Zedyone_kenobi Posted January 29, 2012 Author Share #289 Posted January 29, 2012 Too soon to tell on AFR. But they look about the same. Maybe a bit better. It certainly idles better and starts better Link to comment Share on other sites More sharing options...
Bonzi Lon Posted January 29, 2012 Share #290 Posted January 29, 2012 I would like to know if the bead of grease trick around the throttle shafts I suggested had made any difference.Bonzi Lon Link to comment Share on other sites More sharing options...
Zedyone_kenobi Posted January 29, 2012 Author Share #291 Posted January 29, 2012 Drove the car more today. BIG improvement can be confirmed. Car feels great at any throttle position. At about 5000 rpm at part throttle it still had a popping but I could only get that to happen in second gear not first. If I was not so anal I could live with this just as it is because under normal driving it is butter smooth. It still leans out as rpm goes up with part throttle but not nearly as fast. There was no doubt a vacuum leak in that gasketNormal driving AFRs are about 13 :1 at steady throttle. I could probably run it richer and not worry about it but that is most likely masking the real problemI will drive it more and report back Link to comment Share on other sites More sharing options...
Zedyone_kenobi Posted January 29, 2012 Author Share #292 Posted January 29, 2012 Clarification, popping is definitely thereAgain only at part throttle. More evident rise in AFRs in 3rd at part throttle, and again in 4th. . Next step carb swap Link to comment Share on other sites More sharing options...
Diseazd Posted January 29, 2012 Share #293 Posted January 29, 2012 (edited) I'm betting it's electrical now.......plugs, points, condenser......maybe a bad plug wire.....I once had a similar problem with almost new plug wires. When I put a new distributor cap on there was a green electrical corrosion where the wire snapped into the cap. Edited January 29, 2012 by Diseazd Link to comment Share on other sites More sharing options...
Zedyone_kenobi Posted January 30, 2012 Author Share #294 Posted January 30, 2012 (edited) We took some shots at the electrical system. I bought new plugs and wires and installed and measured the resistance through all of them. I swapped out dizzy with a good pertronix and a coil with a known good car. I even replaced the balast resister even though it is bypassed. I ran a jumper from the battery to the coil to take the tach out of the picture. I swapped out a cap and rotor as well Edited January 30, 2012 by Zedyone_kenobi Link to comment Share on other sites More sharing options...
Zedyone_kenobi Posted January 30, 2012 Author Share #295 Posted January 30, 2012 So does anybody else think it could be valve seals leaking air into cylinder Link to comment Share on other sites More sharing options...
doradox Posted January 30, 2012 Share #296 Posted January 30, 2012 So does anybody else think it could be valve seals leaking air into cylinderThink about what might accompany that air if they were indeed leaking enough to make any kind of difference.Steve Link to comment Share on other sites More sharing options...
steve91tt Posted January 30, 2012 Share #297 Posted January 30, 2012 (edited) On a 40 year old motor, leaky valve seals are as common as wet tires in the rain. If leaky seals could cause the symptoms you describe this wouldn't be 12 page long thread. Edited January 30, 2012 by steve91tt Link to comment Share on other sites More sharing options...
Travel'n Man Posted January 30, 2012 Share #298 Posted January 30, 2012 What about your fuel return line? Are you running a return or is it deadheaded? Maybe if that were it the problem would be more consistent at all RPM's.........just thinking out loud. Link to comment Share on other sites More sharing options...
Travel'n Man Posted January 30, 2012 Share #299 Posted January 30, 2012 What was your AFR at WOT? Link to comment Share on other sites More sharing options...
Zedyone_kenobi Posted January 30, 2012 Author Share #300 Posted January 30, 2012 (edited) At WOT THe AFR stays around 12.9 to13.5Steve, Doradox, You guys are probably right. Those were the words of a desperate man talking...I have rulled out the 12V power side of the coil getting enough power with the jumper trick. However, I have not checked to see the quality of the coil ground. Although I think that would be just as evident at WOT as it is part throttle. Edited January 30, 2012 by Zedyone_kenobi Link to comment Share on other sites More sharing options...
Patcon
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