Turbo280Z Posted March 9, 2006 Share Posted March 9, 2006 ok on my 78 280zt it was idling and then all of a sudden died. now it has no spark. im thinking its the ignitor. is there a way to test it or bypass it? will one from a 300zx work?. after this i think im going MSnSe. any help would be great Quote Link to comment Share on other sites More sharing options...
dapiper Posted March 9, 2006 Share Posted March 9, 2006 Check fuses and that 2.3K resistor inline with tach sig. Quote Link to comment Share on other sites More sharing options...
getZ Posted March 9, 2006 Share Posted March 9, 2006 this isn't a foolproof test, but I used a little 12v battery at base (computer input yellow/white wire) of the tranistor and measured resistance accross the neg coil end (blue wire) and ground. Everytime the 12 volts is applied the meter should read close to a short, at a minimum the resistance should change from like 2kohms to 2-3ohms. Quote Link to comment Share on other sites More sharing options...
Turbo280Z Posted March 10, 2006 Author Share Posted March 10, 2006 my tach isnt hooked up. ok ill try that thanks Quote Link to comment Share on other sites More sharing options...
GrayZee Posted March 10, 2006 Share Posted March 10, 2006 Yes a z31 ignitor will work, provided it is hooked up properly Quote Link to comment Share on other sites More sharing options...
Turbo280Z Posted March 11, 2006 Author Share Posted March 11, 2006 when i go home today ill put one from my 300 in. if the ignitor is bad will it make it run kinda messed up? like it runs smooth then kinda rough and then when u drive it it sputters and when it smooths out it runs fine but not for very long. any ideas? Quote Link to comment Share on other sites More sharing options...
getZ Posted March 12, 2006 Share Posted March 12, 2006 Bad ignitors don't usualy let the car run at all. The ignitor is simply a transistor designed to use as a switch. I would check timing and the temperature sensor. Is it spitting a dark cloud of smoke out the back when it is sputtering? Quote Link to comment Share on other sites More sharing options...
Turbo280Z Posted March 12, 2006 Author Share Posted March 12, 2006 i checked the sensors and changed my head temp sens. no it doesnt smoke at all. i dotn have any vacuum things hooked up. jus my AFM. maybe its cuz they dont have all the crap on it. it runs good when it wants to. i think the AFM might be going bad tho cuz when i mess with the flap it idles a lil better and revs cleaner. Quote Link to comment Share on other sites More sharing options...
Turbo280Z Posted March 13, 2006 Author Share Posted March 13, 2006 on the 300zx ignitor theres 3 wires that go into it and none that come out. how would i hook it up to work on the 280? Quote Link to comment Share on other sites More sharing options...
getZ Posted March 14, 2006 Share Posted March 14, 2006 A transistor (ignitor) typicaly have three wires. A base, emitter and collector. The 280z has two wire connection (base and collector) but actualy grounds the emitter through the clamp body. So it is possible. Quote Link to comment Share on other sites More sharing options...
getZ Posted March 14, 2006 Share Posted March 14, 2006 some other things to check: throttle position switch functionality measure AFM with meter, check the reisistance change across the position clamp off the throttle bypass when it is warmed up Quote Link to comment Share on other sites More sharing options...
Turbo280Z Posted March 16, 2006 Author Share Posted March 16, 2006 i changed the tps so i know it works. whats the throttle bypass? if the 2 sensors on the thermostat housing arnt hooked up with that matter? it ran fine the way it is in my donor car Quote Link to comment Share on other sites More sharing options...
getZ Posted March 16, 2006 Share Posted March 16, 2006 I don't know if you ran it or not, but the bypass routes air around the throttle valve during cold startups. As the car warms up the valve closes. A lot of guys opt to not even run the bypass valve. The default setting of the valve is open so it allows air around the throttle valve all the time. In the bypass housing is a bimetal wire that uses both electricity and warm engine water to close. If you're not going to hook it up I would plug off the end coming from the intake, but it runs lousy while it is cold. A quick test is to simply crimp off the air line and check how it idles with the line crimped on and off. By the way, that is a tip directly from the manufacturers manual to test the bypass valve. Quote Link to comment Share on other sites More sharing options...
getZ Posted March 16, 2006 Share Posted March 16, 2006 sorry, I meant pinch off, not crimp off. Vise grips do a nice job. Quote Link to comment Share on other sites More sharing options...
Turbo280Z Posted March 16, 2006 Author Share Posted March 16, 2006 i dont have any vacuum lines hooked up. only for my brakes, FPR, boodt guage and a pcv vavle on top of the manifold and the one underneathe it that comes from the block Quote Link to comment Share on other sites More sharing options...
VinhZXT Posted March 24, 2006 Share Posted March 24, 2006 have you try to swap out the CAS after it dies? I had a problem with one of my distributor. It allowed the car to run for 1/2 hour and then all the sudden it shut off. After it cooled down it would work again. GL Quote Link to comment Share on other sites More sharing options...
Turbo280Z Posted March 28, 2006 Author Share Posted March 28, 2006 it might be the CAS cuz it does that sometimes. i have one from a 300zx it looks the same. would i be able to put that in and see if it works? and i tried to take the old one out and its ike stuck in the dizzy. Quote Link to comment Share on other sites More sharing options...
VinhZXT Posted March 28, 2006 Share Posted March 28, 2006 I believed they are different. I actually have the 300ZX dizzy in my garage lol. After my dizzy went bad I figured I need some for spare and I went to the junk yard and took one home and tried to swap over and it was not the same .. I think I've read someone said they are the same but from my experience no they are not the same. GL I assume you won't be needing the ignitor any more eh? lol Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.