383 Engine Knocking, Sputtering after Shut Off

[BB BELLA]

doesn't matter what carb is doing something in there is igniting the fuel, get the carbon out ,could try a colder plug see if thats the issue!

 

[Milo]

Try some top tier fuel

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[Mr. PNW]

Have you tried a higher grade fuel/octane rating non ethanol fuel. May be as simple as that!

Premium fuel and Ethanol Defense make my cars run much better. I get my ED direct but I also noticed Mike’s Carburetors shows it with their carb kits.

 

[Tyron68]

Have you tried a higher grade fuel/octane rating non ethanol fuel. May be as simple as that!

I JUST started putting 91 Octane in. I was putting 87 in it. Have only started once since then though.

 

[Tyron68]

^^^^ I usually do this every year or so. Gently pour, don’t kill it.

So how much do I pour in it? This ice/snow has gotten me behind.

 

[RemCharger]

I JUST started putting 91 Octane in. I was putting 87 in it. Have only started once since then though.

This changes things. 87 is great for pieces of junk you drive alot everyday. A classic deserves that little bit extra per gallon..

 

[Jerry Hall]

Considering regular fuel was 90 plus octane when the car was new, that's a good move. It will improve your performance to original standards now when tuned correctly. Non ethanol fuel will help also.

 

[Armyvet25]

So how much do I pour in it? This ice/snow has gotten me behind.

rev the engine by hand, pour it in until it starts to bog, back off water till rpm's resume continue till it takes about a normal water bottle revving it up to higher rpms but obviously don't over tach it, you'll see the carbon afterwards having exited the exhaust. you're not trying to idle it through but normal carb revving to keep it running, the water super heats and steams blast the carbon off the valves and the top of the pistons

 

[oldbee]

rev the engine by hand, pour it in until it starts to bog, back off water till rpm's resume continue till it takes about a normal water bottle revving it up to higher rpms but obviously don't over tach it, you'll see the carbon afterwards having exited the exhaust. you're not trying to idle it through but normal carb revving to keep it running, the water super heats and steams blast the carbon off the valves and the top of the pistons

Exactly right^^^^, don’t stall it out!

 

[Tyron68]

This changes things. 87 is great for pieces of junk you drive alot everyday. A classic deserves that little bit extra per gallon..

I have another charger, a 68, that I have had for about 6 years. I have been putting 91 octane in it since

Exactly right^^^^, don’t stall it out!

ok well, now I have to ask why that’s bad??

 

[Armyvet25]

ok well, now I have to ask why that’s bad??

not bad, just counter productive, you need the engine running to blast off the carbon, why it requires revving the engine while you pour, can't burn water lol

 

[Tyron68]

not bad, just counter productive, you need the engine running to blast of the carbon, why it requires revving the engine while you pour, can't burn water lol

Ok. Just making sure it was nothing catastrophic lol.

 

[pro451bee]

What is base timing at idle ? make sure the vac advance is off at idle and turn up the base timing to bout 15deg and close the throttle blades to slow idle back down

 

[oldbee]

Ok. Just making sure it was nothing catastrophic lol.

IF you stall it out, it could hydraulic lock from water on top of a piston/s. If it slows down too much, just stop dribbling the water in for a second or so to let rpm’s come back up. Your just trying to make some steam and water droplets to break up the carbon.

 

[1967coronet]

Called dieseling...carbon build up in the combustion chamber glows red and continues to fire even after ignition/fuel shut off, due to usually over rich conditions leaving carbon on piston and valves built up over time. Adjust carb, start and run the car, while running go under hood, pour water from a regular drinking bottle of water slowly down the carb revving as necessary to keep car running, will steam off excess carbon.

Yes ^^^^, plus you want to do that water cure outside

 

[Rishi]

So how much do I pour in it? This ice/snow has gotten me behind.

1 gallon water

 

[Tyron68]

Well, the water in the carb thing worked. Thanks for the feedback guys. Greatly appreciated. Now on to the next issue......