1600DP hesitation and misfiring

[BigMcLargeHuge]

Hello all, I've been trying to sort out a hesitation and misfire issue in my '67 and haven't had much success. It has a 1600DP motor, with a 34PICT carb and 009 distributor with Pertronix ignition. At very light load, it seems to rev up just fine. When I get on the gas, it stumbles and misses. This started happening occasionally, and has gotten more and more pronounced.

I've owned this car for just a few months, and it's my first aircooled, so I'm not super familiar with these motors just yet. I've replaced the fuel filter (old one didn't look too bad, but figured it was a good place to start), checked all the ignition wires, drained a bit of fuel from the carb bowl to see if there was contamination. Everything there looks pretty good to me. I've also been running it only on ethanol-free fuel. I've checked the adjustment of the accelerator pump and it appears to be set up properly. With the air cleaner removed, you can hear and see it operate as you move the throttle linkage, though I haven't taken any of that stuff apart to measure fuel quantity.

It idles fine when started but after the stumble it will sometimes stall out when returning to idle. Seems like the problem starts at about 1/4 to 1/3 throttle. Any idea what could be happening here? I'd like to get her running properly for when we have friends in town next weekend!

Thanks in advance for any help or ideas!

[Cusser]

[wcfvw69]

Your fix is a different distributor. What 34-3 is on it? Is it an original German Solex 34-3 or an aftermarket? Your two choices are an original Bosch 034 SVDA or an original DVDA Bosch distributor. What carb brand you have matters as they need to match either of those distributors.

DON'T waste your money buying any "new" SVDA as they are all poor quality Chinese copies. These threads are clogged regularly with people struggling with them.

Myself and others sell restored original Bosch distributors that will make your engine purr again.

If your carb is an original German Solex, it will have a "base flange number" stamped on the bottom of it or the back. Let us know the number is it is an original Solex.
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[BigMcLargeHuge]

I'm no expert, but I'd definitely say it's aftermarket. Looks much too new to be OE. There's a little metal tag attached at the top of the float chamber that says 113 129 031K, but that doesn't seem to narrow manufacturer down at all. There is no manufacturer branding anywhere that I can find.

[BigMcLargeHuge]

Here's a photo, for what it's worth...

http://imgur.com/YtD89FF

Looks like a generic cheapie to me, but it was installed before I bought the car so no telling. The distributor on the car has a Bosch logo.

[67rustavenger]

It's a euromax carb. The name is on the float bowl facing the fan shroud.
Like Dan said. get a good dist that matches your carb. Or get a rebuilt carb and dist from a known good restorer.

The 009 even if it is a Bosch still won't play well with that carb. I have a Bosch 009 and it won't work on my spare engine with a Bocar 34 PICT 3.

Good Luck.
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[wcfvw69]

[BigMcLargeHuge]

The goal for the car is to be a fun driver, not necessarily to win Pebble Beach or anything. But at the same time, I don't want a cobbled-together bucket.

I'd rather not replace the carburetor if it's not necessary. I'm wondering if the temperature rise over the last couple of months has made the hesitation and misfire more and more noticeable. I've put 500 miles on the car before this issue became persistent. The first 400 miles or so, the hesitation did not occur at all, but those were in the cooler months of March and April. In May, it started happening more and more often. First I attributed it to a bad tank of fuel, but that's clearly not the case.

My only concern in going to the original 034 distributor is losing the electronic ignition. I've never owned anything with points (only old diesels and newer FI gassers) and all I know about them is that they can be a pain to keep working properly. Clearly, I need to swap out the distributor to something with a proper advance mechanism.

Thanks to all for the help so far, it's much appreciated and I'm learning a lot. I kept thinking I had a fuel issue on my hands, but incorrect spark advance makes a lot of sense.

[67rustavenger]

So find a reconditioned Bosch 034 and put the Petronics ignition in it.
Done deal!
But carry your old 009 with points and condenser ready for plug and play in the trunk of your car for when the electronics take a shit far from home.

Good Luck.
_________________
I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!

There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo!

[wcfvw69]