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Car smoking after oil change
#11
(04-16-2019, 10:59 AM)Mister 4x4 Wrote: I was going to suggest that maybe there was too much oil in the crankcase, but I didn't want to make any assumptions or insult anybody.

I had a friend decide to change his own oil, not knowing anything about his car, he opened up the drain plug he found under the truck and emptied it... then added 5 quarts of oil to the OIL fill in the valve cover.

He'd actually drained his manual transmission, and added another 5 quarts to his crankcase - smoked like a chimney when he fired it up.  Once we dumped all the oil, then refilled both crankcase and transmission, everything was fine.

I'd recommend checking your fluid levels in both the transmission AND the crankcase just to make sure that's not the issue.

Eric, Did you just make that up? HahaChuck
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#12
Thank you all for your feedback! I just got back from Europe, and changed the oil today to VR1 20w50. (5 quarts)

I drove the car around and after about 15 minutes it started to smoke again.  it didnt smoke quite as bad, but definitely still smoked a good amount.  I shut it down and waited 5 minutes and checked the oil level, which read around 4mm below the bottom of the "safe" line, so pretty low.  This doesnt make much sense though because I added exactly 5 quarts of oil when I did the change. There might be a little over 5 quarts in there since there might be a little leftover 5w30 oil, so if anything there is a small bit more than 5 or exactly 5 quarts, so I'm not sure why it would say that the oil is low.  I have never replaced my dipstick so I doubt that it is the wrong one, but I suppose it could be wrong if it got accidentally swapped with a different dipstick at some point, or maybe it got bent and is throwing the measurement off.

I tried smelling the oil at the end of the dipstick to check if I can smell any gasoline, and I did get a small hint of gasoline odor when I smelled the dipstick.  

Should I let some more oil out even though it has 5 quarts, Or is it possible that its just burning off the excess 5w30 oil from the last oil change? Or could it be that there is too much transmission fluid in there after I added the trans-stop-slip? 


again, this car never smoked before I changed the oil to 5w30 and added the trans-stop-slip. I replaced the oil back to 20w50 and its still smoking, so that leads me to believe that it has something to do with adding the stop-slip.  This still doesnt explain the low oil level reading on the dipstick though- or the slight gasoline smell on the dipstick.  


Sorry for the long post, I just want to be thorough. Thanks again guys!
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#13
Do not drain any of the oil, the level is not too high, now.

My guess is that the vacuum modulator on the transmission is leaking, and sucking transmission fluid into the engine. The vacuum line for it runs up the back of the engine and connects to a fitting on the top rear of the intake manifold. You can pull the rubber hose off the fitting and check the inside of it for oil.

It's also possible the thin oil coated the inside of the exhaust pipes and when they warm up enough the oil starts to burn off.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
[+] 1 user Likes Don C's post
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#14
It was also mentioned in past that the fuel pump diaphragm might be leaking. This will pump gas into the oil for sure had it happen last year. You can test without pulling the pump off just use a vacuum bleeder hand pump like you use for bleeding brakes. Put pump on the hook up for the hose from fuel line and hold finger over the fitting going to the carburetor. If if will not hold a vacuum the diaphragm has a hole in it and needs replacing. Actually take the pump with you if you need a new one and test the new pump at the store. I have had them bad right out of the box.


When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
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#15
From some replies, I'm confused, it smokes at the exhaust tips too, or just from the engine/bay?

@David,
Would there not be a strong fuel smel when he checks the dipstick?

73 modified Grandé 351C. Almost done. 
71 429CJ. In progress
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#16
Hey everyone! quick status report-

I checked the transmission fluid level while the car was idling and it is overfilled a bit.  I took a photo of the dipstick, and to see it just click this - http://tinypic.com/r/63rfok/9
It is kind of hard to see and the picture is a bit misleading so I added a red line to mark where the top of the fluid level is, and I added a blue line to show where the recommended fluid level should be.

I also noticed some transmission fluid around and underneath the carbon storage canister, not sure how transmission fluid would get there but here are two pictures of that as well-  http://tinypic.com/r/20i73pl/9   -  and  -   http://tinypic.com/r/1079hfl/9   -  that blue thing at the top of the photo is the canister, and all that wetspot is transmission fluid.   It should be known that I did spill some transmission stop slip on top of the canister when adding it, and then I tried rinsing it off (which didn't work too well since its so viscous and oily). so its possible that the spilled fluid never got fully rinsed off and instead just spread further and found its way underneath the canister, which could be what we are seeing in that picture.  I just thought I would include that though because that could be some sort of clue if it turns out that its not just spilled fluid.

Don C, I couldnt find the vacuum line that you were referencing.  I took a picture of the top-rear of my intake manifold and that can be seen here- http://tinypic.com/r/200bc5w/9
I circled the only thing coming out of the top rear of the manifold, but I don't think that line is it, but there are two other nozzles on that thing that are capped off (they have been capped off since I bought the car in 2013).  
The green arrow is pointing to the only other line that is near the rear of the intake manifold, but it isn't attached to the manifold itself so I don't think that is the one you were referencing either.  So if you could help me a little more to find that vacuum line then I will definitely check it ASAP.  

[Image: 200bc5w.jpg]

Carolina_mountain_mustangs , would a leak in the fuel pump diaphragm cause all this smoke to come out of the exhaust and engine bay? The smoking didnt start until after I changed the oil and added the transmission fluid stop slip, so I would be really surprised if the fuel pump diaphragm happened to go bad the moment I changed those other things, since I didn't even touch any part of the fuel system.   Hopefully the fuel pump diaphragm isn't leaking, I replaced the fuel pump not too long ago, probably 3 years ago and put less than 1000 miles on the car since.  I also don't smell that strong of a fuel odor from the dipstick, if any at all.

Fabrice , The smoke is coming from the exhaust as well as the engine bay.  Its also coming out of the exhaust leaks near the muffler too, as you can see by the smoke coming out of the wheel wells in this picture- http://tinypic.com/r/2ynfo8y/9


What do you guys think? Thanks again!

Matt
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#17
The hose the green arrow is pointing to may be it. Can you tell where the metal tube it is connected to runs to? If it is the one it will run down the back of the bell housing and towards the back of the transmission.

To answer the question about the fuel pump, it could draw in oil, as the pump lever moves in one direction it puts pressure against the diaphragm and forces gas to the carburetor (and crankcase when there is a hole in the diaphragm). When it moves in the other direction it pulls fuel into the fuel pump from the fuel tank and could pull some oil in from the crankcase. As much oil as your car is burning, if this were the case I would think the gas in the carburetor fuel bowl would be noticeably oily.

Did you do anything else when you changed the oil, like replace the PCV valve or tighten the intake manifold bolts?



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#18
switch to mobil 1 full synthetic oil  when i started my car after sitting it would smoke changed from pennzoil to mobil 1 no smoke
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#19
(04-16-2019, 11:07 AM)c9zx Wrote:
(04-16-2019, 10:59 AM)Mister 4x4 Wrote: I was going to suggest that maybe there was too much oil in the crankcase, but I didn't want to make any assumptions or insult anybody.

I had a friend decide to change his own oil, not knowing anything about his car, he opened up the drain plug he found under the truck and emptied it... then added 5 quarts of oil to the OIL fill in the valve cover.

He'd actually drained his manual transmission, and added another 5 quarts to his crankcase - smoked like a chimney when he fired it up.  Once we dumped all the oil, then refilled both crankcase and transmission, everything was fine.

I'd recommend checking your fluid levels in both the transmission AND the crankcase just to make sure that's not the issue.

Eric, Did you just make that up? HahaChuck

Wow - Sorry I missed this when you replied, Chuck.  

Actually, I did not make that one up.  The guy with the truck was the husband of one of my Airmen back in '95 - they had a '90-something Nissan 2WD pick-up.  He didn't know squat about cars, just remembered seeing someone under the car and removing a plug when changing the oil.  He wanted to do it himself, but didn't think to get someone to help him for the first time he'd ever done it.  We got it to the Auto Hobby Shop (wasn't more than a mile or so away from the base) and put it on a lift, and he pointed out which drain plug he'd removed, and I immediately knew what happened at that point (I was still learning things myself and had never seen anything like that, either - but it made sense after I saw it).  Don, the manager, confirmed my suspicions, so we just dumped the 10 qts of engine oil, picked up some new oil and some 80/90 weight for the transmission, and everything was all good after that.

A few years later while at the Auto Hobby Shop when both Don and Jim were working there, we'd seen that again.  But the kid was one of those that already knew everything about everything, so we just kind of sat back and watched it all unfold, explained what had happened when he came over with his tail between his legs, helped the kid get it back to good, and had a good laugh.  I sure miss those days... and my pals.

Eric

[Image: mach1sig2.gif]
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#20
I also have good memories from the auto hobby shops in the Air Force. I rebuilt an Opel 1.9 Litre at Hahn A.B. Germany and my first 351C at Seymour Johnson A.B. North Carolina. Good time and it kept me out of trouble, well mostly. Chuck
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