Chris Jones Posted February 18, 2012 Report Share Posted February 18, 2012 Hi can someone help me please. running HEi-8 Dizzy taken dizzy out of engine with ignition turned on spinned dizzy injectors fire and have spark tried to start car no spark had laptop connected PC Link while cranking said system voltage got down to about 8volts checked coil postive while cranking said about 8volts put key in ignition place shorted starter out to make it go no spark saw that the dizzy was turning but no spark ran 12v postive to computer from another 12v battery and negative from battery to alloy inlet manifold where Linkplus earths are system voltage 12v tried cranking still no spark unplugged starter held key in start place and checked voltages everywhere all reading 12v tried jumper lead from battery neg to engine in case of bad earth still no spark. any advise? Quote Link to comment Share on other sites More sharing options...
Chris Jones Posted February 19, 2012 Author Report Share Posted February 19, 2012 abit more info engine is cranking at 125rpm if i remove spark plugs it cranks faster and we get spark if i remove the dizzy and turn slowly no spark turn fast have spark the engine is turning over fast enough to start PC Link isnt detecting any RPM while cranking says 0rpm while turning by hand ive seen it go to 200 -600rpm Quote Link to comment Share on other sites More sharing options...
Scott Posted February 19, 2012 Report Share Posted February 19, 2012 Hi Chris, How good are your batteries? To me it sounds like your ignition coil is not getting enough voltage and your engine is cranking too slowly. Most engines I have seen crank at around 200 to 300 rpm. A battery can still produce 12volts and still be down on output. I would recommend getting your battery load tested. Scott. Quote Link to comment Share on other sites More sharing options...
Chris Jones Posted February 20, 2012 Author Report Share Posted February 20, 2012 fault found, dizzy has a bypass which requires a 0-5v wire 0volts while cranking 5v once running i had this wired 5v all the time. this all so is used so the engine starts on base timing then once running the computer controls the timing. Quote Link to comment Share on other sites More sharing options...
Scott Posted February 20, 2012 Report Share Posted February 20, 2012 Good to hear you found the problem, thanks for sharing the info! Cheers, Scott. Quote Link to comment Share on other sites More sharing options...
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