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Thread: Strange smoke from tube

  1. 10-21-2017, 02:50 PM #1
    Simonjjb
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    Strange smoke from tube

    I'm hoping the experts here can help me out...

    I spent the day replacing the cold start fuel lines from the fuel filter to the two stacks. They were leaking fuel. All went reasonably well - I removed the stacks so that I could carefully replace the lines without breaking the plastic inlet tubing and I replaced and re-crimped the new lines. I also found that the plastic lever in the tunnel below the handbrake has rotted - so I replaced that as well. Finally I replaced the vacuum line that runs from the stacks to the distributor. It was also rotted. I also replaced the tube from the pre-heat flapper box that runs to the heat exchanger. Finally, the heater tube was split, so I have removed it and ordered a new one.

    Start up was not easy - after a tough time with many false starts the engine stuttered and backfired a few times. It finally started and at first was very rough - almost as if it was running on only a few cylinders. Eventually everything smoothed out and it idled fine with the cold start hand lever also working fine. Engine sounded fine.

    After I shut it off I then noticed a fair bit of smoke - didn't smell like your typical burning oil - and quite acrid - it smoked for a while and then stopped. At first I thought it was some form of plastic burning, but I didn't see anything.

    Then I saw that it was coming up from the metal pipe as shown in the left photo. Its the pipe that the black hose that goes up to the MFI pump connects to. It smoked for a while and then stopped.

    Any ideas on whats causing that smoke? Where does that rubber hose that connects underneath the car go to?
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    1968 911L Coupe - Golden Green
    1971 911S Coupe - Gemini Blue
    1973 911S Targa - Signal Yellow
    1974 914 2.3 - Sunflower Yellow
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  2. 10-21-2017, 04:11 PM #2
    beh911
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    old oil in the heat exchanger is my guess. it got hot enough to start burning off
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  3. 10-21-2017, 08:09 PM #3
    edmayo
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    The rubber hose connects to a pipe on the heat exchanger, near the the hot air outlet.
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  4. 10-22-2017, 08:58 AM #4
    Simonjjb
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    I started her up this morning again. Good news is that using the cold start lever it started right up - first time and idled nicely at about 2000 rpm. So much easy to start now that I replaced the plastic part that connects to the accelerator cable in the tunnel. After a few minutes the smoke started up again, but it went away after 5 mins - so I suspect it was oil/cleaning fluid in/on the exchanger. Took her down the road and she ran like a top !
    1968 911L Coupe - Golden Green
    1971 911S Coupe - Gemini Blue
    1973 911S Targa - Signal Yellow
    1974 914 2.3 - Sunflower Yellow
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