datsundrifter Posted November 25, 2013 Share Posted November 25, 2013 Hey guys im new to hybridz and i need of soon answers. I have a 76 280z and recently got it started and it ides where it it needs to but it runs rich and sounds like it is not running on all cylinders. It studders a bit when i rev it and blows black smoke when reved and white as it idles as well. I cleaned all the injector type conections already and replaced the rubber on injectors. and replaced spark plugs and wires, new oil and filter as well. checked the comprestion too 145 to 150 on all cylinders. spark is good but spark plugs are black already after a couple of starts. car starts right away and stays running but just runs to rich. and cant figure it out. And what should the resistance be for the thermotime and fuel mix be. thanks really need to get this fixed. Quote Link to comment Share on other sites More sharing options...
Miles Posted November 25, 2013 Share Posted November 25, 2013 Covered many times. Do a search for "rich". Search'n https://www.youtube.com/watch?v=yxEODjxaIfM Quote Link to comment Share on other sites More sharing options...
Pharaohabq Posted November 26, 2013 Share Posted November 26, 2013 You should search and Download the FSM and fuel injection guide. all the info is in there. That being said, it sounds like a vacuum leak to me. Just unplug the CS injector after it's warmed up and see how it's running. Quote Link to comment Share on other sites More sharing options...
9rider Posted November 26, 2013 Share Posted November 26, 2013 What is RPM when idling after warm up? I installed a permanent fuel pressure gauge when I first got my 76 280z, That helped me a lot during the course of tune up and diagnose most problem. Quote Link to comment Share on other sites More sharing options...
datsundrifter Posted November 26, 2013 Author Share Posted November 26, 2013 yeah ive looked around and done alot of research but have not got anyware lol. ive tried taking the cold start off no change also AS and AR no change. and as far as idle it stays at 800rpm right from start all the way to warm no change in rpm at idle just sounds like its misfiring and theres plenty of black smoke when u rev it. i also took it around the block for the first time today and it starts boging and sputering at higher rpms. going to check the fuel presure tomorrow. but what should the cold start and fuel mix valve read when working corectly. thanks again cant wait to get it running right. Quote Link to comment Share on other sites More sharing options...
Pharaohabq Posted November 26, 2013 Share Posted November 26, 2013 You should search and Download the FSM and fuel injection guide. all the info is in there. That being said, it sounds like a vacuum leak to me. Just unplug the CS injector after it's warmed up and see how it's running. As I said, DL the FSM it's free on the net. Look at XenonS30.com, Again It sounds like a vacuum leak.. It's possible it could be your Temp sensor though, since if it's reading way off the ecu could be telling it to dump extra fuel. A temp sensor is cheap. But the FSM has the test procedures in it so start there! Quote Link to comment Share on other sites More sharing options...
datsundrifter Posted November 26, 2013 Author Share Posted November 26, 2013 i looked at the fsm but does not tell me what the resistance should be. also i dont think i have a vacuum leak plus wouldnt a vacuum leak make it run leaner. and where should i check for a leak if i have a vacuum gauge thanks. Quote Link to comment Share on other sites More sharing options...
Connor280ZX Posted November 27, 2013 Share Posted November 27, 2013 You could have a few froxen injectors. Your AFM may not be opening as well. Take the cover off of the AFM (Located between the filter housing, and throttle body) And make sure the mechanism is moving as you apply throttle. Quote Link to comment Share on other sites More sharing options...
datsundrifter Posted November 27, 2013 Author Share Posted November 27, 2013 ok ill try that then with the AFM, and did u mean frozen, and how would i go about checking that then. thanks. Quote Link to comment Share on other sites More sharing options...
datsundrifter Posted November 27, 2013 Author Share Posted November 27, 2013 hey there is two white bullet female connectors right at the end of the wire harness dont know what for. also i did the harness check for resistance and voltage everything worked but the first to tests witch r idle throttle switch showed nothing as well as full throttle switch and cold start system circuit. it says after u disconnected the starter solinoid connect volt meter to pin 21 and a ground and turn the key to start and hold it and it should read little to no voltage witch it did and after no more then 15 secs it should read battery volts and i held it for more than 30 secs and it never showed battery volts. ? what to do next also i have a extra ecu should i try that too. Thanks. Quote Link to comment Share on other sites More sharing options...
9rider Posted November 27, 2013 Share Posted November 27, 2013 Use this one to diagnose, it was doing good for me, hope for you as well. http://www.xenons130.com/files/280zfuelinjectionbook.pdf Quote Link to comment Share on other sites More sharing options...
9rider Posted November 27, 2013 Share Posted November 27, 2013 hey there is two white bullet female connectors right at the end of the wire harness dont know what for. also i did the harness check for resistance and voltage everything worked but the first to tests witch r idle throttle switch showed nothing as well as full throttle switch and cold start system circuit. it says after u disconnected the starter solinoid connect volt meter to pin 21 and a ground and turn the key to start and hold it and it should read little to no voltage witch it did and after no more then 15 secs it should read battery volts and i held it for more than 30 secs and it never showed battery volts. ? what to do next also i have a extra ecu should i try that too. Thanks. You don't need an extra ECU , however, if you have it on hand then it worth a try. I doubt the problem from the ECU. I did open up my ECU back then and basically test almost the entire circuit in there. There is nothing wrong and nothing in there. I suggest you test all pin from ECU and know which sensor bad or good and if the FI system is good. Test procedure is in the link I gave you up there. The value should be in within of the printed values. Good luck. Quote Link to comment Share on other sites More sharing options...
datsundrifter Posted November 27, 2013 Author Share Posted November 27, 2013 yeah thats the manual i used to do the tests. but also i just took the cap off the AFM and the metal wight like thing that is on the moving part was broken off. Quote Link to comment Share on other sites More sharing options...
9rider Posted November 28, 2013 Share Posted November 28, 2013 Put the AFM back and move the flap inside with key on. You should hear pump humming noise, that is one way, the other way is still test the pin from ECU. You sure didn't break it when trying to open the AFM up??? BTW, saw a guy in part for sale section have some AFM for sale, I am not sure it is for NA or turbo.. You can take a look. GL' Quote Link to comment Share on other sites More sharing options...
harlest Posted November 28, 2013 Share Posted November 28, 2013 Hi datsundrifter I had the same problem om my 78 280. It turned out to be the plug on the AFM was pulled out on one side. I think your on the right track Quote Link to comment Share on other sites More sharing options...
datsundrifter Posted December 3, 2013 Author Share Posted December 3, 2013 hey i would like to thank everyone for their help i think i have found out the main prob it was the AFM the weight balance thing that moves under the cover was broke off and causing it too not be able for the flap to move freely, now it sounds so much better and no black smoke and the plugs have cleaned all up. But cylinder num 1 plug was a little damp not sure why?. anyways thanks again. R.I.P. PAUL WALKER FAST AND FURIOUS FOREVER!!!!! Quote Link to comment Share on other sites More sharing options...
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