ls_datsun Posted October 8, 2019 Report Share Posted October 8, 2019 I recently bought a 1975 dastun with a l20b that cranks but no start. Changed spark put ngk iriduims. has spark any suggestions Quote Link to comment
datzenmike Posted October 8, 2019 Report Share Posted October 8, 2019 Not fond of iridium plugs or synthetic oil. Both are too high tech for a simple 45 year old technology engine. Did you check AT the end of the plug wire? or at the coil? Where are you? your profile isn't filled out. Is it cold or freezing near you? Is the choke closed? Look at the glass on the front of the carburetor, is gas showing? Quote Link to comment
ls_datsun Posted October 8, 2019 Author Report Share Posted October 8, 2019 there is gas showing just a little im from california so not to cold and what do you mean by AT bearly learning sorry. Quote Link to comment
distributorguy Posted October 8, 2019 Report Share Posted October 8, 2019 The word "at". Spark at the spark plug versus spark at the coil. Irridium plugs are high resistance and shouldn't be used in a carbureted system. They are designed for use with coil-on-plug. You need low resistance plugs and wires, or your spark quality suffers greatly. Add fuel - see if it starts. Starting fluid. You need fuel and spark, so adding fuel will tell you if its a carb issue. 2 Quote Link to comment
banzai510(hainz) Posted October 8, 2019 Report Share Posted October 8, 2019 most likely points situation. cheack for spark at the coil wire. take wire out of center of distributor cap and place near chassis. crank over and see and feel for a spark. If yes then its good. if NO then ck the points for gap. wire loose fuse for ignition if no dash lights see if gas squirts in carb. yes or no. If no then no gas. then adjust the valves or see if lash pad fell off. This is a simple fix Quote Link to comment
ls_datsun Posted October 8, 2019 Author Report Share Posted October 8, 2019 the coil wire does have spark where would the fuse ignition be because my fuse box under the sterring the right side is melted probably excessive current. there is no dash lights only turn signal lights. gas does squirt Im probably going to try all this with the new spark plugs thanks. Quote Link to comment
banzai510(hainz) Posted October 8, 2019 Report Share Posted October 8, 2019 if coil wire has spark then that part is OK. did you do something else like move the spark plug wires around and got them wrong. This is a 1/2 hour fix if that if I was there. But we don't know your skill level Quote Link to comment
ls_datsun Posted October 8, 2019 Author Report Share Posted October 8, 2019 The only thing that was wrong was timing it would back fire bad im pretty new i got this truck to start learning because im goin to college for automotive Field Quote Link to comment
banzai510(hainz) Posted October 8, 2019 Report Share Posted October 8, 2019 ok if sanything else was changed like coil to a newer type . ballast resisitor remove ect will kill these off unless its designed for it. you said timming so what was the fix? was running fine then it died? what exactly. Quote Link to comment
ls_datsun Posted October 8, 2019 Author Report Share Posted October 8, 2019 Bought the truck not running so unsure cranks fun but doesnt start idk if any thing was changed Quote Link to comment
banzai510(hainz) Posted October 8, 2019 Report Share Posted October 8, 2019 well I sent you my vid and go thru it and hopefully it will help. fire order, timming of distributor and cam ect its all in there. until you check that your just waisting the starter and battery Quote Link to comment
ls_datsun Posted October 8, 2019 Author Report Share Posted October 8, 2019 Thanks i kind of thing it has to do with fuse box it melted and there is no wires connecting in the middle fuses have current but im missing the two middle one any images of fuse boxes by chance Quote Link to comment
banzai510(hainz) Posted October 8, 2019 Report Share Posted October 8, 2019 (edited) datsunmike is more a 620 expert you might hasve spart on STARYT but maybe not on Run on key switch. key is to measure voltage at the + side coil and at the ballast resistor to see if you have voltage with Key ON Edited October 8, 2019 by banzai510(hainz) Quote Link to comment
ls_datsun Posted October 8, 2019 Author Report Share Posted October 8, 2019 ok thank you i will try talking to him Quote Link to comment
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