Spark, Fuel, Crank but won't start

[mqbaity]

Hello everyone forgive me if this is in the wrong place. Me and my pawpaw recently pulled his dads 76 K10 out of storage after almost 10 years. Threw a new tank, sending unit, fuel filter on and fired up like it had never stopped. After a couple trips around town after warming up the truck would occasionally act sluggish and jerky but would usually stop after a minute or two until finally it sputtered out in park and would not start again. It will crank all day but will not run, have been watching a bunch of revival videos lately since while I'm not new to technical work I am very new to mechanical work if that makes sense. And I know you need spark, fuel, and air so my first instinct was spark since some of the plug wires had seen better days. I've replaced the distributer cap, rotor, plug wires, and plugs and have visually verified that fuel is being sprayed into the carburetor as well have in-line tested the plug wires. All seems to be in order and yet it will not run even on starting fluid, will occasionally sputter but that is all. Very confused since it went from running well to not at all. Any help appreciated thank you.

 

[rusted nuts]

Yuo need spark at the right time,, check to see if you have spark at the right cly at the right time could be a timing chain

 

[mqbaity]

How would I check that? I’ve seen people use timing lights but I thought it had to be running to check that way?

 

[rusted nuts]

You pull No 1 plug,, turn engine over by hand till piston is at top dead center on compression stroke then see if rotor is pointing at No 1 plug on dist cap.

 

[mqbaity]

Thank you, have to work tonight but may have time before going in to check will post back with results

 

[Ricko1966]

How did you verify spark?

 

[mqbaity]

I put an in-line tester at the end of several plug wires and they all lit up strong.

 

[Ricko1966]

Take a negative jumper cable hook it to ground,clamp an old plug in the other end open the gap up to about .090 put a plug wire on the plug and check for spark.

 

[Copymutt]

Time for a basic compression test.

 

[Ricko1966]

Okay this is just my feelings,but it wouldn't stumble stall restart run awhile,run good run bad. Because of a timing chain, it d8dnt run good,lose compression run bad regain compression run good and die now not have not enough compression to start. I would believe the carb needs work and it would flood and now it's flooded,I would believe a coil or module was failing and his inline spark tester would light with a lawn mower coil. Really IDK but losing compression all the sudden or intermittent timing chain failure aren't on the top of my list.

 

[Memaloose]

I immediatley thought of a faulty ignition module. Usually they fail 100% but it couldn't hurt to check.

 

[rusted nuts]

Thank you, have to work tonight but may have time before going in to check will post back with results

let us know what you find,, good luck.

 

[mqbaity]

Ok fellas I got of work and checked both things. The old spark plug sparked just fine when hooked up and the rotor pointed to #1 at TDC. Any thoughts?

 

[mqbaity]

In regards to flooding I also pulled several plugs to check if they had gas on them and none did

 

[Rusty Nail]

You'll get more help if you post a pix of the "76 k10" . I dont even think you really got one JUNIOR.

Look kid... You pay first AND THEN ask question. Mmmkay?

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