manchador Posted December 1, 2009 Share Posted December 1, 2009 Hello everybody. I'm new to this forum. I would like to see if i can get help diagnozing my car troubles. It is a 1982 280zx turbo. I parked it back in 2000 because the rear end was making a clunky noise. In 2007 i sold it to a friend who had that fixed but never drove it or even registered it and i bought it back from him in 2008. The car was garaged from 2000 to 2007 then when i got it back it stayed outside for about a year. whenever i started it, it would run very rough and if i tried to move it, it would stall and die. After a while i noticed that if i kept spraying starting fluid through the intake, it would run normal, so i figured that at least one injector was bad. I found some injecors from a 300zx turbo and they are on the car right now. The car will only start if i squirt gasoline into the intake and will die once it burns that up. I pulled the injectors from the intake manifold but left them connected to the plugs, then i squirted gas in the intake and started the car. From this, i saw that the injectors are supplying gas because they were all squirting. Once again the car died when the gas in the intake was burned off. I had also replaced the connectors with the GM style injector connectors and dont know if i got the wires backwards. I went off a post i found doing a search. Any help with this is very appreciated. Thanks Quote Link to comment Share on other sites More sharing options...
aliphian Posted December 1, 2009 Share Posted December 1, 2009 That doesn't make any sense... Quote Link to comment Share on other sites More sharing options...
Guest Rolling Parts Posted December 1, 2009 Share Posted December 1, 2009 Download the FSM or read the "EFI Bible". Both are 100,000x better than just guessing and throwing parts at the problem and hoping that it eventually goes away... Can I trust you've at least measured fuel pressure to the rail by inserting a gauge just downstream of the fuel filter? Quote Link to comment Share on other sites More sharing options...
S130Z Posted December 1, 2009 Share Posted December 1, 2009 Also.....Old gas is bad gas. Drain your tank and put some fresh gas in there. And +1 on fuel pressure. Also change your fuel filter. Quote Link to comment Share on other sites More sharing options...
manchador Posted December 1, 2009 Author Share Posted December 1, 2009 I have not checked the fuel pressure. You said to measure it before the filter right? Could low pressure cause this? Quote Link to comment Share on other sites More sharing options...
S130Z Posted December 1, 2009 Share Posted December 1, 2009 Measure between the filter and the fuel rail. Low pressure could cause the car not to run. Idle pressure should be around 34 psi. Quote Link to comment Share on other sites More sharing options...
Guest Rolling Parts Posted December 2, 2009 Share Posted December 2, 2009 I have not checked the fuel pressure...Could low pressure cause this? That's a basic check on the health of the fuel system, one of many. Actually a dozen things individually (or together) can do this. S130Z suggested just a few based on the sketchy details you gave on the history that relate to fuel delivery. A good way to solve it is to start with good gas in a good tank and work forward (pump, lines, filter, pressure/regulator, injectors, return line). It's tedious as heck BUT that's the way you track down where it is. Quote Link to comment Share on other sites More sharing options...
powershotnt Posted December 2, 2009 Share Posted December 2, 2009 I do not want to hijack this thread but you mentioned old gas. My car has the same gas from a year ago in it. does modern day gas go stale within a year? I had a full tank now I am down to 1/2 and it runs rough at lower rpm's. Quote Link to comment Share on other sites More sharing options...
S130Z Posted December 2, 2009 Share Posted December 2, 2009 Year old gas is something I would not run in my car(but thats just me). Gas goes stail, looses its octane and is bad for the performance of your car. I would drain and refill with new gas. And if you plan on leaving it sit for the winter or more than a month, put some fuel stabilizer in the tank and run it for a minute or two. Quote Link to comment Share on other sites More sharing options...
Guest Rolling Parts Posted December 2, 2009 Share Posted December 2, 2009 .. does modern day gas go stale within a year? It's worse than that. Many modern gasoline is cut with 10% alcohol. Any leak at all in the vent system and alcohol attracts water and water promotes rust. Stabilizers only help keep it from going stale, they don't address the water/rust problems in modern gas. Always best to add a stabilizer AND keep the tank topped off to keep out water vapor. If the car in this thread sat for 7+years then job #1 would be dropping the tank BEFORE trying to start it.... Quote Link to comment Share on other sites More sharing options...
manchador Posted December 5, 2009 Author Share Posted December 5, 2009 I replaced all the gas from the fuel tank, and put a new filter in. I also measured the pressure between the filter and fuel rail and it is 24 psi. Does this indicate a faulty pump? Quote Link to comment Share on other sites More sharing options...
S130Z Posted December 5, 2009 Share Posted December 5, 2009 It could either indicate a bad pump or the fuel pressure regulator. Start at the pump, and if it doesnt get better, try the FPR(its the round thing on the fuel rail with a vaccuum line attached to it). Quote Link to comment Share on other sites More sharing options...
GLENN280ZX Posted December 6, 2009 Share Posted December 6, 2009 There is also a 10 micron screen in the pump it self. It is located on the inlet side of the pump. Quote Link to comment Share on other sites More sharing options...
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