Out of boredom today, I took my throttle body off and cleaned it. It was full of crap and the plate was actually sticking a little too I noticed. It is now clean and shiney.
Apparently it was nastier than it looked because it feels like i have a new engine now. It idles better. And the throttle responds faster and smoother. The cruise control accelerates much smoother. And it seems to coast downhill much better than it did before (and I do a lot of that to be cheap on gas).
We'll see if it makes a mileage difference on the scan gauge soon. But overall, I highly recommend everyone do this. That 100,000 miles worth of crap really messes with it apparently.
I don't even know what possessed me to even look. I was bored. Simply pulling the tube off and hosing it down from the outside is not adequate and forces the crap and cleaner deeper into the intake. You are only half-ass cleaning half of the throttle body doing that and your wasting your time. However the IAC
is good thing to clean too. I already did that a few months ago so I didn't bother yesterday. Matt's guide to cleaning the throttle body in 10 easy steps:
(1) Loosen hose clamp where the intake hose meets the throttle body. Unplug the MAF
electrical connector and the crank case vent from the intake hose.
(2) Pull the intake hose off the throttle body and unlatch it from the air cleaner box. Put it off to the side out of the way. Look in the throttle body, you will see it caked full of black dirt and oily residue. Its nasty, don't wear nice clothing.
(3) Unplug the wire from the throttle position sensor on the side of the throttle body. Loosen and remove the two philips head screws holding it on. Place it aside.
(4) The throttle cable is pretty obvious on how to unhook it from the throttle body. Lift and slide off to the side like a bicycle brake caliper. If you have cruise control, you just pull back on the connection and it will snap off (yes, it snaps back on too). Disconnect both of them.
(5) The throttle body is held onto the intake manifold with (4) 5/16" bolts. Loosen, remove and don't lose the bolts. The throttle body will come off in your hands. Don't drop it.
(6) Now that you have it off the truck it is time to clean it. The most logical cleaning solution is throttle body cleaner (duh). I didn't have any so I just used an ether based spray can of starter fluid. Do not smoke, toke, grind metal, or launch fireworks while using any of these cleaners.
(7) Spray it in and let it soak, dump it out. Do the same on the other side. Spray some more and work the throttle plate open and closed. Spray some more and use some paper towels or shop rags to wipe it out. You'll probably need to do a lot of spraying and wiping.
(8) The tricky part is cleaning the throttle plate. You have to hold it open. With the throttle plate held open, clean the plate, the edges of the plate, and the throttle body around where the plate closes. It can be really caked full of crap around there since it is choke point for the air flow. It is pain in the ass to do while holding it open. Wedge it on something or have someone hold it for you.
(9) Spray some more around the exterior linkage and clean that up nice.
(10) Make sure the whole thing is clean, dry and free of loose crap, bits of towel, torn skin, or dried blood.
Work backwards from step (5) to reassemble. Make sure you plug all the stuff back in and reattach that crankcase vent. Start the engine. If it will not start, runs like crap, or throws a rod through the hood, then you obviously can't follow simple directions and ya done f*$ked up. I take no responsibility, award you no points, and may god have mercy on your soul.