Help! broke vacuum tree on thermostat housing! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mckpaul · 10-06-2007, 09:54 PM

By the way, really like the flat black. Been wanting to do that to mine for a long time. Maybe someday.....

86-C10-V6 · 10-08-2007, 02:46 PM

I think mcpaul is mostly correct however I believe the EFE valve is located on the drivers side and when the engine is cold the valve is activated by vacuum which causes the exhaust gases to pass through the intake manifold and exit through the opposite exhaust manifold.
If you plug the vacuum line, the performance will degrade slightly during cold engine running and you will have higher emissions during that time.
Hope this helps

Rc 415 · 10-08-2007, 08:35 PM

Quote:

Originally Posted by mckpaul

By the way, really like the flat black. Been wanting to do that to mine for a long time. Maybe someday.....

Thanks for the help guys, I appreciate it, blocked off the hoses and it works great. I like the flat black too, a lot of people do actually, unfortunately its fading really bad on the hood and roof, so I gotta start saving for the paint job now...

10-06-2007, 09:54 PM	#1
mckpaul Registered User Join Date: Dec 2002 Location: Houston Posts: 300	Re: Help! broke vacuum tree on thermostat housing! By the way, really like the flat black. Been wanting to do that to mine for a long time. Maybe someday..... __________________ Paul 1984 Chevy C-10 LWB/305

10-08-2007, 02:46 PM	#2
86-C10-V6 Shadetree Mechanic Join Date: Oct 2002 Location: Youngsville, NC Posts: 100	Re: Help! broke vacuum tree on thermostat housing! I think mcpaul is mostly correct however I believe the EFE valve is located on the drivers side and when the engine is cold the valve is activated by vacuum which causes the exhaust gases to pass through the intake manifold and exit through the opposite exhaust manifold. If you plug the vacuum line, the performance will degrade slightly during cold engine running and you will have higher emissions during that time. Hope this helps __________________ Dave M. (Hacksaw) 86 C10 Scottsdale LWB, 4.3L, Edelbrock 1904, K&N, 700R4, 3.08 Auburn Performance 89 GMC S-15 Extended Cab 4x4, 4.3L, FI 98 K1500 Xcab, 5.7L, 3.43 Gov-Lok



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