View Full Version : Vacuum sensor on firewall.....

06-07-2005, 11:40 PM
So my car idled kind of rough (idle bouncing from 900rpm to 1200rpm) and I unplugged the vacuum line going to the vacuum assembly sensor on the firewall above the intake manifold. (It's mounted on the strut bar). After I disconnected the vac. line, it quit and idles just fine. What can be the cause of this? I know they put that sensor there for a reason, so I'd like to replace it. Thanks All

91 GTS w/ 5sfe

06-08-2005, 02:31 AM
Yeah sounds like your sensor is bad and its poorly regulating your fuel mixture. I had the same symptoms on my 91 5s-fe. A little t/s and swapping the vac sensor with anothe off a Toyota Corrolla fixed the issue with the idle. I used the Corollas vac sensor till acquired one at the junk yard. If there is no proper signal from the sensor then the ECU will revert to compensating for the loss and I think it makes your mixture richer. Hope this helps.

06-08-2005, 03:49 AM
A properly working sensor will make your car stall when you remove that pipe...at least that's what mine does