Chevrolet Tahoe and GMC Yukon Truck Answers

Just bought a 01 Tahoe seemed to run quiet at first then after a while when u first start it it almost sounded like a diesel. Now a couple weeks later when you first start it there seems to be sort of a knock until u put it in gear and drive it a very short distance.

1996 GMC Yukon SLT 4WD 5.7 L Vortec. Question: After I stopped the vehicle,the vehicle would not move in any gear.The 2 wheel drive,4 high,and 4 low buttons would not light up when touched. When I put it in park it makes a grinding noise.What could this be?

2000 GMC Yukon. 5.3L Vortec. Question: My Yukon quit going down the road and now it spits and sputters when u start it and cant give it and acceleration.

2004 GMC Yukon  SLT.Warning lights: ABS Codes CO265 and CO298. Brought it to my mechanic and got a computer scan read out.

1997 Chevrolet Tahoe. Engine Size : 5.7L Vortec. Question: Driving along vehicle started misfiring when the steering wheel was tuned to the right. after a few miles shut down and had to be towed. There is no spark and and fuel pump does not run. changed fuel pump relay, crank sensor, cam sensor and distributor module.

2002 GMC Yukon XL 2500. Engine size = 8.1 Replaced crank & cam sensors. Question: Starter will not spin or engage. When I turn key to run position all normal dash lights illuminate, fuel pump runs 15 sec. or so. Continue to turn key to start dash lights go out, but no crank.

2010 GMC Denali Truck. Question: My truck has heated seats and i was wondering if you can program them to come on when starting the vehicle with the remote start. Living in Northern Canada it would be nice to get in a warm truck without cold seats.

2003 GMC Yukon XL. Question: Car was dying. Water added to battery. Battery overflowed. Now, after I hit a bumps in the road: Door locks "cycle", "Ding" sounds for about 10 dings or just a single "ding"ABS light, brake light, and "service brake system" light all go on,A/C turns off but resumes again after 2-10 minutes Car loses power & "reduced engine power" message comes on.

I have a 1997 Tahoe 4wd W/automatic transmission. I have just had a problem I hope someone can help me out with. After driving at highway speeds 65-70 for about 25 miles as I slowed then stopped the ABS warning light came on and it seemed like the transmission was disengaged or slipping. I put in neutral then back into drive, nothing. I slipped it down into 3rd, nothing.

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How Things Work

Positive Crankcase Ventilation - PCV Valve System

A crankcase ventilation system is used to consume crankcase vapors in the combustion process instead of venting them to atmosphere. Fresh air from the throttle body is supplied to the crankcase, mixed with blow by gases and then passed through a PCV valve into the intake manifold.

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Common Engine Codes

Knock Sensor Codes P0325 and P0327

The powertrain control module (PCM) contains integrated knock sensor (KS) diagnostic circuitry. The KS produces an AC voltage at all engine speeds and loads. The PCM then adjusts spark timing based on the amplitude and frequency of the KS signal.

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