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Showing results for tags '2000 gmc sierra'.
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Hello, I have a 2000 GMC Sierra 1500 5.3Liter with 246,000 miles. I have a code P0306 for misfire Cylinder #6. I have changed the spark plugs and wires. Then did a compression test and cylinder #6 had low compression at 120psi. All other cylinders had between 180-190psi. Did a leak down test and heard air flowing through the oil filler spout when #6 was at TDC on the compression stroke. Removed the head, valves looked good. When I cranked the engine by hand, the piston for cylinder 6 would not go up all the way to be flush with the top of the cylinder like the other pistons were, it would come up to 1/8” before the top, the go back down. What causes this and how can I fix it? Do I have to replace the piston? Or?? Thank you for taking the time to read this, any input would be greatly appreciated. -
Hi, I have a 2000 GMC Sierra with a 5.3L. Last year the temperature gauge on the truck started to read a high temperature, I changed the thermostat and topped up coolant and never had the problem again. Until recently, the gauge started to read high again (not overheating though). I'm finding that at low speeds (40km/h and below) the temperature reads normal. As I got higher (up to 90km/h) the temperature starts to raise from 95-115. then cools right down when I come to a complete stop. Now the weird part of it is that whn I go on the highway the temperature will rise as i accelerate onto the highway, then after a couple minutes over 100km/h, the temperature falls right back down to normal. Then when I come off the highway, slowing down to anything under 80km/h the temperature rises again. Why could this be? Thermostat? Waterpump? Coolant? Cursed? I'm lost..
