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961 Posts
Discussion Starter #1 (Edited)
I took apart my throttle body to clean the IACV in hopes that it would sort out an issue where my idle dropped too low. I think I made a mistake because when I put everything back together the idle is much worse.

  • When I start the car, it revs up normally to nearly 2k rpm, but then dips down almost to 0 (nearly stalls), then bounces back up a bit
  • If I give it gas it has the same issue (dips down to almost 0 / nearly stalls after I let off the gas)
  • The car sounds raspier in the intake than usual
  • Things smell a little off while it is running (though sort of hard to tell if that is new or not)
Possible Issues:

When I did the install I think I did a few things that may have caused issues:
  • Drained about 12oz of coolant by mistake / might have introduced air pockets
  • I read afterwards there is a graphite seal you are not supposed to clean off, which I may have cleaned off because I was cleaning TB aggressively.
  • My TB / IACV are also just very old (20 years) and the IACV seemed to get stuck even after cleaning. Wondering if I might just need to replace them.
What should I do to try to fix this?

I was torn between:
  • Trying to bleed and replace coolant in case I caused an air pocket
  • Buying a replacement TB and IACV from a donor (or new) and just replacing them outright, or maybe just a new IACV
  • Taking it to a mechanic and admitting defeat.
Any ideas on what’s the most likely issue or how to fix are appreciated. Also curious if safe to try to drive it in this state.



961 Posts
Discussion Starter #3 (Edited)
After re starting the car a few times this issue keeps getting progessively better. I am actually wondering if I just shocked the car by cleaning things out after they'd been gunked up for so long (there was 20 years of grime in both TB and IACV).

Learned a lot along the way. None of the youtube videos / tutorials mentioned these things so adding in case they help anyone:
  • If you do this, you definitely want to order replacements for the TB gasket and IACV gasket - service manual says that you should replace both when you service these parts. And can confirm they are pretty beat up if you haven't serviced them in a while (see pics above)
  • Big bolts on TB have a torque spec - 22n/m, make sure to tighten accordingly
  • Hoses for coolant also get seized on, I used a sharp pick-like tool and a tiny flathead screwdriver to pry around the seal and loosen them up, as well as pliers to twist it a bit and break the seal. Once I did all that they came off easily.
  • Make sure to remove coolant cables in the right order, I think this is generally "low to high", someone who knows more can confirm.
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