FORD V8 Engines: The Elusive Electrical Gremlin - Reginald A. Craig

FORD V8 Engines: The Elusive Electrical Gremlin - Reginald A. Craig

You may think a car starts with the key, but when you twist the metal collar on the steering column a synchronized operation of components merge elements together that ignite rapid-fire controlled explosions. The Internal Combustion Engine (ICE) requires three primary sources to work; Air, Fuel and Spark. Each resource is delivered by different methods. However, each exhibit there own failure symptom when a problem arises.


Today we are focusing on electrical, more precisely; The Ignition System.


My 1980 Continental Mark VI is equipped with a Carbureted 5.8L Ford 351 Windsor V8 engine. Recently I resolved a problem with the failed Ignition System. Over the course of several months I performed a series of part replacement trial and error sessions. The process started with recalling the symptoms and to track if the behavior would repeat.


Before I proceed it is necessary for me to interject that prior to the vehicle's failure, it gave me little to no warning. In hindsight I now realize some subtle indications were evident leading up to this point. Therefore I hope communicating my experience will save you the trouble.


If you too have an old car manufactured before On-Board Diagnostic (OBD2) ports became standard, you’ll need to become familiar with distinguishing what type of problem is being presented. First what you have to remember is electrical problems generally go out like a light switch. Either a connection has a short exhibiting intermittent operation, or a total burnout. Whichever the case, symptoms are noticeably different compared to a mechanical failure.



Process of Elimination:


If you’re on a tight budget like me and attempt to do your own project car repairs, please listen up! Before you dive-in headfirst, read online automotive forums and search symptoms that may validate your hunch. Narrow down part replacement(s) associated with the problem category; Electrical in this case. Practice patience and start with the most probable cause. Online there will be a multitude of accurate and misguided advice, so stay focused and follow your intuition. I know all this sounds obvious, but patience will save you frustration and money.



What SINGLE Part Specifically Failed On My Car???


Reference Sensor - Crank / Engine Crankshaft Position Sensor (Crank Pickup)

Brand: PartCatalog

Manufacturer Part Number: PC-859918

Amazon ASIN: B0CK74KN9V

Symptoms Before Diagnostic Confirmation:


1.) Abrupt engine shut off after confident 10 minute idle; went from running great to cold turkey.

2.) Wouldn’t turn back on for several hours, eventually degraded to several days wait.

3.) Exact same behavior cycle for weeks and then ZERO, only starter-motor cranking engine.

4.) Every time I return the key towards the off position, the engine gave a delayed partial turn.


Note: The only subtle indication that this problem began forming was an increase in prolonged startups.



Installation Location and Tools Needed:


11mm Socket (1 Bolt securing U shape clip)

Flathead Screwdriver - Optional (unlatch 2 plastic housing connectors)



All connections and installation is performed from the passenger side of the Engine Bay. Original Equipment Manufacturer (OEM) sensor is installed next to the Harmonic Balancer. New replacement sensor must be fully inserted and secured using original hardware. Wiring routes up-top and is connected into two plastic housings resting under the edge of the Carburetor Air Cleaner. 




Tips: To unplug plastic connection housings, carefully use Flathead Screwdriver to release tension on latch. Next follow-through with hands and pull apart both halves of housing to separate. Everything is located and accessible from the passenger side of the engine bay.




Part Replacement Bloopers


First Attempt = Ignition Coil & Boot Wire

Second Try = Distributor Cap & Rotor

Third Turd = DURASPARK Ignition Module

Forth and Down = New Spark Plugs


One thing is for sure. The extra repairs will make my car that much more reliable. No effort has gone to waste. The trial and errors I endured to finally diagnoses my project car accurately gave me a greater appreciation for engineers who’ve evolved the automotive industry. It also reminded me how important the car enthusiast community is and the wealth of information shared. I’d like to give a special thanks to Jake Jackson-Dout from Marks of Distinction, for your expertise.




PS... Click below to read my previous Blog:

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Special Thanks:

@MarksofDistinction


Marks of Distinction

https://www.youtube.com/@MarksofDistinction


Location: Michigan, USA

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