GMC Cars & Trucks - Page 3 - Answered Questions & Fixed Issues

The low oil pressure will not affect the engine rpm. You need to find the low engine idle problem and correct it first. Could be a simple throttle body cleaning. This would clean out the idle control valve which could be the problem. Most service centers will be able to do that.

Sounds like it's worn out, best take into the shop for repair, should only cost $20 with parts.

1 - PPL
2 - RED/WHT
3 - LT BLU
4 - DK GRN/WHT
5 - DK GRN
6 - LT BLU/WHT

Check here..... https://www.2carpros.com/questions/gmc-sonoma-1991-gmc-sonoma-firing-order Best to you.

It's a guess, but yes, you have one or more stuck injectors and when you power off the pressurized gas in the system is going into the combustion chambers and seeping past the piston rings. When you pull the relay, it is running on the fumes from the oil pan. You need an auto electrician, a professional grade scan tool computer can diagnose in 30 minutes. https://www.google.com/search?q=mobile+auto+electrician+near+me ..

Idle air solenoid and/or intake vacuum leak.

Service Manuals https://www.google.com/search?q=1994+GMC+Sonoma+4.3+service+manual How to Change A Heater Core on a 1994 GMC Jimmy, (Chevy ...

Question edited for clarity and toss in some CAPS. Question moved to model category. Help in the link. Basically something in the linkage was come apart. The noise is the electronic solenoid. It is the same for all models, you just have to get in there. https://www.google.com/search?q=2008+GMC+Envoy+hatch+won%27t+lock ..

Depends on what engine, but if I remember right, it is in the base of the distributor on the 4.3 and 5.7

It doesn't have one

https://search.yahoo.com/search?fr=mcafee&type=E210US1494G0&p=fuel+pump+relay+1994+gmc+safari+location

You have AWD? full time all-wheel drive. Transfer Case Description and Operation The Borg Warner (BW) model 4481, RPO NR3 transfer case is a one-speed, full time, all wheel drive (AWD), transfer case. The transfer case provides power to both axles, through an external planetary type differential, which has two different sets of pinion gears. The planetary differential provides a 40/60 torque split, front/rear, full time. This means both axles are constantly being driven for maximum traction in all conditions. The transfer case external type planetary differential functions the same as a typical rear axle differential. The transfer case differential pinion gears function as the spider gears, and the sun gears function as the side gears. The following actions occur because of the planetary differential: • If the vehicle is on a hoist, the front propeller shaft can be rotated by hand. • The vehicle cannot be driven if one propeller shaft is removed. • Operating the vehicle on the hoist can damage the differential pinion gears, by over-spinning. • Operating the vehicle with one propeller shaft removed causes over-spinning of the differential pinion gears. The BW 4481 design of the planetary differential allows the use with the Vehicle Stability Enhancement System (VSES) vehicles. The VSES takes use of the planetary differential, by applying braking to a tire that has less traction and dividing the engine torque to the other axle. The BW 4481 case halves are high-pressure, die-cast magnesium. Ball bearings support the input shaft, the front output shaft, and the rear output shaft. The transfer case requires DEXRON®III ATF GM P/N 12378470 (Canadian P/N 10952622), which is red in color. This system does not have an encoder motor.

Help in the link https://www.google.com/search?q=1995+GMC+Sonoma+SLE%2C+extended+cab%2C+2+wheel+drive.+Replacing+the+5+speed+manual+transmission ..

I thought I answered this? Want to bypass your vehicle security system? The short answer is you can't! All modern cars have alarms and immobilizers. There is a transponder in the key and a receiver around the ignition lock. If both are present, the ECM (engine control module) or BCM (Body Control Module) releases power to the ignition circuit or the starter. When you turn the key, the starter spins the engine and you get a spark. If any one of those three items are not in the chain, you get the engine to turn, but no spark. There is no way to beat the system. You have to fix what is wrong, not find a way around it. The immobilizer is in place to stop exactly what you are trying to do. .. Posted by ADMIN... on Mar 26, 2016

Question edited for a lot more clarity. Question moved to model category. This says it doesn't have one. https://www.justanswer.com/gm/4n355-crank-position-sensor-located-95-gmc-safari-4-3.html https://www.google.com/search?q=1994+GMC+Safari.+Crankshaft+Position+Sensor+location ..

What size engine ? 4.3 L vortex P0300 random misfire code is usually associated with vacuum leaks , but could also be low fuel pressure , plugged fuel filter , fuel pump problem , clogged injectors etc... doing fuel pressure an flow testing would confirm or eliminate that as a problem . Fuel injector balance testing would confirm or eliminate clogged injectors .

https://www.scosche.com/media/guides/ct1031.pdf

PART COLOR LOCATION 12 VOLT CONSTANT RED (+) @ IGNITION SWITCH HARNESS STARTER YELLOW (+) @ IGNITION SWITCH HARNESS STARTER 2 N/A IGNITION 1 PINK (+) @ IGNITION SWITCH HARNESS IGNITION 2 WHITE (+), See NOTE #6 @ IGNITION SWITCH HARNESS IGNITION 3 N/A ACCESSORY/HEATER BLOWER 1 ORANGE (+) @ IGNITION SWITCH HARNESS ACCESSORY/HEATER BLOWER 2 N/A KEYSENSE LIGHT GREEN (-) @ IGNITION SWITCH HARNESS PARKING LIGHTS ( - ) WHITE (-) @ BCM, LIGHT BLUE plug, Pin A5, See NOTE #4 PARKING LIGHTS ( + ) BROWN (+) @ BCM, LIGHT BLUE Plug, Pin B6, See NOTE #4 POWER LOCK LIGHT BLUE (TYPE A) @ BCM, BROWN plug, Pin A4, See NOTE #4 POWER UNLOCK WHITE (TYPE A) @ BCM, BROWN Plug, Pin A3, See NOTE #4 DOOR TRIGGER See NOTE #2 @ BCM, See NOTE #4 DOMELIGHT SUPERVISION TAN (-) @ BCM, PURPLE Plug, Pin B4, See NOTE #4 TRUNK RELEASE N/A SLIDING POWER DOOR N/A HORN BLACK (-) @ STEERING COLUMN HARNESS TACH WHITE (AC) @ ECM, See NOTE *2 WAIT TO START LIGHT DARK BLUE (-), See NOTE #5 @ INSTRUMENT CLUSTER BRAKE WHITE (+) @ SWITCH ABOVE BRAKE PEDAL FACTORY ALARM DISARM LIGHT GREEN (-) @ BCM, PURPLE plug, Pin B3, See NOTE #4 ANTI-THEFT YELLOW (+), ORANGE/BLACK (-) and RED/WHITE (Not used) GM's PASSLOCK 2 System, these wires exit the Ignition Switch Tumbler together and are in the Main Ignition Switch Harness in the Column. EXTRA INFORMATION NOTE #1: This vehicle is equipped with the PASSLOCK 2 ANTI-THEFT SYSTEM and will require a 791 Bypass Module for Remote Starting, to order go to the SECURITY BYPASS MODULE Page on this website. NOTE #2: This vehicle has 2 door trigger wires, the DRIVERS DOOR is a TAN (-) PURPLE plug, B4 and ALL OTHER doors BLUE/WHITE (-) LIGHT BLUE plug, Pin B11 at the BCM use both Door Trigger wires and DIODE ISOLATE when connecting to an ALARM SYSTEM, to connect, See DIAGRAM. NOTE #3; The ECM (Engine Control Module) is located near the battery, down low, between the fender and the fan, under a BLACK plastic cover. On the 4.3L engine it is in a 20 pin connector labled RED. On the 4.8L, 5.3L and 6.0L engines it is located at Pin 10 in the RED connector NOTE #4: The BCM (Body Control Module) is located behind the drivers side of dash, with the plugs facing the rear of the vehicle. NOTE #5: when hooking up a remote starter, if you cannot get the (+) or (-) Wait to Start wire on the Remote Starter to work properly, you will then need to disconnect this wire and Program the Remote Starter for the 5, 10, 15 or 20 Second Wait to Start Timmer in the Installation manual. NOTE #6: IMPORTANT !!!!! this wire MUST BE CONNECTED as IGNITION #2 for REMOTE STARTING!!!!!!