How can i fix a 99 chevy tahoe that wont start?

Question

Ran a diagnostic test at auto zone and they said oxygen sensor and cylinder 5 was misfiring...replaced plug and wire...the engine sounds like it is trying to start and suck up gas but it wont start so i changed the fuel filter and put 2 quarts of oil in it and used my battery jumper to try to jump the car and it started right up and ran for 2 days but now wont start again...what should i do?

Answer 1

Is your engine turning over? If so then make sure that when you turn your key to the on position and you should hear the fuel pump pumping. Can you hear it? it should be a buzzing sound, if not then your pump just whent bad. If your enigne is not turning over then that means that your battery died again which leads to either a wiring problem or an alternator problem. How to check to see if your alternator is bad, make sure your battery is good at this time, go ahead and take the positive post off the battery (will cause no harm to you) then after holding the post in your hands for about a min or two if your engine dies then you just figured out that the alternator is bad.

Answer 2

It very well could be the pump but you will need a pressure guage to see what the pressure is hot cold and how long it will hold, also if there is a 5 psi difference there is a good chance the engine will not run so you will need to know the factory pressure to start. Also you should find a scanner so that you can see if there are any codes in the system to get you pointed in the right direction so you dont have to waste your time taking guesses, and pulling the fuel line off to see if fuel comes out is one of them

Answer 3

Sounds like you either have a bad battery, or your alternator is broken.

Answer 4

did ya check to see how much fuel preesure you have ??