02 Tahoe Won't Start - Need some help please

[austexparts]

I have a 02 Tahoe that wont start. I thought maybe I ran it out of gas (the low fuel light was on), so I added about 4 gallons and it still won't start. I hear the fuel pump come on. The engine turns over, and when the engine turns over a little black smoke comes out. I check all the fuses and I didn't find any what were blown. Any ideas? I read that it could be the Passlock system? Or the BCM? By the way what is the BCM? Any help would be greatly appreciated....Thanks

 

[Sepiroth]

BCM= Body Control Module.

You ran your truck outta gas. All was right before, I'm assuming. I would check your fuel filter.

The black smoke is from unburnt fuel. Check to be sure that your truck has spark.

 

[austexparts]

Thanks for the reply. I'm curious, if I'm getting black smoke form unburnt fuel, I would assume that the engine is getting fuel. Could the filter be a problem? I hear my fuel pump coming on when I turn the key, could it still be bad?

 

[u2nv]

motors really relly on fuel psi to run even though you here pump may not be enough psi. get a psi gauge and hook it up to shraider valve on pass side under eng cover engines with vin code V,T,U is 55-62 psi and vin Z is48-54 psi that is key on engine off specs. then u can also check for spark. if you need anything else or you get awnser to these steps and need to go further in diag let me know.

 

[Fortune50]

How many miles on it? Truck's tune is up to date? Checked for spark yet? Does the tachometer move while it's cranking over? This can point to a problem w/ the crank sensor if it doesn't move.

 

[disem]

When my Tahoe is left with little fuel it won't start before I fill at least 1/4 of the tank!!! That's 4-5 gallons.

 

[austexparts]

figured it out

It turned out to be a passlock issue I think. I read somewhere if you put the key in the ignition and leave it in the on position it resets the passlock. So I left the key in the on position for about an hour and it started right up.

 

[Grebbler]

Another tidbit to file away for future battles with these computerized contrivances.:mpr:

Thanks.

Ed