put in new distributor, runs horrible
#1279571
08/04/12 11:41 PM
08/04/12 11:41 PM
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Joined: Feb 2007
Posts: 649 Davis, California, USA
MrBelvedere2
OP
mopar
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OP
mopar
Joined: Feb 2007
Posts: 649
Davis, California, USA
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I just put in a new stock replacement electronic distributor on my 383 in my 70 dodge truck that already had electronic ignition. The shaft was very sloppy on the old unit and was causing it to ping under load no matter what I would set it at timing wise. I put in the new unit, timed it in. It idles great, and runs great at higher RPM's. The thing is at above idle and cruise RPM, it backfires through the carb, and makes popping noises out of the exhaust. It bucks and pops, but does not die, like it is breaking up somehow in the mid RPM range. I only changed the distributor, so this is the only variable. Any advice? thanks!
1965 Plymouth Belvedere II hardtop
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Re: put in new distributor, runs horrible
[Re: MrBelvedere2]
#1279574
08/05/12 12:06 AM
08/05/12 12:06 AM
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Joined: Jul 2008
Posts: 259 Khemi, Stygia
Mebsuta
enthusiast
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enthusiast
Joined: Jul 2008
Posts: 259
Khemi, Stygia
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Does it have an adjustable vacuum advance? If it's bucking at cruise, sounds like too much vacuum advance. That's what mine does if I dial in too much.
Last edited by Mebsuta; 08/05/12 12:07 AM.
68 Roadrunner. 383 4-spd. Beat up.
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Re: put in new distributor, runs horrible
[Re: stumpy]
#1279576
08/05/12 02:38 AM
08/05/12 02:38 AM
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Joined: Mar 2003
Posts: 4,848 Memphis
HemiRick
master
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master
Joined: Mar 2003
Posts: 4,848
Memphis
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The pickups in the new MP distributors are crap. Swap out the pick up with your old one.
Take care, Rick 68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
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Re: put in new distributor, runs horrible
[Re: HemiRick]
#1279577
08/05/12 11:45 AM
08/05/12 11:45 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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X2: pickup gap/bad pickup/too much vac adv. I guess too much vac adv timing and or rotor phasing. I'd unplug/cap the vac adv hose (easy check) & see if that makes it better/worse/no change & vac adv also alters rotor phasing
live every 24 hour block of time like it's your last day on earth
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Re: put in new distributor, runs horrible
[Re: stumpy]
#1279579
08/05/12 01:21 PM
08/05/12 01:21 PM
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Joined: Mar 2008
Posts: 5,746 Ontario, Canada
Dodgem
master
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master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
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Quote:
Double check the plug wire firing order. It's easy to get two swapped.
And maybe it is over advancing is the vacuum hooked up and if it is to ported vacuum??
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Re: put in new distributor, runs horrible
[Re: Mr.Yuck]
#1279581
08/06/12 12:59 AM
08/06/12 12:59 AM
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Joined: Feb 2007
Posts: 649 Davis, California, USA
MrBelvedere2
OP
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OP
mopar
Joined: Feb 2007
Posts: 649
Davis, California, USA
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Ok I checked the gap, and it was .008 as it should be. It did turn out that the vacuum advance was way off, had to turn it clockwise with an allen wrench about 8 turns to get it to where it liked it. Runs great now. Thanks for all the help guys!
1965 Plymouth Belvedere II hardtop
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Re: put in new distributor, runs horrible
[Re: MrBelvedere2]
#1279582
08/06/12 08:57 PM
08/06/12 08:57 PM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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Quote:
had to turn it clockwise with an allen wrench about 8 turns to get it to where it liked it.
W H A T ???
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