Mechanics

NAV RANDOMLY WON'T START

2004 Lincoln Navigator • V8 2WD Automatic • 122,222 miles

2004 Navigator randomly won't start just crank crank. Let set overnite start right up. Will start next 20 times. No rime or reason. Replaced fuel pump didnt help. Ether shot in breather it will start
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Rford2011
July 28, 2011.




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

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

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

Tiny
Rasmataz
Oct 14, 2011.


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