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2000 Chevy Silverado 1500 being stupid at take off.


bradterry

Question

Fixed knock sensors but the truck is still having problems. When you mash the gas past about halfway it just doesn't want to go but as soon as you back off it takes off. Or if you just mash it normally it does just fine, and if I'm already going road speed it does fine even if I floor it.

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Check for plugged exhaust/broken catalytic convertor. Generally whenever I have run into a vehicle that accelerates faster if I lift a bit off the pedal, it was a bad convertor that had the honeycomb all broken up inside and it would rattle around until the exhaust flow managed to move them and they blocked the outlet. In some cases, that broken up material made it out of the convertor and found its way into the muffler, where it again, can move around, eventually blocking the exhaust flow.

 

Also check fuel filter, and if you do not recall when it was last changed, change it. I have a buddy that showed up at my house one day with his 1990 GMC with the 305. He thought the transmission was on its way out, and asked me to take it for a drive. At that time I had never experienced a plugged fuel filter on a fuel injected vehicle. On this truck, if you went past half way down on accelerator, the truck would simply refuse to accelerate unless I lifted slightly on the gas pedal. It would also downshift, then upshift, then downshift again while it was trying to accelerate. To me, my first thought was plugged exhaust. I suggested he take a look at getting the exhaust dropped to test this. He called me a couple of days later saying it was the fuel filter doing it. The filter was original, and had just over 350,000km on it. It was so badly plugged that you could take the filter, pour gas into the inlet side of filter and hold it with outlet pointing down, no fuel would leak out. The pump could produce enough flow to get the engine to run, but not enough flow to feed under loads. BTW, the truck passed the fuel pressure tests. I asked him if they also changed out the pump, he said they didn't but they said it passed pressure and flow tests. I told him to change the pump anyways, since the pump had been running under a very high load and would likely fail soon as well. He decided to wait for it to fail. He didn't have to wait long, pump failed a month later, luckily in his driveway.

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