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MSD 6AL problem #1244183 06/02/12 06:02 PM 06/02/12 06:02 PM
Joined: Jan 2003 Posts: 332 14437 H HOTHEMI OP enthusiast
HOTHEMI OP enthusiast H Joined: Jan 2003 Posts: 332 14437	I have an MSD 6AL with a race mechanical advance MP distributor and Accel coil in my Challenger street car. It has a 426 Hemi , everything basic checks out fine but has developed a misfire that I can't pinpoint, do the MSDs have any issues like this or do they just die completely ? This setup has run flawless for me for better than 15 years . Don't just want to start replacing expensive parts for no reason. Thanks

Re: MSD 6AL problem [Re: HOTHEMI] #1244184 06/02/12 06:10 PM 06/02/12 06:10 PM
A Anonymous Unregistered
Anonymous Unregistered A	The only problem I've ever had with an MSD mis-firing was when the alternator was dying and it wasn't getting the voltage it needed to perform correctly.

Re: MSD 6AL problem [Re: HOTHEMI] #1244185 06/02/12 06:14 PM 06/02/12 06:14 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: I have an MSD 6AL with a race mechanical advance MP distributor and Accel coil in my Challenger street car. It has a 426 Hemi , everything basic checks out fine but has developed a misfire that I can't pinpoint, do the MSDs have any issues like this or do they just die completely ? This setup has run flawless for me for better than 15 years . Don't just want to start replacing expensive parts for no reason. Thanks I had a high rpm mis and did a A-B-A test with my back up box (7AL) and it was the box(both boxes were 7AL)... sent it into MSD and they said it was fine but when I got it back it magically worked fine

Re: MSD 6AL problem [Re: MR_P_BODY] #1244186 06/02/12 07:51 PM 06/02/12 07:51 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	you might want to check the air gap on the pick up coil in the distributor plus you can check the ohmn reading on the pickup coil also...had one go back last year...shooting ducks going down the track. Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: MSD 6AL problem [Re: HOTHEMI] #1244187 06/02/12 08:52 PM 06/02/12 08:52 PM
Joined: May 2004 Posts: 12,418 Taxes & Virus's R-US, NY Dragula I Live Here
Dragula I Live Here Joined: May 2004 Posts: 12,418 Taxes & Virus's R-US, NY	My 6AL has a miss all summer long, and then this winter, it killed the accel coil, then two weeks later the 6AL itself went and quit entirely. The coil I pulled out was all puffed up to, and I think the box killed it. I put a Crane HI6 in it, and the idle and throttle response was immediately better. '70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft) https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car) https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car) https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9) '66 Barracuda AWB Stretched nose Blown 440 Car in build stage '71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph https://www.youtube.com/watch?v=Znuo3jMUXTk

Re: MSD 6AL problem [Re: Dragula] #1244188 06/03/12 02:40 AM 06/03/12 02:40 AM
Joined: Jul 2007 Posts: 653 Fort Worth, TX Dago Red mopar
Dago Red mopar Joined: Jul 2007 Posts: 653 Fort Worth, TX	Done any welding on the car recently? If You Can't Be Good, At Least Be Colorful

Re: MSD 6AL problem [Re: Dago Red] #1244189 06/03/12 08:42 AM 06/03/12 08:42 AM
Joined: Jan 2003 Posts: 332 14437 H HOTHEMI OP enthusiast
HOTHEMI OP enthusiast H Joined: Jan 2003 Posts: 332 14437	No welding. It has a MP Tach drive mechanical distributor and the cap-rotor and pickup coil are different than the vacuum electronic. does anyone still supply these parts ? or does MP still make this distributor ? Thanks

Re: MSD 6AL problem [Re: HOTHEMI] #1244190 06/03/12 11:36 AM 06/03/12 11:36 AM
Joined: Jan 2003 Posts: 332 14437 H HOTHEMI OP enthusiast
HOTHEMI OP enthusiast H Joined: Jan 2003 Posts: 332 14437	The distributor is an older cast iron type, can I convert a regular electronic type to the race style by blocking off the vacuum advance and adding the lighter springs ? are the counter weights the same ? Thanks

Re: MSD 6AL problem [Re: HOTHEMI] #1244191 06/03/12 03:13 PM 06/03/12 03:13 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Quote: No welding. It has a MP Tach drive mechanical distributor and the cap-rotor and pickup coil are different than the vacuum electronic. does anyone still supply these parts ? or does MP still make this distributor ? Thanks cap and rotor can still be bought.. i ordered cap and rotor for 70 cuda 440 sixpac from autozone..same cap and rotor.. cap part number Part Number: AL950 rotor Part Number: AL937 as far as the pickup coil..the replacement with the new plate is not available..but..the pickup coil is the same as used on the vacuum advance distributor and is held in with pop rivet.. just drill out pop rivet on your plate and replace with new pick up coil ... i did that a year ago and the MP is working just fine. if you order the superseded part number you will get the vacuum advance pickup coil and plate. Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: MSD 6AL problem [Re: HOTHEMI] #1244192 06/05/12 09:20 AM 06/05/12 09:20 AM
Joined: Jan 2003 Posts: 13,404 Marion, South Carolina [><] an8sec70cuda I Live Here
an8sec70cuda I Live Here Joined: Jan 2003 Posts: 13,404 Marion, South Carolina [><]	I've had MSD 6AL boxes w/ high speed misfires, intermittent misfires, and die completely. All were cured by having them rebuilt by either MSD or TechWest Racing in North Carolina. Low voltage is the biggest killer. CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax

Re: MSD 6AL problem [Re: an8sec70cuda] #1244193 06/05/12 09:27 AM 06/05/12 09:27 AM
Joined: May 2004 Posts: 12,418 Taxes & Virus's R-US, NY Dragula I Live Here
Dragula I Live Here Joined: May 2004 Posts: 12,418 Taxes & Virus's R-US, NY	Quote: Low voltage is the biggest killer. That is interesting right there! Mine died in the winter, and the battery was low, but not low enough to not kick over. Bet its just one componant that can't handle the current draw... ..Since then, I put the Crane in, the thing starts almost instantly now... '70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft) https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car) https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car) https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9) '66 Barracuda AWB Stretched nose Blown 440 Car in build stage '71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph https://www.youtube.com/watch?v=Znuo3jMUXTk

Re: MSD 6AL problem [Re: Dragula] #1244194 06/05/12 09:49 AM 06/05/12 09:49 AM
Joined: Jan 2003 Posts: 13,404 Marion, South Carolina [><] an8sec70cuda I Live Here
an8sec70cuda I Live Here Joined: Jan 2003 Posts: 13,404 Marion, South Carolina [><]	Yep, if you have a car that sits for a long time and then you crank it up w/o charging the battery up...there's a VERY good chance you'll damage the MSD. CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax

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