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

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Discussion Topic: Weird miss on V8 -- page: 1 2

carcrazy

09-09-2019 @ 2:22 PM

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Posts: 1587
Joined: Oct 2009

Does the miss occur once the engine is fully warmed up? If it happens when the engine is cold or during initial driveaways when the ambient temperatures are below 35 degrees F, it maybe due to an icing condition. If you have cold ambient temperatures and high humidity, icing could be occurring at either the venturis or the throttle plates. Do you have the exhaust heat passages at the bottom of the intake manifold open?

TomO

09-09-2019 @ 1:17 PM

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First determine which cylinders are missing by shorting out one plug at a time and checking the engine speed as the plug is shorted. The plugs that don't make a big difference in engine speed are the failing cylinders.

Next pull the plugs and look for possible signs of the failure cause. Use this chart; http://www.verrill.com/moto/sellingguide/sparkplugs/plugcolorchart.htm

If you cannot determine the cause of failure or the missing cylinder cannot be found, change back to a point ignition to see if the electronic ignition module is failing.

Let us know what you find.

Tom

rudy51custom

09-09-2019 @ 12:47 PM

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I have a 51 4 door Custom with a flathead 8. It's an older restoration (30 ish years), and I just bought it a few months ago. Original engine was rebuilt, and changed to 12v, and electronic ignition. About 10 years and 7000 miles since rebuild. Don't know too much about the details of the history, just kind of an overview.

So, it ran great for the first few months I've had it. Since the weather has been cooling off up here in Canada, I've noticed a strange miss during acceleration on 1 or 2 cylinders. It does seem to be the same cylinders every time, as the miss is evenly spaced. Doesn't need to be WOT, or half open, even just a little will do it. Will miss a little as you accelerate, but where it really starts to come in is when the RPM's get up a bit.

At this point, everyone is saying plugs and wires, possibly distributor cap. And I'm with you on that, as that was my first thoughts, but keep reading.

For example, when in 3rd gear going down the highway, it will start to miss around high 40's, up until about 55mph. Between 55 and 60 and up, it's smooth as ever. If you're cruising at 60, and start to go up a hill, it will still run smooth, unless the speed dips below 55.

This doesn't fit with plugs, wires and cap, at least as far as makes sense to me.

All of this is intermittent as well. I went out this morning, it did it on my way out, but not back. My first thoughts were that it was caused by temperature. I don't want to rule that out, but I'm beginning to think it's probably something else. I don't think it's a fuel flow issue. It has an electric pump with filter, and a new fuel tank. If it was, it wouldn't run well over 55....

So, any ideas?

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