Mark Maras Posted October 1, 2018 Share #169 Posted October 1, 2018 @jalexquijano I'm proud of you. An improvement. Interesting that we're back to #4 looking worse than the rest. I think it may look a little better than before. Do you think that you could swap #4 plug wire with either #3 or #5, Length would be the only problem. Swapping #4 with another wire will allow us to see if the problem stays at #4 or goes to another cylinder with the wire. I'm interested in your thoughts on this. You're the one that improved the firing on #3 and #5 by (I'm assuming) checking and adjusting the connections. Can you think of anything specifically you did to improve it? Link to comment https://www.classiczcars.com/topic/60072-misfiring-while-cruising/?page=15#findComment-558560 Share on other sites More sharing options...
Johnny wick Posted October 1, 2018 Share #170 Posted October 1, 2018 24 minutes ago, Mark Maras said: @jalexquijano I'm proud of you. An improvement. Interesting that we're back to #4 looking worse than the rest. I think it may look a little better than before. Do you think that you could swap #4 plug wire with either #3 or #5, Length would be the only problem. Swapping #4 with another wire will allow us to see if the problem stays at #4 or goes to another cylinder with the wire. I'm interested in your thoughts on this. You're the one that improved the firing on #3 and #5 by (I'm assuming) checking and adjusting the connections. Can you think of anything specifically you did to improve it? I burshed the 6 plugs and took the car for a hard run on the highway. Parked the car and took 3 and 4 out. On 9/29/2018 at 8:43 AM, Mark Maras said: Ok, If you've completed all the tests and found everything looking good put it back together with good (or new) plugs and take it for a run and then let it idle. I'm hoping that you've improved the connections while doing the tests. Let u 1 Link to comment https://www.classiczcars.com/topic/60072-misfiring-while-cruising/?page=15#findComment-558561 Share on other sites More sharing options...
Patcon Posted October 1, 2018 Share #171 Posted October 1, 2018 Those look good. It's an idle issue apparently. I wonder if voltage at idle might be contributing to this. IE weaker spark due to starting with a lower voltage? This might also be due to a spotty wire or wire connection like Mark suspects. Would reducing the spark gap slightly be a bad idea? Less resistance to sparking that way... Link to comment https://www.classiczcars.com/topic/60072-misfiring-while-cruising/?page=15#findComment-558562 Share on other sites More sharing options...
rcb280z Posted October 1, 2018 Share #172 Posted October 1, 2018 Mark, can he run a hotter plug in those 2 cylinders? Will that help eliminate the idle fouling? Link to comment https://www.classiczcars.com/topic/60072-misfiring-while-cruising/?page=15#findComment-558563 Share on other sites More sharing options...
Mark Maras Posted October 1, 2018 Share #173 Posted October 1, 2018 27 minutes ago, rcb280z said: Mark, can he run a hotter plug in those 2 cylinders? Will that help eliminate the idle fouling? I think it might improve it but I doubt that it would be eliminated. There's still something wrong and we're getting closer to the cause, I think. 32 minutes ago, Patcon said: Those look good. It's an idle issue apparently. I wonder if voltage at idle might be contributing to this. IE weaker spark due to starting with a lower voltage? This might also be due to a spotty wire or wire connection like Mark suspects. Would reducing the spark gap slightly be a bad idea? Less resistance to sparking that way... Reducing the gap would certainly allow it to fire easier. One could combine both ideas (maybe) and buy a hotter plug and reduce the gap. Who knows, it just might work. BUT, my decades of shade tree mechanic work tell me this is a very simple problem (unless it's Pertronix related) and I refuse (at least for now) to give up. I have the same feeling about this problem as the previous SU problem. Simple problem, simple fix. @jalexquijano Have you tried swapping #4 wire with another next to it? After swapping the two wires, warm it up, take it for a fun drive, bring it home and let it idle for a while. Let it cool down and pull all the plugs. That should be the next test. We're getting closer to the problem.? 1 Link to comment https://www.classiczcars.com/topic/60072-misfiring-while-cruising/?page=15#findComment-558567 Share on other sites More sharing options...
Johnny wick Posted October 1, 2018 Share #174 Posted October 1, 2018 On 9/29/2018 at 8:43 AM, Mark Maras said: Ok, If you've completed all the tests and found everything looking good put it back together with good (or new) plugs and take it for a run and then let it idle. I'm hoping that you've improved the connections while doing the tests. Let us know. Im taking it for a test drive today and will leave it idling for 20 mins to simulate a traffic jam. Should i leav the timing at 14 btdc? 2 hours ago, Mark Maras said: I think it might improve it but I doubt that it would be eliminated. There's still something wrong and we're getting closer to the cause, I think. Reducing the gap would certainly allow it to fire easier. One could combine both ideas (maybe) and buy a hotter plug and reduce the gap. Who knows, it just might work. BUT, my decades of shade tree mechanic work tell me this is a very simple problem (unless it's Pertronix related) and I refuse (at least for now) to give up. I have the same feeling about this problem as the previous SU problem. Simple problem, simple fix. @jalexquijano Have you tried swapping #4 wire with another next to it? After swapping the two wires, warm it up, take it for a fun drive, bring it home and let it idle for a while. Let it cool down and pull all the plugs. That should be the next test. We're getting closer to the problem.? Ill swap the cables and test the car. Link to comment https://www.classiczcars.com/topic/60072-misfiring-while-cruising/?page=15#findComment-558577 Share on other sites More sharing options...
Mark Maras Posted October 1, 2018 Share #175 Posted October 1, 2018 Leave the timing at 14 btdc. Link to comment https://www.classiczcars.com/topic/60072-misfiring-while-cruising/?page=15#findComment-558582 Share on other sites More sharing options...
psdenno Posted October 1, 2018 Share #176 Posted October 1, 2018 (edited) 11 hours ago, jalexquijano said: Should i leav the timing at 14 btdc? Jalex, it might be worthwhile to go back through the entries in this thread and count the times people have told you NOT to change the timing until you determine if the cables are causing the problem. That's what troubleshooting is all about - eliminating possible causes one at a time without introducing new variables. Who's telling you to change the timing? Someone in a private message on this forum? Someone in Panama? A little voice in your head? I think you're testing the patience of those trying to help you and may be pushing the limit with many. Relax, follow the advice as given, or move on. It's as easy as that. Dennis Edited October 1, 2018 by psdenno 1 1 Link to comment https://www.classiczcars.com/topic/60072-misfiring-while-cruising/?page=15#findComment-558590 Share on other sites More sharing options...
Johnny wick Posted October 1, 2018 Share #177 Posted October 1, 2018 22 minutes ago, psdenno said: Jalex, it might be worthwhile to go back through the entries in this thread and count the times people have told you NOT to change the timing until you determine if the cables are causing the problem. That's what troubleshooting is all about - eliminating possible causes one at a time without introducing new variables. Who's telling you to change the timing? Someone in a private message on this forum? Someone in Panama? A little voice in your head? I think you're testing the patience of those trying to help you and may be pushing the limit with many. Relax, follow the advice as given, or move on. It's as easy as that. Dennis Sorry Denis. I will leave the timing as it is at 14 btdc. I raced the car last night and it accelerates fine. I hope you guys can help me solve this low rpm spark plug fouling. I should have never bought a car that had an engine remanufactured and modified by californa datsun. I should have bought a stock engine. 1 Link to comment https://www.classiczcars.com/topic/60072-misfiring-while-cruising/?page=15#findComment-558591 Share on other sites More sharing options...
Mark Maras Posted October 1, 2018 Share #178 Posted October 1, 2018 Although I agree that the timing shouldn't be changed at this time, I doubt that retarding the timing back to 12 btdc would change anything unless a bad connection was bumped and improved. Link to comment https://www.classiczcars.com/topic/60072-misfiring-while-cruising/?page=15#findComment-558594 Share on other sites More sharing options...
Johnny wick Posted October 1, 2018 Share #179 Posted October 1, 2018 Do you think i should open the distributor? Any symptom of frozen wieght? I really dont think so! Link to comment https://www.classiczcars.com/topic/60072-misfiring-while-cruising/?page=15#findComment-558612 Share on other sites More sharing options...
Mark Maras Posted October 2, 2018 Share #180 Posted October 2, 2018 I don't think so either based on your reports of the engine pulling strong. Link to comment https://www.classiczcars.com/topic/60072-misfiring-while-cruising/?page=15#findComment-558632 Share on other sites More sharing options...
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