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Posted on Jan 02, 2017
you may have two oxugen sensors on your yukon. if so the oxygen sensor that controls that bank may be bad. from what you mentioned in your complaint, it sounds like it is the oxygen sensor.
Posted on Dec 24, 2008
Most fuel injected vehicles have a relay that controls the fuel pump so after the ignition switch has been on for about 5 seconds and the engine is not running, the fuel pump automatically shuts off.
I don't know what your original problem was, but I think if the car runs normally, you have probably fixed your problem. If you don't have a manual, you can probably go to the library and take a look at a manual that covers your vehicle.
Posted on Jan 16, 2009
fuel pump check valve doesn't cause pressure loss, just hard starting cold, the check valve is part of the fuel pump, so to replace the valve u must replace the pump. do not use anything but the orig style pump, here is the part number from THE OE PUMP MAKER AT www.rockauto.com
DELPHI Part # FE0071 PRICE $124.99
Posted on May 05, 2009
SOURCE: 96 Tahoe no Cold Air
Yes... you are most likely low on freon as the compressor will cut on low pressure before vacuum.Depending on ambient temps and head pressures your running ,you may see low side pressures at 50. Automotive refrigerant (134a) is not far from matching the degress to low pressure....for instance 50 lb low side pressure will give you approx 60 degrees cooling at the vent.Once cabin temperatures are met is when you can expect that suction pressure to lower and stabilize.You would be better off watching high and low pressures to get the full picture of whats going on here...good luck
Posted on Jul 22, 2009
Fuel pump is bad. At idle pressure should read 50 PSI. Replace with original manufacture fuel pump after market pumps will burn out fast and are unreliable from my experience. Also could have a bad fuel regulator but that only works while driving down the road full throttle. You can unhook the fuel rail pressure regulator and that will give it full fuel and the pressure reading should read 60 PSI while it is running. If you turn the engine off and turn the key to run position it should read 50 PSI and hold for 60 seconds, if it drops below 30 PSI after 30 seconds Pump is defective. Many pumps are going bad here of late as people have been running them less than ¼ tank and this kills the pump. The fuel cools and lubricates the pump so the lower the fuel level the worse it is on the pump below ¼ tank. Not to hard of a job to do if you want instructions let me know.
Posted on Sep 28, 2009
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