ktmp Posted June 20, 2008 Share Posted June 20, 2008 I just picked up a 1980 280zx that has sat outside for the last few years. The owner said it ran until it was parked. I have cleaned the injectors and replaced the spark plugs. I also drained the fuel tank and put in fresh fuel. I can start the car but it's sometimes hard so I use ether and it fires up. It runs extremely rough under about 2000 rpms. The engine sounds smoothe in the higher rpm's but it's missing or something in the lower rpms. All of the wiring seems dry and brittle allong with everything else. I have replaced the fuel lines going to the injectors from the fuel rail also. I'm not sure if it's electrical or fuel related. Where should I start? At this point I guess it could be anything because I really don't know how the car ran before I got it. I have ordered new plug wires, cap, and rotor. Please help me, I'm needing some direction with my new project. THANKS Kyle Quote Link to comment Share on other sites More sharing options...
naviathan Posted June 20, 2008 Share Posted June 20, 2008 Check the plugs, they'll indicate whether you're running rich or lean and we can further diagnose from there. Quote Link to comment Share on other sites More sharing options...
ktmp Posted June 20, 2008 Author Share Posted June 20, 2008 The plugs I removed were pretty black but I have no idea how long he ran them. Quote Link to comment Share on other sites More sharing options...
naviathan Posted June 20, 2008 Share Posted June 20, 2008 Sounds rich to me. Could be leaky injectors or cold start valve, maybe a bad head temp sensor or bad connection. Quote Link to comment Share on other sites More sharing options...
ktmp Posted June 20, 2008 Author Share Posted June 20, 2008 I'm going to go get some contact cleaner and clean all the terminal connections. I need a manual for the EFI system, have any suggestions? Quote Link to comment Share on other sites More sharing options...
naviathan Posted June 20, 2008 Share Posted June 20, 2008 I'm going to go get some contact cleaner and clean all the terminal connections. I need a manual for the EFI system, have any suggestions? Yes read your other thread where I answered that question as well. Quote Link to comment Share on other sites More sharing options...
ktmp Posted June 21, 2008 Author Share Posted June 21, 2008 Got that on the other thread, thanks again. Some good info there. If you happen to know where a microfiche is for a Throttle Body, I have a question about some internal parts and I can't seem to find a working microfiche for the unit. I'll keep searching as well. I will keep an update going on this problem but I am thinking it's the contacts at either the MAFS, Distributor and possibly at the injectors. Quote Link to comment Share on other sites More sharing options...
ktmp Posted June 22, 2008 Author Share Posted June 22, 2008 I replaced all the engine bay vac. lines and cleaned all electrical connections. The car starts right up and runs pretty good. Still has low speed sputter but I am going to replace and check all the components and sensors. Quote Link to comment Share on other sites More sharing options...
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