Blowing smoke! - Chevelle Tech
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post #1 of 13 (permalink) Old Nov 11th, 19, 2:00 PM Thread Starter
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Blowing smoke!

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


Steve
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post #2 of 13 (permalink) Old Nov 11th, 19, 3:58 PM
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Glen
 
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Re: Blowing smoke!

I had a similar problem, it was my teflon valve stem seals leaking. I went with the viton seals and that fixed my oil burning problem.

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post #3 of 13 (permalink) Old Nov 11th, 19, 4:12 PM
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Re: Blowing smoke!

Has the car been sitting for a while since you last drove it ? Is the weather getting cold ? I have seen condensation build up in an exhaust system and take quite a while to totally burn out. How far did you drive it ? Enough to get it good and hot ?

Bill Koustenis
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post #4 of 13 (permalink) Old Nov 11th, 19, 5:11 PM Thread Starter
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Re: Blowing smoke!

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!!
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post #5 of 13 (permalink) Old Nov 11th, 19, 5:53 PM
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jeff
 
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Re: Blowing smoke!

Quote:
Originally Posted by BillK View Post
Has the car been sitting for a while since you last drove it ? Is the weather getting cold ? I have seen condensation build up in an exhaust system and take quite a while to totally burn out. How far did you drive it ? Enough to get it good and hot ?



This right here. ^^^


Condensation in the exhaust will be caused by short trips and high humidity.
This is why many new cars you see drip water out of the exhaust.
There are small weep holes in the mufflers to allow it to drain out.
The performance mufflers we usually use on our cars do not always have weep holes.


So once you get the heat finally built up in the exhaust it will let the water evaporate and turn to steam.


Want to know if it was water or oil smoke.
Oil smoke will linger for a long time drifting down the street.


Water Vapor will dissipate quickly.


Think about burning oil in the skillet how long it smokes up the house.
And now think about boiling water.. the steam on the water is gone after a couple feet.
71350SS and potent rodent like this.
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post #6 of 13 (permalink) Old Nov 12th, 19, 7:39 AM Thread Starter
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Re: Blowing smoke!

Car was not sitting for awhile. Actually went to a car show the day before and everything seemed ok.
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post #7 of 13 (permalink) Old Nov 12th, 19, 9:05 AM
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Jeff
 
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Re: Blowing smoke!

Quote:
Originally Posted by eagleguy View Post
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!!
If you want your motor to last, make sure it is fully warmed up before taking the engine up into high rpm range. It puts a lot of strain on things when they are cold or just warm and your calling for full power.
I see people pulling out of car cruises all the time running cold engines up to 5 or 6 grand then wondering why they need a rebuild a few months later..

Every now and then my 454 will omit some blue smoke when started cold, it goes away. I think its possible for the ring gaps to randomly line up and leak oil into the chamber..
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post #8 of 13 (permalink) Old Nov 12th, 19, 9:59 AM Thread Starter
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Re: Blowing smoke!

I understand. I did let it warm up for a bit even in Florida. LOL
When it was first started and at idle I looked for smoke and saw none, then I rechecked for leaks again nothing.
I am hoping its something easy like a bad PCV or trans modulator. Easy enough to find out.
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post #9 of 13 (permalink) Old Nov 12th, 19, 6:04 PM Thread Starter
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Re: Blowing smoke!

Just started the car up after I changed the PCV valve. Still no smoke, NOTHING! Bought a new transmission modulator which I will install shortly. I am stumped!
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post #10 of 13 (permalink) Old Nov 12th, 19, 9:54 PM
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Steve
 
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Re: Blowing smoke!

What color was the smoke when it did it the first time? Also, how far had you driven before the smoke started?

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post #11 of 13 (permalink) Old Nov 13th, 19, 8:05 AM Thread Starter
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Re: Blowing smoke!

I believe the smoke was white. It happened about a mile into driving then continued until I got home.
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post #12 of 13 (permalink) Old Nov 13th, 19, 10:19 AM
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Re: Blowing smoke!

Check intake bolts?
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post #13 of 13 (permalink) Old Nov 16th, 19, 9:49 PM
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Bill R
 
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Re: Blowing smoke!

Generally speaking,

White smoke is condensation or coolant, blue smoke is oil and dark or black smoke is fuel mixture (too rich).

Bill
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