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Think about how the vehicle is acting. Starts fine when cold, hard to start when warm. In these computer operated systems, the computer runs everything. Starts fine when cold: the computer has the engine in cold start mode putting more fuel in till it warms up. Temperature sending unit in the manifold sends a message to the computer telling it to stop the cold start mode and it stops dumping excess fuel into the cylinders and it runs fine. IF, mind you, IF the temperature sending unit is faulty, it's not telling the computer to stop the cold start mode and is flooding the engine with fuel cause it's sill in cold start mode. This is my take away on your situation and the temp sending unit is something to check to be sure it's functional. Check it out. I hope this WAS the answer to your problem my friend. It's typical. Luck to'ya Bro.
Being that there are misfire codes, (300 series P codes), and it's flooding I would put a fuel pressure gauge on it and try to check the injectors and the fuel pressure regulator for leakage. If the vehicle has sat for a while, 1 or more of the injectors may have stuck open. If the fuel pressure is way to high it can cause the pressure regulator to leak. See if that helps.
check your control modulator, or a problem I had with one of my cars is my car had an shut off fuel relay designed to stop fuel should the car roll over. my Chevy had a lot of problem I kept chasing and it ended up being the ECM (trucks computer)
how long has it been since a tuneup was done to the car.this maybe all that is needed.check the tps as these have a problem with hard start when cold at times.it pobably wouldn`t hurt to have the fuel pressure tested when cold.the map sensor can cause problems as well it this situation
a vehicles crank shaft sensor sends a signal to computer, as to tell what revolution the crank is on. you may not get a check engine light. check injectors for leaking in to cylinders, it can cause an excess amount of fuel in cylinder. this may be causeing the no starts and flooding smell. if it starts good warm then check the injectors for leaking. good-luck!! you may also have a bad coolant tempurature sensor. symtoms of a bad cts are--poor cold idle, stalling, slow idle speed, cold hesitation or stumble, poor fuel milage. ( will also ****** timing). its hard to say with out being there, so check out above. good- luck!!
replace your MAP sensor(manifold absolute pressure) the map sensor is the computer for your fuel pressure regulator telling how much pressure. Unless your tahoe runs like **** going up hill than it inevitably your fuel pump
Hello, yes the check valve is in the fuel pump assembly. The check valve is leaking and the pump will burn out soon. Unfortunately the aftermarket fuel pumps can be very unreliable. A good portion of problems we see on this site are from people who replace the pump sometimes twice and it still doesn't work.