20 Most Recent 2004 Buick Rainier - Page 7 Questions & Answers

Read your owners manual and familiarize youself with the information of how driver alerts are sounded, and also shown on the instrument panel. Follow the recommended interventions.

there is an actuator in the front axle that engages the drive shaft to the wheels. there is also a vacuum actuator i believe in that model it is under the battery plate. if you put on lift you can trace the cable from the front axle back to the actuator and check the cable, actuator and vacuum lines. Gm's system is complex and when is messes up its a night mare. but common failures are actuator cracked or broken vacuum line.

Exactly what the code entitles, the air injection valves that shoot air in the exhaust to help burn excess gasses when the engine warms up the engine when it's cold are malfunctionning. When the engine is cold is just started, it uses what we call a open loop, the engine runs fuel maps and such with a stored program in the ECU that doesnt take in account all the sensors to allow a smooth start and warmup, then after it's warm enough and all, it goes to closed loop using all sensors to lessen the pollution. So when in closed loop, the ECU uses the oxygen sensors to adjust air/fuel ratio, but seeing as how the air injection is possibly jammed open or malfunctionning in some other way and sending air in the exhaust, the sensor think the engine is running lean and injects extra fuel to compensate, but since the reading is false, the engine is actually running rich and making you lose power. Try bypassing the air injection if you want to test this, just find the hose in the exhaust manifold that goes to some black plastic canister type thing and unplug the hose from the canister and find a way to jam it shut so no air can get in. If you sealed it good you should now have full power when the engine has run a while. Hope this helps!

There are 2 types of AWD full time and part time.In AWD there is difference in speed from front to rear These system are not selectable and do not have low range. There is also on demand AWD.This is a 30% to front and 70% to rear. To truly diagnosis your concern is with a comparision vehicle.

try clean your throttle body at the butterfly with throttle cleaner .dirt on the sensors.

make sure the shifter is in park.

If it is just burnt out , you do not have to remove or replace the whole lamp , just the small bulb inside of it. They are usually easily accessable from inside the engine compartment , and just come out of the back of the headlight by 1/4 turn.