2000 Chevy Suburban V8 Four Wheel Drive Automatic 130000 miles
Hi, I have read so many threads concerning this Service Engine Soon Light and am still stumped as to what the solution is. After scanning the vehicle I find these codes:
P0171 System Too Lean (Bank 1)
P0174 System Too Lean (Bank 2)
At last service, fuel filter, fuel pump, air filter, pcv valve and battery were changed. Transmission was also flushed. Belts were inspected as good. This was all done 3 months prior to light coming on. I dont know whether this is related but temperature dropped to -4F/-20C. Unfortunately I wasnt prepared and had a cold start which caused the engine to crank slowly before finally starting. Drove to gas station filled up and 2 minutes driving away, the light came on. Its been 2 weeks and I have tried tightening the gas cap, changing the location where I fuel and switched from using 87 to 91. I now also park in a heated garage. Light comes on stays on a few days, clears itself for another day a so and then comes back on. On cold days, light definitely stays on and I also hear a low whistling sound when accelerating. After lifting foot off accelerator sound goes away but when I step on the gas again, the whistling sound comes back. Also on cold days, when starting engine, noise comes from belt area. Noise disappears after driving for a while. I have been told by the parts stores to change 02 sensors. Whats the problem? My Service Engine Soon light needs to go! I appreciate your assistance!
have the same problem?
Wednesday, January 7th, 2009 AT 12:32 PM