its just back down to idle where I have issues.

I am at the point where I am going to unhook the linkage and start from scratch to rebalance everything, and hope that fixes it.

If anyone has other ideas as to what is going on I'd love to hear them!

Zach

[brant]

I sometimes have the same issue when hot. I can't wait until you solve this for me......

I've balanced the carbs with linkage attatched.
what is the full rebalance procedural steps with the linkage unattatched (that you are going to do)
?

tia
brant

[VaccaRabite]

I sometimes have the same issue when hot. I can't wait until you solve this for me......
I've balanced the carbs with linkage attatched.
what is the full rebalance procedural steps with the linkage unattatched (that you are going to do)
?

(IMG:style_emoticons/default/laugh.gif)

When I do a full balance, I start with one end of the linkage unhooked and set my carbs idle only with the idle stops. Fully wamred up, etc, I can set my idle where I need it to be to have all the carbs drawing the same. Then I can fiddle with the mix screws to get them perfect. Then fiddle with the air correction screws (if needed) to get all four barrels exactly the same.

When all that is perfect, ten I hook up the linkage. the idea will be to have the arms set to not be pushing against the idle stops, but be right on them. Then you try to adjust so that idle does not change but the carbs are still balanced at WOT.

So, I am starting over from scratch. Hopefully this works.

Everyhting was running great earlier this summer before I went up from 55 to 60 idle jets. (IMG:style_emoticons/default/dry.gif) Maybe I'll set them back down to 55s again when I reset.

Zach