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My2004 Yukon will start up run for about 35 minutes and shut off I have changed plugs and wires the fuel pump the cats and o2 seniors and it still dose it what could it be

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First you must determine if it is a fuel problem or a spark problem. When it dies, take off the air cleaner assembly and spray some starter fluid into the throttle body to see if it will start. If it does, you have a fuel system problem and will need to hook up a fuel pressure gauge to the system to check the pressure. If you have no pressure, you may have a bad connection to your pump or relay. If it does not start, check to see if you have spark to a spark plug. If you have no spark, you will need to hook up a scanner to check all of your relays and sensors.

Posted on May 16, 2017

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Posted on Jan 02, 2017

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