F1-missing

G

Gick70

Senior Member
My flathead just started missing,it misses in 3 rd gear with the gas pedal mashed going up hill,it doesn,t miss any other time. Where to start??
 
How old is the ignition system under heavy excel spark plugs are usually the first thing to try but don’t forget cap wires rotor points and condenser keep us informed
 
remove and look at plugs-anyone of them different looking indicating a miss? clean and replace if this does not help then new plugs (autolite 216) would be the first change, then plug wires, cap, rotor. how long
 
1. Check the timing with a light. Put the pointer on the pulley dot. (stock specs)
2. Go through the tune up stuff.
 
I am not that knowledgeable on the vacuum only advance distributors, but will a vacuum leak or malfunction cause this type of issue? It would at the least cause the timing to be retarded.
 
JSeery said:
I am not that knowledgeable on the vacuum only advance distributors, but will a vacuum leak or malfunction cause this type of issue? It would at the least cause the timing to be retarded.
Click to expand...
This is a good point. If the vacuum canister on the LOM distributor has gone bad, it will not advance properly...or at all. Also the springs in the distributor on that end is worth a look.
The distributor may need a overhaul if the timing and tune up stuff does not help.
Then there's the fuel end but one thing at a time.
 
This was a timing issue. This was before I timed it with a light. It was advanced way too far.

I was going through the tune up stuff as this car would barely run. I did not realize how bad it was until I started to go through it.
Before I put it on the light, I tried to set it by ear with a Vacuum gauge. I put the distributor where the PO had it.

What I did not realize is how tinny it sounded. As I retarded it with a light, setting it to the correct position, the RPMs dropped, the sound changed from the tinny sound in the video do a deep steady rumble with no miss.

Here it is missing at idle.
https://www.youtube.com/watch?v=s17qGqm57-g
 
The timing is great on my thread,I just gave it new points and condenser,still have problem,maybe accelerator pump?
 
Vacuum canister,if applied suction(brake bleeder pump use )the vacuum canister linkage moves but doesn't hold any pressure,this is faulty,correct!!
 
Ok,I put,new points,new condenser,new plugs,vacuum canister had hole in,replaced,swap out rebuilt carb...same,swap out different fuel pump...same ,wires look newer,cap looks newer,rotor looks newer......starts up great,idles great,drives at first good cold .....then starts to miss like running out of gas,now what?
 
While my similar problem was with the earlier distributor, My coil was quite hot as I had switched to 12 V with a bosch super coil and the spark was grounding to the rotor shaft right through the rotor. ONLY noticed the missing after warm and climbing hills in high gear at wide open throttle.... UNTIL the vehicle just stopped on the way home from lunch. Do the later distributors get the shorted rotor thing?
 
Check your distributor cap carefully. I had a miss on a '50 that dogged me for a long time. The cap looked good, but I couldn't see that the graphite "button" at the top was cracked and made intermittent contact.

Ken
 
You must log in or register to reply here.
Back
Top