What would cause timing surges and no throttle response...

sb001

..besides a vacuum leak?
I have tried and tried to get my engine running right since I reinstalled it a few weeks ago, but something is really wrong. At idle speed it constantly surges up about 200-300 RPMs then drops back down, sometimes stalling out. Timing surges with it so it is impossible to set timing, and when I do keep it running and try to drive it there is just about zero throttle response when I hit the gas. Almost like the distributor is completely sticking.
I have tried to think of everything that could be causing this- as mentioned my first thought was a vacuum leak. I sprayed everywhere with carb cleaner, and even disconnected all autostick-related vacuum hoses from the system and plugged all open ports before trying to set timing again, but still same problems. The other reason I disconnected all the autsotick hoses was because when I remove the electrical lead to the AS control valve, idle (and timing) seemed to jump up and stabilize- but only for a minute or so, then it was back to the same issue.
The distributor was cleaned and bench tested when engine was rebuilt so I have trouble thinking that's it, but I'm running out of ideas. The only other thing I can even remotely think of that might cause something like this is the torque converter not being fully seated and affecting crankshaft spin or something weird like that. I've had a couple of local VW club guys look at it and they are as stumped as I am. Any help or ideas would be appreciated, as I am out of ideas. I have a video too that I'll post if I can get it converted to a format that the site will accept..
_________________
I'm the humblest guy on this board.

1969 autostick sedan, family owned since new
1600 SP engine
Solex 30 PICT 3 carburetor
Bosch 113905205AE autostick distributor

Hnoroian · Posted: Wed Sep 09, 2015 9:58 pm Post subject:

Restricting carbon built up in exhaust, or sticky Idle solenoid? Maybe your torkconverter is slipping some.
_________________
Stupid people do stupid things.

sb001 · Posted: Thu Sep 10, 2015 1:10 am Post subject:

morymob · Posted: Thu Sep 10, 2015 3:26 am Post subject:

Try another known good dizzy.

Kwig · Posted: Thu Sep 10, 2015 3:52 am Post subject:

Look down inside the carburetor and make sure the accelerator pump tube is still attached and pointing down the center. I was having the same problems that you described a few weeks ago, found the accelerator tube pushed against the side of the carburetor. After repositioning it the idle surging went away and throttle response was back to normal.

sb001 · Posted: Thu Sep 10, 2015 4:08 am Post subject:

Miklo · Posted: Thu Sep 10, 2015 6:47 am Post subject:

TheAmazingDave · Posted: Thu Sep 10, 2015 8:43 am Post subject:

If you're running points, try another condenser too, for shits 'n grins. I've seen some funky-running Bugs due to a condenser gone awry. One of them was "brand new" Chinese.
_________________
Just call me Big D. (formerly xBigDx408x)
TheAmazingDave.net
Deutschland Dubs 2015 at Presidio Trust

sb001 · Posted: Thu Sep 10, 2015 3:01 pm Post subject:

Mr.Duncan · Posted: Fri Sep 11, 2015 6:36 am Post subject:

johnnypan · Posted: Fri Sep 11, 2015 9:20 am Post subject:

or just turn the distributor rotor by hand and see if it snaps back..if it doesnt,then do above^^^

sb001 · Posted: Fri Sep 11, 2015 10:33 am Post subject:

sb001 · Posted: Fri Sep 11, 2015 6:07 pm Post subject:

OK, before I go any further taking this distributor apart, can someone tell me if this is normal:

Image may have been reduced in size. Click image to view fullscreen.

Lots of slop on the bottom dog drive, you can see it crooked, it can move up and down a bit as well as side to side, is that normal? When I push it upward then it seems to hold in place and I can't move it side to side anymore, but it sure seems to be loose and drop back down easily to the position it is in in the photo. Also there is no pin or anything in that hole (is there supposed to be?)

Thanks
_________________
I'm the humblest guy on this board.

1969 autostick sedan, family owned since new
1600 SP engine
Solex 30 PICT 3 carburetor
Bosch 113905205AE autostick distributor

sb001 · Posted: Fri Sep 11, 2015 6:21 pm Post subject:

Video:

Link

Notice that toward the end of the video I can push upward on the dog drive and it seems to lock into place (I can't wiggle it then.) But then I can pull it back down easily and it wiggles again.
_________________
I'm the humblest guy on this board.

1969 autostick sedan, family owned since new
1600 SP engine
Solex 30 PICT 3 carburetor
Bosch 113905205AE autostick distributor

Miklo · Posted: Sat Sep 12, 2015 8:18 am Post subject:

Have you had a chance to try this?

sb001 · Posted: Sat Sep 12, 2015 7:23 pm Post subject:

vamram · Posted: Sat Sep 12, 2015 7:50 pm Post subject:

johnnypan · Posted: Sat Sep 12, 2015 8:58 pm Post subject:

sb001 · Posted: Sat Sep 12, 2015 9:39 pm Post subject:

sb001 · Posted: Sat Sep 12, 2015 9:42 pm Post subject:


Hello! Log in or Register \| Help \| Donate \| Buy Shirts	See all banner ads \| Advertise on TheSamba.com

What would cause timing surges and no throttle response...
Page: 1, 2, 3 Next

Forum Index -> Beetle - Late Model/Super - 1968-up		Share:
		Print View

	Forum Index -> Beetle - Late Model/Super - 1968-up	All times are Mountain Standard Time/Pacific Daylight Savings Time Page: 1, 2, 3 Next
Page 1 of 3