Mr.INSANE Posted December 27, 2007 Share Posted December 27, 2007 Thanks to that book i just got my 280 running Biggest smile across my face when that thing fired up Quote Link to comment Share on other sites More sharing options...
smoorenc Posted December 27, 2007 Share Posted December 27, 2007 It saved me too when we first got our Z. Congratulations!! Quote Link to comment Share on other sites More sharing options...
MJLamberson Posted December 27, 2007 Share Posted December 27, 2007 congradulations, I know that feeling of joy when she fires up... its wonderful... especialy when you get in that slump and feel it will never run again, as if it were doomed. I hate that. Quote Link to comment Share on other sites More sharing options...
Gollum Posted December 27, 2007 Share Posted December 27, 2007 'Bout bloody time. So what all was wrong? Quote Link to comment Share on other sites More sharing options...
Careless Posted December 29, 2007 Share Posted December 29, 2007 congrats! man, i had a fit trying to start mine, until one day I says to myself "it's that bloody fuel pump!". so I disassembled it and and gave it a good cleaning, purged it with some solvents, and BAAAM. 10:30 at night, my exhaust broke off its rusty bolts to the roar of all 6 cylinders at 6,000 RPM after a 20 year hiatus. Nothing quite like that first-time feeling. (and just for good measure) "That's what SHE said" *ahem*. congrats =) Quote Link to comment Share on other sites More sharing options...
Mr.INSANE Posted December 29, 2007 Author Share Posted December 29, 2007 'Bout bloody time. So what all was wrong? Ahh lets get started First off there where to many fuel related problems i swear, a few injectors where stuck and leaking but thats been fixed. and old fuel line in the back finally burst after 20 years (since then ive replaced all fuel line's) The starter I got for it awhile back was bad. After i got it running i ended up replacing the intake/exhaust manifold gasket becuase of vacuum leaks. I think i need a new TPS and AFM still too All in all i still have a lot of buttoning up todo. Alternator need's replacing etc etc etc Quote Link to comment Share on other sites More sharing options...
Gollum Posted January 1, 2008 Share Posted January 1, 2008 I'd hold off on the AFM replacement. Odds are it's fine, just needs to be cleaned up/rebuilt. Easier to do that yourself before trying to find a replacement, though I come across them EVERY time I'm at picknpull if ya need one. Quote Link to comment Share on other sites More sharing options...
Mr.INSANE Posted January 2, 2008 Author Share Posted January 2, 2008 I'd hold off on the AFM replacement. Odds are it's fine, just needs to be cleaned up/rebuilt. Easier to do that yourself before trying to find a replacement, though I come across them EVERY time I'm at picknpull if ya need one. Yeah, I'm still not entirely sure its the AFM i really think there's a vacuum leak I haven't caught yet. I don't have any starter fluid or WD40 to find it though. Oh yeah found out my cold start injector is gone too Quote Link to comment Share on other sites More sharing options...
Careless Posted January 2, 2008 Share Posted January 2, 2008 Yeah, I'm still not entirely sure its the AFM i really think there's a vacuum leak I haven't caught yet. I don't have any starter fluid or WD40 to find it though. Oh yeah found out my cold start injector is gone too You can use propane Quote Link to comment Share on other sites More sharing options...
Mr.INSANE Posted January 2, 2008 Author Share Posted January 2, 2008 You can use propane Don't have any of that either Anyways I at least think its a vacuum leak, It wont rev at all unless I floor it or slowly do it Quote Link to comment Share on other sites More sharing options...
76280z Posted January 8, 2008 Share Posted January 8, 2008 ^^It's all about the smoke machine, for finding vacuum leaks. Quote Link to comment Share on other sites More sharing options...
alexideways Posted January 8, 2008 Share Posted January 8, 2008 ^^It's all about the smoke machine, for finding vacuum leaks. You don't see that every day, a backyard mechanic with a smoke machine... Quote Link to comment Share on other sites More sharing options...
TrumpetRhapsody Posted January 8, 2008 Share Posted January 8, 2008 $30 at a Halloween store. Probably what I'm going to end up doing. Quote Link to comment Share on other sites More sharing options...
jasper Posted January 8, 2008 Share Posted January 8, 2008 Spray carb cleaner works very well for vacuum leaks. Quote Link to comment Share on other sites More sharing options...
Mr.INSANE Posted January 8, 2008 Author Share Posted January 8, 2008 I think I've found the leak. The not revving problem is still there, When i give it gas it sputters but when I let off the gas it idles higher. I can get it to rev if i floor it though Quote Link to comment Share on other sites More sharing options...
Daeron Posted January 8, 2008 Share Posted January 8, 2008 you should check your throttle position switch for proper functioning. MY favorite way of finding a vacuum leak is to use a mechanic's stethoscope (less than ten bucks at harbor freight) or a piece of tubing with one end in my ear, and listen around anywhere air flows or vacuum pressure is established, listening. I know it must sound strange, but i trust this method MUCH more than I trust haphazard spraying of combustibles.. not over a safety factor, simply far easier to reproduce results, and cheaper in the long run than wasting can after can of carb cleaner or starting fluid. The mechanic's stethoscope is a GREAT tool. Quote Link to comment Share on other sites More sharing options...
Mr.INSANE Posted January 8, 2008 Author Share Posted January 8, 2008 you should check your throttle position switch for proper functioning. MY favorite way of finding a vacuum leak is to use a mechanic's stethoscope (less than ten bucks at harbor freight) or a piece of tubing with one end in my ear, and listen around anywhere air flows or vacuum pressure is established, listening. I know it must sound strange, but i trust this method MUCH more than I trust haphazard spraying of combustibles.. not over a safety factor, simply far easier to reproduce results, and cheaper in the long run than wasting can after can of carb cleaner or starting fluid. The mechanic's stethoscope is a GREAT tool. Mine doesnt seem to want to come apart. Just buy a new one? Ill look into that method it seems cheap and I'm trying to keep costs down as it is Quote Link to comment Share on other sites More sharing options...
Daeron Posted January 9, 2008 Share Posted January 9, 2008 first test it for proper function; read the bible for details, but there are three terminals. at zero throttle, there should be continuity between A and B, at part throttle there should be no contact, and at WOT there should be contact between B and C. I cant recall which wires are A, B, and C, but thats the basic version of the test. If it functions appropriately, then its good. if it doesnt, get a flat screwdriver and pry the black plastic cover off. Its glued on. ALOT of hitachi FI components are assembled in this same way; it WILL just come off. If it doesn't work, what do you have to lose? Once you get the cover off, you discover how rudimentary this thing is; its so blatantly obvious i wont even describe it. More modern vehicles use a throttle position SENSOR (not switch) that is essentially a "volume knob" (potentiometer) indicating the position of the throttle.. but this is literally just two contacts. One indicates idle, no contact indicates "running" and the other contact indicates WOT-Full Enrichment. Quote Link to comment Share on other sites More sharing options...
Mr.INSANE Posted January 10, 2008 Author Share Posted January 10, 2008 first test it for proper function; read the bible for details, but there are three terminals. at zero throttle, there should be continuity between A and B, at part throttle there should be no contact, and at WOT there should be contact between B and C. I cant recall which wires are A, B, and C, but thats the basic version of the test. If it functions appropriately, then its good. if it doesnt, get a flat screwdriver and pry the black plastic cover off. Its glued on. ALOT of hitachi FI components are assembled in this same way; it WILL just come off. If it doesn't work, what do you have to lose? Once you get the cover off, you discover how rudimentary this thing is; its so blatantly obvious i wont even describe it. More modern vehicles use a throttle position SENSOR (not switch) that is essentially a "volume knob" (potentiometer) indicating the position of the throttle.. but this is literally just two contacts. One indicates idle, no contact indicates "running" and the other contact indicates WOT-Full Enrichment. If seen the Innards before, I was under the impression that they where a bit more complicated than that. As in the tell they Ecu about throttle changes before the Ecu knows to compensate for fuel and air and the such. Edit: Tested, it wasn't working right, Turns out theres another Unit besides the Hitachi The JECS one. It has rivets that most be drilled out to open it Quote Link to comment Share on other sites More sharing options...
Daeron Posted January 10, 2008 Share Posted January 10, 2008 Edit: Tested, it wasn't working right, Turns out theres another Unit besides the Hitachi The JECS one. It has rivets that most be drilled out to open it Bah, I forget sometimes that alot of the datsun FI stuff was JECS and not Hitachi sourced... its all so similar looking anyhow, and i do more work on my subaru than on my datsun, I just inserted the name "hitachi" without thinking. It still shouldn't be too difficult to pull apart, and if you have to zip tie the cover back on, or glue it with a light bead of silicon or something, hey.. you still might be able to make that part work until you can get another one cheaply and easily (read: junkyard, on a lucky day) I know how its worded in the book makes it seem like there is more to that, but seriously.. thats it, just three possible conditions. sounds like you got the (a?) problem traced, in any case. That book was written for technicians who had grown up in a world where computer controlled EFI did not exist.. they "jazzed it up" a bit in some places Quote Link to comment Share on other sites More sharing options...
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