Where is this hose supposed to lead to?

suprajim · 11-01-2009, 12:43 AM

Ok, so I found the hose that is supposed to be hooked up to the BPV. It had a bolt in the end of it capping it off. I removed the bolt and hooked it up to the BPV. I started the car and everything seemed fine. As the car warmed up and the RPM's dropped to normal idle, it is idling really rough and erratic. It sounds like it wants to die, but never actually does. I give it a little gas and it's fine, but as soon as I let off and let it idle, it becomes rough again. I know a vacuum leak can make it idle rough, but don't hear any hissing anywhere to indicate a leak. I don't understand why it would run better without it hooked up to the BPV. Anyone have any ideas?

cre · 11-01-2009, 05:39 PM

Check all the usual suspects, vacuum leaks (use an aid to be sure you're not missing one: propane, brake cleaner...), timing, verify ALL of the vacuum routing, test the BPV to see it the diaphragm isn't split and creating a leak there.

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11-01-2009, 12:43 AM	#1
suprajim Intake Join Date: Jul 2009 Location: Dallas, TX Posts: 36	Ok, so I found the hose that is supposed to be hooked up to the BPV. It had a bolt in the end of it capping it off. I removed the bolt and hooked it up to the BPV. I started the car and everything seemed fine. As the car warmed up and the RPM's dropped to normal idle, it is idling really rough and erratic. It sounds like it wants to die, but never actually does. I give it a little gas and it's fine, but as soon as I let off and let it idle, it becomes rough again. I know a vacuum leak can make it idle rough, but don't hear any hissing anywhere to indicate a leak. I don't understand why it would run better without it hooked up to the BPV. Anyone have any ideas?

11-01-2009, 05:39 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Check all the usual suspects, vacuum leaks (use an aid to be sure you're not missing one: propane, brake cleaner...), timing, verify ALL of the vacuum routing, test the BPV to see it the diaphragm isn't split and creating a leak there.