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Author Topic:   msd module problems
mikestearns
Dirt Roller

Total posts: 6
posted May 07, 2005 10:21 PM  
Having problems with modules in msd distrubutor, bought brand new last year msd hei type distributor ran fine till this year
runs fine then begins to act like it has a rev limiter on it missses, countiues to get worse until it finnaly shuts off, can change the module then will run again
have tried new cap coil etc.. no luck countiues the same thing any ideas? thanks

allan
Dirt Maniac

Total posts: 107
posted May 08, 2005 06:31 AM  
a racer i know did a little welding on his car then started having problems with his msd module,replaced it and had no problems.

istock2
Dirt Newbie

Total posts: 4
posted May 08, 2005 09:44 AM  
sounds like you answered your own question. if you changed the module and the problem went away then the mod. is bad

mikestearns
Dirt Roller

Total posts: 6
posted May 08, 2005 01:06 PM  
yes i repalced it but it quit working 5 laps later smae way began to miss then finnaly shut off got back to pits and put the supposed bad module on and it works again?

sidebiteu259
Dirt Full Roller

Total posts: 56
posted May 08, 2005 07:21 PM  
Instead of coming on here and asking some fools that know nothing call the source MSD number is 915 857 5200 ask for a john clark he will be able to direct you to a tech that KNOWS what they are talking about.

racerman707
Dirt Freak

Total posts: 374
posted May 09, 2005 06:40 AM  
"Fools that know nothing". You'll need help from the board one of these days.

midmod34
Dirt Maniac

Total posts: 119
posted May 09, 2005 04:48 PM  
mike the msd modules are killed by a bad ground put a strap from motor to frame this may be your problem

ss99
Dirt Maniac

Total posts: 120
posted May 10, 2005 07:09 AM  
Agree with midmod34. Sounds like you've got a ground issue. Ground the motor to the frame well and check your ground strap under the coil in the dist.

mikestearns
Dirt Roller

Total posts: 6
posted May 10, 2005 07:20 PM  
called msd, they seem to think it is the ignition wires I was not aware that I had solid core wires from midwest motorsports, they said you must run spiral wound wires with msd. Thanks for your ideas but I had already ran extra ground straps and checked grounds but thanks for your advice.

sidebiteu259
Dirt Full Roller

Total posts: 56
posted May 11, 2005 11:14 AM  
WOW called the source and got good information who would have thought It.

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted May 11, 2005 11:56 AM  
I highly doubt it would be the ignition wires. We have ran the Midwest wires on a lot of our motors with an MSD HEI. The wires we currently run are Scott Performance Wires. You might fire the car up and check all your connections with a voltmeter. You have replaced the Module and it'll work for a while. That tells me something isn't right, and it isn't the wires. If they send spark now they should later without any hesitation. What kind of plugs are you running, along with carburetor type, fuel pump type. You might fire the car up and let it run until it starts to miss and pull a plug wire, and check to see if one of them is not getting full spark. I do agree that spiral wound will definately tell you whether it is the problem or not, but I'd tend to think otherwise. You will also want to check the ground at the battery. Start the car and run your voltmeter across everything you can think of. We have seen stupid things like switches, buttons, ford silinoids, even a faulty end on a wire mess up these MSD HEI's.


Donnie Ross
Dirt Freak

Total posts: 264
posted May 12, 2005 08:37 PM  
have you checked voltage drop across the ignition switch? It almost sounds as if the switch or primary wiring has to much resistance causing heat build up wich causes more resistance continually dropping voltage available for the module and coil.also voltage isn't all thats needed an hei of any brand has a high instant amp draw,GM recomends a 10 gauge wire and feeding only the ignition from the ignition switch, all other electrical loads should be run on a seperate switch and feed wire, hope this helps, by the way solid core wires won't hurt an hei and chevy even recomends them.

[This message has been edited by Donnie Ross (edited May 12, 2005).]

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