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Re: Car popping at 40-50 mph? What can it be?
[Re: Golden-Arm]
#1106116
11/02/11 08:43 PM
11/02/11 08:43 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
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Florida
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mine does that when it needs a set of points and condencer.  also did it with a vac leak  did it when the timeing was to far advanced till I got a light on it to dial it back in(set by ear..yea right!) are you sure a wire is not crossed 
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Re: Car popping at 40-50 mph? What can it be?
[Re: scratchnfotraction]
#1106120
11/02/11 09:28 PM
11/02/11 09:28 PM
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Joined: Aug 2010
Posts: 185
east bay ca
torqueaddict
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Quote:
mine does that when it needs a set of points and condencer.
also did it with a vac leak
did it when the timeing was to far advanced till I got a light on it to dial it back in(set by ear..yea right!)
are you sure a wire is not crossed
Could be a crossed spark plug wire although they did check it a few times. I dont think points are the issue I have an electronic ignition set up. The vac leak seems like serious possibility how can I fix that?
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Re: Car popping at 40-50 mph? What can it be?
[Re: torqueaddict]
#1106121
11/02/11 09:29 PM
11/02/11 09:29 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
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I Live Here
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if the vac pod on dist is ruptured,then yes it could be distributor related. most vac leaks are carb/intake related. check along intake/heads/carb base with an unlight propane torch while engine idles..if idle goes up you have found the vac leak. dizzy = distibutor dizzy cap is the dist cap bad fuel pump = less fuel = going lean and poping is it poping in the exhast or back up thru the carb? 
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Re: Car popping at 40-50 mph? What can it be?
[Re: GMP440]
#1106122
11/02/11 09:40 PM
11/02/11 09:40 PM
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Joined: Aug 2010
Posts: 185
east bay ca
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Quote:
How old are the spark plugs? Check that the internal electrode is still intact. Experienced this with my neighbor's tree chipper. He could not figure why it could not start. I checked the spark plug with an ohm meter and found that the electrode inside the porcelain jacket was broken inside. Replaced the plug and got the chipper running again.
The plugs are new, less than 1k on them. And the car turns over regularly.
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Re: Car popping at 40-50 mph? What can it be?
[Re: dOc !]
#1106123
11/02/11 09:42 PM
11/02/11 09:42 PM
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Joined: Aug 2010
Posts: 185
east bay ca
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Quote:
Is this at a lite-cruise .....half throttle ...WOT ? ...
Not even half throttle, I can be barely tapping the gas if I am at that speed level it does that.
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Re: Car popping at 40-50 mph? What can it be?
[Re: torqueaddict]
#1106124
11/02/11 10:04 PM
11/02/11 10:04 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
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Lincoln Nebraska
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(much) more info: what year/eng/ecu/dizzy  /timing (initial/total)/carb floats/jets etc in the ballpark. You said always done it? popping? (a very quick missing/hesitation) out the carb or tailpipe(s)? tapping the gas?? you mean gooseing it a bit? Always does it & how much throttle depression (vac level) would you estimate when it acts up
live every 24 hour block of time like it's your last day on earth
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Re: Car popping at 40-50 mph? What can it be?
[Re: RapidRobert]
#1106125
11/02/11 10:22 PM
11/02/11 10:22 PM
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Joined: Aug 2010
Posts: 185
east bay ca
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Quote:
(much) more info: what year/eng/ecu/dizzy /timing (initial/total)/carb floats/jets etc in the ballpark. You said always done it? popping? (a very quick missing/hesitation) out the carb or tailpipe(s)? tapping the gas?? you mean gooseing it a bit? Always does it & how much throttle depression (vac level) would you estimate when it acts up
The block is a 69 383 from a charger, I dont know about the internals other than it has a forged crank and the bottom end has less than 2k miles on it. The timing I am not sure of either but I know it has been adjusted numerous times and still pops. And it does hesitate at times but the popping or backfiring is my primary concern, it comes out the tailpipe. When I excel to a certain rpm and my speed is in the cruising range 40-50 mph it backfires when I stop pressing the gas. The more I accelerate the worse it becomes, until it pops as I actually hitting the gas. I dont know what goosing is, and am not sure about the throttle pressure. I am sorry I am not more knowledgeable, I really do wanna learn more I have not been at this that long and in California not many people still have mopar, and they act as if its a totally different car to fix issues like this. Any advice and or info you guys can provide for help I really do appreciate.
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Re: Car popping at 40-50 mph? What can it be?
[Re: RapidRobert]
#1106126
11/02/11 10:26 PM
11/02/11 10:26 PM
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Joined: Aug 2010
Posts: 185
east bay ca
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Quote:
(much) more info: what year/eng/ecu/dizzy /timing (initial/total)/carb floats/jets etc in the ballpark. You said always done it? popping? (a very quick missing/hesitation) out the carb or tailpipe(s)? tapping the gas?? you mean gooseing it a bit? Always does it & how much throttle depression (vac level) would you estimate when it acts up
Just read the one about what a dizzy is its a mopar brand electronic distributer and box. I got them in a kit from summit.
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Re: Car popping at 40-50 mph? What can it be?
[Re: torqueaddict]
#1106127
11/02/11 10:40 PM
11/02/11 10:40 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
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Lincoln Nebraska
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You're doing great. Goosing it I just meant jabbing the pedal referring back to when you mentioned tapping the pedal. Can you disconnect the line from the dist vac adv canister and plug it with a golf tee (or similar) & retry it (rotor phasing issue) and see if it gets better/worse/same then plug it back in. Can you check that the dist pickup gap is .008" with a brass feeler gauge and on the top of the metal dist housing make a mark on the metal housing perimeter edge where the rounded cap vertical bulge column for #1 plug wire is (if that makes sense) in other words where is the exact clocking of the cap brass terminal then take off the cap and twist the rotor CW & see if the tip of the rotor blade is very close to the mark you made (rotor phasing) EDIT (re)read your post & the box wouldn't happen to be orange would it
Last edited by RapidRobert; 11/02/11 10:42 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Car popping at 40-50 mph? What can it be?
[Re: torqueaddict]
#1106128
11/02/11 10:54 PM
11/02/11 10:54 PM
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Joined: Jul 2008
Posts: 30,469
Florida STAYcation
dOc !
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The village idiot's idiot
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Florida STAYcation
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Quote:
Quote:
Is this at a lite-cruise .....half throttle ...WOT ? ...
Not even half throttle, I can be barely tapping the gas if I am at that speed level it does that.
So at WOT it is OK ? ... I would say it is way-LEAN ...
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Re: Car popping at 40-50 mph? What can it be?
[Re: RapidRobert]
#1106129
11/02/11 10:59 PM
11/02/11 10:59 PM
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Joined: Aug 2010
Posts: 185
east bay ca
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Quote:
You're doing great. Goosing it I just meant jabbing the pedal referring back to when you mentioned tapping the pedal. Can you disconnect the line from the dist vac adv canister and plug it with a golf tee (or similar) & retry it (rotor phasing issue) and see if it gets better/worse/same then plug it back in. Can you check that the dist pickup gap is .008" with a brass feeler gauge and on the top of the metal dist housing make a mark on the metal housing perimeter edge where the rounded cap vertical bulge column for #1 plug wire is (if that makes sense) in other words where is the exact clocking of the cap brass terminal then take off the cap and twist the rotor CW & see if the tip of the rotor blade is very close to the mark you made (rotor phasing) EDIT (re)read your post & the box wouldn't happen to be orange would it
Ok that sounds like a few hours worth of work. The vacuum advance canister is that metal thing below the distributer cap right? I may have to wait till I get off early or am off to do that stuff (I work alot of hours). And yes I have the orange mopar box, someone told me that one is the wromg one for me.
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Re: Car popping at 40-50 mph? What can it be?
[Re: dOc !]
#1106130
11/02/11 11:03 PM
11/02/11 11:03 PM
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Joined: Aug 2010
Posts: 185
east bay ca
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Quote:
Quote:
Quote:
Is this at a lite-cruise .....half throttle ...WOT ? ...
Not even half throttle, I can be barely tapping the gas if I am at that speed level it does that.
So at WOT it is OK ? ... I would say it is way-LEAN ...
I am sorry what is WOT? I wasnt sure that why I didnt answer at first.
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Re: Car popping at 40-50 mph? What can it be?
[Re: dOc !]
#1106133
11/02/11 11:10 PM
11/02/11 11:10 PM
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Joined: Aug 2010
Posts: 185
east bay ca
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Quote:
wide-open-throttle ..
Oh my bad, nope at wot it hesitates and if I get to certain speed like 55 60 mph it backfires while on the throttle.
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