yoshi_w Posted February 7, 2011 Share #1 Posted February 7, 2011 Car: 1973 240z, l28, 280zx dizzy, 1973 flattop carbs.Hi, so I thought I was getting back on track with getting the car all fixed up, I changed the air filter and just changed the in-bay fuel filter. After replacing the fuel filter, I started up the car and it was idling a little better, but then I began to notice smoke coming from in between the carbs and engine, around where the exhaust manifold is. I couldn't pinpoint the location, what could be the cause?Sidenotes: it takes a while for the car to start up, a very long time, even with new fuel filter, choke doesn't work, if this could be connected to problem. Link to comment https://www.classiczcars.com/topic/38497-smoke-in-engine-bay-help/ Share on other sites More sharing options...
ajmcforester Posted February 7, 2011 Share #2 Posted February 7, 2011 Smoke problem sounds like a exhaust leak Link to comment https://www.classiczcars.com/topic/38497-smoke-in-engine-bay-help/#findComment-344914 Share on other sites More sharing options...
yoshi_w Posted February 7, 2011 Author Share #3 Posted February 7, 2011 I didn't realize you could physically see the smoke from the exhaust, makes sense though if you're right, thanks! Link to comment https://www.classiczcars.com/topic/38497-smoke-in-engine-bay-help/#findComment-344917 Share on other sites More sharing options...
d240zx2 Posted February 7, 2011 Share #4 Posted February 7, 2011 Could also be the burning off of spilt oil...?? Link to comment https://www.classiczcars.com/topic/38497-smoke-in-engine-bay-help/#findComment-344920 Share on other sites More sharing options...
yoshi_w Posted February 7, 2011 Author Share #5 Posted February 7, 2011 i dont think it would as I haven't changed the oil recently, unless its leaking from the cork rocker gasket? Link to comment https://www.classiczcars.com/topic/38497-smoke-in-engine-bay-help/#findComment-344923 Share on other sites More sharing options...
ajmcforester Posted February 7, 2011 Share #6 Posted February 7, 2011 How long has it smoked while running? Link to comment https://www.classiczcars.com/topic/38497-smoke-in-engine-bay-help/#findComment-344924 Share on other sites More sharing options...
ajmcforester Posted February 7, 2011 Share #7 Posted February 7, 2011 How clean is this engine, is it grimey? Link to comment https://www.classiczcars.com/topic/38497-smoke-in-engine-bay-help/#findComment-344925 Share on other sites More sharing options...
yoshi_w Posted February 7, 2011 Author Share #8 Posted February 7, 2011 I'm not gonna lie, it is pretty grimy, haven't gotten to cleaning it yet, I'm just trying to get it running reliably first. and from what I've noticed it has only smoked once or twice, but the smoke was thin enough that I'm sure I wouldn't have noticed it with the hood closed Link to comment https://www.classiczcars.com/topic/38497-smoke-in-engine-bay-help/#findComment-344928 Share on other sites More sharing options...
gryt57 Posted February 7, 2011 Share #9 Posted February 7, 2011 Yoshi,Does it smell like burning oil? Or is a electrical type burning smell? If it is splilled oil it should burn off eventually. Unless you do have a oil leak. Make sure its not electrical. I had one of my fuse links smoking one time, because I think the inspection lid had come in to contact with the battery post. Link to comment https://www.classiczcars.com/topic/38497-smoke-in-engine-bay-help/#findComment-344930 Share on other sites More sharing options...
ajmcforester Posted February 7, 2011 Share #10 Posted February 7, 2011 If it goes away after an hour of running you are more than likely burning something oily. They can leak at the head but exhaust leaks seem to be more common between the exhaust manifold and the downpipes so next time she's running before the engine gets to hot put your hand down by the connection and see if you fell hot air moving, be careful you can get burned doing this.The hard starting you need to fix the choke it help a lot. Link to comment https://www.classiczcars.com/topic/38497-smoke-in-engine-bay-help/#findComment-344931 Share on other sites More sharing options...
FastWoman Posted February 7, 2011 Share #11 Posted February 7, 2011 I bet it's oil somewhere on your exhaust. When I reworked my intake and exhaust, having sprayed PBlaster and WD-40 here and there, having handled parts with greasy hands, the same thing happened. When I first fired up the engine, it looked like I had built a small fire under the hood. The smoke cleared off after about 15 min. Link to comment https://www.classiczcars.com/topic/38497-smoke-in-engine-bay-help/#findComment-344938 Share on other sites More sharing options...
yoshi_w Posted February 7, 2011 Author Share #12 Posted February 7, 2011 I'm just a little worried about keeping the car running with it smoking, so I shouldn't be too worried if theres no wires there? Link to comment https://www.classiczcars.com/topic/38497-smoke-in-engine-bay-help/#findComment-344939 Share on other sites More sharing options...
zKars
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