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Old 09-28-2003, 07:03 PM
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Blowing white smoke

I just got a 79 camaro from a friend as a gift sorta. Runs great after I rebuilt the carb. It had sit for 6 months or so in a field covered. I drove out and changed the oil at the first place I came to. Made it run a lot smoother and it doesn't shake as much. Before I changed the oil it would smoke at idle and when accelerating.

After I changed the oil the idle smoke went away and it just started doing it when accelerating. I've read that it is most likely the piston rings that are letting oil slip by into the compression chamber. I've checked and adjusting both the idle and fast idle on my q-jet and that fixed the problem of it running to rich and also gave it more of the performance I was expecting.

I also changed air filter, plugs, wires, fuel and dumped some fuel cleaner in it to clear out the lines and the pump. Steam cleaned the engine bay and tightened up the loose headers.

I am however still getting white smoke from the exhaust. If I hold my hand behind the pipe it doesn't get wet with oil so I know its not blowing a lot by but still some.

What I'm curious about is if I just keep up on the oil level and check it daily is it still safe to drive the vehicle like this before I rebuild it? It will take a bit of time to get the $$ up to rebuild the engine and having two cars will make my life and my wife's life a lot easier with our son. I'm only planning on driving back and forth to work which is about 2 miles away daily. Nothing long and definetly not any drag racing or street racing until its redone. So anyone have any opinions if I will do more damage to it or I just keep it full and deal with the smoke?

Thanks

Eric

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Old 09-28-2003, 07:11 PM
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White smoke is usually coolant from a bad head gasket or cracked or warped intake or head, also if it's an automatic check to see if it's sucking trans fluid up the vac modulator hose.
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Old 09-28-2003, 07:12 PM
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Hi Eric,, White smoke is usually a sign of tranny fluid getting sucked into the intake manifold by way of the modulator hose. If you have a T350 tranny, there is a hose at the rear of the intake that runs to the tranny. Pull the hose off at the tranny and see if any fluid drips out. If so, replace the modulator.

Oil smoke is usually kinda blue in color.

Over rich carb is black.

Water or antifreeze will also be whiteish color but will evaporate very fast and not linger like oil or tranny smoke.

If all else fails, it's probably time for rings or valve seals.
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Old 09-28-2003, 07:42 PM
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Hmm, never knew about the possibility of it being tranny fluid. Was thinking oil also because one of the exhaust pipes has a tiny crack in it and it leaks a tiny bit of oil there. Was thinking mostly like rings. Was told if the smoke disappeared after it was started that it wasn't valve seals.

The whole tranny / vacuum thing sounds like the culprit since I had to plug up 5 vacuum lines coming off the carb. Will try to take some pictures and see if someone can maybe help me out

Eric

Ok here are some pictures if anyone can help me out with what is supposed to go where. All the emissions stuff has been taken off so I'm not sure what exactly I can plug up. Just have em plugged with some nails and vaccum hose until I can get some caps tommorow when the store opens up.







#5 goes to the vacuum advance on the distributor and #2 goes to the choke thing. Sorry I'm not too familar with q-jets and am still trying to learn.

#3 is split going to the two pcv valves on the valve covers.

The vacuumn hose that comes out of the choke itself is plugged also. Along with #8 since you can't see those two.

The one option I do have also if this model would be too hard is that I have a q-jet off a 68 327 engine that doesn't have nearly this many vacuum ports. Would it be easier to just rebuild that one and put it on?

And I am guessing that #6 is what you are talkign about with taking it off to see if it is tranny fluid coming off from the modulator?


Eric

Last edited by esears; 09-28-2003 at 07:42 PM.
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Old 09-28-2003, 08:23 PM
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Swap #1 and #5 with each other.

#6 is the line going to the modulator as far as I can see.
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Old 09-28-2003, 08:23 PM
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Yes it will most likely be a rear port connected to a short hose then to a piece of tubing that goes down to the rear of the trans.
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Old 09-28-2003, 08:57 PM
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I switched 1 and 5 for the distrib and it seems to running a bit better when i give it some gas. As for the modulator checking I undid it and didn't see any evidence of fluid That probably would have been an easy fix. Looks like I'm going to have to do some piston rings or valve seals. I'm taking it for valve seals its take the heads off and the rocker arms, valve springs and its the little seals right on the valves right?

Thanks

Eric
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Old 09-28-2003, 10:12 PM
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Best way to ck the modulator is to get the car up off the ground some. Then you can see the hose going to the modulator. Its a small round "can" looking thing on the side of the tranny. Just pull the hose off of it and see if ANY fluid drips from the hose or the modulator.


As far as #6 hose "teeing off" into 2 hoses going to both valve covers, thats a new one on me. I've NEVER seen 2 pcv valves on one engine and that might be a give away on the previous owner trying to over come excessive blowby from the rings by using 2 pcv valves. Doesn't sound too kosher to me.
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Old 09-28-2003, 10:21 PM
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Thats one thing that I was thinking but since the vehicle was free and in pretty decent shape I really can't be too choosy. I'm just mostly interested to know if it is safe to drive while I troubleshoot this thing.

I'm pretty sure I can change the modulator easy enough since I do probably one a week at work (on a humvee) and those are mostly just o-rings that go bad and they leak. But its easy enough to change out. Now if I could just order my parts through the army

Eric
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Old 09-28-2003, 10:23 PM
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Well, if the cops don't stop you for excessive smoke, then go for it I guess. Plus it'll do good things to help control the skeeters flyin around out there.
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Old 09-29-2003, 08:50 AM
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ditto with jmark, 1 pcv.

Last edited by Wrencher; 09-29-2003 at 11:25 AM.
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Old 09-29-2003, 10:06 AM
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if the Modulator valve don`t check out, and your sure it`s coming past the rings, since the car sat it`s possible the rings are stuck. Go to your nearest car quest and get a can of Sea Foam, pour it in and let the car idle for about 15 minutes, then change the oil, you`ll see all kinds of crap come out with the oil. after installing fresh oil and filter, add some Marvel Mystery Oil, run it and see how it does.
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Old 09-29-2003, 10:57 AM
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Quote:
Originally posted by Wrencher
Your #5 vac. adv. hose should go to #4 fitting, #1 port is a timed port, it only gets vac. when the throttle is opened, # 4 will have vac. at idle.
So you're saying you want the vacuum advance hooked to manifold not port vacuum?
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Old 09-29-2003, 11:07 AM
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The vac. port in the carb. body will only see vac. when the throttle is opened, the port in the base supplies vac. all the time. You could say manifold vac., anything above the throttle plate is timed, anything under is idle vac. Does that make sense?
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Old 09-29-2003, 11:11 AM
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Yes that makes total sense, but the fact that every vacuum diagram you'll ever see for that car has the distributor hooked to port vacuum doesn't.
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