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I dont really have enough experience to say that its leaning out or getting too rich. When it stalls, if I hold the throttle open it pops pretty bad, and it trys to run if I pump the throttle. If I let off the throttle it dies completely.
Those are the symptoms of a weak spark and/or too lean of a fuel mixture.
I think what I am going to try is to swap carbs with my dads oldsmobile. His is a 700cfm and mine 750, but I think they should be close enough. That will eliminate any issues with the carb. I am also gonna try and rig up my timing light in the cab and see if I am getting spark when it tries to stall.
I was thinking about this a little more, and another idea came to me that you might want to add to your things to check list. Can you remember, does this happen during a throttle transition such as pulling out from a stop sign, and then letting up on the accelerator going part throttle? Or vice-versa? Are you running vacuum advance? Reason I am asking is that if you have a loose breaker plate ground strap inside your distributor, this can cause a loss of spark especially during throttle transitions. And with vacuum advance the breaker plate is moving back and forth a lot depending on engine load. (Not a knock on vacuum advance here. I added vacuum advance to my distributor, and picked up another 2 to 3 mpg.)
I was thinking about this a little more, and another idea came to me that you might want to add to your things to check list. Can you remember, does this happen during a throttle transition such as pulling out from a stop sign, and then letting up on the accelerator going part throttle? Or vice-versa? Are you running vacuum advance? Reason I am asking is that if you have a loose breaker plate ground strap inside your distributor, this can cause a loss of spark especially during throttle transitions. And with vacuum advance the breaker plate is moving back and forth a lot depending on engine load. (Not a knock on vacuum advance here. I added vacuum advance to my distributor, and picked up another 2 to 3 mpg.)
Yes it does that sometimes, as well as when I let off the throttle duting shifting. I dont have vacuum advance though, only mechanical advance. Would I get the same issue with mechanical advance?
Yes it does that sometimes, as well as when I let off the throttle duting shifting. I dont have vacuum advance though, only mechanical advance. Would I get the same issue with mechanical advance?
Yes sir, I think it would since the breaker plate is also being advanced by the centrifugal advance weights inside the distributor. Just something else to check anyways.
Yes sir, I think it would since the breaker plate is also being advanced by the centrifugal advance weights inside the distributor. Just something else to check anyways.
I pulled the cap and rotor off the distributor and I am not sure if this MSD uses a breaker plate or not. It just has a magnetic pickup with an 8 point rotor that is advanced by the weights. I did find that my rotor and cap contacts are a littlw burnt. Would this be a symptom/sign of something wrong with my ignition? I am pretty sure they did not look like this when I had the distributor apart 500 miles ago.
F
I bet if you ditch all the MSD gear and go normal ignition your problems would go away .
I have heard so many instances of it causing trouble , I reckon it's over priced junk .
I pulled the cap and rotor off the distributor and I am not sure if this MSD uses a breaker plate or not. It just has a magnetic pickup with an 8 point rotor that is advanced by the weights. I did find that my rotor and cap contacts are a littlw burnt. Would this be a symptom/sign of something wrong with my ignition? I am pretty sure they did not look like this when I had the distributor apart 500 miles ago.
F
I am not familiar with that type of distributor, but from looking it up in Google Images, it's looks like you are right. The magnetic pick up appears stationary, so in your distributor, the ground is probably fed into the pick-up coil via the harness fed to it. So my suggestion of a loose ground strap would not apply to what you have. Sorry about that!
Looking forward to hearing if when the next time it quits, you still have spark.
I pulled the cap and rotor off the distributor and I am not sure if this MSD uses a breaker plate or not. It just has a magnetic pickup with an 8 point rotor that is advanced by the weights. I did find that my rotor and cap contacts are a littlw burnt. Would this be a symptom/sign of something wrong with my ignition? I am pretty sure they did not look like this when I had the distributor apart 500 miles ago.
F
I am not familiar with that type of distributor, but from looking it up in Google Images, it's looks like you are right. The magnetic pick up appears stationary, so in your distributor, the ground is probably fed into the pick-up coil via the harness fed to it. So my suggestion of a loose ground strap would not apply to what you have. Sorry about that!
Looking forward to hearing if when the next time it quits, you still have spark.
I bet if you ditch all the MSD gear and go normal ignition your problems would go away .
I have heard so many instances of it causing trouble , I reckon it's over priced junk .
I guess this why I am so fascinated by this. I had similar problems with a year old Pertronix II Billet distributor, just a month out of warranty. Had to send it back to Pertronix, and they gave me a price break to convert it to a Pertronix III. I asked my engine builder about it, and which electronic ignition he recommended. He told me he has seen problems with all of them. His recommendation was to just go to a good salvage yard, and get a Duraspark with the module. If I have Pertronix problems again, I will try that route.
So I figured out what is making the truck stall, though I am not sure yet what is causing the issue that is making the truck stall. My dad was helping me set the float bowl since I had the needle and seat out. We were messing the the accelerator pump nozzles and let the engine get up to temp and idle for a while. I gave it some gas and held it at tue same rpm, and fuel started shooting out of the vent, and the engine started to die. I got it to do it one more time after that. I am gonna replace the needle and seat tomorrow and go from there. I am not convinced the needle is the issue since it is so intermittent. Has anybody ever had a fuel pump put out too much pressure, or could something in the carb be pushing fuel out?
I believe a carb needs no more than 7lbs or the needle simply can't hold it .
My fuel pump is speced at 6 psi max, but I am not rulling that out. The only thing is that its so intermittent i dont know if a pump would act like that.
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