Cylinder Compression Am I Screwed

[ruckin69]

Yeah it did sit and it suddenly showed up this summer. The next 2 items to look at are timing and a carb rebuild it's a 390 cfm 4 barrel if that matters. Here is a new video. The rattling was fixed be a washer shimming the radiator. Heres a new video with new plugs. Damn pully still is wobbling after a new balancer. Very frustrating.

https://youtu.be/OaR-ySuCzUI

 

[Wyflyer]

Your compressions are ok, focus on the carb and ignition.

 

[blubuckaroo]

Maybe you can source a crank pulley from someone who has added power steering and/or A/C.
When does it stall? Whenever in gear, or when accelerating? I'm wondering about the health of the fuel suction lines and/or fuel pump.
You have a clear fuel filter that looks like it has a lot of bubbling.
A leak in the suction line may not leak fuel, but allow air in, breaking the fuel pump's prime.

 

[ruckin69]

Maybe you can source a crank pulley from someone who has added power steering and/or A/C.

When does it stall? Whenever in gear, or when accelerating? I'm wondering about the health of the fuel suction lines and/or fuel pump.

You have a clear fuel filter that looks like it has a lot of bubbling.

A leak in the suction line may not leak fuel, but allow air in, breaking the fuel pump's prime.

It stalls when in gear and I let the gas off and driving. I was thinking it could also be the fuel pump too but how can I test it? It does come into the filter but I dont know how I can determine if its enough or not.

Sent from my SM-G950U using Tapatalk

 

[blubuckaroo]

It stalls when in gear and I let the gas off and driving. I was thinking it could also be the fuel pump too but how can I test it? It does come into the filter but I dont know how I can determine if its enough or not.

Sent from my SM-G950U using Tapatalk

If you've got an automotive vacuum gauge, they usually have a fuel pump pressure scale and a vacuum scale for fuel pumps as well.

 

[Dirtroadjunkie]

Sounds like it could be the the low speed idle jets= to a vehicle sitting and today's fuel. I'd spend my dollars on a new carb. Honesty todays fuels are non carb friendly. I swap fuels, start up weekly, and sourced E -Free fuel for all of my carb equipment.

 

[ruckin69]

So I decided to give it to the mechanic and he found 2 things. Number one the fuel pump was going bad and number 2 when he bypassed the fuel tank switching valve it worked like a charm. SOOOO I'm off to get a valve and rehook it up to see if was the valve or not. He said and I confirm, the motor now runs like a top and I'm back on the road. Thanks all for your help troubleshooting this.

 

[Pa PITT]

... Do you still have that 95lb compression in no1.
I think you should but I just had to ask. I too have driven some old farm trucks with 30 to 40 lbs difference in some cylinders.
As it only takes 70lb to fire the plug . But a weak cyl. should give you a rough idle . I'd not expect to feel it in our Bricks. Maybe in mothers Lincoln But our rides have enough bounce ..
... Good luck

 

[ruckin69]

... Do you still have that 95lb compression in no1.
I think you should but I just had to ask. I too have driven some old farm trucks with 30 to 40 lbs difference in some cylinders.
As it only takes 70lb to fire the plug . But a weak cyl. should give you a rough idle . I'd not expect to feel it in our Bricks. Maybe in mothers Lincoln But our rides have enough bounce ..
... Good luck

I have to retry it with oil in the cylinder but the mechanic was really impressed with how the motor runs and idles and I only drive this truck for joy rides on nice days so it will have alot of life left for me.

 

[Pa PITT]

Yes if that's how you drive it ...
Then all I'd do Is enjoy it .
Glad the old Man Tech found a fixable issue for you.

 

[DirtDonk]

Yep, all good news. And if the engine has been sitting a long time at points, and only driven occasionally on others, and unknown in previous lives, it's very possible that the low compression cylinder will wake up a bit after more driving.
If it ever gets driven even semi-regularly it's likely the compression will improve unless the rings and/or valves are actually worn out from mileage.

Paul