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Re: 2002 yukon xl no power check engine light
Denalis are famous for clogged fuel filters. Change the fuel filter first and see what happens, Get the code for the check engine light. It could be you have a clogged EGR ports. Remove EGR valve and clean out the ports, replace with new gasket and see what happens. Advise of results.
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You need spark at the right time, fuel pressure at the injectors, and normal compression. Have the spark plugs been changed in the past couple of years ? Have you checked the fuel pressure to see if it is enough ? Have you sprayed carb cleaner into the throttle body to try to make the engine try to start ? Does it sound like it has normal compression when cranking ?
Check the fuel cap!! If the vacuum relief is not working it can impede the fuel flow and cause the engine to shut down or not restart after a stop. Waiting usually gives things a chance to stabalize and the engine will restsrt. When this happens again try loosening the cap and see if the engine will restart.....If it restarts immediately, REPLACE the fuel cap..Do Not leave it loose because this will cause other problems. If it is not the fuel cap the problem may be the filter, the fuel pump, or aome other fuel system malfunction.