christopherszx Posted November 18, 2013 Share Posted November 18, 2013 So for a couple of months now my 1983 280zx has been having a cold start problem. Every time I start my car it has a very bad cold start issue. The car will crank and crank and crank till finally the car sputters into life, after that the car runs fine but it is really ruining the battery to start like this. I only start it every once in a while but it happens every time. My prediction is that the cold start valve is not working but any ideas would be great Quote Link to comment Share on other sites More sharing options...
NewZed Posted November 18, 2013 Share Posted November 18, 2013 Could be that the fuel rail is draining. Bad FPR or bad fuel pump check valve. Use a pressure gauge to see. Quote Link to comment Share on other sites More sharing options...
christopherszx Posted November 18, 2013 Author Share Posted November 18, 2013 There is no fuel dibrevation after it has started thats why I think has to do with starting mechanisms in the car Quote Link to comment Share on other sites More sharing options...
christopherszx Posted November 18, 2013 Author Share Posted November 18, 2013 Also in portland it doesnt get very cold and now that i have been reading about cold start valves it doesnt seem like it will turn on when it is only 40 degrees so now I have no idea what the problem is. Quote Link to comment Share on other sites More sharing options...
Connor280ZX Posted November 28, 2013 Share Posted November 28, 2013 (edited) Are you certain its not the CSV? If not that, it might be the thermotime sensor. Once the car is started, how long does it take for the engine to stabilize? Edited November 28, 2013 by Connor280ZX Quote Link to comment Share on other sites More sharing options...
christopherszx Posted December 1, 2013 Author Share Posted December 1, 2013 I have no idea at this point, I ws told the cold start valve only starts if it is way below freezing. I was told it could be a injector leak but??? I hate starting my car like this, it is ruining the starter Quote Link to comment Share on other sites More sharing options...
christopherszx Posted December 1, 2013 Author Share Posted December 1, 2013 It takes about 1 1/2 minutes to warm up with a little revving at about 50 degrees Quote Link to comment Share on other sites More sharing options...
NewZed Posted December 1, 2013 Share Posted December 1, 2013 There is no fuel dibrevation after it has started thats why I think has to do with starting mechanisms in the car You need to measure fuel pressure after you shut the engine down and before you start to know if the fuel rail is draining. If the rail is at zero when you hit the starter the engine will just keep cranking until the rial fills and re-pressurizes. My 76 280Z has not had a cold start valve for the last few years. I went out last week after it had sat for a few days in the garage and it fired right up after about five revolutions. When I had an FPR that leaked down it would take longer, although not as bad as you're describing. You might also have weak spark. Check the grounds on your ignitor (power transformer) and its mounting bracket. During starting spark is weaker since battery power is sucked up by the starter. If you have a weak transformer it might cause starting problems. I had an ignition module once that would only start the engine with starting fluid but ran okay once the engine started. Quote Link to comment Share on other sites More sharing options...
Logoleaf Posted June 13, 2016 Share Posted June 13, 2016 Hey christopherszx, Did you have your problem solved? Please share if you did. Im have the same issue like yours. Thanks! Quote Link to comment Share on other sites More sharing options...
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