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Tko87 
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Joined: June-19-2012 Location: Louisiana Status: Offline Points: 59 |
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 Topic: Help pleasePosted: January-12-2020 at 7:24pm |
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79 FN 454 , 1410 carb. Pertronox dist and wires..
5 months ago it was running perfect when she started this weekend and it's missing at idle and when first giving it gas.. Eliminated spark plugs. Cannot figure it out and don't know where to go next |
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SNobsessed
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Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Posted: January-13-2020 at 12:42am |
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You can dry out the inside of the distributor cap with contact cleaner, or even WD40.
Also you can pull 1 spark plug wire at a time to see which one is missing. Then change that wire to another plug to see if problem follows. The EI module itself may have failed - they can do so without warning. |
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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Tko87
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Joined: June-19-2012 Location: Louisiana Status: Offline Points: 59 |
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Posted: January-13-2020 at 1:02am |
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There is no external module with this distributor.
Possibly wet inside ( thanks) |
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Tko87
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Posted: January-13-2020 at 8:36pm |
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Distributor cap was dry and apparently good. I did notice as I pull one wire off at a time off the distributor cap it doesn't seem to run any worse which is very puzzling only makes a difference on two or three of them which makes me wonder if it's a bad distributor although I do see spark
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: January-14-2020 at 9:48am |
How did you check for spark? Timing light? |
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Duane in Indy
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Joined: October-26-2015 Location: Indiana Status: Offline Points: 1578 |
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Posted: January-14-2020 at 10:24am |
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Keep it as original as YOU want it
1978 Mustang (modified) |
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Tko87
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Posted: January-14-2020 at 11:14am |
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I checked the timing with the timing light and it is good as far as spark go I just lifted the wire off of the cap however the spark look kind of weak but I'm really not sure how it's supposed to look
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11173 |
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Posted: January-14-2020 at 12:08pm |
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So let's see.................it runs, I think that tells you that you have spark
 It runs good at higher speeds it sounds like Have you looked at the carburetor at all? I'd look down the throats (primary and secondary) and make sure there are no drips/visible gas when it's idling. If there are drips, it will clear up with more throttle many times and run good above idle/low RPM. On a 1410 Edelbrock it's fairly easy to remove the top and check the bowls for junk. You might want a gasket on hand before you start in case it tears, but they're pretty tough and can be reused if not torn. |
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Tko87
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Posted: January-14-2020 at 12:51pm |
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So the carburetor is only 7 months old but I understand it could have a problem.... I'll try to be specific as possible...it's starting to even miss at higher RPMs so the problem appears to be getting worse... I will definitely do what you told me to do..
definitely backfires when first giving it gas. But then there is also a steady Miss... |
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Tko87
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Posted: January-14-2020 at 3:33pm |
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well boys decided to pull off the valve covers and not good news to broken pushrods and 3 bent pushrods and water in the oil on the port side... With a 350 engine mount in the same place as the 454?
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KENO
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Posted: January-14-2020 at 6:29pm |
Well at least you found the problem A 350 will swap in easily if that's what you want to do. The mounts are the same and the position on the engine is the same too. The bellhousing is the same and if they both rotate the same direction, there's a good chance the starter from the 454 will work too. The flywheels won't interchange but if you get a 350 flywheel with the same diameter/number of teeth as your 454 you should be good. That would probably be a 14 inch flywheel. The damper plate will swap from one to the other, but if it's old you may want to swap it while things are apart. The Borg Warner 72C will work with no problem with the 350. And of course the exhaust manifolds are completely different The distributor will interchange though with no issues. That's kinda a quick overview., you'll have some research to do depending on the year of the 350. And don't worry.........somebody will want to know why you don't want to fix the 454 but that's your decision. |
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Tko87
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Posted: January-14-2020 at 7:05pm |
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You are awesome. The reason is, and tell me if this makes sense. I will have a lot more room to work with the 350 when something goes wrong.... I can get a complete 350 engine for much cheaper. Cost really isn't that big of an issue but these books did come with a 350 to begin with ( I think )
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Tko87 wrote: