smsms Posted March 22, 2018 Share Posted March 22, 2018 (edited) Hi all, I just joined the forums. I bought a 77 280z a couple of days ago and I'm having trouble passing emissions. The previous owner installed a megasquirt EFI which wasn't really the issue during the test. However, some vacuum lines are missing. The EGR valve isn't connected to anything and the vacuum line diagram shows that I must have a BPT valve, which I don't. Would it be ok if I connect the EGR valve directly to the intake manifold? The other issue is the purge valve on the carbon canister isn't connected to anything either, form what I understand, it should be going into the throttle chamber where you can see that it's plugged in Thanks! Edited March 22, 2018 by smsms Image sizes Quote Link to comment Share on other sites More sharing options...
NewZed Posted March 22, 2018 Share Posted March 22, 2018 What type of test are you trying to pass? Just idle, or idle and 2500 RPM? Or some sort of visual? The hoses and devices are shown and described in the Emissions chapter of the FSM. Quote Link to comment Share on other sites More sharing options...
ZHoob2004 Posted March 22, 2018 Share Posted March 22, 2018 (edited) What did emissions fail you on? I have to do Arizona emissions (Tucson) and had no real problems with my 280z with all emissions removed. I failed the second time, but that was because of the liquid oil coming out of the tail pipe... Post up your emissions sheet, that'll give us a better idea where to start Edited March 22, 2018 by ZHoob2004 Quote Link to comment Share on other sites More sharing options...
smsms Posted March 22, 2018 Author Share Posted March 22, 2018 I failed the equipment test for the EGR and evap Quote Link to comment Share on other sites More sharing options...
ZHoob2004 Posted March 22, 2018 Share Posted March 22, 2018 Sounds like they actually do some inspection up there. Here they just look under the hood to make sure you have an engine. My EGR and evap were completely disconnected just like yours. If you just want to pass, I think you can just plug the egr valve into any port on the intake manifold and follow the diagram for the evap can. I'm not really sure about the "BPT valve." I'm pretty sure it has something to do with when EGR kicks in, but I don't know if it will have a negative effect on performance or emissions, but it'll probably get you past the visual just like that. Quote Link to comment Share on other sites More sharing options...
smsms Posted March 22, 2018 Author Share Posted March 22, 2018 I spent all night researching this, apparently the BPT valve controls how much vacuum the EGR valve receives, if I connect it to the intake manifold directly I guess the EGR will stay open. I dont know if that will affect the engine performance in a any way but if it gets me through emissions, i'm willing to try I guess. Quote Link to comment Share on other sites More sharing options...
NewZed Posted March 22, 2018 Share Posted March 22, 2018 1 hour ago, smsms said: I spent all night researching this, apparently the BPT valve controls how much vacuum the EGR valve receives, if I connect it to the intake manifold directly I guess the EGR will stay open. Where? Quote Link to comment Share on other sites More sharing options...
smsms Posted March 22, 2018 Author Share Posted March 22, 2018 I'm assuming the thermal vacuum valve is the one with the red cap in this photo if I bypass the BPT valve the the EGR valve will actually stay closed. since there's no BPT valve therefore it's technically always "open". Anyways I'm just spitballing here. I'm probably gonna delete the EGR after I pass emissions, so I just need it to look like it works and not do any damage in the process. Quote Link to comment Share on other sites More sharing options...
grantmanus Posted May 20, 2020 Share Posted May 20, 2020 Well, did you get it to pass? Quote Link to comment Share on other sites More sharing options...
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