mellonman Posted July 14, 2011 Share Posted July 14, 2011 (edited) been having this for a while now was thinking valve stem seals but just wanted to check as its black smoke not the blue as normal the car was used everyday for years but now have a work van and the car just sits there all week now. what happens is on the first start up it will have some black smoke and then when i pull off up the road all i see is a load of black smoke behind me if i give it some or if i drive around for a while and then give it some stick, but after that first hard throttle it no longer smokes leave it for 5 hours no smoke leave it for a day very little smoke. i was thinking this could be a rich state causing this as black smoke is what that normally means, but what is throwing me off is that surely it would not get worse over the days sitting it surely would do it every cold start up if rich is there anything else it could be rich valve stem seals Edited July 14, 2011 by mellonman (see edit history) Quote Link to comment Share on other sites More sharing options...
Soopra Posted July 14, 2011 Share Posted July 14, 2011 Does sound like oil is getting into the pistons when the car is parked up... Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted July 14, 2011 Share Posted July 14, 2011 Black smoke is generally fuel smoke. Air fitler clean? Spark plugs in good condition? Quote Link to comment Share on other sites More sharing options...
Dnk Posted July 14, 2011 Share Posted July 14, 2011 Faulty injector perhaps Quote Link to comment Share on other sites More sharing options...
marc_p Posted July 14, 2011 Share Posted July 14, 2011 Does sound like oil is getting into the pistons when the car is parked up... Oil is blue smoke, black is fuel (and white is water) Does it struggle to start when you have a lot of black smoke on start up? Quote Link to comment Share on other sites More sharing options...
bigbloodyturbo Posted July 14, 2011 Share Posted July 14, 2011 If it was blue smoke i'd have said valve stem seals as if they're on their way out oil will leak down onto the back of the valve if its left sitting for a few hours/a day and cause what your describing on start up and after the first few revs. Quote Link to comment Share on other sites More sharing options...
mellonman Posted July 14, 2011 Author Share Posted July 14, 2011 its starts up fine i must point out i do have 650cc injectors and a aem fic it must be over fueling then as its black smoke. my afr's look to be normal though? plugs was changed about 2000 miles ago air filter looks clean maybe a sticky injector but they have only done about 10k if that. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 14, 2011 Share Posted July 14, 2011 Too much fuel. Quote Link to comment Share on other sites More sharing options...
Josh Posted July 14, 2011 Share Posted July 14, 2011 (edited) Too much fuel. Mine gives out a bit of black smoke if you rev it when the engine is warm. It also gives a bit of blue smoke on start up so I think the seals may need doing. A lot of people have commented saying "mm, the smell of unburnt petrol" so maybe I have the same problem.. Edited July 15, 2011 by Josh (see edit history) Quote Link to comment Share on other sites More sharing options...
mellonman Posted July 15, 2011 Author Share Posted July 15, 2011 Mine gives out a bit of black smoke if you rev it when the engine is warm. It also gives a bit of blue smoke of start up so I think the seals may need doing. A lot of people have commented saying "mm, the smell of unburnt petrol" so maybe I have the same problem.. have you checked your o2 sensor josh? do you get bad mpg these are things to check blue smoke would look like stem seals matey Quote Link to comment Share on other sites More sharing options...
Josh Posted July 15, 2011 Share Posted July 15, 2011 have you checked your o2 sensor josh? do you get bad mpg these are things to check blue smoke would look like stem seals matey Cue Scotty and the "46mpg" crap I'm going to check the o2 sensor at the weekend and see what's what. Fuel consumption seems fine, but next time I fill up I'll set the trip computer to 0 and record how many miles I get and what kind of driving I do. Quote Link to comment Share on other sites More sharing options...
mellonman Posted July 15, 2011 Author Share Posted July 15, 2011 you can get that sort of mpg i did try it once but far to slow for me 60mph on the motor way Quote Link to comment Share on other sites More sharing options...
mellonman Posted July 15, 2011 Author Share Posted July 15, 2011 Too much fuel. if it was too much fuel wouldnt it do it all the time? it does only seem to do it more when fast idle is still active( where you have to be stationary for a while once warm and wait for revs to drop) with my fast idle im getting afrs around 12-13 for the fist couple of minutes is that wrong? Quote Link to comment Share on other sites More sharing options...
Guest ugp Posted July 15, 2011 Share Posted July 15, 2011 Your looking around 13.2 for a cold start, 14.7 is optimum when its hot. 12-13's wouldn't give black smoke though. Are you sure its black and not blue? It does sound to me like valve stem seals, as what your saying is correct in that, if it was fuel, it would do it every cold start (if left for a few hours). Quote Link to comment Share on other sites More sharing options...
mellonman Posted July 15, 2011 Author Share Posted July 15, 2011 Your looking around 13.2 for a cold start, 14.7 is optimum when its hot. 12-13's wouldn't give black smoke though. Are you sure its black and not blue? It does sound to me like valve stem seals, as what your saying is correct in that, if it was fuel, it would do it every cold start (if left for a few hours). im sure its black, i got the misses to start the car and rev it so i could be sure thats the part thats getting me why dont it do it every cold start. strange well as it looks like a fuel thing and i have bigger injectors and a not so good piggy back i will have to live with it. thing is the o2 would be trying to keep the afr stoik and shows that on the guage so maybe not fuel what else could do it i might try and do a vid in a couple of days when it should be bad Quote Link to comment Share on other sites More sharing options...
Guest ugp Posted July 15, 2011 Share Posted July 15, 2011 You could check the cold start table in your piggy back, who mapped it? Quote Link to comment Share on other sites More sharing options...
mellonman Posted July 15, 2011 Author Share Posted July 15, 2011 i wish it had a cold start table lol its a aem fic 8 i have to dump fuel in the thing at 0-400 rpm it to start once hot and let cool for a hour or so might that be the problem? i would of thought it would of burnt off the excess fuel almost straight away? Quote Link to comment Share on other sites More sharing options...
Guest ugp Posted July 15, 2011 Share Posted July 15, 2011 So you mapped it? lol. Send me your map over and i'll take a look for you. I've done a few FIC6's, don't see why you would need the 8 in a supra? :S PM'd you my email address. Quote Link to comment Share on other sites More sharing options...
mellonman Posted July 15, 2011 Author Share Posted July 15, 2011 i didnt map it fully have had 2 club respected people on it but i did have to map some close loop stuff to stop boncing afrs Quote Link to comment Share on other sites More sharing options...
Guest ugp Posted July 15, 2011 Share Posted July 15, 2011 i didnt map it fully have had 2 club respected people on it but i did have to map some close loop stuff to stop boncing afrs Can they not sort the over fuelling then? Quote Link to comment Share on other sites More sharing options...
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