Compression Ignition Addict
Join Date: Jun 2010
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The bigger culprits of a tired truck
Lately I've noticed what a lot of others have noticed in their trucks-- the old girl just seems a hell of a lot more tired than she used to.
Over the last few months, I've noticed that my truck still takes off the line seemingly OK, but its ability to keep speed on hills without downshifting is gone. I used to be able to just give her a little more pedal and hear the turbo whistle a bit more and she would just take off. Towing has also become a chore. I used to be able to put an 8000 lb load behind me, and while I could definitely feel it back there I never had much trouble with it. A couple weeks ago I put a 5800 lb chevy 1500 conversion van on my 1800 lb empty dual axle tow-behind flatbed, and when I hit that steep 3/4 mile grade on the highway, halfway up I was in third gear with my foot buried into the floor to stay above 1700 RPM or risk it bleeding down. My friend whose mom's car I was towing was behind me, and he said the heat plume dumping out of my exhaust was impressive, and he could see the puff each time I shifted. My fuel economy has also declined. I'm getting about 220 miles per tank, where I'm used to 240-250 when I'm not towing. The truck just feels like it has an exhaust blockage, plugged fuel filter, and filthy air filter, all at once. I've addressed the filters this past week... just a bit of change, but not much.
I've yet to do a fuel pressure test, that's on my list of things to check today. The truck is at 164K, and it starts with the white puff of smoke followed by a couple minutes of light bluish until it gets hot. The exhaust back pressure valve seems to be working OK, as I can hear it flip open once she's warm, and I also hear it cycle on cold days on the highway. I recently buzz-tested the injectors, and they all sounded good.
If it was your rig, where would you start looking?