Mechanics

VIBRATION WHILE THE CAR IS IDLE

1995 Toyota Corolla • 1.8L 4 cylinder Automatic • 168,000 miles

My car is vibrating a lot while on idle. I spoke to a friend of mine which had the same problem and told me that most probably is the IAC. I'm not sure about this, and further more, I don't think I have this part on my engine. Behind the end of the manifold, there are 2 small hoses which are connected to nothing and I believe the IAC was supposed to be there. I'm not sure though. Can you please help me with this issue? Thanks
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Franco8406
January 27, 2014.




The IAC would be mounted to the throttle body. IF you have two vacuum hoses not attached to anything, that would create a leak and cause a rough idle.

Those 2 hoses are the ones on the picture I posted. Will try to find what was there originally and see if the problem will be solved. Would you happen to know what is that part missing for my 7A-FE engine?

Tiny
Franco8406
Jan 27, 2014.
I can't be sure from the pic. Try this. Take a bolt and plug both of the hoses to see if that changes your idle.

I have not been able to try it yet since I was at the repair store. It seems that I'm missing a Vacuum switching valve there, I'm just missing the right code for my vehicle

Tiny
Franco8406
Jan 27, 2014.
Problem solved! It was indeed the Valve. I got replacement p/n 90910-13004 and so far it has made the car to idle nicely. I still have my check engine light on so I will diagnose to see what's next. Thanks for your help!
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Tiny
Franco8406
Jan 30, 2014.

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