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Smokes after idle...
Topic Started: Jul 26 2012, 10:57 PM (1,391 Views)
Coche Blanco
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270,000 miles. 15,000 miles ago I honed it, installed new rings, and threw a fresh head on it. Just recently, after it idles down to 1,000 RPMs or so, and when I rev it back up it smokes. It goes away once I get over that engine speed.

What gives? I understand that I need to go oversize on the pistons and do it, "the right way" but I just don't get why it would smoke at those exact parameters.

:stoner
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allmountain40
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What color is smoke? If its grey, sounds like you may be fouling your plugs when it idles down and your just blowing excess fuel out when you rev it back up. When was the last time you did a tune-up? If its blue, your rings are toast. :thumb
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Memphis metro


Who rebuilt the head? Did it have new valve seals installed?
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Coche Blanco
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Some guy from eBay. I have never really trusted that it was rebuilt the right way, so that might be the problem.
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Coche Blanco
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allmountain40
Jul 26 2012, 11:57 PM
What color is smoke? If its grey, sounds like you may be fouling your plugs when it idles down and your just blowing excess fuel out when you rev it back up. When was the last time you did a tune-up? If its blue, your rings are toast. :thumb
I'll have to see what color it is in the daytime, it was too dark last night to really tell.
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Shinrin
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Wild theory

Leaking fuel injector. At low rpms(idle) the fuel drip exceeds handleable amounts, building up in the tbi. You open the throttle a little, the fuel dumps into the engine and comes out as unburnt smoke. You give it more throttle, the amount of air it takes equalizes the extra fuel and it burns.
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Coche Blanco
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I can't really tell what color it is, and it seems to only do it after idling a bunch. i.e. redlights and drive thrus. I'll see if I can make a lot of the smoke to see if its color.
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Old Man


find a long hill. going down the hill let up on the gas all the way down. at the bottom of the hill down shift and hit the gas hard. if it is bad valve seals you will get a cloud of smoke when you hit the gas.
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Coche Blanco
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Old Man
Jul 27 2012, 04:01 PM
find a long hill. going down the hill let up on the gas all the way down. at the bottom of the hill down shift and hit the gas hard. if it is bad valve seals you will get a cloud of smoke when you hit the gas.
I remember you saying this a while back, and I did it today, no smoke. So valve seals should be out of the question.
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Coche Blanco
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For whatever it's worth, it smoked one time today, at initial startup. But of the other 40 times I started it, nothing.
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Old Man


Coche Blanco
Jul 27 2012, 09:58 PM
For whatever it's worth, it smoked one time today, at initial startup. But of the other 40 times I started it, nothing.
very small water leak to the combustion chamber?? Only shows up after it sits for a while?----------have you noticed a small drop in your coolant level over time?
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Shinrin
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I'm sticking with my injector guess that's based on my wild guessing

When you shut it off for the night, the injector leaks all the leftover fuel out over time, so when you first start it coughs up that extra gas.
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Coche Blanco
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Old Man
Jul 28 2012, 12:26 AM
Coche Blanco
Jul 27 2012, 09:58 PM
For whatever it's worth, it smoked one time today, at initial startup. But of the other 40 times I started it, nothing.
very small water leak to the combustion chamber?? Only shows up after it sits for a while?----------have you noticed a small drop in your coolant level over time?
Very well could be that. I'll have to take note of my water level more often. My distributor cap had some buildup in ne spark plug terminal. That may cause a misfire/plug fouling.
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Bad Bent
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How's the PCV valve looking? Oil in the air filter? :dunno
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Coche Blanco
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Pcv valve is gewddd
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