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Tvis cleaning/function

Posted: Fri Mar 08, 2019 8:10 am
by Franken_Hachi
I have a stock 1985 Corolla gt-s and below 4500 rpm the engine is not reving like it used to before being in storage. I know the tvis opens the butterflies @ 4200 +/-.
The link for tvis in faq isn't working, so does any one have any advice on cleaning, repair, and testing?

Re: Tvis cleaning/function

Posted: Fri Mar 08, 2019 9:46 am
by totta crolla
To test you can unplug the wiring connector from the TVIS this should keep the TVIS plates fully open all of the time.

Re: Tvis cleaning/function

Posted: Tue Mar 12, 2019 6:02 am
by Franken_Hachi
Yup, it acts exactly the same with it unplugged. I need to pull it and test the diaphragm.

Re: Tvis cleaning/function

Posted: Wed Mar 13, 2019 5:20 am
Get some Seafoam (or Motul if you're a baller) and draw it through the throttle body. If your TVIS butterflies are sticking, this should help free them up without having to take anything apart.

Also, Jondee had some good advice about checking the vacuum lines. Check your water pump post.