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1997 GMC Yukon Questions & Answers
97 yukon not shifting after 1st
Check the transmission fluid level with the vehicle idling in park. If you do not see fluid on the dipstick then add one half quart at a time until it is in the hash marks on the dip stick. be sure to let the transmission (DexIII or mercon) completely drain down the dipstick tube or you will get a false reading. Shut off engine to avoid having to warm up the transmission to get an accurate reading and possibly causing (more) damage then may already have been done.
1997 GMC Yukon runs great but starts hard
That's often a sign of a failing check valve in the fuel pump. Try this. When you turn the key to RUN, the fuel pump activates for 2-seconds to boost any lost pressure. Try turning the key to RUN, then OFF and repeat three times. If the engine starts right up, you probably need a new fuel pump. The real test is called a leakdown test where the shop throws a pressure gauge on it and leaves it overnight. If it loses more than 5-10-psi, the check valve is shot. Can't be replaced separately .
I have a 97 Yukon with the following problem...I
Make sure that the starter solenoid is being activated and getting power to the starter. All battery connections and starter motor connection must be squeaky clean since any resistance in a 12 volt system may have a serious impact on power flow to device. Ignore the radio, heater etc during startup - the car is designed to turn them off when you turn the key to start so all power goes to the starter motor only.
I have power to the door lock switches on the drivers door but the locks do not work nor does the back hatch or the switch at the back hatch that controls all the locks in the vehicle. Do the locks g
Power Door Locks Circuit Description
The power door lock system incorporates door lock switches on both front doors and on the RH D-pillar, door lock motors in all passenger doors and in the RR cargo door, a door lock relay and a door lock control module.
Power for the door lock switches and the door lock control module is supplied from the CIG LTR fuse 13 through CKT 640 (ORN). Power for the door lock relay is supplied from the PWR ACCY circuit breaker through CKT 540 (ORN). Ground for the door lock relay is supplied from G202 through CKT 150 (BLK) and ground for the door lock control module is supplied from G400 through CKT 150 (BLK).
The door lock motors are reversible and both sides are connected to the normally closed contacts of the door lock relay. Those contacts of the relay are connected to G202. When any of the door lock switches are placed in the lock position, voltage is supplied through CKT 195 (LT BLU) to the relay lock coil. Since the other side of the lock coil is connected to ground, the coil is energized and it pulls the lock contacts closed. Voltage is then supplied through CKT 295 (GRY) to all the door lock motors and the doors lock. The unlock function operates in much the same manner except that when any of the switches are placed in the unlock position, voltage is supplied through CKT 194 (WHT) to the unlock coil of the relay and CKT 294 (TAN) supplies voltage to the apposite side of the door lock motor and the doors unlock.
Door Lock Control Module Description
The door lock control module is used on vehicles equipped with cargo doors. The purpose of the module is to lock the cargo doors after a lock cycle has been commanded from any of the door lock switches with the cargo doors open. When the RH cargo door is open, the module receives a ground signal from the closed contacts of the rear door jamb switch on CKT 1897 (ORN/BLK) to G400. When a lock command is received, the module retains this input until it receives an open input from the rear door jamb switch. Then the module sends a lock command through CKT 194 (WHT) to the door lock relay and the doors lock.
Rear Cargo Doors Description
The power door lock motor will not operate unless the rear cargo doors are fully closed. The power door lock motor is in the right cargo door. The contactors are on the rear cargo door opening on the body and on the right cargo door.
How many o2 sensors does a 1997 gmc yukon have?
Your Yukon has only one O2 sensor. If black smoke is present at exhaust pipe while at hi-way speed, it is probably staying in open loop (fuel mapping). most likely a coolant temp sensor. Before changing any parts, perform an OBDII diagnostic test to see the stored fault history. Replace cheapest components first (ie air filter, every 40,000 miles)
When stop, the Car is On "D" but not moving!!
There is a problem with the torque converter or transmission. Sometimes cleaning out the transmission with new fluid and filter will solve such issues, but no such luck this time. Take it to a reputable transmission repair shop for an estimate. In the meantime, shift to "N" when you must apply the brakes, then shift to "D" when you want to go again.
You may be able to save money by removing the transmission yourself and taking it to the shop, but let them see the vehicle first to confirm the diagnosis. On front-wheel drive cars, pulling the transmission is a major job; you will probably need to hoist the engine and transmission out together, or disassemble most of the front suspension.
Code p0157
DTC P0157 HO2S Circuit Low Voltage Bank 2 Sensor 2
Check for the following:
HO2S wire - Sensor pigtail may be mispositioned and contacting the exhaust manifold
Intermittent ground in the wire between the connector and the sensor
Poor VCM to engine block ground
Lean injector(s). Perform Fuel Injector Balance Test for the 5.7L or the 7.4L.
Fuel contamination. Water, even in small amounts, near the in-tank fuel pump inlet can be delivered to the injectors. The water causes a lean exhaust and can set a DTC P0151
Fuel pressure. System will be lean if pressure is too low. It may be necessary to monitor fuel pressure while driving the vehicle at various road speeds and/or loads to confirm. Refer to Fuel System Diagnosis.
Exhaust leaks. If there is an exhaust leak, the engine can cause outside air to be pulled into the exhaust and past the sensor.
Vacuum or crankcase leaks can cause a lean condition and/or possibly a high idle.
If the above are OK, it is a faulty HO2S.
Never solder the HO2S wires.
Stalling when hot
This could be a few things. Ignition wires that have become worn or broken. A distrubuter cap and or rotor that is worn. OR. in the intake the fiuel delivery system aka the spider is leaking at one or more places. This is common as is the above. Check your fuel filter too however though the free should be checked it is not likely the cause in this case.
Whyi canti fols back down the back steat in my gmc sierra
those have bad handles. Take the handle off by using the proper torx bit and check the stud for full operation of the seats potential by using a pair of visegrips carefully crimping the end of the stud and then pull to check movement sometimes the bolts on the inside of the seat come loose for the back rest and need tightened.
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