The engine turns over and sputters initially but then just cranks. There appears to be fuel in the fuel pressure release port on top of the engine. The mechanic ran a check on it and the code it saying something about the key. The key does not have a chip in it to cause problems.
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Re: 2005 5.3L silverado wont start
Gm has several anti-theft systems. Nowadays the key does not have to have a chip in it. Your key passes through the Pass-lock system when you place it in the ignition. Hook a battery charger up to your battery. Then turn your key on and leave it sit for 25 - 30 minutes. Try starting your vehicle. If this simple reprogramming process does not fix the problem you will have to take your vehicle to a GM dealership which has a TECH 2 to solve this problem.
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Make sure battery has a full charge. Engine cranking, if you have no spark at the plugs, no fuel injector pulse, and other than the initial prime, no fuel pressure, check for rpm signal, that comes from crank sensor. If no rpm signal, the vehicle won't start. W/o testing I can't be sure the problem is the crank sensor, there might be other issues? Just my opinion.
That system is self priming, my first thought would be crud from the bottom of the tank got stirred up due to low fuel, and some small microns of dirt got sucked into the system and took out your fuel pump. Dirt naturally gets into everybody's tank, nothing you can do about it. My first try would be to cycle your key a few times to purge the system, not to many though as yes fuel injection can and will flood, if that happens to clear it out hold your foot to the floor till it starts then back to normal. Dont over rev you engine. Another thing to check is to remove the vacuum line from the fuel pressure regulator and smell it, if it smells like gas then the pressure regulator is bad, common issue.
But this wont keep it from starting only makes for a long start and lower fuel economy. Hope this helps.
On Chevrolet fuel injected vehicles holding the accelerator on the floor during cranking activates "clear flood mode " that turns the fuel injectors off the fact that it then starts tell me that the engine is flooded or the ECT (engine coolant temperature) sensor or circuit is telling the ecm the wrong temp several other causes are blown fuel pressure regulator, low fuel pump pressure, low compression or faulty coil pack
Check your fuel pump pressure, it is probably down in the 50 lb range and it requires a bit above that to start. Once it starts it will run on that pressure. This is a chronic problem with these, my 1998 2500 was a GMC but it's the same vehicle. I put 385,000 miles on it with no engine or transmission trouble but I was on fuel pump number six when I sold it.
If it's not leaking fuel under the vehicle, the problem could well lie in a faulty Fuel Pressure Regulator.... If the rubber diaphram in the FPR becomes compromised, your described symptoms appear due to fuel leaking into the intake and not leaving the fuel line w/ injectors with enough initial pressure to instantly start the car.
Simply remove the vacuum line which is connected to the fuel pressure regulator then insert the key and turn to the "run" (not "crank") position. If fuel squirts out where you disconnected the vacuum hose, then this is definitely your problem.
i have had the same problem.the solution is the fuel pump! i know you got pressure and it runs so how can it be the fuel pump? the pump is losing its prime you are getting pressure just no volume thats why its crank off crank off the system is priming itself again kinda like a weedeater or similar motor fuel is there just not enough of it to the injector To check this hook a pressure gauge turn on key turn off key release fuel should be plenty but if tis just a few drops thats it hope this helps
no gas in the engine
faulty tank switch if you have dual tanks
in tank something blocking the filter
fuel filters clogged
one in engine
one located on chassis by gas tank
one located in the tank called sending unit this has filter on it
fuel injectors need cleaning