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Old 02-26-2021, 11:31 AM   #1
BessieBlue
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Default Engine spewing smoke out exhaust.

I replaced the oil separator and flame trap, but at this point, I don't know what else it could be. Any troubleshooting help would be much appreciated.
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Old 02-26-2021, 12:14 PM   #2
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Head gasket? are you loosing coolant, rings shot, do a leak down.
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Old 02-26-2021, 12:18 PM   #3
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What color is the smoke?

White or light gray is usually coolant related, so likely the head gasket or in the worst case a cracked block or head.
Black is fuel, so the car would be running too rich. It will also probably smell like gas and your mileage will be crap.
Blue or blueish gray is engine oil. This would mean bad piston rings or oil leaking down through the valve guides. Although I could see this also being a head gasket if the part around an oil channel went.

When does it smoke? Acceleration, deceleration, cruising, or idle?

There are a lot of different conditions that can cause a car to smoke out the exhaust but you can tell based on the color of the smoke and what conditions result in smoke.

I don't think the PCV system would result in smoke unless you are getting really nasty blow by.

How does the oil look and is the consumption worse than normal? As 283SD mentioned, how is the coolant level over time? Is there any crap in the coolant?

What car? I assume it is the '84 245 you mention in your post history. So I am guessing a B23 motor.
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Old 02-26-2021, 04:28 PM   #4
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It's pretty blue-gray. I realized I didn't clean out the vacuum nipples when replacing the pcv, I'll try that and see if it clears up the problem.

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What color is the smoke?

White or light gray is usually coolant related, so likely the head gasket or in the worst case a cracked block or head.
Black is fuel, so the car would be running too rich. It will also probably smell like gas and your mileage will be crap.
Blue or blueish gray is engine oil. This would mean bad piston rings or oil leaking down through the valve guides. Although I could see this also being a head gasket if the part around an oil channel went.

When does it smoke? Acceleration, deceleration, cruising, or idle?

There are a lot of different conditions that can cause a car to smoke out the exhaust but you can tell based on the color of the smoke and what conditions result in smoke.

I don't think the PCV system would result in smoke unless you are getting really nasty blow by.

How does the oil look and is the consumption worse than normal? As 283SD mentioned, how is the coolant level over time? Is there any crap in the coolant?

What car? I assume it is the '84 245 you mention in your post history. So I am guessing a B23 motor.
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Old 02-26-2021, 05:40 PM   #5
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It's probably a head gasket, which means a head ache for me...
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Old 02-26-2021, 05:45 PM   #6
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Quote:
Originally Posted by BessieBlue View Post
It's pretty blue-gray. I realized I didn't clean out the vacuum nipples when replacing the pcv, I'll try that and see if it clears up the problem.
Does the coolant level or oil level drop? What happens to the smoke when you accelerate and what happens when you decelerate? Does it just spew smoke at idle?
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Old 02-28-2021, 12:30 PM   #7
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It was fine for about 60 feet and then started spewing from accel. Now it is doing it when I start the car as well. I'm leaking fluid at the front left corner of the car.


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Does the coolant level or oil level drop? What happens to the smoke when you accelerate and what happens when you decelerate? Does it just spew smoke at idle?
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Old 02-28-2021, 03:31 PM   #8
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You'll want to do a compression test and see what's happening internally.
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Old 02-28-2021, 05:42 PM   #9
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Thanks. I found a hose that was loose, coming from the top of the air control valve housing and forward under the crossmember. Could this have caused the smoke?
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You'll want to do a compression test and see what's happening internally.
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Old 02-28-2021, 06:56 PM   #10
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Where exactly are both ends of this mystery hose connected?
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Old 02-28-2021, 07:02 PM   #11
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Quote:
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Where exactly are both ends of this mystery hose connected?
^ this because there shouldn't be a hose that goes from either of those places to the other.

Also what's the mystery fluid leaking from the front corner???
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Old 02-28-2021, 07:45 PM   #12
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Top of the air control valve, then down to the front left corner, where there's a black, plastic cylinder. A friend said maybe a charcoal filter or something. It right in front of the left wheel well.
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Where exactly are both ends of this mystery hose connected?
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Old 02-28-2021, 08:57 PM   #13
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That is the charcoal canister for the vapor emissions. It's supposed to have two hoses going to it from the throttle body. I presume that is what you are calling the air control valve. The canister gathers the vapors from the gas tank and a valve on the top opens when the engine is running to burn the fumes.
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Old 03-01-2021, 11:19 AM   #14
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Fpr?
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Old 03-01-2021, 02:06 PM   #15
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1929 REO Speedwagon?
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Old 03-01-2021, 02:24 PM   #16
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What are the characteristics of the mystery fluid (color, smell) leaking from the car? Any smell from the exhaust? I've found burning engine oil (indicated by blue/gray smoke) to have a distinctive smell. You can also check the spark plugs. Include a link to a picture of the plug tips and we can help you figure out what is going on.

dl242gt is right. A compression test is in order.
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Old 03-01-2021, 02:40 PM   #17
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What are you looking for in the compression test?
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Old 03-01-2021, 03:04 PM   #18
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A bad head gasket. Or, a worn cylinder sucking in oil to burn.
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Old 03-01-2021, 03:43 PM   #19
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Quote:
Originally Posted by dl242gt View Post
A bad head gasket. Or, a worn cylinder sucking in oil to burn.
I was always taught that blue/gray smoke on acceleration meant valve guides/seals.

Although it sounds like OP's problem got worse since it happens at idle now. Might be a head gasket.
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Old 03-01-2021, 05:16 PM   #20
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Smoke on acceleration is usually more mixture related. It's the smoke on decel when the engine has high vacuum that oil get sucked past worn guides and seals. Although with a clogged pcv system you can get oil smoke at any time but especially on decel.
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Old 03-06-2021, 10:59 AM   #21
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Start with the cheap (inspect and clean PCV calve, find where all hoses go, etc) before going to head removal?
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Old 03-18-2021, 06:36 PM   #22
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+1 for head gasket
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Old 03-18-2021, 10:00 PM   #23
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A customer recently brought us his 240 that was smoking really badly and especially under acceleration.

Turns out he had “topped off the oil” by adding 5 qts. Did you do that?
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Old 03-19-2021, 04:15 AM   #24
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Quote:
Originally Posted by ortho stice View Post
A customer recently brought us his 240 that was smoking really badly and especially under acceleration.

Turns out he had “topped off the oil” by adding 5 qts. Did you do that?
Those darn charcoal canisters, what to do ?

How about start by giving more information about the car(is it the 84 245?),

b) mileage on car ?
c) what is leaking and from where ?(photos/or a link for pics)
d) photo showing what your oil looks like on the dipstick? Are you losing oil ?
e) photo of one or all your spark plugs could be very helpful in diagnosing the issue
f) inform us if the spark plugs are new


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Old 03-19-2021, 03:38 PM   #25
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OP hasn't logged in since 2/28.
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