Truck wont start!

[82oldskid]

I know this ain't about a 73-87 truck, but I was hoping somebody might be able to help.  I recently put a starter in an 01 Silverado with a 5.3.  Before this, the truck wouldn't crank at all.  Put the new starter in and now it cranks but won't fire.  This wasn't an issue before the starter died.  Now it just cranks like its not getting fuel or spark.  I haven't gotten into diagnosing anything yet, bit I know the fuel pump is cranking.  I'm kinda baffled and am looking for any ideas on this.  If anyone has any ideas on this, please chime in.  Thanks!

[Irish_Alley]

make sure you're getting spark and signal to the injectors

[bake74]

make sure you're getting spark and signal to the injectors

      Did you see if there was any codes that would pull ?

[82oldskid]

Irish_Alley:  Thats the game plan for tonight.  And I'm checking the fuel pressure, even though the pump is running.  The guy who brought this truck to me didn't even know what year the truck was, or what motor, so for all I know, this could have been a long time problem that he never noticed.

bake74:  Haven't yet, my buddy is bringing his code reader tonight for me.  I'm a little skeptical cause the battery was disconnected, but then again, it did save the radio settings when I hooked it back up, so who knows.

Unfortunetly, I'm at my day job right now, so I can't do anything til this evening, but in the mean time, keep the suggestions rolling!  Thanks for your answers so far!

 

[bake74]

      Well if it does not show any codes that is a bummer.  I am sure before you get home tonight more members will chime in.

[thirsty]

When you are digging into this remember the basics that every motor needs to run.
Air, Fuel, and Spark at the right time.

[Irish_Alley]

even with good fuel pressure this doesnt mean the injectors are getting signal to fire. dont know if its the only way but i have a diode tester set and thats how i check for signal

[74bluebowtie]

Could be a Passlock issue.  Google how to let the BCM relearn the key.  And there is a way to solder a resistor into the circuit to bypass it permanently.
When this happens the vehicle will usually crank but it shuts down the injectors.

[82oldskid]

sorry I haven't updated in a few days, was a long weekend.  Working on this and doin a clutch in a mustang at the same time, then took my woman to the hospital after she tripped and hurt her knee pretty good.  What a lovely weekend...  anyhoo, plugged in a scanner, got code P0335 - No signal from the Crank Sensor.  Checked power to the sensor, all good.  Checked all the fuses, good there.  Swapped the Crank Sensor, still no start, and getting the same code.  so, tonights game plan, picking up a set of noid lights, gonna check the injector pulses, and gonna check for spark.  This job reminds me how much I love my two 86 Chevy's, cause when something like this happens, it's a heck of alot easier to diagnose!

Either way, thanks for the responses so far.  keep em comin!

[bd]

Check and clean all the harness connections to the PCM.  Ohm out the PCM-to-CKP sensor wire.  Verify all the PCM grounds.

Read through PO335 - Crankshaft Position Sensor A Circuit Malfunction

[82oldskid]

well, just figured I'd update on this.  after having someone come by with an actual good scanner, and going through the  process of elimination, everything seems to be pointing to either the ECM or BCM.  We read some other codes that my cheap-o scanner couldn't, and apparently sometime in the past, there was a loss of power to the BCM.  Sucks, but at least I know I didn't screw anything up, as this was a prior issue.  So, yea, thats where we're at.  Just didn't wanna be one of theose guys who doesn't ever post what the final result was.  haha

Thanks to everyone for your assistance even so, I greatly appreciate it!

[Irish_Alley]

good luck with it