1994 4Runner wont stay running
08-08-2010, 05:21 PM
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1994 4Runner wont stay running
I have a 1994 Toyota 4Runner V6 3.0L, I have just changed out the EGR Modulator (which was broke), the BVSV behind the air intake(which was also broke), put in a new PCV Valve and new Valve Cover Gaskets because they were leaking. I also changed out most of the vacuum hoses since a lot of them were cracked or broke (i put all the vacuum hoses back in the right order from the vacuum diagram).
Prior to me doing this it ran okay and didn't really have anything major wrong with it except the idle was a little low (only about 500rpm) and when you drove it for a while and stopped it would jump idle for about 200-500rpms for a few secs and clear back up to 500rpms.
After I replaced the parts and put everything back together I noticed I had two vacuum hoses that were also attached to the Air Intake that looks like they went down to a sensor that is underneath the power steering pump on the left side but they have been broken off for a while and just hanging there. When I take the two hoses that were going to the sensor at the bottom of the power steering pump and put them together the truck will idle perfect for a little while until I put it in drive and run it for a minute or two but after that it again it will die. If I leave them off and plug the lines shut it will just die. I don't know what else to do? Any clues to what could have happened? What is the sensor under the power steering pump? Why would it idle worst after replacing the parts than it did when they were broke? I put everything back on like it was. The vacuum hoses match my vacuum diagram and everything else looks okay. Oil pressure and temperature are fine. Any clues to what might be the problem.
Prior to me doing this it ran okay and didn't really have anything major wrong with it except the idle was a little low (only about 500rpm) and when you drove it for a while and stopped it would jump idle for about 200-500rpms for a few secs and clear back up to 500rpms.
After I replaced the parts and put everything back together I noticed I had two vacuum hoses that were also attached to the Air Intake that looks like they went down to a sensor that is underneath the power steering pump on the left side but they have been broken off for a while and just hanging there. When I take the two hoses that were going to the sensor at the bottom of the power steering pump and put them together the truck will idle perfect for a little while until I put it in drive and run it for a minute or two but after that it again it will die. If I leave them off and plug the lines shut it will just die. I don't know what else to do? Any clues to what could have happened? What is the sensor under the power steering pump? Why would it idle worst after replacing the parts than it did when they were broke? I put everything back on like it was. The vacuum hoses match my vacuum diagram and everything else looks okay. Oil pressure and temperature are fine. Any clues to what might be the problem.
08-08-2010, 05:29 PM
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those vacuum lines to the power steering is not to a sensor, what that is is when you turn the steering wheel the power steering pumps in these they like to change the idle, this allows a regulated vacuum leak to increase idle while the steering is moving.
08-08-2010, 05:35 PM
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Cool thanks. Didnt have a clue about it. But I know that wouldnt keep it from just sitting there and not being able to idle properly. Could it be the Throttle Positioning Sensor since I did have some problems with the idle prior to changing out the stuff?
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