Buick35 Posted February 2, 2020 Share Posted February 2, 2020 Hi,New to this forum but trying to help my son out. He has a nice 69 Ghia with a 1776? cc,mild cam,new coil and dist.and dual Kadrons.New gas tank. When cold especially it backfires and runs rough under power shooting flames out of the exhaust.What could be a possible cause? New intake gaskets also.Thanks,Greg. Link to comment Share on other sites More sharing options...
mike6024 Posted February 2, 2020 Share Posted February 2, 2020 way too rich or leaking carb diaphrams. are these new carbs? or rebuilt with all new seals, etc? I don't think I understand your question very well. I am only familiar with sidedraft weber or dellorto anyway. Link to comment Share on other sites More sharing options...
Buick35 Posted February 2, 2020 Author Share Posted February 2, 2020 Thanks,they are rebuilt with new seals.I also thought they were running too rich.Greg Link to comment Share on other sites More sharing options...
StillOutThere Posted February 4, 2020 Share Posted February 4, 2020 Are you using some sort of synchronization tool? Like a Uni-Sync ? Link to comment Share on other sites More sharing options...
Buick35 Posted February 6, 2020 Author Share Posted February 6, 2020 The vw shop we took it to did.I might have to bring it back to him. He replaced the distributor,coil,intake gaskets and cleaned the carbs. Link to comment Share on other sites More sharing options...
Buick35 Posted February 6, 2020 Author Share Posted February 6, 2020 I just had a thought. Sometimes it takes a little bit of jiggling of the ignition key to get it to turn over.Could a bad switch cause backfiring?Greg. Link to comment Share on other sites More sharing options...
hchris Posted February 6, 2020 Share Posted February 6, 2020 I'm a little confused, you say backfire out the exhaust? technically a backfire is through the carbs; afterfire is through the exhaust. Afterfire is pretty rare and is more likely to be a timing issue, wouldn't entirely discount carbs but more inclined to look at timing particularly when you mention cam,coil and distributor; assuming these have been newly installed ? Link to comment Share on other sites More sharing options...
mike6024 Posted February 6, 2020 Share Posted February 6, 2020 Timing is way off, or the carb mixture is way too rich. Timing off is much more likely. Timing is probably retarded, meaning it needs to be advanced. Get a timing light and check it yourself, don't take it back to the shop. Link to comment Share on other sites More sharing options...
Buick35 Posted February 6, 2020 Author Share Posted February 6, 2020 54 minutes ago, mike6024 said: Timing is way off, or the carb mixture is way too rich. Timing off is much more likely. Timing is probably retarded, meaning it needs to be advanced. Get a timing light and check it yourself, don't take it back to the shop. Thanks,Greg. Link to comment Share on other sites More sharing options...
Eric Wahlberg Posted February 14, 2020 Share Posted February 14, 2020 I had a '73 Porsche 914 that had dual Weber carbs that would occasionally pop and sputter. I found they would get dirt in the jets which caused this. A good cleaning helped as did installing a good fuel filter. Link to comment Share on other sites More sharing options...
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