Throttle Body Question

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Jun 15, 2006 | 10:59 AM

brae123

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Throttle Body Question

I have a 2000 EB with the 5.4. My gas pedal was sticking in the closed position very slightly. It would take a tap on the gas pedal to get it unstuck and then would operate fine.

I removed the throttle body and found that it was covered on the back side with a black residue and carbon. I assume that it was fuel. The plenum behind the throttle body was wet and black also.

I cleaned up the throttle body and cleaned up as much of the residue inside the plenum that I could get to.

This corrected the sticky throttle. What is this black carbon caused by since the fuel is mixed farther down line? Is this normal?

I don't mind cleaning the TB, about 15 mins to remove and clean. Is this something I should do with routine maintenace?

Jun 15, 2006 | 08:41 PM

pitrow

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From: Cornelius, Oregon

it's a normal thing for these. I can't really tell you for sure what the junk is made of, but I can guess that with the recirculation of crank case gases and such it's probably oil of some sort.

Jun 15, 2006 | 09:45 PM

Big Craig

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From: Columbia, SC

Actually it is un-burnt fuel that right after shutdown vaporizes back up an open intake valve and winds up coking onto the cold intake passageways.
Absolutely normal and is usually taken care of during fuel injector cleaning in a 3 part cleansing

Nov 5, 2006 | 08:35 AM

DRocky

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There is no reference to cleaning the throttle body in the manual. How is this done on a 2000 Exp?

Nov 5, 2006 | 10:23 AM

brae123

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Very easy process. Remove the air-intake from the air cleaner to the throttle body. Dissconnect the throttle cable. It just pops out of the attachment. Remove the four bolts that hold the throttle body on. Spary the TB with throttle body cleaner and wipe down. Replace in the reverse order. While you have everything apart, it is a good time to clean the mass airflow sensor also. You can find that cleaner along side the TB clean at the auto parts store.

After I purchased the Expy I did these two things and it helped my MPG by about 1 - 2 MPG.

Nov 6, 2006 | 12:13 PM

pitrow

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From: Cornelius, Oregon

Actually it's even easier than that, at least on my '99 it was. I just removed the cover over the TB (4 bolts) then loosened and removed the air intake hose from the TB. Using a rag and some sensor safe carb cleaner I just scrubbed the inside of the TB until it was clean. Make sure you open the throttle plate and scrub the little ridge that it rests against when closed and that you get the back side of the throttle plate too. Then just put the air-intake back on, put the cover back on and you're good.

Nov 9, 2006 | 08:01 AM

DRocky

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Thanks! I thought it must be pretty easy, but I wanted to make sure i wasn't missing something. I've been getting a "service engine soon" light. The code indicated "insufficient air flow in the EGR". I replaced the EGR valve and that didn't work. I also replaced the DPFE sensor, which turned the light off for about 35 miles. I checked the EGR Vacuum sensor, and it appears ok. That pretty much leaves the TB unless you know of something else.