2000 Gmc Yukon Denali wont start i changed fuel pump and filter

Have you confirmed that its not a security issue? Did it die suddenly or was it bogging out for a while? Have you scanned the engine?

This is the Mass Air Flow Sensor. It's a screen-like device located on the air intake line to the throttle body. It measures the flow rate and density of air entering the engine. The code can mean a few possible things:

1. Dirty Air filter
2. Dirty MAF Sensor
3. MAF Sensor wiring problems

Try replacing the air filter first. Remember that engine codes must be reset or they will remain in the computer even after repairs. If that doesn't work you can remove the MAF and clean it with a MAF Sensor approved spray cleaner. If you use the wrong cleaner you will destroy the MAF. If cleaning the MAF don't work, then replacement is indicated.

When a fuel pump goes bad,you wont start,the signs before a failing fuel pump is excessive cranking, and the engine cough through the intake, a check engine light stating lean bank one and lean bank two.You would have a MAF (Mass air flow code).

You use the spark plugs recommended in your owners manual

Any brand but same OEM electrode configuration


You can not add horse power to any vehicle without
modifications,common sense.


Change front O2 Sensors at 100,00 miles
Clean MAF Sensor

Forget the fuel filter if in the tank

• PCM software needs to be updated
  
• Vacuum leaks (Intake Manifold Gaskets, vacuum hoses, PCV hoses, etc.)
  
• Mass Airflow Sensor (MAF)
• Plugged Fuel Filter or weak Fuel Pump
• Plugged or dirty Fuel Injectors

the fuel filter would be the first place i would go, especially if it has not been replaced recently. it can cause slow priming of the fuel pump, resulting in hard starting. in addition, if your truck has never been tuned up, a set of spark plugs could make the world of difference - i believe on your particular truck it is recommended to change them at least every 100,000 M. good luck!

1.-remove trottle body and clean it really good 2.-clean your EGR valve with some carb cleaner 3.-remove air intake pipe and clean MAF sensor with MASS AIR FLOW SENSOR CLEANER,make sure your air filter still in good condition. i did this on my 02 xl denali now the problem its gone!trust me!hope this helps on yours too

i now for a fact that it is the egr valve . carbon balls in side you have to take it of and clean them out

Did you change the fuel filter? also did you clean the inside of the MAF sensor w/ MAF spray cleaner?

Did you try to replace the starter cable? is the Truck turning over or just clicking.? If it's turning over and not starting. Best guess would be one of two things. Knock sensors Located under intake manifold. they get wet and deteriorate or the fuel pump. I've replaced all three on mine. 233k still running strong...