Mechanics

CHEVY 5.3L WONT START AGAIN! NEW BATTERY, NEW ALTERNATOR, STARTER CHECKED OUT GOOD, ALL FUSES AND RELAYS ARE GOOD. LAST TIME THIS HAPPENED I TOWED TRUCK TO DEALER AND THEY PUT IT ON COMPUTER, WAS TOLD EVERYTHING WORKED FINE. WHATEVER THE

2002 Chevrolet Silverado • 100,000 miles

2002 chevrolet silverado
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Logicestorms
October 21, 2011.



If its cranking over and will not start do below

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

If both fuel and spark is present-check the valve and ignition timing, this will lead you to problems

with compression and valves opening and closing at the wrong time/broken or jumped timing

belt/chain.

Rasmataz
Oct 26, 2011.