Question about 2002 GMC Yukon Denali

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Denali won't start on the first try. Then when you try again and let it crank for a few seconds it starts and runs fine. It has 90k and I changed the fuel filter and after I check the fuel pressure, it was 51psi. Also I put it on the computer and all seems fine. Any help would be great, thanks.

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Check with advance auto store and ask if 51 is proper, thinking it should be 65 or better

Posted on Oct 16, 2010

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Posted on Jan 02, 2017

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1 Answer

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I have a 2001 Yukon Denali that won't start. It


You need to make sure that the engine has what an engine needs to run. The obvious ones are fuel and spark. Make sure there is at least 40LBS of fuel pressure at the injector rail when cranking. If so, you will need to make sure the injectors are opening. If you verify that the engine is getting fuel you need to make sure there is fire to the plugs when cranking. If it is getting fuel and spark, you need to make sure there is enough compression for the engine to run. And lastly, if it has everything else it needs to happen at the correct time.

Dec 19, 2017 | 2001 GMC Yukon Denali

1 Answer

My 96 yukon wil not start. Sounds like it will crank over but won't. It is not the fuel. I changed the ignition coil still won't start.


try spraying some carb cleaner into a vaccum hose and see if it will run. If so then you have ignition but no fuel delivery. If not then you have an ignition problem. make sure you hear the fuel pump hum when you turn the key to the run position. It should run for +/- 5 seconds then shut off. remove gas cap and listen for fuel pump operation through the fill hole. If you can hear the pump then you have a fuel injection issue. If the engine starts and runs for a few seconds then shuts off then you can suspect the crank or cam position sensor. The fuel pump runs through the oil pressure switch which could also be an issue.

Are you able to start the truck with application of the gas pedal?

Sep 22, 2011 | 1996 GMC Yukon

1 Answer

My 2002 Yukon Denali XL shut down while my wife was driving it on the highway.When I reached her the truck's battery was completely dead. I purchased a new battery and now there's power but the...


Define - It attempts to turn over but won't catch and run ???? When you turn the key to start does the starter engage an spin the engine ? This would be a crank no start condition . If the starter doesn't engage an spin the engine this would be a no crank no start condition . Sorry to ask but i have only been an auto tech for thirty years an have heard a lot of different discriptions for these simple actions . crank no start or no crank no start . Very different diagnostic procedures . So when you turn the key to start , does the starter engage an spin the engine ,but won't start an run ?

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1 Answer

98 Chevy blazer won't start up but will crank ,,


Try giving it a shot of starting fluid. You don't say if it's actually firing. If it tries or runs for a few seconds off of the starting fluid then try changing the fuel pump relay. It's inside of the glove box on the left hand side behind the little door. If that doesn't work it's most likely the fuel pump.

Jul 21, 2011 | 1998 Chevrolet Blazer

1 Answer

Takes multiple times to start


I think you have a faling fuel pump or a bad pressure regulator allowing fuel pressure to bleed down when the engine is off.
Try this test - When you start the car for the first time of the day, turn the key to "ON", wait a few seconds, turn the key off. Wait about 15 seconds, turn the key to "ON" again, wait a few seconds. Then wait one final time for 1 seconds and try starting the car. If it starts right away, that means fule pressure is bleeding of due to a bad check vavle int he fuel pump, a bad fuel pump or a bad pressure regulator.

The reason for the procedure is because when you turn the key to "ON", the fuel pump runs for 2 seconds and then shuts off if the engine is not running. The 15 seconds wait is for the power and fuel pump relay to cycle off before it will run the pump again.

Let us know how the test comes out. The fuel pump is in the fuel tank and hums when it is running.

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