Misfiring popping 392
#2836822
10/24/20 08:25 AM
10/24/20 08:25 AM
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Joined: Feb 2011
Posts: 211 Halifax, VA.
moparjack44
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1st Gen 392 / 2 - 500cfm Edelbrock(electric choke) / MSD ready run dist. / MSD Blaster 2 coil. I have replaced distrubutor cap, rotor, wires, coil, plugs. No change. Car starts fine, idles fine, but popping under light acceleration. ANY SUGGESTIONS? Jack
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Re: Misfiring popping 392
[Re: moparjack44]
#2836973
10/24/20 03:54 PM
10/24/20 03:54 PM
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Joined: May 2020
Posts: 29 CA
JWK57D100
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Have you checked the timing?
1957 D100
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Re: Misfiring popping 392
[Re: moparjack44]
#2837310
10/25/20 02:45 PM
10/25/20 02:45 PM
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Joined: Jan 2003
Posts: 25,786 Rio Linda, CA
John_Kunkel
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Put it on a scope and save lots of money over shotgunned parts.
The INTERNET, the MISinformation superhighway
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Re: Misfiring popping 392
[Re: poorboy]
#2837341
10/25/20 04:51 PM
10/25/20 04:51 PM
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Joined: Feb 2011
Posts: 211 Halifax, VA.
moparjack44
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A fresh build, or an original untouched motor? What have you done or checked, other then replacing tune up parts? Not much info. We will be guessing for months! Gene Probably 50000 miles. Running great when parked, about 2 days later this issue raised its ugly head. Tune up parts only. I have not checked timing, plan on getting to that tomorrow (Monday). Did adjust air fuel mixture, no help. Considering new distributor, but hoping the timing will help. Do not remember checking timing, ever. Replaced plugs and wires several times, just never checked/adjusted the timing...
K.I.S.S.
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Re: Misfiring popping 392
[Re: moparjack44]
#2837407
10/25/20 09:34 PM
10/25/20 09:34 PM
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Joined: Jan 2003
Posts: 10,558 Freeport IL USA
poorboy
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I Live Here
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A fresh build, or an original untouched motor? What have you done or checked, other then replacing tune up parts? Not much info. We will be guessing for months! Gene Probably 50000 miles. Running great when parked, about 2 days later this issue raised its ugly head. Tune up parts only. I have not checked timing, plan on getting to that tomorrow (Monday). Did adjust air fuel mixture, no help. Considering new distributor, but hoping the timing will help. Do not remember checking timing, ever. Replaced plugs and wires several times, just never checked/adjusted the timing... Pull the plugs and do a compression test. That may give you an idea if any one cylinder shows a problem. Is this a problem when the motor is cold, or is it always there? Gene
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Re: Misfiring popping 392
[Re: poorboy]
#2837507
10/26/20 10:40 AM
10/26/20 10:40 AM
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Joined: Feb 2011
Posts: 211 Halifax, VA.
moparjack44
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[quote=poorboy]A fresh build, or an original untouched motor? What have you done or checked, other then replacing tune up parts? Not much info. We will be guessing for months! Gene Probably 50000 miles. Running great when parked, about 2 days later this issue raised its ugly head. Tune up parts only. I have not checked timing, plan on getting to that tomorrow (Monday). Did adjust air fuel mixture, no help. Considering new distributor, but hoping the timing will help. Do not remember checking timing, ever. Replaced plugs and wires several times, just never checked/adjusted the timing... Pull the plugs and do a compression test. That may give you an idea if any one cylinder shows a problem. Is this a problem when the motor is cold, or is it always there? Gene [/quote Always. I forgot to mention, when I checked the plugs, they were smooted black and badly fouled. I replace the cap, rotor, and plugs. Started the engine, ran few minutes, still miss firing/popping. Checked plugs again, they were smooted and badly fouled just that quick?
K.I.S.S.
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Re: Misfiring popping 392
[Re: moparjack44]
#2837701
10/26/20 06:52 PM
10/26/20 06:52 PM
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Joined: Jan 2003
Posts: 10,558 Freeport IL USA
poorboy
I Live Here
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I Live Here
Joined: Jan 2003
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Freeport IL USA
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[quote=poorboy]A fresh build, or an original untouched motor? What have you done or checked, other then replacing tune up parts? Not much info. We will be guessing for months! Gene Probably 50000 miles. Running great when parked, about 2 days later this issue raised its ugly head. Tune up parts only. I have not checked timing, plan on getting to that tomorrow (Monday). Did adjust air fuel mixture, no help. Considering new distributor, but hoping the timing will help. Do not remember checking timing, ever. Replaced plugs and wires several times, just never checked/adjusted the timing... Pull the plugs and do a compression test. That may give you an idea if any one cylinder shows a problem. Is this a problem when the motor is cold, or is it always there? Gene [/quote Always. I forgot to mention, when I checked the plugs, they were smooted black and badly fouled. I replace the cap, rotor, and plugs. Started the engine, ran few minutes, still miss firing/popping. Checked plugs again, they were smooted and badly fouled just that quick? Does that "Always" mean you ran a compression test? What are the numbers? Plugs fouling that quickly can mean 2 things, lots of oil in the combustion chambers, or lots of gas in the combustion chambers. That much gas should give to a pretty strong gas smell, dies it smell like gas when you pull the plugs out? if it does, maybe one of your carbs is flooding the intake, could be a bad float, or something in the needle and seat. We are still guessing. Gene
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Re: Misfiring popping 392
[Re: poorboy]
#2838272
10/28/20 10:45 AM
10/28/20 10:45 AM
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Joined: Feb 2011
Posts: 211 Halifax, VA.
moparjack44
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Halifax, VA.
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[quote=poorboy]A fresh build, or an original untouched motor? What have you done or checked, other then replacing tune up parts? Not much info. We will be guessing for months! Gene Probably 50000 miles. Running great when parked, about 2 days later this issue raised its ugly head. Tune up parts only. I have not checked timing, plan on getting to that tomorrow (Monday). Did adjust air fuel mixture, no help. Considering new distributor, but hoping the timing will help. Do not remember checking timing, ever. Replaced plugs and wires several times, just never checked/adjusted the timing... Pull the plugs and do a compression test. That may give you an idea if any one cylinder shows a problem. Is this a problem when the motor is cold, or is it always there? Gene [/quote Always. I forgot to mention, when I checked the plugs, they were smooted black and badly fouled. I replace the cap, rotor, and plugs. Started the engine, ran few minutes, still miss firing/popping. Checked plugs again, they were smooted and badly fouled just that quick? Does that "Always" mean you ran a compression test? What are the numbers? Plugs fouling that quickly can mean 2 things, lots of oil in the combustion chambers, or lots of gas in the combustion chambers. That much gas should give to a pretty strong gas smell, dies it smell like gas when you pull the plugs out? if it does, maybe one of your carbs is flooding the intake, could be a bad float, or something in the needle and seat. We are still guessing. Gene Me too Gene. Have not done a compression check. For some reason (maybe because I'm on old rookie, not a seasoned mechanic), it never crossed my mind. I will see if I can get a loaner compression gauge from O'Reilly's? Had some friends (2 are seasoned mechanics) diagnosed, 98%, sure is distributor. After that, we drank some beers and swapped some lies. Ordered new distributor from Hot Heads. Gonna get the friends together again Thursday night to replace distributor, then drink some more cold beers and swap more lies Will get the real mechanic to bring compression gauge from his shop. Keep checking in, will continue to update as things happen. Thanks, Jack
K.I.S.S.
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Re: Misfiring popping 392
[Re: moparx]
#2840928
11/02/20 08:30 PM
11/02/20 08:30 PM
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Joined: Feb 2011
Posts: 211 Halifax, VA.
moparjack44
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glad to hear your problem is solved. any idea what was wrong with the old distributor ? Appears shorted out due to problem with cap?
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Re: Misfiring popping 392
[Re: moparx]
#2843923
11/09/20 11:15 AM
11/09/20 11:15 AM
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Joined: Feb 2011
Posts: 211 Halifax, VA.
moparjack44
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carbon tracking inside the cap possibly, or a cracked cap ? was this an old cap ? Yes. Probably 10 years old.
K.I.S.S.
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Re: Misfiring popping 392
[Re: poorboy]
#2843925
11/09/20 11:17 AM
11/09/20 11:17 AM
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Joined: Feb 2011
Posts: 211 Halifax, VA.
moparjack44
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I wish you the best of luck.
My mind isn't following how a messed up distributor will cause the quick plug fouling you described earlier unless the misfire you described was actually a barely running motor. There is a pretty big difference between a misfire and a motor you can barely keep running.
Inaccurate information ends up with inaccurate advice. Gene Car started great, idled great, ran great, but would skip and back fire under acceleration.
K.I.S.S.
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