Question about 1998 Chevrolet C1500

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I have a 1998 Chevy pickup truck with a 5.7L 2WD, it runs perfect, and doesnt burn oil, but it has black soot coming out of the exhaust pipe Was wondering if I should still change the spark plugs, wires and put in a new air filter

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Wouldnt hurt to do a tune up but i would think its probably going to be the air pump.

Posted on Sep 04, 2010

  • jus_55pu Sep 05, 2010

    what is a air pump? never heard of it. I am in the automotive technician program at a college and we have never heard of a air pump

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OK my 95 Chevy 1500 2wd 4.3 manual transmission, seems to have a little loss of power it smokes a little out the tail pipe and every time I give it a lot of gas the oil pressure goes down will bottom out...


Yes, it could be connected. If you run an engine with straight pipes, there will be no back pressure from the exhaust system, and the gas flows very fast out of the engine past the exhaust valves. This will cause the valves to heat up more than the manufacturer's spec and could burn the valves.
This in turn will cause loss of power. Overheated valves will cause the valve stem seals to harden and even to disintegrate, causing slight smoking from the tailpipe.
The oil pressure is a sticky toffee. If you have enough oil in the engine, you should have equal pressure at either low or high speed, unless you have a dicey oil pump, or oil level is low, causing the pump to lower the level in the sump or cavitating (sucking in air with the oil).

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