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

It takes 3-things for an engine to combust-compression, fuel and spark-

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 so, 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.

Answered by rasmataz
68 questions asked

I get fuel and i get spark to the spark plugs! Can u pls tell me what the trouble codes are - thanks! codes are 12,32,21,21,41 -
( 21 twice ? )

Response from stevemichigan
1 question asked

i smelt fuel so i thought i was getting fuel - the problem was - the fuel line was leaking under the pass seat floor ( fuel line fell off ) - so no fuel made it to the motor,,thanks 4 your time! car runs fine now!

Response from stevemichigan
1 question asked