![]() My truck blows some black smoke occasionally on start-up as if an injector is going bad and leaking into the cylinder. What gears should be in it stock and what ratio could be installed to theoretically put it back to stock with the 31's? I like the look of the 31's but it know that they make it weaker. It's always been weak since I bought it with 114,000 and the 31's were already on it. ![]() I also wonder how much effect the 31/10.50's have on it's power with stock gearing. My truck has 165,000 on it and is a 2.7L with an auto. What would cause this? Could the converter be partially plugged or even the muffler causing too much back pressure? If so how can I check the back pressure? The CEL recently came on and the P0402 code comes up on the code scanner. My '99 PreRunner has been weak for a long time and the gas mileage has always sucked.
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