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 3.0 vacuum sensor thing question...
#899175
08/07/08 03:02 AM
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Joined: Aug 2003
Posts: 2,311
OP
Forum Moderator
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On the back of the 3.0 there is a coolant sensor tower with 3 or 4 sensors. One is a blue one with 2 vacuum lines going to it. What happens when you break it and have to go without for a while?
Currently I have the 2 lines running into each other.
(aka suprathepeg, aka Sean)
89 v6 SWB truck "BLACK BEAUTY" EB valves, P&P head 30 over.
95 FZJ80. Lifted. locked and rollin on 33s (my dream machine)
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Re: 3.0 vacuum sensor thing question...
[Re: Rauch_Off_Road]
#899176
08/07/08 03:45 AM
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Joined: Jan 2000
Posts: 12,153
Web Wheeler
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Just a guess but that sounds like the BVSV my '85/22RE has that is a coolant temperature activated vacuum switching valve that sends intake vacuum to the EGR modulator. Basically there to prevent EGR operation when the engine is cold and allow it when it heats up. Later engines used an ECU-controlled VSV to do that same function. Not real familiar with the V6 engines, so it may be something else. See what the lines connect.
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Re: 3.0 vacuum sensor thing question...
[Re: Rauch_Off_Road]
#899177
08/07/08 11:34 PM
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Joined: Jan 2001
Posts: 11,595
Forum Moderator
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I beleive its some sort of idle up valve or something for your power steering. I broke mine and ran without it for months, diddnt even know it was broken, no side effects.
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Re: 3.0 vacuum sensor thing question...
[Re: Adam F]
#899178
08/09/08 06:15 PM
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Joined: Aug 2003
Posts: 2,311
OP
Forum Moderator
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so should the lines be attached together or plugged?
(aka suprathepeg, aka Sean)
89 v6 SWB truck "BLACK BEAUTY" EB valves, P&P head 30 over.
95 FZJ80. Lifted. locked and rollin on 33s (my dream machine)
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Re: 3.0 vacuum sensor thing question...
[Re: Rauch_Off_Road]
#899179
08/09/08 06:54 PM
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Joined: Jan 2001
Posts: 11,595
Forum Moderator
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Id plug them. Either just jam a bolt into the line, or trace the line and find where it hooks up to, and put a vacuum cap instead of the line.
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Re: 3.0 vacuum sensor thing question...
[Re: 4Crawler]
#899181
08/10/08 05:24 AM
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Joined: Apr 2000
Posts: 4,230
Roll Me Over
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You are asking about the sensors on the back of the engine. Looking at my FSM there is only one that looks like it has vacuum lines on it and it has nothing to do with idle up. It is a BVSV, one line comes from the charcoal canister and the other goes to a purge port on the throttle body. It is part of the emission system. It must open up when the engine reaches operating temperature and sucks the fumes out of the C.C.
David Fritzsche
1990 Ex-Cab V-6,5-speed, with a few mods
04.5 CTD Dodge 2500 Ram--Tow Rig
Roseville, CA
"Serenity through Sobriety"
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Re: 3.0 vacuum sensor thing question...
[Re: OOP'S]
#899182
08/26/08 08:40 PM
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Joined: Jul 2005
Posts: 15
Need a Spot
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Yep, what Oops said.... This is a Bevis valve. I broke mine aways back and spliced the line together. As I remember looking up the specs, it opens around 100 degrees. Living in Phoenix, I figured mine was open most of the time anyway...... I picked on up at You Pull it for 2 bucks but it's a ***** to get to, so i'll replace it the next time the intake is off.
I've noticed no difference without it.
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Re: 3.0 vacuum sensor thing question...
[Re: Zolton]
#899183
08/27/08 10:04 PM
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Joined: Apr 2000
Posts: 4,230
Roll Me Over
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Yep, what Oops said.... This is a Bevis valve. I broke mine aways back and spliced the line together. As I remember looking up the specs, it opens around 100 degrees. Living in Phoenix, I figured mine was open most of the time anyway...... I picked on up at You Pull it for 2 bucks but it's a ***** to get to, so i'll replace it the next time the intake is off.
I've noticed no difference without it. The easiest way to work back there is to take the hood off. You get a straight shot at it. Almost as easy as when you take the manifold off.
David Fritzsche
1990 Ex-Cab V-6,5-speed, with a few mods
04.5 CTD Dodge 2500 Ram--Tow Rig
Roseville, CA
"Serenity through Sobriety"
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