Tom ark Posted July 18, 2020 Share Posted July 18, 2020 HI all, new member, but first older Dodge. I'm from Northern California. I have a 48 Dodge 4 door with fluid drive. We changed points, plugs, cap ,rotor ,new gas, wires ,coil, new vacuum advance, adjusted carb...,adjusted valves.. Just seems to flutter a bit at 20mph and then has good power up to almost 35/ 40. when the motor "can't go faster"... seems to be held back by something.. .doesn't stall, just poops out . The muffler doesn't sound plugged. There is spark, gas is flowing. any suggestion appreciated! Tomark Link to comment Share on other sites More sharing options...
Brooklyn Beer Posted July 18, 2020 Share Posted July 18, 2020 Have you checked compression in each cylinder? Vacuum ? Correct carb ? 1 Link to comment Share on other sites More sharing options...
Mattml430 Posted July 18, 2020 Share Posted July 18, 2020 Sounds like it’s starving for fuel. Try a separate small fuel tank and give it a run with that. Might be getting enough fuel idling and free reving it but not enough at 40mph. Old lines and tanks can have blockages. 3 Link to comment Share on other sites More sharing options...
Fossil Posted July 18, 2020 Share Posted July 18, 2020 Dirty fuel filter or weak fuel pump. Are you sure the throttle is opening all the way? If so it does sound like a restriction in the exhaust system. 1 Link to comment Share on other sites More sharing options...
Pete K. Posted July 19, 2020 Share Posted July 19, 2020 You adjusted the carb I see in post, but did you tear down carb to clean it out? Problem may be in float bowl or restriction in a jet. Sure sure sounds like fuel starvation. 3 Link to comment Share on other sites More sharing options...
Brooklyn Beer Posted July 19, 2020 Share Posted July 19, 2020 (edited) I am tracking down a some what similar issue and think mine is crap gas. I get fuel starvation at idle AND driving intermittently. Just cuts out and restarts though. (before rebuild and now) The carb rebuild is easy to do on these but still looking to get the dash pot dialed in. New fuel pump. I am going to hook up a satellite 1 gallon tank and by pass the fuel line to see if that stops it. Car sat for some time and the new gas I am sure is dissolving the old dried up varnish. This is the second filter in 2 months. Gas I just pulled out had turned an orangish yellowish nasty smelling liquid after adding some Berrymans to it in May. It starts easily, idles nicely, drives really good, then just cuts out. Sometimes it stalls, sometimes it drags way down. Has a pertronix swap. The crud that was in the carb looked like the Gowanus Canal at low tide. So am yanking the gas tank today to boil it out edit. yep, crud gas in the tank. Edited July 19, 2020 by Brooklyn Beer (see edit history) 2 Link to comment Share on other sites More sharing options...
Tom ark Posted July 23, 2020 Author Share Posted July 23, 2020 Thank you for the tips, Ill drop the exhaust to try that, but not not "noisy" Then check fuel pressure, and filter. satellite tank....we shall see. 1 Link to comment Share on other sites More sharing options...
Fossil Posted July 23, 2020 Share Posted July 23, 2020 1 hour ago, Tom ark said: Ill drop the exhaust to try that, but not not "noisy" Been my experience a restricted exhaust is quiet and if anything will make a sort of hissing sound. 1 Link to comment Share on other sites More sharing options...
Grimy Posted July 23, 2020 Share Posted July 23, 2020 Before you drop the exhaust to check for clog, try this: Car at rest with warmed up engine, attach a vacuum gauge. Have an assistant run the engine at 1500-1800 rpm as steadily as possible for two full minutes while you monitor the vacuum gauge. Gauge will settle within 15 seconds of this rpm--note the reading. If the gauge steadily drops during the second minute, you probably have clogged exhaust so go ahead and drop it. If there's no drop in vacuum, it's not the exhaust--and you've stayed cleaner. 3 1 Link to comment Share on other sites More sharing options...
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