Question about 2000 GMC Yukon XL
Idle valve on the intake needs cleaning and the lower air intake pipe aswell
Posted on Feb 12, 2014
If the alternator is weak, and you have accessories like the headlights or blower motor running, and the RPM drops below 600, the voltage could be below 12. It would depend on the load, RPM, and several other factors.
Posted on Feb 12, 2014
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Posted on Jan 02, 2017
SOURCE: 2002 GMC Sierra High Voltage
could be just a bad gauge,thak it too auto zone and have them test it while its on the truck,if it reg the same on their tester then your got a short
Posted on Mar 01, 2009
Sounds like you have a dirty or bad mass air flow sensor.It is located by the air filter in the air snorkel.What you can try first is just disconnect it and see if it makes a difference.When I say disconnect I mean the wire connector not the whole thing.You can remove it and clean it.Just go to any part store and get some mass air flow sensor cleaner and clean it.Make sure you install it back with the arrow towards the air flow which would be towards the motor.After cleaning just let it air dry.If this does not fix it you may have to replace it.It usually works if this is the problem.Another thing you can do is have someone check for codes.It could have a code for this sensor and the check engine light might not have come on.Let me know what you find out.Good luck.
Posted on Nov 30, 2010
Testimonial: "Thanks, this helped for a little while then I had to replace the MAF and that also worked for awhile. You are great at explaining!!!"
The 4.3 engine should have 20 to 30 psi at idle cold and around 50 to 60 psi running down the road. Has this engine had regular oil changes? If not the problem could be sludge build up. The oil pressure sending unit could be the problem. If in question about the sending unit install a mechanical gauge and watch the pressure.
Posted on Jan 02, 2011
SOURCE: My Service engine like is
If your check engine light is on and you find a P0420 code, it's a catalytic converter fault which is an emissions issue, not a performance issue that affects the way the engine runs. The catalytic converter is like an after-burner. It oxidizes (burns) any residual fuel vapors (unburned hydrocarbons or HC) in the exhaust. It also burns any carbon monoxide (CO) in the exhaust. The exhaust must meet federal emission standards, and if a problem exists that causes emissions to exceed the federal limits by 150%, the OBD II system is supposed to catch the fault, set a code and turn on the Check Engine light. A new converter can cost $600 to $1000 or more if a new car dealer or repair shop does the job, or maybe half that amount if you do it yourself.
Posted on Jul 13, 2011
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