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1999 GMC Yukon - Page 9 Questions & Answers
Truck starts and drives for a while then quits. After waiting a time it will start again
The
following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem.
The
engine and the automatic transmission (transmission control is only
for automatics, engine is still computer controlled no matter the
transmission type) in this vehicle are computer controlled and in
most cases when a fault occurs a fault code is stored in the memory
of the computer control module. There are exception to this, such as
the Mass Airflow Meter and fuel pressure problems. What must be done
is to have all the basic testing done such as a scan of the system
for fault codes as well as a check with a live data scanner tool for
engine functions that are not within range of normal, a trained
technician is required to know what is correct and what isn't, then
based on careful diagnostics done from a factory repair manual the
correct part is replaced or the wiring repaired or the computer
replaced (known as the PCM), which is very rarely the problem. Other
basic checks must be done as well such as mechanical problems with
the engine as well as engine state of tune and mileage on the engine.
The transmission can have mechanical issues as well such as no gear
engagement at all or a failed pump or other pressure related
problems. Also engine mechanical problems can and do cause many
drive-ability related problem such as rough idle and other symptoms.
1999 GMC Yukon. Rear AC cooling great. Font AC not
If the rear is working well and front is not I would suspect a blend door or actuator issue in the front.Double check and see if you can hear anything moving when you are adjusting temperature from hot to cold.Also check and make sure the air flow moves properly from defrost to vents and floor etc.
Wont start..i put gas direct and i can run it from here to china
This is common , the problem will be low fuel pressure due to weak fuel pump. this can be check with a fuel pressure tester, the fuel pressure regulator could be bad, thats located inside the upper intake, and last spider injection system.A fuel pressure tester can answer and slove this problem, i will bet it is a weak pump, the pump will run the truck but will not start it, sounds crazy but ture, all it takes is about 3 to 4 psi low and it will not start, it may also be a bad pressure leak down valve which is part of the fuelpump, good day
Changed! cam sensor, crank sensor, oxygen sensor,
change distributor. this year model is easy. there's only one way to put distributor in/only goes in as long as you note position of rotor and set it back in with rotor pointing the same direction , no timing adjustment on it, it's controlled electronically.
Where is Orfice located
if you are looking for the ac oriface tube for the ac it is inside the smaller line look near the connections for a crimped section about 3inches from the connection
1999 gmc Yukon power door locks diagram
I am sorry but I regret to say that Fixya.com doesn't have any wiring diagrams available for free downloading due to copyright laws. You can however gain access to the factory service manuals and wiring diagrams and all factory service letters at this site for a modest subscription fee I am told. www.alldatadiy.com
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