Surging and backfiring—-runs very rough
- Eric Decetis
- 356 Fan
- Posts: 29
- Joined: Tue Jun 27, 2017 8:24 pm
Surging and backfiring—-runs very rough
Had my C car’s distributor rebuilt, engine timed and Weber carbs adjusted a week ago and car ran perfectly. Sat for a week and took it out yesterday; ran terribly. Surged and backfired dramatically. Ran very rough. Barely made it home after a few blocks. Your thoughts would be greatly appreciated as usual!
Eric
Eric
- Mike Wilson
- Classifieds Monitor
- Posts: 11633
- Joined: Tue Apr 15, 2008 4:37 pm
- Location: SW Los Angeles
Re: Surging and backfiring—-runs very rough
I'm pretty sure that the common consensus will be to start at square one with a full tune up. That way, you eliminate any variables, timing, etc. The problems you are experiencing could be electrical or fuel-related. It could be as simple as a loose coil wire or the distributor clamp not tight or...or...or...
Mike
Mike
Mike Wilson
Lomita, CA
'63 B coupe
Lomita, CA
'63 B coupe
- Eric Decetis
- 356 Fan
- Posts: 29
- Joined: Tue Jun 27, 2017 8:24 pm
Re: Surging and backfiring—-runs very rough
Great, thanks Mike!
- Mike Wilson
- Classifieds Monitor
- Posts: 11633
- Joined: Tue Apr 15, 2008 4:37 pm
- Location: SW Los Angeles
Re: Surging and backfiring—-runs very rough
Keep us posted, Eric.
Mike
Mike
Mike Wilson
Lomita, CA
'63 B coupe
Lomita, CA
'63 B coupe
- Mervyn Hyde
- 356 Fan
- Posts: 797
- Joined: Wed Nov 25, 2015 9:12 pm
- Location: Sunshine Coast Australia
Re: Surging and backfiring—-runs very rough
Eric, when the distributor was rebuilt, they probably fitted a shiny new condenser? If you still have the old one, just check that.
Merv
TYP356
1963 356B T6
1968 911 SWB
TYP356
1963 356B T6
1968 911 SWB
- Eric Decetis
- 356 Fan
- Posts: 29
- Joined: Tue Jun 27, 2017 8:24 pm
Re: Surging and backfiring—-runs very rough
Thank you, Merv! We used to old condenser. Hmmmm. Maybe a new one is in order? Than you, again!
- Jon Schmid
- 356 Fan
- Posts: 1800
- Joined: Thu Jun 26, 2008 4:32 pm
- Location: La Mirada, CA
Re: Surging and backfiring—-runs very rough
X2 on the condenser. If it's a Turkish made Bosch, X5. Don't ask me how I know.
- Eric Decetis
- 356 Fan
- Posts: 29
- Joined: Tue Jun 27, 2017 8:24 pm
Re: Surging and backfiring—-runs very rough
Jon! I was checking the condenser brand (it’s German) and I noticed that the condenser bracket was loose at the set screw. Very loose. I snugged it up very tight and the car runs fine! Could it have been something as simple as that???? Big thanks to you!
Eric
Eric
- Mike Wilson
- Classifieds Monitor
- Posts: 11633
- Joined: Tue Apr 15, 2008 4:37 pm
- Location: SW Los Angeles
Re: Surging and backfiring—-runs very rough
Success! [the sound of hands clapping!]
Mikr
Mikr
Mike Wilson
Lomita, CA
'63 B coupe
Lomita, CA
'63 B coupe
- Eric Decetis
- 356 Fan
- Posts: 29
- Joined: Tue Jun 27, 2017 8:24 pm
Re: Surging and backfiring—-runs very rough
Yes indeed, Mike! Thank you VERY much!!!!
Eric
Eric
- Jon Schmid
- 356 Fan
- Posts: 1800
- Joined: Thu Jun 26, 2008 4:32 pm
- Location: La Mirada, CA
Re: Surging and backfiring—-runs very rough
Eric, the blind squirrel (me) apparently found the acorn. All I know is that a lot of engine running issues seem to go back to cr@p Turkish made Bosch condensers. If this was just a loosely mounted German made unit, then I'm glad you checked it. I hope you fixed your problem for good, and you're most welcome.
- Eric Decetis
- 356 Fan
- Posts: 29
- Joined: Tue Jun 27, 2017 8:24 pm
Re: Surging and backfiring—-runs very rough
Thank you kindly, sir!
YOU were a great help.
Eric
YOU were a great help.
Eric
- Mervyn Hyde
- 356 Fan
- Posts: 797
- Joined: Wed Nov 25, 2015 9:12 pm
- Location: Sunshine Coast Australia
Re: Surging and backfiring—-runs very rough
Well done Eric. Keep that German condenser as long as it will work. They are the best. The symptoms your described did sound like a condenser issue.
Merv
TYP356
1963 356B T6
1968 911 SWB
TYP356
1963 356B T6
1968 911 SWB
- Eric Decetis
- 356 Fan
- Posts: 29
- Joined: Tue Jun 27, 2017 8:24 pm
Re: Surging and backfiring—-runs very rough
Thank you very much, Merv! I really appreciate your input!
Eric
Eric
-
- 356 Fan
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- Joined: Thu Feb 05, 2009 8:13 pm
- Location: Texas Panhandle South Plains
Re: Surging and backfiring—-runs very rough
Tim Berardelli told us on the 912 Registry BBS forum, to find a U.S. made "Standard brand GB 125" condenser, to carry for a spare, and it will, like the original German ones, likely outlast your ownership of the car.Jon Schmid wrote:Eric, the blind squirrel (me) apparently found the acorn. All I know is that a lot of engine running issues seem to go back to cr@p Turkish made Bosch condensers. If this was just a loosely mounted German made unit, then I'm glad you checked it. I hope you fixed your problem for good, and you're most welcome.
I found mine on Amazon. These come with the "horseshoe" shaped terminal, so if that hurts your conscience, swap it for the ring style terminal,
Heads up note: Be sure the condenser attaching screws (originally the shortest ones in the cast iron distributors) don't extend past the inner wall of the cast iron bowl, or aluminum, if you run an 031, or 061. I repaired one for a friend, in which the screw was too long, and it interfered with the outer return spring post, bending it. Adding washers under the screw heads, and straightening the posts, proved on the Sun machine, to have fixed it. Just sayin'...
Mike