After the truck sitting overnight i attempted to start it and it just cranked over and over and over. This happened just a few days ago and i check for spark and was not getting any. With a test light in hand i trouble shooted it and narrowed it down to my MSD 6aL box..The coil was'nt recieving any power/signal from the box. Since i had an extra 6AL i figure i give it a shot and swaped it. It worked ... but after driving last night and then coming home (first time driving it since the MSD swap) and let the truck sit overnight, i tried to start it this morning it happend again .. crank over and over .. with no avail. It wont start .. i hope i didnt fry or damage the MSD box. Tonight im gonna bench the old MSD to see if its fried
MSD problem Truck wont start
- Thread starter DaKine
- Start date
live1053rulz
Nor Cal SyTy
Re: MSD problem Truck wont start
Aye, I hear the MSD boxes suck in our trucks for the most part. Try a search and read up on it, might wanna ditch that thing... Judging by a sticker on my truck, it looks like it had an MSD box on it at one point. Whoever had it probably took it off because it sucked.
Aye, I hear the MSD boxes suck in our trucks for the most part. Try a search and read up on it, might wanna ditch that thing... Judging by a sticker on my truck, it looks like it had an MSD box on it at one point. Whoever had it probably took it off because it sucked.
dgoodhue
BuSTeD 4.3
Re: MSD problem Truck wont start
I would check your MSD connections to make sure wires aren't shorted somewhere, killing the MSD boxes. I have only had one problem with my MSD and it was my fault. I left the coil wire off and I had the MSD wiring lying on top of the coil, it zapped the box through the wiring.
I would check your MSD connections to make sure wires aren't shorted somewhere, killing the MSD boxes. I have only had one problem with my MSD and it was my fault. I left the coil wire off and I had the MSD wiring lying on top of the coil, it zapped the box through the wiring.
Re: MSD problem Truck wont start
Well i took out the msd as a whole, wires and all .. just R&R the msd I will double check the Harness connectors to see if anything was wrong.
The spare box came out of my Tahoe.. and it was hooked up in the Tahoe, running well for years.
I also have a Msd blaster coil. fyi
dgoodhue said:
Well i took out the msd as a whole, wires and all .. just R&R the msd I will double check the Harness connectors to see if anything was wrong.
The spare box came out of my Tahoe.. and it was hooked up in the Tahoe, running well for years.
I also have a Msd blaster coil. fyi
live1053rulz
Nor Cal SyTy
Re: MSD problem Truck wont start
My ign. is stock, from what I heard it doesn't make much of a difference. But I'd listen to Dave's advice before mine, he probably knows what he's talkin about, I'm sure some have had success with the Box.
My ign. is stock, from what I heard it doesn't make much of a difference. But I'd listen to Dave's advice before mine, he probably knows what he's talkin about, I'm sure some have had success with the Box.
SnakeEater
Sleep Dog Racing
Re: MSD problem Truck wont start
There is an internal fuse on these boxes and you mite be shorting somewhere and popping that fuse. From what i know you can replace them but you have to pop the rivets on the box...Im running a 7a-l w/ hvc pro power coil with no problems.....Cleaned up my idle, throttle response and most of all im not going threw plugs twice a week like i was before.... :2cents:
There is an internal fuse on these boxes and you mite be shorting somewhere and popping that fuse. From what i know you can replace them but you have to pop the rivets on the box...Im running a 7a-l w/ hvc pro power coil with no problems.....Cleaned up my idle, throttle response and most of all im not going threw plugs twice a week like i was before.... :2cents:
Re: MSD problem Truck wont start
Hi folks,
I run an old MSD 6A in my Syclone. Seems to fire up the motor quicker in cold weather--esp. when using 100 octane (slow-burning) race gas. Probably does idle a bit smoother, as well. I will admit, though, that I seem to have to change the distributor cap/rotor every coupla thousand miles. That's the only disadvantage, at least for me. Your results may vary!
Craig Stangohr
Aiken, SC
Sy 1563
12.71@106.42@18lbs
Hi folks,
I run an old MSD 6A in my Syclone. Seems to fire up the motor quicker in cold weather--esp. when using 100 octane (slow-burning) race gas. Probably does idle a bit smoother, as well. I will admit, though, that I seem to have to change the distributor cap/rotor every coupla thousand miles. That's the only disadvantage, at least for me. Your results may vary!
Craig Stangohr
Aiken, SC
Sy 1563
12.71@106.42@18lbs
cloneman315
Active member
Re: MSD problem Truck wont start
msd do make a difference on these trucks they idle better etc and u will need msd on higher boost aplications,and msd products are very good ,i would check all your connections im sure that it is in a plug etc which is killing the boxes,i have you msds on many vehciles and never had a problem,just keep them awy from main harness lines etc so u have no interference also away from the ecm
msd do make a difference on these trucks they idle better etc and u will need msd on higher boost aplications,and msd products are very good ,i would check all your connections im sure that it is in a plug etc which is killing the boxes,i have you msds on many vehciles and never had a problem,just keep them awy from main harness lines etc so u have no interference also away from the ecm
Re: MSD problem Truck wont start
update. I double checked the lines and no break anywhere. Cannot put it back to stock ign because the stock fuse under the dash is missing and i dont know what kind of fuse it uses. (not a blade fuse) two plugs.
After messing around with the wiring i cranked it over and what do you know it started .. i killed and started it 10 or so times and no problems. Then when upstairs got cleaned up and went back to the truck and :rant: it wont start! .. Talk about Love/Hate relationship with these trucks.
I just need to know about the stock fuse for (ign) under the dash if any can look and see what it is or where i can get it that would be great. I will also searh the fourms.
Thanks
update. I double checked the lines and no break anywhere. Cannot put it back to stock ign because the stock fuse under the dash is missing and i dont know what kind of fuse it uses. (not a blade fuse) two plugs.
After messing around with the wiring i cranked it over and what do you know it started .. i killed and started it 10 or so times and no problems. Then when upstairs got cleaned up and went back to the truck and :rant: it wont start! .. Talk about Love/Hate relationship with these trucks.
I just need to know about the stock fuse for (ign) under the dash if any can look and see what it is or where i can get it that would be great. I will also searh the fourms.
Thanks
cloneman315
Active member
Re: MSD problem Truck wont start
did u check the igntion module in the distributior?i would just change it for the heck of it
did u check the igntion module in the distributior?i would just change it for the heck of it
Re: MSD problem Truck wont start
I had actually bought one (also a new Blaster coil) when i first came acrosss the problem .. but after i swapped the Msd box out and the truck ran i just returned the parts. I thought of it too i should have just changed it out for the heck of it. But would it be the fix?
I think i should just revert back to stock ign for now cause the truck is pretty much stock. All i got is a filter/borla exhaust/deleted cat. Can you or someone check as to what goes in the fuse box (as in my earlier post) its almost to the top marked *ign*. I just want to get the truck running.
Thanks
cloneman315 said:
I had actually bought one (also a new Blaster coil) when i first came acrosss the problem .. but after i swapped the Msd box out and the truck ran i just returned the parts. I thought of it too i should have just changed it out for the heck of it. But would it be the fix?
I think i should just revert back to stock ign for now cause the truck is pretty much stock. All i got is a filter/borla exhaust/deleted cat. Can you or someone check as to what goes in the fuse box (as in my earlier post) its almost to the top marked *ign*. I just want to get the truck running.
Thanks
Re: MSD problem Truck wont start
Thanks for the amp #, but its not a blade type fuse but a different type of fuse. when i tried The blade type fuse it wont fit. or does it.
Can someone take a picture of thier fuse block. i know its alot to ask but it would be a big help to me.
Thanks
SY2455 said:
Thanks for the amp #, but its not a blade type fuse but a different type of fuse. when i tried The blade type fuse it wont fit. or does it.
Can someone take a picture of thier fuse block. i know its alot to ask but it would be a big help to me.
Thanks
Bill Z
Donating Member
Re: MSD problem Truck wont start
My truck came with the MSD and the big coil. I lived with it for some time. It started acting up just like you indicated above. When I messed with the wires, it started working. One day I got tired of it all and just started probing around with my volt meter.
Found that the wire harness provided by MSD had a ‘Y’ connection in it. Right in that ‘Y’ there was a bad solder joint. You couldn’t see it because of the shrink wrap. I checked the voltage before it (had voltage). Then, on the other side (no voltage). Wiggled the connection a little (Voltage).
I stripped back the insulation and the pieces just came apart. May be the leadless solder they are using to save the planet. I soldered them back together using old fashion lead solder. Used electrical tape and the problem didn’t reoccur.
I didn’t like replacing the spark plugs, cap & rotor every 3 months so I took the MSD out. It doesn’t get cold down here to worry about starts.
Hope this helps.
My truck came with the MSD and the big coil. I lived with it for some time. It started acting up just like you indicated above. When I messed with the wires, it started working. One day I got tired of it all and just started probing around with my volt meter.
Found that the wire harness provided by MSD had a ‘Y’ connection in it. Right in that ‘Y’ there was a bad solder joint. You couldn’t see it because of the shrink wrap. I checked the voltage before it (had voltage). Then, on the other side (no voltage). Wiggled the connection a little (Voltage).
I stripped back the insulation and the pieces just came apart. May be the leadless solder they are using to save the planet. I soldered them back together using old fashion lead solder. Used electrical tape and the problem didn’t reoccur.
I didn’t like replacing the spark plugs, cap & rotor every 3 months so I took the MSD out. It doesn’t get cold down here to worry about starts.
Hope this helps.
SY2455
70's Veteran
Re: MSD problem Truck wont start
OK lets try this, looking at your fuse block 2nd row from the left from the bottom.
2 Bottom not used
10 Amp - ECM1
15 Amp - Turn Bu
20 Amp - IGN/Gau
Shunt
IGN - Not used
This IGN - Not used is for accessory plug in, It takes a special male plug that you can buy from any GM dealer or auto wrecking yard. If I recall correctly it is only hot when the key is in the on position.
DaKine said:
OK lets try this, looking at your fuse block 2nd row from the left from the bottom.
2 Bottom not used
10 Amp - ECM1
15 Amp - Turn Bu
20 Amp - IGN/Gau
Shunt
IGN - Not used
This IGN - Not used is for accessory plug in, It takes a special male plug that you can buy from any GM dealer or auto wrecking yard. If I recall correctly it is only hot when the key is in the on position.