2000 Blazer won't run

[Snoopybase]

Help my blazer just died and won't start. The fuel psi is around 65, I have fire at the plugs (blue spark), I changed the crankshaft sensor, distributor cap & rotor, and the plugs. Injectors are also working, after you turn it over for a while you can pull a plug and it is wet with gas. When you go to start it, it just turns over, it won't spit,sputter or anything. Everyonce in a while it will backfire but not very often.
Computer codes are;
PO174 System too Lean(Bank 2)
PO171 System too Lean(Bank 1)
PO446 Evaporative Emission Control System Vent Control Circuit Malfunction.

Can Anyone HelP??????????????
Please
Thanks

[Rmbodie]

Posible ignition control module , or spark control module . sounds like the timing is well off .Rob

[BlazerLT]

Have you done a tuneup lately?

Ever changed the fuel filter?

[Snoopybase]

Yes I have changed the fuel filter, I forgot to list it also. How do you check the timing on the 4.3 vortec csefi engine?

[BlazerLT]

I honestly don't think it is timing, a five year old engine just doesn't jump timing without something major causing it.

Is the check engine light on now?

Sounds like the MAF sensor is on the fritz.

[Snoopybase]

The check engine light did come on before it quit.
After doing some more test this is what I have found.
When you first turn the engine over checking the spark at the coil, it has a nice blue spark for several turns then little or no spark at all for a few turns then it starts to spark again. Plug a test light into the ingination module it blinks very fast like it is working. Checked the coil with a ohm meter it shows to be ok. Maybe the coil is going out?????
Or could this be the PCM?

[BlazerLT]

How is the battery charge?

Is the battery dead? Could be a dead alternater drinaing the battery.

[rlith]

Silly question, but can you see the sparking at the coil without pulling the wire?

[Jea3]

I have a 97 blazer with a similiar problem. If I let it sit a few days, it won't start or has a very hard time starting.

Try starting it, don't step on the gas. If it doesn't start after a few revolutions, stop, turn the key off, and try again. After a few attempts, it will start. But sometimes, when you stop cranking, and turn the ignition off, it gets a quick spark.

[Snoopybase]

IT'S ALIVE
Ok just because the ohm's checks out ok on a coil and it throws a nice big blue spark dosen't mean it has enough volts to crank these newer engines. I changed the coil it started the first try. Pluged the old one back in and nothing. Pluged the new one in and it has not missed a lick.
Thanks for the input guys.

[BlazerLT]

Sweet, glad to see you on the road again.