Article: Cleaning the Throttle Body

[Zman]

I'm a hand at 1st gen toy4x4 trucks having restoed 7 but total newby to the space van. Got a 4x4 5 manual and have a high idle problem. Could this be a bad dash pot and how can I either find one to buy or test the one I've got? Also, you mention just getting rid of it. What's the down side on that?

I love this forum. It's brought me face to face with feedback circuits and cpu unlike any of my 1st gen truck projects. Thanks for your enthusiastic contributions. I definitely am stoked for the help. Zman Kona PS Merry Christmas!

[timsrv]

Hi Zman and welcome to TVT! I talked about this a little on post #3 of this thread. IMO there's very little downside (if any) to removing the dash pot. I never really understood why it was necessary in the 1st place, but was told it was to somehow reduce emissions. I can't imagine it making a big difference, but who knows. If yours is good, then leave it, but if it's sticking and causing the idle to be erratic, then that's a drive-ability issue. To me, a drive-ability issue trumps an emission issues (at least one this minuscule). If you're not sure if it's bad, then remove it and see if the problem goes away. If it doesn't then put it back on. Tim

[originalkwyjibo]

The purpose of the dashpot is to keep the throttle from snapping shut when you shove in the clutch and suddenly back off the throttle. When the throttle is suddenly released and the engine de-cels rapidly, unburned fuel is dumped out the exhaust. By slowing the speed at which the throttle closes it mixes more air with the fuel and gives it a chance to burn more completely. It's not necessary on an automatic because the torque converter has the same effect. But ya, if it ain't working right, ditch it.

[whatvan]

Are coolant hoses 16267-73010 and 16264-73021 still available? I’m striking out with those.

[JPERL]

Are coolant hoses 16267-73010 and 16264-73021 still available? I’m striking out with those.

no longer available I just confirmed

[whatvan]

link to McMaster-Carr M3.5 X 0.6 screws. Sold in qty of 100.

https://www.mcmaster.com/screws/system-of-measurement~inch/thread-size~m3-5/length~16millimeters/

[whatvan]

i have a spare throttle body i was cleaning up as practice for cleaning the TB currently attached to my van.

While disassembling this TB, the plastic spacer for the springs (Circled in red) disintegrated.

when i get to the point in picture 2, will all that come off as one, or will the springs need to be unattached first? I attempted to disengage the springs from the piece that hits the throttle stop screw and thats when things fell apart.

is this piece replaceable (part number?)? Or, if this happens round 2 am i screwed? Anybody with a TB thats NFG got a spacer to donate/sell?

other than that, everything went swimmingly and metal parts are currently soaking in chem dip.

[iq_artwork]

Hello everyone and Happy 4th!!

I got this TB from an automatic '86 van. I cleaned it and built a gasket. For the gasket is this what I need or do I need to make the other caps i have marked with red here?
My van is '84 manual, is it the same TB for auto and manual vans?

Thank you!

[JDM VANMAN]

Take a look at the 1st and 3rd posting on page 1 of this thread-

1st posting- auto TB
3rd posting - manual TB with Dashpot

If I’m understating correctly the 5 speed vans have a dashpot on the TB, I’m not sure if that means they are not interchangeable.

Whats the part number on your TB?

JDM

[Diy2k]

Guess who has high P/N idle after rebuild!

*me*

[iq_artwork]

JDM thank you very much for your quick reply.
I think I'm not going to risk it, I will stay with my TB I have in my van now. I just have to take it and clean it. I though it will be faster for me to have an extra TB and work on it while I can drive the van too.

The number of the TB I took from the junk yard is 730 32.

Do you think the gasket is right?

[JDM VANMAN]

I know the gasket is impossible to find (NLA) and some members have either made a gasket or used a gasket maker, sorry I don’t remember what it’s called. There’s a couple of different TB part numbers imprinted on various years TB’s, looks like the one Tim is rebuilding looks like 730-39. I’ve sold a couple of them but can find the posts, I think they were cleaned up during forum house keeping as old closed posts.

JDM

[timsrv]

Although the TB gasket (Toyota part #22271-73011) is NLA through Toyota, these will occasionally come up on eBay and other sites as NOS "New Old Stock" (I just checked eBay but nothing is currently available). Compete Aftermarket gasket sets are still available and some will include this gasket: https://www.ebay.com/sch/i.html?_fro...asket&_sacat=0 https://www.ebay.com/sch/i.html?_fro...Desc=0&_sop=15. If you need to make one, Here's a picture of what it should look like and how the holes line up:

[Diy2k]

Can’t see the image

[iq_artwork]

Tim thank you very much!! What's the best material for that?

I have seen youtube tutorial using this material:
https://www.amazon.com/Mr-Gasket-77-...3994873&sr=8-3

and some auto shops selling these ones: (Tank fiber material)

[timsrv]

Can’t see the image

I posted 2 images........anybody else having trouble viewing?

Tim thank you very much!! What's the best material for that?

I'd probably avoid using cork here. Either one of the other 2 shown in your pics should work fine. I can't read the tan stuff, but can see the gray calls out gasoline, so unless the tan stuff says that too, I'd go with the gray. Tim

[iq_artwork]

Tim thanks again!!

[iq_artwork]

Hello everyone,
Today I tried to adjust my sensor on my TB. I bought a new Beck/Arbley #8945214020 from RockAuto.

Here's a video of my process, is this right?
https://www.youtube.com/watch?v=BJLJ5EfYvAQ

[Jdelgado]

Video is private, Can you change to public view?

[timsrv]

Video is private, Can you change to public view?

X2