Mechanics

CRANKS/NO START

1992 Lexus LS 400 • V8 2WD Automatic • 305,000 miles

Enter your question.'92 lexus ls400. In the morning
cranks continously but won't start. Can pull one spark plug out crank it and it starts fine. Replace plug
and can start and drive all day no problems. Next morning the same situation occurs. Anyone have a clue whats causing this?
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Ronnydplyr
June 10, 2011.



http://www.2carpros.com/articles/car-cranks-but-wont-start

Next time it refuses to start don't wait for it to make up its mind-do below immediately to determine if its fuel or spark problem

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if okay-check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,coil's resistances,cap and rotor,distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing

Rasmataz
Jun 17, 2011.