...still no luck!
... so I have officially gone through every wire from connector to connector ,even bought a new digital multimeter & leads, followed all the guidelines for troubleshooting components - sensors, switches ,voltage regulator/rectifier, ignition/charging system, fuel pump/regulator/screens/injector, fuel pump pressure at tank and at fuel rail -
Installed a fresh new battery with slightly higher cranking amps
. Thoroughly cleaned throttle body, check throttle body butterfly opening/TPS setting
. New air filter, several new plugs, New TPS and coolant sensor( both were only gremlins that I could find...oh yeah, new coil too - the plug cap cracked after several times removing it and you can't buy just the cap to fit that cavernous hole! Valve leak down test
, compression -
, checked cam for bad spring/ wear on decomp mechanism -
, fresh fuel, fresh oil and filter change, new air filter, checked grounds -
,checked for sheared flywheel key/cam timing -
. It starts right up but within' seconds shuts off. I have managed to feather throttle a few times to keep it running but it misses and most times backfires. I found someone with the same year /model and swapped the ECU ,no change. Swapped fuel rail and injector- no change. I was at the end of my rope ..tried a new plug- no change, so I decided for the heck of it to check spark again (at night of course)... I may have found something or not ..the spark initially is fast bright and steady but after 4-5 seconds of cranking, the spark is still evident but frequency has slowed down noticeably. I stopped cranking let it sit for 15 seconds or so and the same thing, spark is quick and bright but after several seconds , the spark intervals are slowed down . Don't know if I am onto something but by all means by testing per service manual, everything in ignition and voltage regulator and battery are well within spec. ANY CLUES!?!?