White Smoke And Water Has Been Coming Out Of 1983 C20 Dually Carburated 454

[blackandgold51]

Got a 454 in a 1983 c20 4 door dually that is carburated.True cat dual exhaust with no catylitic convertor and Longtube headers.

When idling hot it blows out white smoke and water. But no blue smoke and black smoke

 

[b454rat]

Condensation....

 

[blackandgold51]

Condensation....

I thought so, wanted to make sure because a guy I know that is a tow truck driver thought something was bad . I told him the same thing like you said and what I posted however he thinks other.

Although it been happening since summer

 

[rampage]

Does the exhaust smell like coolant?
Perform a leak down test.

 

[blackandgold51]

Does the exhaust smell like coolant?
Perform a leak down test.

I'll warm it up in a few since I got to go somewhere and see.

Last time I smelled it , it smelled liked gasoline

 

[1-ton]

White smoke is not a good thing. It is a sign of a blown head gasket. You can get a cheap "specific gravity" tester from most auto parts stores that can tell you if you have excessive oil or gas carbons in your coolant system. Your heads and block are probably OK because those old Chevy 454's where not known for being crack prone, unless someone thrashed the sh!t out of the engine.

 

[blackandgold51]

White smoke is not a good thing. It is a sign of a blown head gasket. You can get a cheap "specific gravity" tester from most auto parts stores that can tell you if you have excessive oil or gas carbons in your coolant system. Your heads and block are probably OK because those old Chevy 454's where not known for being crack prone, unless someone thrashed the sh!t out of the engine.

I'll get tlhe tester when I go to AutoZone in a few minutes. I give to take something back there anyways

 

[blackandgold51]

Does the exhaust smell like coolant?
Perform a leak down test.

As the vehicle of now is idling and warmed up no white smoke , clear and smells like gas.

I'll drive it to AutoZone and see if it smokes when I'll let it idke there

 

[blackandgold51]

Update : I just got to AutoZone and it's idling and still no white smoke

 

[blackandgold51]

Update: After letting it idle in the parking lot I reved the motor a few times while idling after letting the motor settle in idling no smoke still

 

[blackandgold51]

Update: I got back to the vehicle after leaving out of AutoZone and is letting it idle. It was idling high earlier but after a few revs the idle slowed down to normal speed idle and is now blowing white smoke.

 

[rampage]

Still smell like gas or coolant?

 

[blackandgold51]

Still smell like gas or coolant?

Update : while I was the store of advance Auto parts looking for a little switch for to headlights, I asked the store manager about the emissions tester. They said they don't sell those but instead go to am auto repair shop to have it tested.

He asked me what was the problem, i told him everything and he said it should be the caburater dumping fuel and suggest a fuel injection system after I said I migt as well change it to fuel injection since I'm getting it to fuel inhinjection installed anyway.

 

[rampage]

How’s the coolant level/color? Any bubbles in coolant?
Sounds to me like a blown head gasket, fouling a spark plug and making exhaust smell like gas.

 

[blackandgold51]

How’s the coolant level/color? Any bubbles in coolant?
Sounds to me like a blown head gasket, fouling a spark plug and making exhaust smell like gas.

I checked the coolant color it's green

Ill check it again shortly

 

[blackandgold51]

How’s the coolant level/color? Any bubbles in coolant?
Sounds to me like a blown head gasket, fouling a spark plug and making exhaust smell like gas.

Speaking of spark plugs, i told that guy at the shop to change all the spark plugs, not just a few.

This was a couple of months ago when i head the headers repaired and welded at the muffler shop of a guy i know

 

[blackandgold51]

How’s the coolant level/color? Any bubbles in coolant?
Sounds to me like a blown head gasket, fouling a spark plug and making exhaust smell like gas.

I see white bubbles while the vehicle is idling , when shut off color is green when idling color is orange and green looking

 

[K5wrench]

If it is a blown head gasket, and the white smoke was coolant, you'd be losing coolant over time.

Has the coolant level been declining?

A head gasket that leaks can do this when hot but seem normal when cold.

There is a test kit you put over the radiator fill opening that can detect a blown head gasket.

As for dumping too much fuel; black smoke, and stinks combined with poor driveability.

Other possible sources of white smoke can be a bad Positive Crank case Ventilation valve or PCV valve.

Or sucking brake fluid from the master cylinder through a bad brake booster.

Valve stem seals, but that smoke is usually blue, and would be most evident after prolonged deceleration followed by acceleration.

I would check ALL the fluid levels.
Make notes.
Then recheck them after a period of 50 to 100 miles should do the trick.

If you are losing a lot of fluid from one source, might be a clue.

If nothing has lost fluid, maybe it is leaking gas through bad swage plugs in the carburetor (common on q-jets), or a blown power valve (common on Holley) or just some damn gasket in the carb.

Maybe start by checking and re checking all the fluids over time to see if something is leaking.
Don't forget power steering level and check hoses for leaks.
Sometimes a power steering leak can spray a fine stream right onto the exhaust and the smoke be blown out under the truck by the radiator fan and look like it is coming from exhaust.

 

[rampage]

I see white bubbles while the vehicle is idling , when shut off color is green when idling color is orange and green looking

Bubbles=not good ... they’re coming from somewhere
Unfortunately, I stand by my diagnosis.
Pull the spark plugs and see if any are wet.

 

[K5wrench]

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