Question about 2003 GMC Yukon XL
Dye was ran through my system and no leaks found in easily visual areas. Its a major leak. When we charged it, you could smell a distinct smell and it was completely leaked out within 24 hrs. Also the computer is saying I need to replace the knock sensors and now the reduced engine power is coming on more frequently. Used to every few months and now 1 outta 3 times driving it happens. Seems to burn more gas as well. Needless to say, Ive parked it until the problems can be resolved. I have almost 260,000 miles on it and have been the only owner.
I do not know what was done so i would check the oil for a milky color, if yes it has a bad head or head gasket, if no then pressure test the system and confirm it is leaking out then check the entire radiator and all the lines and hoses make sure the hose connections are not leaking at the radiator and drain, the overflow bottle could be cracked or leaking where the drain hose fitting is. One would think if it is leaking that bad it would be visible some where. check the radiator core for pinholes. if ithas tailoring check the coolers and lines for leaks and the cooler for pinholes.
Posted on May 04, 2017
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Posted on Jan 02, 2017
What you have is the torque converter clutch,cycling on and off.
When it is off.your rpm will go up and your milage will go down
First-check to see if your brake switch, on the back of the brake peddle, is loose or misadjusted. When you apply the brakes,the first thing to happen, is that you unlock the converter,so your trans is not connected directly to the motor,or you would stall. Then below 42 MPH,your trans is working off the converter, as a pressure multiplier ,based on rpm
Second- switch okey. You remove trans pan and change TCC Solenoid.
Let me know if if you need more guidance
Posted on May 08, 2010
Testimonial: "Thank you for the quick response. Figured it to be something with the trans. Gives me a good place to start and a good reason to clean out the other stall in my garage to work on it. Thanks again!!"
I'm going to go out on a limb and sugest that you look for melted wires in the engine compartment. That would explain the burning plastic smell. And a bare wire grounding on your engine could cause about 100 diferent problems.
Posted on Sep 20, 2010
SOURCE: I just bought a 2005
Thanks for choosing FixYa and welcome to the site. These big engines burn oil a lot, but not that much. If you haven't already, you need to get under the engine and check the back wall of the motor for oil leaks. Since there is no black smoke, your fine on the back end. Have you checked the back wall from underneathe? Also, is your check engine light on? Thanks.
Posted on Aug 16, 2011
SOURCE: Had a code come up
Have you erased the error code in the CPU of your car? also sometime it can be the the control valve in the injector. I would get the car diagnosticsdone properly and than see how it goes.
Posted on Sep 18, 2011
SOURCE: truck was running rough, threw a code 44. new o2 sensor, cleaned throttle body, new plugs and wires. checked fuel filter. found and repaired a major vacumn leak. it still ran rough and now threw a new
Glad you got it fixed. Chasing a problem can be very frustrating.
Posted on Sep 17, 2012
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