Once my 340 gets warmed up it stalls and tonight unfortunately it took me 2 hours to get home. I drive it a mile and then it stalls have to wait a half an hour and so on before it starts back up. during the half an hour intermissions I check for spark and there's nothing.
I swapped out the ballast and that didn't help and I switched out the ECU module and that didn't help. I pack spares of those.
Someone recommended that I switch out the magnetic pickup and so I did that about two weeks ago and the part was made in China by a company called Standard that I got from summit.
Any suggestions what I should do moving forward?
Maybe I have another bad magnetic pickup?
Any suggestions?
I have commonly seen the pick up fail as it gets warm , could also be the coil
Coil is brand new from Mancini. I could put the backup coil on just for fun. I might have to buy another magnetic pickup and see if that helps.
Check the gap at the pick up. Gap too big?
Gap seems right. The gap is the size of a business card and even.
Does the engine start to run rough, sputter before it stalls, or does it just shut off as if you turned the ignition off ?
When I check for spark these days , I now get a spare spark plug, connect it to one of the plug wires, and then use jump cables connecting the ground of the plug to a reliable ground. Trying to ground the side of the plug directly to the frame has just not been reliable for me.
If you have a rallye dash, disconnect the tach. Then go for a short drive. :alan2cents:
I have a rallye dash. What's the easiest way to unhook the tach? Thanks
I don't have any sort of a choke hooked up, I have it all pulled out since I live in a desert.
Thanks for all your help so far.
Unhooking right at the coil will take it out of the mix.
According to my wiring diagram the yellow one is the one to the tach, is that correct? Thanks
Looks like I have a gray and a brown wire in there too. Thanks
I don't remember which colour but if you disconnect the wrong one it won't hurt anything, definitely won't start though....Go with what your diagram says.
Another thing. Did you verify fuel when it stops? I had a car with a plugged fuel filter years ago that would stop running from fuel starvation. If I waited a bit it would refire and go for a short distance again before all the crud in the filter would plug up the filter and stop fuel flow again. I know you said it had no spark, but it seems eerily similar to a plugged filter episode I had years ago. :alan2cents:
:alan2cents: The gray/tan wire on negative side of coil is the tach.
I had a coil that would get hot and quit after it cooled off it started up again, I even had a fuel pump that would quit at the speed of around 40 miles an hour
:iagree:Have seen that a couple of time's. :yes:
Took my new coil off and put on the one that looks like it was made in 1973 and my stalling problems seem over. I did everything I could to make it stall. I hope the problem is solved.
They dont make quality parts anymore as that is the second coil I have bought in the past year that failed.
Thanks for your help everyone.
Is the coil mounted horizontaly or vertically? I have had MSD coils fail when I mounted them in the horizontal position. Some say it doesn't matter but I've had trouble with them failing mounted that way.
Its mounted horizontal and it was a firecore...https://www.manciniracing.com/marafihpco.html
Its sad to think I managed to have both of these fail.
I use the Mancini Racing relocating coil bracket that allows you to mount the coil vertically.
Sorry. Late to the thread.
Glad you have it sorted. Yes, I have had same issue with sidways coils. Even though mfgr states it is ok. My clue was found by accident. I touched the coil and it was blazing hot.
I also had a coil fail while driving down the road. It was a yellow coil (Accel?) and mounted horizontally. I touched the bottom of it and my hand had oil on it which is how I found it had failed.
Terry
Quote from: RUNCHARGER on January 18, 2021, 09:10:57 PM
Is the coil mounted horizontaly or vertically? I have had MSD coils fail when I mounted them in the horizontal position. Some say it doesn't matter but I've had trouble with them failing mounted that way.
:iagree:
I use an MSD blaster 2 coil mounted vertically. Been on there for 10 years or so. Instructions say to mount vertically, horizontal mounting will likely cause failure.
Anyone have issues with horizontally mounted Pertronix coils?
Been considering going with one of theirs for a future small block build.
My :alan2cents: to this thread. This silver/chrome Accel coil has been mounted horizontally since the early 80's on my car with no issue. Its location has been changed but has always been horizontal. Hope this didn't just jinx me. I still carry the factory original one as an emergency spare.
I've used both Petronix and MSD cannister coils mounted horizontally without issues for years.
(https://www.thelightninground.com/filedata/fetch?id=1134&d=1588801641)
:dunno: