Throttle body cleaning

[lonestarjeff]

Spending all my spare time lately chasing a problem on my F150 has me feeling the Expy is being neglected, plus it's been idling pretty rough for several months. Then, I couldn't recall ever cleaning the Expy's throttle body.

I had just completed the same job on the F150, so it went pretty quick. Here's what the Expy's TB looked like when I pulled it off....

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It was rather shameful to let it get that nasty. The truck has 156k miles on it, I bought it with 11k on it, so the TB has probably never been serviced. I went ahead & pulled the intake horn off too, the EGR ports were completely plugged with a black tar thing growing into the throat. Had to drill both ports out.

Idles much better now.

 

[1955moose]

Looks like a Louisiana swamp! Yikes. You can spray out the intake once a year. Do it on your birthday. That would be your present, a better running truck. As far as the Egr, a coat hanger and carb clean is what I used.you have the pull it unfortunately. How's it running now?

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[lonestarjeff]

Running like a champ. The only symptom I had was rough idle before a cleaned it, but I wonder if mileage on highway will improve a bit now that the EGR ports can actually pass some exhaust back into the manifold.

 

[Adieu]

Pretty damn clean, you ain't seen nothing yet till you went at a biturbo diesel throttle body

 

[Machete]

And to think of all the “additives “ the gasoline brands tout! Makes the case that theoall full of it.

 

[1955moose]

Like scrubbing your kitchen floor with a brush and ammonia, nothing works like good old elbow grease!

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[lonestarjeff]

Here is shot of the EGR ports before I cleaned it up....

 

[lonestarjeff]

....you ain't seen nothing yet till you went at a biturbo diesel throttle body

The only thing diesel I have is an old tractor & it is truly filthy around all fuel-related parts. Can't imagine a turbo version.

 

[and0r]

REPLACE POSITION SENSOR. BE READY FOR PHILLIPS HEAD TORQED AT OVER 100LBS MAY NEED TO CUT A NEW FLAT HEAD SLOT INTO THE SCREW AND USE LARGEST DRIVER YOU CAN FIND

 

[Adieu]

The only thing diesel I have is an old tractor & it is truly filthy around all fuel-related parts. Can't imagine a turbo version.

Looks like coal, sticks like epoxy... if there's JUST an inch-thick chunk hanging off your throttle body, you're in good shape.

Some guys post pics with like 75-90% filled up throttles

 

[lonestarjeff]

I drove the truck to our farm this weekend(about 200 mi round trip)with no problems, but I noticed today driving around town it has a missfire every few seconds sitting at traffic lights. I say missfire, but no service engine light so far.

 

[1955moose]

Spray a little carb clean around the gaskets you changed. Egr, and throttle body. You might have left a little old gasket on one of them. I like using a window sticker razor blade tool for a gasket scraper. After I hit the whole area with some #120 grit Emery cloth, till the surfaces are smooth as a baby's butt.

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