1999 Chevrolet Silverado 1500 - Page 3 - Answered Questions & Fixed issues

change distributor cap and rotor button sounds like it could be drawing moisture in the cap or could be maf sencor

4wd switch lit up , DTC'S - diagnostic trouble codes stored in the 4X4 control module . Which 4X4 system ? Transfer Case - NVG 246-NP8 (Two Speed Automatic) Transfer Case - NVG 261-NP2 (Two Speed Manual) DTC B2725 ATC Mode Switch Circuit Malfunction DTC C0300 Rear Speed Sensor Malfunction DTC C0305 Front Speed Sensor Malfunction DTC C0308 Motor A/B Circuit Low DTC C0309 Motor A/B Circuit High DTC C0310 Motor A/B Circuit Open DTC C0315 Motor Ground Circuit Open DTC C0323 T-Case Lock Circuit Low DTC C0324 T-Case Lock Circuit High DTC C0327 Encoder Circuit Malfunction DTC C0367 Front Axle Control Circuit High DTC C0374 General System Malfunction DTC C0376 Front/Rear Shaft Speed Mismatch DTC C0387 Unable to Perform Shift DTC C0550 ECU Malfunction DTC C0611 VIN Information Error

Trans case has a hole in it,,, or a plug has backed out,,,should not be able to see the chain at all,,,

Seems if i remember it could be one of two things. The control module is located right behind the dash on the left side of the steering column close to the ac vent. So close that condensation from the AC runs into the plug. The only other thing is the motor on the transfer case. You cold remove the motor and plug it up and get someone to move the switch for you. Don't forget to ground the motor while testing it.

check/ replace the light control module

I had this problem occur on another vehicle of mine and it freaked me out for awhile. But I found that the AC pushbutton was semi-stuck and whenever I went over a somewhat significant bump the controls would switch over to AC. I finally replaced the AC pushbutton and the problem went away. I am assuming that you have a pushbutton, right?

abs systems do not lock on the brakes they release the brakes when the wheels stop spinning and when the wheels start turning again apply the same brake pressure as before the wheels stopped spinning check the proportioning valve to the rear brakes to ensure that it is not acting as a one way valve and that is causing the problems if the compensating port in the master cylinder for the rear wheels is blocked that also will lock the rear brakes

This sounds more like a misfire under load than a transmission issue. This is one of the most misdiagnosed problems we see on a regular basis. The fact that it is only noticeable while going up an incline leads me to believe you likely have worn out spark plugs, and/or a weak ignition coil. While you do not have a check engine light on, this can happen when you have only a minor or very intermittent misfire. Once the misfire becomes worse or happens more often, the computer will turn on the light- or cause the light to flash indicating a serious misfire which could cause catalytic converter damage. Try having your garage monitor their scan tool data for real time misfires while driving it under a load such as the incline you mentioned, or even while brake-torquing the engine (pushing the throttle slightly while the transmission is in gear and the wheels are chocked and brakes applies) This can help duplicate the conditions where you noticed the issue. Monitoring the misfire data can help them pinpoint which cylinder(s) is misfiring and swapping spark plugs or ignition coils between cylinders can determine which component is causing the issue.

https://s1.postimg.org/482qy9l14v/wiper.jpg Click on the link. I always check voltage and ground, w/o ground also, it won't work. The top wires in diagram are voltage depending on what your trying to do? The black wire is ground. You can check ground by also using a test light. One end of test light touches battery voltage, the other end touches black wire terminal. If the lite comes on, the ground is good enough to work the test lite.

What transfer case does it have . Transfer Case - NVG 246-NP8 (Two Speed Automatic) Transfer Case - NVG 261-NP2 (Two Speed Manual)

Is the check engine light on.

With you. Looks like you have changed everything. Driving a '95 Odyssey - Love it. Has a Real transmission, and all the goodies I grew up with. Parts that make sense. So - what does Autozone say? About it's computers? Mine has only one, and it is ...lame. Is it throwing any 'codes'? Hubby is the expert. Hope to send this to him. JW

Motor is not turning in second direction to lower window. Either the new motor is defective or the device that reverses the electricity to the motor is defective. Regulator? Take motor out and feed it juice - will turn. Reverse polarity and it should turn in other direction.

Your brake an CV joint issue can't an won't cause your 4X4 problem . The 4x4 system has a control module which supply's B+ voltage to the switch . Checking for codes in the 4X4 control module should have been the first step . Your best bet , take it to a qualified repair shop . You don't have the knowledge or test equipment to fix this. SERVICE indicator (4WD/AWD) Lamp The SERVICE indicator (4WD/AWD) lamp is an integral part of the cluster and cannot be serviced separately. This lamp is used to inform the driver of the vehicle of malfunctions within the automatic transfer case (ATC) system. The SERVICE indicator (4WD/AWD) lamp is controlled by the transfer case shift control module via CKT 1567. Transfer Case Shift Control Module The transfer case shift control module uses the VIN information for calculations that are required for the different calibrations used based on axle ratio, transmission, tire size, and engine. The system does not know which calibration to use without this information. The direct battery supply line (CKT 1640) provides the power to the module and motor circuitry. Transfer Case Encoder Motor The transfer case encoder motor consists of a permanent magnet (PM) DC motor and gear reduction assembly. It is located on the left hand side (drivers side) of the transfer case. When activated it turns the sector shaft of the transfer case (clockwise or counter clockwise) to shift the transfer case. The encoder motor is controlled with a pulse width modulated (PWM) circuit within the transfer case shift control module. This circuit consists of a driver on both the Motor A and Motor B circuits. The encoder motor is bi-directional to allow the motor to shift the transfer case from 2HI or 4HI to NEUTRAL and 4LO positions. Do you know what DTC'S are ? DTC B2725 ATC Mode Switch Circuit Malfunction DTC C0300 Rear Speed Sensor Malfunction DTC C0305 Front Speed Sensor Malfunction DTC C0308 Motor A/B Circuit Low DTC C0309 Motor A/B Circuit High DTC C0310 Motor A/B Circuit Open DTC C0315 Motor Ground Circuit Open DTC C0323 T-Case Lock Circuit Low DTC C0324 T-Case Lock Circuit High DTC C0327 Encoder Circuit Malfunction DTC C0367 Front Axle Control Circuit High DTC C0374 General System Malfunction DTC C0376 Front/Rear Shaft Speed Mismatch DTC C0387 Unable to Perform Shift DTC C0550 ECU Malfunction DTC C0611 VIN Information Error

If the air stops blowing from the vents, the problem is with the blower motor. If it doesn't come on, try slapping the motor with your hand. If it starts when slapped, replace the motor. Do It Yourself Diagnosis and Repair

Finding a wiring diagram for the shift solenoid in question and testing for control (turn on signal ) from the PCM And checking to see if the solenoid is open is the proper way to find the problem . Not guessing and just replacing parts ! Check engine light on ? The PCM would set a code an turn on the Check engine light if a solenoid was open or if the circuit was open , shorted etc..... How many miles on the trans ? More then likely the reverse clutch has a problem .Before you start replacing parts you don't need take to a qualified repair shop and have it diagnosed . Hooking up a scan tool to check for codes an view data or inputs from the trans range sensor switch and outputs from the computer to shift solenoids . This would save you time and money

Sounds like the chock needs a little TLC.

besides the heated oxygen sensors being faulty, lean mixture codes also refer to intake/exhaust leaks ( cracked flex section of exhaust pipe at manifold , low fuel pressures /pump, faulty injectors , MAF/VAF,wiring and ECM

Does the code reader power up ? Does a message no communication show on the screen ? Is there B+ voltage at pin 16 in the DLC ? If all that is good try a auto parts store ,they check codes for free .

you will have to rebuild or replace the transmission if continued to use in damage condition will either destroy transmission or can cause and accident