260zturbo Posted December 23, 2006 Share Posted December 23, 2006 while cranking the car i see on megatune a pulse width. i think its 4.7. when i look at the plugs i cannot see any fuel so what gives? Quote Link to comment Share on other sites More sharing options...
z-ya Posted December 23, 2006 Share Posted December 23, 2006 You mean you are looking at the injector, right? Is the fuel pump on? Quote Link to comment Share on other sites More sharing options...
260zturbo Posted December 25, 2006 Author Share Posted December 25, 2006 sorry if i was unclear. i meant to say on megatune it says i have a injector pulse with that shouldnt my spark plugs have gas on them? my car is not turning over. i dont really see or smell gas on the spark plugs Quote Link to comment Share on other sites More sharing options...
z-ya Posted December 25, 2006 Share Posted December 25, 2006 Do you have fuel pressure? Quote Link to comment Share on other sites More sharing options...
jimbo5670 Posted December 26, 2006 Share Posted December 26, 2006 im having a similar problem, it is bewildering Quote Link to comment Share on other sites More sharing options...
260zturbo Posted December 26, 2006 Author Share Posted December 26, 2006 yea, sorry i forgot to state that. i have a pallnet rail with a fuel guage. the guage reads 35lbs when the fp kicks on. the injectors are 440cc supra injectors. Quote Link to comment Share on other sites More sharing options...
z-ya Posted December 26, 2006 Share Posted December 26, 2006 Does MT show a steady RPM when cranking? Do you have fuel pressure when cranking? Quote Link to comment Share on other sites More sharing options...
260zturbo Posted December 26, 2006 Author Share Posted December 26, 2006 yea mt shows a steady rpm range while cranking. the fp also kicks on while cranking Quote Link to comment Share on other sites More sharing options...
z-ya Posted December 26, 2006 Share Posted December 26, 2006 Do you have +12v on one pin of the injector? Do you have resistors in series with the second injector pin and the MS? How do you have the injectors wired (3 in parallel on each injector driver)? Have you tested your MS on a stim? Quote Link to comment Share on other sites More sharing options...
Tony D Posted December 26, 2006 Share Posted December 26, 2006 Even more importantly on a car that cranks but does not fire....do you have spark as well? You are not tromping on the pedal while cranking (giving the 'flood clear' signal inadvertently)... Pulsewidth showing doesn't mean it's enough to fire the engine, especially if there is no spark on the plugs.... Do you see your fuel pressue fluctuate at all while cranking? Usually the bogger pulsewidth batch fire on simultaneous will draw down the fuel pressure enough to see it. If you don't see fluctuations, you may indeed not have injection events happening, but you have to also verify spark... Is the Injector LED on the MS Box flashing, indicating the MS is sending an initiation pulse to the injectors? If it's not, then there may be something internal to the MS. If it is, then it may be external between the box and the injectors. Just because you read it on the MT, doesn't mean it's actually physically connected and cycling the injectors. Quote Link to comment Share on other sites More sharing options...
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