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Discussion Topic:
Weird miss on V8
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37RAGTOPMAN |
09-13-2019 @ 12:04 PM
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Senior
Posts: 1969
Joined: Oct 2009
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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
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keith oh |
09-13-2019 @ 11:11 AM
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New Member
Posts: 116
Joined: May 2010
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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.
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TomO |
09-12-2019 @ 6:04 PM
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Senior
Posts: 7264
Joined: Oct 2009
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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
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rudy51custom |
09-11-2019 @ 8:10 PM
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Member
Posts: 4
Joined: Sep 2019
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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.
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TomO |
09-11-2019 @ 8:51 AM
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Senior
Posts: 7264
Joined: Oct 2009
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Did you determine which cylinders are failing? Is it random cylinders?
Tom
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pauls39coupe |
09-10-2019 @ 4:56 PM
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Member
Posts: 205
Joined: Jul 2014
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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?).
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rudy51custom |
09-09-2019 @ 8:55 PM
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Member
Posts: 4
Joined: Sep 2019
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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.
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Model B |
09-09-2019 @ 8:35 PM
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Member
Posts: 90
Joined: Oct 2009
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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
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carcrazy |
09-09-2019 @ 8:03 PM
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Senior
Posts: 1683
Joined: Oct 2009
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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.
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rudy51custom |
09-09-2019 @ 7:02 PM
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Member
Posts: 4
Joined: Sep 2019
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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.
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