Blitz21 Posted May 6, 2010 Share Posted May 6, 2010 '73 240 with stroker l28 running efi Whenever I start the car and as it warms up, it sprays out black oil-like stuff onto the ground. Think of if you shot some black spray paint parallel to the ground, thats what it looks like. I'll have pics up later. I have the stock hose from the valve cover to the intake, all the smog stuff is removed. I don't know what the substance is. Of the friends I asked, they said water/condensation to fuel. It doesn't evaporate and it looks to thick and black to be water. Also, if some of you happend to see my post in the non tech section, yull understand the importance of getting this fixed ASAP. Thank you much folks. Quote Link to comment Share on other sites More sharing options...
datsun723 Posted May 7, 2010 Share Posted May 7, 2010 Hahahaha, Matt. This thread makes me laugh. I have yet to see this is person yet so I'm not help as of now. I'll take a look at it on Saturday if you're going to cars and coffee! Quote Link to comment Share on other sites More sharing options...
T-Bone028 Posted May 7, 2010 Share Posted May 7, 2010 I would agree, water/condensation being mixed with exhaust gasses...my guess is you dont have a catalytic converter (I dont). Mine does the same thing after its been sitting for a while and I start her up. Here's a test. Start your car, get it fully warmed up, and drive it somewhere like a parking lot or something. Give it a couple healthy revs and see if spits out any tail pipe soot. You could probably even hold a piece of paper behind the tail pipe if that helps you see it any better. If all you get is exhaust gasses after its fully warmed up, and dont have any noticeable exhaust spray on the piece of paper, then you can pretty much assume its just condensation in your exhaust getting sprayed out during start up. After its warmed up, it should go away. If not, then time to investigate further. Quote Link to comment Share on other sites More sharing options...
Blitz21 Posted May 7, 2010 Author Share Posted May 7, 2010 Great minds T-Bone, I already tried that (against a wall, not with paper), and it is just gases, no solid-ish stuff. And yes I don't have a cat. So, in essence if I installed a cat it -should- dissapear? Or at least not paint the driveway black? Quote Link to comment Share on other sites More sharing options...
DrSideways Posted May 7, 2010 Share Posted May 7, 2010 Great minds T-Bone, I already tried that (against a wall, not with paper), and it is just gases, no solid-ish stuff. And yes I don't have a cat. So, in essence if I installed a cat it -should- dissapear? Or at least not paint the driveway black? Sounds like it is running pretty rich. Are you using the choke for cold start? If so try and start without that. Also don't rev the engine while sitting there. Crank up and move along. Does your tail pipe extension point straight out or down. Don't point it down. Hope that helps. Alan Quote Link to comment Share on other sites More sharing options...
Blitz21 Posted May 7, 2010 Author Share Posted May 7, 2010 ...I didn't know there was a choke for EFI. And yes, I start it, let it sit for about a minute or 2 and go, and the exhaust is straight. Quote Link to comment Share on other sites More sharing options...
DrSideways Posted May 7, 2010 Share Posted May 7, 2010 (edited) ...I didn't know there was a choke for EFI. And yes, I start it, let it sit for about a minute or 2 and go, and the exhaust is straight. Whoops, didn't the FI, just the '73 in your sig. It still sounds overly rich. FI engines do have cold start devices. You might look at the function of those items and check general state of tune. Don't sit. Just go. It can warm up away from your "spot". Alan Edited May 7, 2010 by DrSideways Quote Link to comment Share on other sites More sharing options...
Blitz21 Posted May 7, 2010 Author Share Posted May 7, 2010 I'll take a look into it. The mechanic I got the motor from said he was looking into a old style fuel controller. He described it as a small box with a few dials, for example dial 1 would be 2k rpm to adjust rich-lean. He said that would help with the richeness, but I'll see what I can do without that. Quote Link to comment Share on other sites More sharing options...
19762802+2 Posted May 7, 2010 Share Posted May 7, 2010 (edited) Try unplugging your cold start injector and see if that makes a difference. If that is the problem your cold start sensor could be bad. Edited May 7, 2010 by 19752802+2 Quote Link to comment Share on other sites More sharing options...
Blitz21 Posted May 7, 2010 Author Share Posted May 7, 2010 I'm guessing that injector would be near the front of the motor? Quote Link to comment Share on other sites More sharing options...
datsun723 Posted May 7, 2010 Share Posted May 7, 2010 I'm guessing that injector would be near the front of the motor? Its a little plug closer to the distributor I believe. I'll show you later today when we meet up for food/movies. Quote Link to comment Share on other sites More sharing options...
Blitz21 Posted May 7, 2010 Author Share Posted May 7, 2010 Sweet, then after I pull that it should be somewhat easy to see if the cold start sensor is good or not. Quote Link to comment Share on other sites More sharing options...
19762802+2 Posted May 7, 2010 Share Posted May 7, 2010 The cold start injector is right next to the TB on top you should see it, it has a line of fuel coming from the fuel rail. Good luck with the diagnose. Quote Link to comment Share on other sites More sharing options...
Blitz21 Posted May 7, 2010 Author Share Posted May 7, 2010 Thanks, I'll keep it updated when I do it. Quote Link to comment Share on other sites More sharing options...
rossman Posted May 7, 2010 Share Posted May 7, 2010 My old '76 280z did the same thing. I also removed all the cold start and emissions stuff (what there was of it). The stuff out the exhuast appeared to be a mixture of water and soot from the exhaust pipe. My engine ran rich causing soot to build up in the pipe. I suspect yours is doing the same thing. If it's really bad it could be a blown head gasket causing coolant to enter the combusion chamber, vaproize then condense in your exhaust. In that case your exhaust will smell like antifreeze. Quote Link to comment Share on other sites More sharing options...
Blitz21 Posted May 7, 2010 Author Share Posted May 7, 2010 I don't smell coolant, but what you described sounds almost exactly like what my car is doing. I don't know if the cold start is on or not. It doesn't look to bad , but considering I havn't had this motor for a month yet I'm realllyyy hoping its not a head gasket. Quote Link to comment Share on other sites More sharing options...
datsun723 Posted May 8, 2010 Share Posted May 8, 2010 One of the guys I hung out with tonight said it could be your rings. But your engine was technically just "rebuilt" so... Quote Link to comment Share on other sites More sharing options...
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