Early Ford V-8 Club Forum

EFV-8 Club Forum / General Ford Discussion / Weird miss on V8

Reply to Discussion | New Discussion << previous || next >>

Posted By Discussion Topic: Weird miss on V8 -- page: 1 2     37RAGTOPMAN 09-13-2019 @ 12:04 PM reply profile send p.m. Senior Posts: 1940 Joined: Oct 2009 hi I had a problem with the electronic system on my 57 CHEVY, I when back to points, and problems solved these are a problem in the making, point system is much easier to figure what the problem is when having issues, also I would take a compression test, if ok., add MARVEL MYSTERY OIL in the gas, I suspect a sticking valve, if the car has been idle for a long while when the misses does it make any noise ? tapping,? check all your primary ign connections, any loose nuts on terminals and take for a ride, see if the miss does not happen get back to us, let us know, my 2 cents 37RAGTOPMAN This message was edited by 37RAGTOPMAN on 9-13-19 @ 12:09 PM keith oh 09-13-2019 @ 11:11 AM reply profile send p.m. New Member Posts: 116 Joined: May 2010 I have seen and experienced weird ignition misses caused by old carbon fiber spark plug wires that have broken down and shorting out. Sometimes it can be seen in the dark sparking like mini fireworks. TomO 09-12-2019 @ 6:04 PM reply profile send p.m. Senior Posts: 7243 Joined: Oct 2009 If you get the miss again, try pouring a little Marvel Mystery oil down the carburetor. If the miss goes away for a few days, you might have a sticky valve. If it doesn't, try going back to points and see if that fixes it. Tom rudy51custom 09-11-2019 @ 8:10 PM reply profile send p.m. Member Posts: 4 Joined: Sep 2019 When it happens, it seems to be the same cylinder, but not every power stroke for that cylinder. Sometimes 2-3 in a row, sometimes only one, then not again for 10 - 20. Completely random, but feeling like it's one cylinder, maybe two. If it was one cylinder all the time, it would be easy to figure out. I took it to town today, temp outside was low 30's celcius (around 90F), and it never skipped a beat at all. I've ordered plugs, cap and rotor. Thought I might as well, since I was ordering other stuff anyway. Will see what happens when the parts come in. TomO 09-11-2019 @ 8:51 AM reply profile send p.m. Senior Posts: 7243 Joined: Oct 2009 Did you determine which cylinders are failing? Is it random cylinders? Tom pauls39coupe 09-10-2019 @ 4:56 PM reply profile send p.m. New Member Posts: 199 Joined: Jul 2014 If you can eliminate the advance as the source of your problem, next I would look at the power valve in the base of the carb. The power valve should enrich the mixture under load ( 40-55 mph?). rudy51custom 09-09-2019 @ 8:55 PM reply profile send p.m. Member Posts: 4 Joined: Sep 2019 Had a quick look in the distributor tonight after kids were finally in bed. Cap does have something on the contacts where the rotor passes by. Doesn't look like corrosion, but I'd say more likely to be arc damage. Rotor contact has it too, and looks like previous owner has rather ham-fistedly cleaned the rotor already at least once. Could be the rotor-cap gap is too big. Distributor issues can be intermittent I don't have overdrive, unfortunately. Vacuum advance was going to be my next suspect. If things are a bit wonky, the shoe might fit. Model B 09-09-2019 @ 8:35 PM reply profile send p.m. Member Posts: 89 Joined: Oct 2009 Just a thought....When my '50 Tudor began to miss a while back, I tried to isolate where the miss was. Can be frustrating for sure! I tried replacing some of the ignition parts i.e. plugs & wires etc. Found the problem to be the vacuum advance had a bad diaphram. Replaced it and it has run great ever since. Good luck, Pat carcrazy 09-09-2019 @ 8:03 PM reply profile send p.m. Senior Posts: 1584 Joined: Oct 2009 Does the car have overdrive? The kick down switch interrupts the ignition when the accelerator pedal is pushed down to the floor or near it. My car with overdrive will occasionally miss when the pedal is near the floor but not quite near enough to cause a downshift to occur. rudy51custom 09-09-2019 @ 7:02 PM reply profile send p.m. Member Posts: 4 Joined: Sep 2019 I've pulled the plugs a couple times. They all look the same. They're a bit darker than the one shown in the chart as "normal". There's no deterioration on them at all, and they're Autolite 216's. I did run the gapper through, and they're all at 25, or close enough to be considered 25. It happens cold or hot. Car has a 4 core rad in it, and electric fan that I don't use. I have a sneaking feeling there's no thermostats, as the temp gauge shows 100F unless you get stuck in traffic. Even in the heat of summer, sits at 100F. Yes, it works, and so does the other temp gauge the previous owner installed. It can't be icing with an ambient temp of 60F, can it? It's happened on an afternoon closer to 80F as well. Also, forgot to say, has Offenhauser 2 carb intake with two Ford carbs.

<< previous || next >>

PAGE: 1 2

NOTE: YOU MUST BE A REGISTERED USER AND BE LOGGED IN TO POST (and reply to) messages in this forum. If you are a first time user, please click the CREATE A NEW ACCOUNT in the masthead above to register and Log In. After that, all you do is LOG IN to enjoy using this site.

DISCLAIMER: The V-8 Club does no independent testing of any of the opinions, thoughts or suggestions presented in the website on the Forum, in the Tech Tips section, or any section. A reader should consider the website to be a forum wherein differing solutions to a particular set of circumstances may be discussed. Ultimately, the selection of an item for an individual's vehicle must be based upon the independent study of the vehicle owner in consultation with people in the hobby and restoration experts.

EFV-8 Club Forum Home | Back to Home Page | Contact the Webmaster

Copyright © 2009 - EFV-8.org
Powered by < CF FORUM > v.2.1