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Blowing smoke in 1970 Chevelle #5264147 11/11/19 12:05 PM
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007 Offline OP
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First let me say that I have posted the below thread in a Chevelle site but still value the opinions here.

I took my 1970 Chevelle SS 396 out today and I thought I was running rather well. All of a sudden I was blowing LOTS of smoke out the rear from I believe both sides. I pulled over and saw noting leaking and my mechanical gauges indicated oil pressure and engine temp were fine. I got the car home and the smoke seemed to minimize and then disappear at idle. I let the car sit for a bit and it leaked nothing before I put her in the garage. When she was warm but not cold I checked the fluids and all was OK. No signs of oil in the water or water in the oil. All coolant and fluid levels are spot on. Engine is NOT making any noises but did puff smoke on second start up. What gives? What should I be checking??



Thanks

Re: Blowing smoke in 1970 Chevelle [Re: 007] #5264161 11/11/19 12:20 PM
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Chris142 Offline
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Oil level too high? Oil drain back holes in the heads plugged up?


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Re: Blowing smoke in 1970 Chevelle [Re: 007] #5264162 11/11/19 12:20 PM
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ted s Offline
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rich fuel mix smoke

Re: Blowing smoke in 1970 Chevelle [Re: 007] #5264164 11/11/19 12:21 PM
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ted s Offline
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my brother used to live on rt 27 south of clermont

Re: Blowing smoke in 1970 Chevelle [Re: 007] #5264174 11/11/19 12:32 PM
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I was thinking maybe the carb as well as I even checked the PVC valve and it was OK. The car has an almost brand new Edlebrock Thunder 1806 series carb on her which SEEMS to work fine except for my wonderful gas mileage. LOL

That said I was blowing some SERIOUS smoke. So bad that I pulled over!

Re: Blowing smoke in 1970 Chevelle [Re: 007] #5264182 11/11/19 12:47 PM
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Bottom_Feeder Offline
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White smoke or blue smoke?

Re: Blowing smoke in 1970 Chevelle [Re: 007] #5264183 11/11/19 12:47 PM
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mk378 Offline
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What color smoke?

Bottom_Feeder beat me to it. Generally
white = coolant
black = excessive fuel
blue / white = oil

Last edited by mk378; 11/11/19 12:48 PM.
Re: Blowing smoke in 1970 Chevelle [Re: 007] #5264198 11/11/19 01:04 PM
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Automatic transmission vacuum modulator?

Re: Blowing smoke in 1970 Chevelle [Re: 007] #5264230 11/11/19 01:34 PM
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I want to say white smoke.

Re: Blowing smoke in 1970 Chevelle [Re: wag123] #5264246 11/11/19 01:49 PM
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Chris142 Offline
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Originally Posted by wag123
Automatic transmission vacuum modulator?

I had forgotten about those!


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07 fjcruiser Car lube plus 10w30
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Re: Blowing smoke in 1970 Chevelle [Re: 007] #5264271 11/11/19 02:16 PM
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ragtoplvr Offline
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I think the 396 should have a TH400, no vacuum modulator.

Quadrajet on ethanol fuel is famous for float getting fuel logged and sinking.

Used to be so common I had a scale. I have not seen it in years.

Rod

Re: Blowing smoke in 1970 Chevelle [Re: 007] #5264272 11/11/19 02:16 PM
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ragtoplvr Offline
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I think the 396 should have a TH400, no vacuum modulator.

Quadrajet on ethanol fuel is famous for float getting fuel logged and sinking.

Used to be so common I had a scale. I have not seen it in years.

Rod

Re: Blowing smoke in 1970 Chevelle [Re: ragtoplvr] #5264278 11/11/19 02:21 PM
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Originally Posted by ragtoplvr
I think the 396 should have a TH400, no vacuum modulator.

Quadrajet on ethanol fuel is famous for float getting fuel logged and sinking.

Used to be so common I had a scale. I have not seen it in years.

Rod



Did not have any smoke for a year or more since I owned the car and I have made no modificatons. It is a turbo 400. Any suggestions?

Last edited by 007; 11/11/19 02:23 PM.
Re: Blowing smoke in 1970 Chevelle [Re: 007] #5264296 11/11/19 02:39 PM
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What oil is in it? Did you recently change the oil? Is this new smoking problem after any recent maintenance?


2019 Honda CRV 1.5T factory bulk
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Re: Blowing smoke in 1970 Chevelle [Re: 007] #5264319 11/11/19 03:04 PM
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Just started the car up, no smoke. Backed out my driveway and hit her hard. Other than the tire smoke, nothing. Took her on the road and hit her hard getting on and off the gas, no engine noise, nothing! What the heck!!

Last edited by 007; 11/11/19 03:05 PM.
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