IDA3C Weber Troubleshooting Options

[Cfletch]

Here is a general update for this post. The carbs are more or less fine and I will do my fine tuning another day.

After getting my fuel pressure regulated, blasting everything once again with comp air, and setting my floats, I was still having all kinds of weird issues. Constant backfires from both ends at similar times, hanging idle, inconsistent idle, no real change in idle when adjusting idle mixture screws, you name it, I had it. The hanging idle really got me thinking that my issues couldn't be the carbs. I didn't have a vac leak and when the car started it idled just fine where I had set it. If I gave it some throttle, it would essentially stay at 2k RPM and would refuse to go down. Thinking it was maybe my throttle linkage or plates not closing I checked all the suspects there to no avail. I then decided to get my timing light out to confirm my timing once again. I hooked it up, started the car, idled just fine and the timing looked good. Gave it some gas while looking, and it was bouncing around erratically as well as getting hung up in high spots on advance. My issue was solve. It was a worn distributor essentially giving me all of this headache. In my head, my whole focus was on these carbs. I got them as cores from someones garage for cheap and never really rebuilt these style carbs in the past so I was confident it was a me/carb issue.

I pulled the distributor after setting car to TDC @ #1 and then took it to my bench thinking maybe the mechanism just needed to get oiled up since the engine sat outside covered for about 10 years prior to me finally working on the project. Nope, clean as a whistle. My issue was that the top part of the shaft, where the advance and points plates are had a ton of play, very excessive and that caused an issue with the advance plate getting wedged in weird locations. I pulled out the felt pad inside the shaft hole on the distributor and saw the retaining circlip just loose in there. No wonder I had all that play, I oiled it up, put the clip back on the shaft and my play went away. Installed the distributor again and started it up and..... no spark what so ever. Nothing. Confused I set it back to TDC and pulled it again. All of my play in the shaft was back? I checked the circlip again and it was in there again. After getting really frustrated with the distributor and looking at the prices of recurves for my engine since it was once CIS and what not I decided screw it, I'll get a 123.

Ordered it from PMB, it got shipped same day, got it the day I left for car week. Had some fun at the track and the Werks Reunion and then got back home on Sunday to install it. Got it installed, found a tune online that works well for my engine and the car now runs pretty good. No hang ups, no weird surges, full range of RPM, and no crazy amounts of backfires through carbs and exhaust.

Last thing I will need to do is take my snail on the weekend and do some fine tuning to the carbs which I think I shouldn't have much problem with now.

Thanks for everyones input here, wish I spent a second thinking about timing, but at least now my engine runs well!

[930cabman]

all is well that ends well, glad you got her running "smooth"

was it the distr the entire time or a combination of carb/distr?

[Cfletch]

all is well that ends well, glad you got her running "smooth"

was it the distr the entire time or a combination of carb/distr?

I would say it was a combo which is why I was chasing my tail. I always kind of noticed that the rotor would be a little wonky when popping it onto the shaft and I just never thought much of it. The carbs for sure at a point because It was not regulated down to 3.5lbs and the pump although saying it was a 3.5lb pump, was giving 12lbs. I swapped pumps to a rotary w/ internal regulator and that fixed a lot of problems right away with just dumping fuel.

[IronHillRestorations]

You’re heading in the right direction.

[930cabman]

You’re heading in the right direction.

My experience tells me Webers DO NOT like any fuel pressure over 3.5

I run about 2 - 2.5 and have never run out of fuel, but I do not track the 2056