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EFV-8 Club Forum / General Ford Discussion / Engine Miss "Only Under Load "

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Discussion Topic: Engine Miss "Only Under Load " -- page: 1 2

sarahcecelia

12-09-2019 @ 5:40 AM

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If a motor misses, ONLY UNDER LOAD, I'm thinking "it must be spark plugs," any others have other ideas about that??

They are fairly new Auto lite, and people tell me that Auto lite plugs are bad news, that I should change to Champion H10's.
Tell me your thoughts

I can push the clutch in and it revs smoothly, and normal acceleration is okay, but accelerate like you want to pass, and it misses.

Regards, Steve Lee

Model B

12-09-2019 @ 6:10 AM

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You didn't mention what year car you have. On my '50 Ford, when it was missing under load I replaced the plugs. Didn't help much. I use Autolite 216 plugs. They work well in my car. I finally solved my problem by replacing the vacuum advance canister on the loadamatic distributor. Works great now.

mfirth

12-09-2019 @ 8:49 AM

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Coil is also a possibility, or decreased fuel delivery under a load.

4dFordSC

12-09-2019 @ 10:31 AM

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You might check the plug wires, too. Easiest way is to wait until dark and then start the engine. Bad wires will cause arcing from the plug base to the cylinder head. FWIW, I use Autolite plugs with no problems.

carcrazy

12-09-2019 @ 2:53 PM

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Suspect marginal fuel supply, inadequate to handle increased load. Weak fuel pump is primary suspect.

sarahcecelia

12-11-2019 @ 5:04 AM

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Car is a I950 Ford sedan.

Regards, Steve Lee

51woodie

12-11-2019 @ 5:07 AM

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It is hard to define the term “miss” when it comes to engines. In my experience ignition issues such as a bad/loose electrical connection is akin to turning the key on/off, or a “stumbling” (jerky) feel under acceleration. With fuel flow issues on the other hand, an engine will slow or speed up as if the throttle was being peddled. In other words, a more gentle change than an ignition issue. A restricted (plugged) fuel filter will often allow low speed operation but the engine will die under hard acceleration or at higher speed. Yes, ignition systems also break down under acceleration as well, and there are a lot of causes, which need to be checked one at a time, and preferably with test equipment such as a volt/ohm meter etc.

sarahcecelia

12-11-2019 @ 5:17 AM

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It has MSD ignition and very high quality plug wires. This motor was built by H&H of California, it is fully hopped up, at a cost of $9,990.00. It's bored, has Navarro polished heads, 4 barrel polished intake manifold, Isky 400 Jr. cam, 390 Holley 4bbl. carburetor, with Mercury crank, cast iron headers, and the plugs need 2 washers so the valves don't hit the electrodes !!, and a Holley electric fuel pump,with a "block off" plate where the factory fuel pump would go, and a glass fuel filter. It's very fast!!

Regards, Steve Lee

This message was edited by sarahcecelia on 12-11-19 @ 5:25 PM

TomO

12-11-2019 @ 8:50 AM

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Because you had the engine modified, it is difficult to determine the source of your miss. When you modify the engine, you are responsible for making sure that all of the components are engineered to work together. Bogging down on acceleration is often the results of poor re-engineering.

It could be the MSD ignition or that the plugs are leaking compression due to the extra gasket or that the carburetor is not matched to the engine with its modifications. It could also be due to insufficient fuel delivery for your carburetor. It could also be that the cam is not meant for street driving. Here is the warning for the cam that you have:

" Info

Not for the faint of heart, and not for the street! This famous Isky 400 Jr. grind camshaft is full race, competition only and is recommended only for the experienced flathead V8 racer."

Start with finding spark plugs with the proper reach for your heads. The electrode should be in the compression chamber. Using an extra gasket is asking for trouble, you cannot get the correct torque and may get a compression leak.

Tom

4dFordSC

12-11-2019 @ 1:33 PM

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In view of all the modifications made to your engine, you might have better luck your question over on the HAMB.

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