LS Swap purge solenoid - The 1947 - Present Chevrolet & GMC Truck Message Board Network

low82c10 · 11-13-2012, 10:56 PM

2004 5.3/4l60 swap.....does any one know if the purge solenoid valve is suppose to always have vacuum or does that computer kick it on? i have no vacuum on the valve so i can connect the hose to my canister. i tried another solenoid and i do have 12v to the red wire going to it.

clinebarger · 11-13-2012, 11:26 PM

Its PCM controlled, Without a tank pressure sensor & vent solenoid the EVAP system will not work anyway.

Evil Trailblazer SS · 11-13-2012, 11:28 PM

The purge solenoid is for the EVAP system from the original fuel system in the vehicle you pulled the 5.3 from. You will need to simply cap it.

If you are running the stock MAF sensor from the donor vehicle this wont apply to you, but when I built my Trailblazer, I removed the purge solenoid port and drilled it out, tapped it to 3/8npt and used it as the Intake Air Temp sensor. With the Procharger and meth injection, this was the only way to get the truest reading of intake air temps...for you, this will only be useful if you are going to run Speed Density tuning and you won't have a MAF...

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low82c10 · 11-14-2012, 08:55 AM

what i am trying to do is just have vacuum from the purge valve to my canister for my emission test

Evil Trailblazer SS · 11-14-2012, 11:02 AM

Then pop the valve off and hook a vacuum line up to the nipple from your charcoal canister and you are done. It's behind the throttle blade so vacuum will be there.
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low82c10 · 11-14-2012, 11:49 AM

So by removing the purge valve there should be vacuum at that port? Just remove the valve, and put my hose from canister to the hole where the purge valve sits in?
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Evil Trailblazer SS · 11-14-2012, 11:55 AM

Yep, the port is simply a hole into the intake plenum...perfect for a vacuum port!
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low82c10 · 11-14-2012, 12:08 PM

Where I put the hose from the purge valve hole to my canister? My canister has one from fuel tank which goes to my fuel tank and then I got carb bowl I think and Pvc and last I think I have air inlet which I think it gets it fresh air from there
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Evil Trailblazer SS · 11-14-2012, 12:14 PM

I believe it would be whichever vacuum line connects to the carb will be the line you connect to the purge port...
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low82c10 · 11-14-2012, 11:14 PM

thanks i gotta find a way to connect a hose to that hole properly?

Evil Trailblazer SS · 11-14-2012, 11:40 PM

My purge valve's port was an 1/8" nipple, so slipping a vacuum line into it would have been easy. On the 5.3 intake, it may be different...post a picture for me and I'll give you some ideas!
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11-13-2012, 10:56 PM	#1
low82c10 Registered User Join Date: Mar 2012 Location: Chandler Arizona Posts: 104	LS Swap purge solenoid 2004 5.3/4l60 swap.....does any one know if the purge solenoid valve is suppose to always have vacuum or does that computer kick it on? i have no vacuum on the valve so i can connect the hose to my canister. i tried another solenoid and i do have 12v to the red wire going to it.

11-13-2012, 11:26 PM	#2
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: LS Swap purge solenoid Its PCM controlled, Without a tank pressure sensor & vent solenoid the EVAP system will not work anyway.

11-13-2012, 11:28 PM	#3
Evil Trailblazer SS Big Gulps Huh? Whelp... Join Date: Apr 2010 Location: Reno, NV Posts: 410	Re: LS Swap purge solenoid The purge solenoid is for the EVAP system from the original fuel system in the vehicle you pulled the 5.3 from. You will need to simply cap it. If you are running the stock MAF sensor from the donor vehicle this wont apply to you, but when I built my Trailblazer, I removed the purge solenoid port and drilled it out, tapped it to 3/8npt and used it as the Intake Air Temp sensor. With the Procharger and meth injection, this was the only way to get the truest reading of intake air temps...for you, this will only be useful if you are going to run Speed Density tuning and you won't have a MAF... Posted via Mobile Device __________________ "The Ghost II" - 1987 V30 CC, 14-BFF (2nd Design Heavy Ribbed HD) SRW Conversion, 454/4L80E/205, 6" Springs, 35" Toyo MT's on 17" Classic II's, Full Audio System, Lot of Other Goodies!

11-14-2012, 08:55 AM	#4
low82c10 Registered User Join Date: Mar 2012 Location: Chandler Arizona Posts: 104	Re: LS Swap purge solenoid what i am trying to do is just have vacuum from the purge valve to my canister for my emission test

11-14-2012, 11:02 AM	#5
Evil Trailblazer SS Big Gulps Huh? Whelp... Join Date: Apr 2010 Location: Reno, NV Posts: 410	Re: LS Swap purge solenoid Then pop the valve off and hook a vacuum line up to the nipple from your charcoal canister and you are done. It's behind the throttle blade so vacuum will be there. Posted via Mobile Device __________________ "The Ghost II" - 1987 V30 CC, 14-BFF (2nd Design Heavy Ribbed HD) SRW Conversion, 454/4L80E/205, 6" Springs, 35" Toyo MT's on 17" Classic II's, Full Audio System, Lot of Other Goodies!

11-14-2012, 11:49 AM	#6
low82c10 Registered User Join Date: Mar 2012 Location: Chandler Arizona Posts: 104	Re: LS Swap purge solenoid So by removing the purge valve there should be vacuum at that port? Just remove the valve, and put my hose from canister to the hole where the purge valve sits in? Posted via Mobile Device

11-14-2012, 11:55 AM	#7
Evil Trailblazer SS Big Gulps Huh? Whelp... Join Date: Apr 2010 Location: Reno, NV Posts: 410	Re: LS Swap purge solenoid Yep, the port is simply a hole into the intake plenum...perfect for a vacuum port! Posted via Mobile Device __________________ "The Ghost II" - 1987 V30 CC, 14-BFF (2nd Design Heavy Ribbed HD) SRW Conversion, 454/4L80E/205, 6" Springs, 35" Toyo MT's on 17" Classic II's, Full Audio System, Lot of Other Goodies!

11-14-2012, 12:08 PM	#8
low82c10 Registered User Join Date: Mar 2012 Location: Chandler Arizona Posts: 104	Re: LS Swap purge solenoid Where I put the hose from the purge valve hole to my canister? My canister has one from fuel tank which goes to my fuel tank and then I got carb bowl I think and Pvc and last I think I have air inlet which I think it gets it fresh air from there Posted via Mobile Device

11-14-2012, 12:14 PM	#9
Evil Trailblazer SS Big Gulps Huh? Whelp... Join Date: Apr 2010 Location: Reno, NV Posts: 410	Re: LS Swap purge solenoid I believe it would be whichever vacuum line connects to the carb will be the line you connect to the purge port... Posted via Mobile Device __________________ "The Ghost II" - 1987 V30 CC, 14-BFF (2nd Design Heavy Ribbed HD) SRW Conversion, 454/4L80E/205, 6" Springs, 35" Toyo MT's on 17" Classic II's, Full Audio System, Lot of Other Goodies!

11-14-2012, 11:14 PM	#10
low82c10 Registered User Join Date: Mar 2012 Location: Chandler Arizona Posts: 104	Re: LS Swap purge solenoid thanks i gotta find a way to connect a hose to that hole properly?

11-14-2012, 11:40 PM	#11
Evil Trailblazer SS Big Gulps Huh? Whelp... Join Date: Apr 2010 Location: Reno, NV Posts: 410	Re: LS Swap purge solenoid My purge valve's port was an 1/8" nipple, so slipping a vacuum line into it would have been easy. On the 5.3 intake, it may be different...post a picture for me and I'll give you some ideas! Posted via Mobile Device __________________ "The Ghost II" - 1987 V30 CC, 14-BFF (2nd Design Heavy Ribbed HD) SRW Conversion, 454/4L80E/205, 6" Springs, 35" Toyo MT's on 17" Classic II's, Full Audio System, Lot of Other Goodies!



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