It was on the bottom of the intake runners, there are 2, what are they and what do they do? they both have 2 vacume lines going into them?
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What the hell is this crazy thing!?
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that my friend is a VSV. its a Vacuum switching device.
typically found on your EGR and Fuel Pressure Regulator for vacuum signal.
typically found on your EGR and Fuel Pressure Regulator for vacuum signal.
I have an aftermarket FPR and no EGR, can I unplug them from the harness and block off the vacume lines? What does the computer have to do with it?
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the computer just monitors what its doing etc. If you unplug them you might throw a CEL (Check Engine Light). A few members have suggested measuring the resistance of the VSV and installing a resistor rated @ the same resistance as the VSV to prevent it from throwing a CEL. But yes you can unplug 
I dont wanna throw a code because then if I throw one my check engine light will come on then I wont know when a new one comes in lol
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I duno where the hell all this resistor talk is coming from... I am only running my FP VSV, and won't even be running that soon... I have no check engine light, or codes.
Lol, good grief. What justin said. The egr and FPU VSV's are ecu outputs and aren't monitored. That's not to say certain effects of them aren't monitored (they are) but you won't get any codes if you remove the VSVs. On cars with an egr temp sensor it could be a different story.
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i was throwing EGR codes when my vsv was disconnected so i dont know where you got that idea...jetjock said:
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NDBoost said:
What codes were you seeing? If you have a later Cali car you might get codes associated with egr temp sensor operation (I'd have to check my books) but you'll never get codes from a disconnected VSV directly. Where do I get this information? Not only is it common electrical sense but in addition to owning a MKIII for 19 years I could refer you to my extensive TCCS library, including internal Toyota manuals not generally available to the public.
Shaeff: Since you brought it up, Cali cars not only have differences in emissions equipment but also have different programming than do Federal cars, both for running and for code diagnostics.
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As I mentioned in the other post a code can occur if you disconnect an output but the code would be based on a secondary effect, not from monitoring the output itself. The TCCS has no idea if your VSVs are connected or not but in the case of the egr it might complain about the temp sensor (if you have one) because removing the VSV disabled the egr system.
You'll never get a code from yanking the FPU VSV as there are no secondary effects that could cause a code. You'll lose the benefit of having the FPU system so I personally don't see the point in doing it.
Shaeff: The Cali programing is more stringent in fault detection. For example, a fault in the air temp sensor signal (THA) in the AFM will be reported in a Cali car while it won't in others...or so say the books. I'd have to verify it to be sure.
You'll never get a code from yanking the FPU VSV as there are no secondary effects that could cause a code. You'll lose the benefit of having the FPU system so I personally don't see the point in doing it.
Shaeff: The Cali programing is more stringent in fault detection. For example, a fault in the air temp sensor signal (THA) in the AFM will be reported in a Cali car while it won't in others...or so say the books. I'd have to verify it to be sure.
Totally forgot about those silly california cars, my apologies.
From what I've read the EGR is monitored by the ECU on cali cars... that's why you're throwing a code.
From what I've read the EGR is monitored by the ECU on cali cars... that's why you're throwing a code.
LMAO
"Lets all pull random parts off with NFI what they do and what it will effect cos it's gonna give me a bazillion HP yo"
"Lets all pull random parts off with NFI what they do and what it will effect cos it's gonna give me a bazillion HP yo"
"NFI" and "bazillion HP"....lol.
Not to mention the nightmare it'll make for a future owner, especially if he or she lives in an emissions state. It's a shame some of these cars get hacked up so much. On the other hand some people do a real nice job.
Not to mention the nightmare it'll make for a future owner, especially if he or she lives in an emissions state. It's a shame some of these cars get hacked up so much. On the other hand some people do a real nice job.