20 Most Recent 2009 GMC Yukon XL - Page 4 Questions & Answers

if no leaks found at the hoses. check your oil cap .if no gunk found . check for leaks at the heater on the drivers floor. if ok change your expansion bottle cap .

bad air/fuel mixture could cause rod knock like that, which is a for of backlash or whip like action. Detonation, like very poor grade of fuel. IF your engineis running really rich, the extra rich fuel goes by your piston rings and thins out your engine oil. If you have a bad ROD bearing, it is probably TOO LATE. CLEAN YOUR THROTTLE BODY and IAC valve, since these things fine tune your FUEL/AIR mixture and PREVENT rich running. GOOD LUCK!!

check for vacuum leakage in emissions lines..and see if the ignition chip is getting hot ant shutting off.. also check the autoshutoff relay..it controls the ignition and the fuel pump..

I've had the same problem with the reduced power and tps sensor which is your gas pedal. I replaced it but the problem still existed. I then changed the throttle body and harness to the throttle body but still had the same problem. So I traded the vehicle. I did everything the dealer suggested and I just cut my losses. The Yukon overheating would be a different problem and should be easy to fix.

There are only two screws on most TPS SensorsEither a T20 Torx head or a small Hex & of coarsethe wire connectorA Code for that or any sensor, doesn't mean or tell youto replace it.Codes are used along with reference material & diagnosticcharts,to decide what & how to test thingsNothing ever gets replaced, that is not understood orhas not failed a testTo do so otherwise, is the Push & Poke,Wish & HopeDiagnostic theory, of throwing parts at something,thuslearning nothing.You may have to use a hair dryer to soften the threadlocker on the screws

check your linkage

It could be a warped rotor or an out-of-round drum but it might also be loose wheel bearings, a bent axle shaft or loose brake parts. Or you might just be feeling you ABS kicking in. If it is one of those parts and you need to replace it, consider looking online for used auto parts.

Powertrain Computer Module (main computer)Same as ECM or ECUDo you not use Google to research thingsStudy Vehicle OBD2 Systems

Doesn't matter what light is on your dash,or what system has a problemYou read your owners manual,then you check for codes,every time you have any vehicle issue

if you need pin code reader, please view careucar.com

towing package , the blue wire control the charge coming from the battery sometime could be a big red wire(fusible link or inline fuse near the battery or fire wall