Dual Modular Valve
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
That had to do with emissions, I forget the exact reasoning behind it though. That's the pink stripe modulator.
Yes, you can go with the single line modulator. Get the black stripe (or green stripe) and delete the vacuum line that goes in the side of the modulator.
Yes, you can go with the single line modulator. Get the black stripe (or green stripe) and delete the vacuum line that goes in the side of the modulator.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
I'm told that the dual-port valve was used on some EGR setups. There was a concern that the signal strength to the valve would be lowered when the EGR valve was open; so the same signal that goes to the EGR valve was ran to the secondary port of the dual-port valve to give a little extra pull. I'm also told that it's not really necessary, so there's no problem capping off the secondary port or switching to a single-port valve as Mike describes. I did the former on my Galaxie and had no problems.
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ApocalypseBob
1973 - 1979 F-100 & Larger F-Series Trucks
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Aug 11, 2015 09:13 PM
