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stumped!! #1605935 04/11/14 09:30 PM 04/11/14 09:30 PM
Joined: May 2010 Posts: 295 maryland B buck440 OP enthusiast
buck440 OP enthusiast B Joined: May 2010 Posts: 295 maryland	hi guy's recently rebuilt my buddys 440. basic rebuild with ported 516s 509 cam etc... we got it all together went to fire it off for cam break in and it runs for bout 5mins and dies like someone turn the switch off. wont restart unles it sits for a few mins. any ideas changed coil carb is good n cool full of fuel 7psi fuel pressure. could the msd be takin a dump?

Re: stumped!! [Re: buck440] #1605936 04/11/14 10:44 PM 04/11/14 10:44 PM
Joined: Sep 2006 Posts: 685 SW Ohio AAR-B4 mopar
AAR-B4 mopar Joined: Sep 2006 Posts: 685 SW Ohio	Distributor pick-up coil? Sounds like something electrical is getting hot. Good luck

Re: stumped!! [Re: buck440] #1605937 04/11/14 10:54 PM 04/11/14 10:54 PM
Joined: May 2006 Posts: 739 WA JD Dart super stock
JD Dart super stock Joined: May 2006 Posts: 739 WA	Ballast resistor

Re: stumped!! [Re: buck440] #1605938 04/12/14 08:42 AM 04/12/14 08:42 AM
Joined: Jan 2003 Posts: 10,002 Frostbitefalls MN (Rocky&Bullw... gregsdart I Live Here
gregsdart I Live Here Joined: Jan 2003 Posts: 10,002 Frostbitefalls MN (Rocky&Bullw...	If it is a stock early wiring harness, it could be the wiring at the firewall feed through. Run a hot wire directly to your ignition for test. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: stumped!! [Re: gregsdart] #1605939 04/12/14 05:14 PM 04/12/14 05:14 PM
Joined: May 2010 Posts: 295 maryland B buck440 OP enthusiast
buck440 OP enthusiast B Joined: May 2010 Posts: 295 maryland	ok guys update changed msd pickup cap rotor. started it ran for almost 4mins n shut down ? I believe its wired to the relay hot on the firewall or are you talkin bout the one to the ignition switch?

Re: stumped!! [Re: buck440] #1605940 04/12/14 05:39 PM 04/12/14 05:39 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: ok guys update changed msd pickup cap rotor. started it ran for almost 4mins n shut down ? I believe its wired to the relay hot on the firewall or are you talkin bout the one to the ignition switch? MSD says you should run the BIG red wire to the hot battery... but I've never had any issue doing it to the hot side of the relay... the small red goes to hot ignition.... BUT since your having a problem run a jumper from the hot battery to the big red just to eliminate any possible issues... I would think more like the dist pick up is bad.. so if you have another dist try it... your having a thermo issue on the electronics

Re: stumped!! [Re: MR_P_BODY] #1605941 04/12/14 05:50 PM 04/12/14 05:50 PM
Joined: May 2010 Posts: 295 maryland B buck440 OP enthusiast
buck440 OP enthusiast B Joined: May 2010 Posts: 295 maryland	that's what I was thinkin distrib. pick up was changed this morning does the msd 6al have thermal breakers in it? cause I give it five mins and bam it has fire again.

Re: stumped!! [Re: buck440] #1605942 04/12/14 06:01 PM 04/12/14 06:01 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: that's what I was thinkin distrib. pick up was changed this morning does the msd 6al have thermal breakers in it? cause I give it five mins and bam it has fire again. I dont know of any thermo switch in a 6al... you might need to measure the voltage going to the MSD as soon as it quits... both wires EDIT also check the ground when it quits Last edited by MR_P_BODY; 04/12/14 06:02 PM.

Re: stumped!! [Re: MR_P_BODY] #1605943 04/12/14 08:41 PM 04/12/14 08:41 PM
Joined: Jan 2003 Posts: 21,073 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,073 Niles , Ohio	My big red and black both go to the battery.Rocky Chrysler Firepower

Re: stumped!! [Re: therocks] #1605944 04/12/14 09:26 PM 04/12/14 09:26 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	So do mine. I think I used 12 gauge. Looking into my used MSD6 before I installed it I didn't see anything that looks like a circuit breaker. R.

Re: stumped!! [Re: dogdays] #1605945 04/13/14 01:48 AM 04/13/14 01:48 AM
Joined: May 2010 Posts: 295 maryland B buck440 OP enthusiast
buck440 OP enthusiast B Joined: May 2010 Posts: 295 maryland	update new msd box runs like a champ just hope all the startin n stopping. didn't mess the 509 break in up that n rings n bearings!!

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