Signs Of A Bad Plenum?
What are some common signs of this problem? I noticed my MPG during this winter have dropped from 13/14 in the summer to around 10/11 for the winter, but i'm going off of the information on the display on the head unit, I haven't actually done it any other way to test my real MPG.
The truck does have 230k miles on it, but doesn't seem to lose oil, as from the time we got it in Aug to changing it in Feb it was low by about a quart, but the oil in it was pitch black, so I assume it just maybe broke down (hopefully). No clue when the oil was previously changed.
Under the hood is really clean for 14 years old, and from the looks of all the fluids under the hood except the engine oil, all of them have been changed recently, as they still hold their color, and what not.
The transmission has been rebuilt, and I am more than certain the previous owner took care of the truck. Or so it seems lol, I am just worried with the low MPG during this cold winter, the quart loss over 6 months and about 2-3k miles, that it may be a sign of a bad plenum.
Another thing i read that could be a sign of a bad plenum is a ping from the engine, I don't know exactly what this is, but when driving everything sounds fine, but if I heavily accelerate, like a sudden quick MPH gain from like 40-55 by pushing the gas pedal heavily, I hear pinging/ticking from the engine it sounds more like the lifters are rapid clicking.
This is only while heavily accelerating tho, normal acceleration I do not get the sound.