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Username Post: EFE valve        (Topic#359905)
xstuntman 
Poster
Posts: 81

Loc: west Texas
Reg: 04-13-09
02-23-20 11:44 AM - Post#2787124    

Chasing gremlins.

Found my Early Fuel Evaporation valve on the passengers manifold not hooked up to the can but not sure on open/closed position. I've done away with an operational TSV valve so the EFE should be sprung wide open for no blockage when ignitions off or am i wrong and its closed under spring tension when connected to the vac can and ignition off?



 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25179
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
02-25-20 07:50 AM - Post#2787289    
    In response to xstuntman

Can you post a picture of it? Have you found any new information? Does the emission ID show its hose routing? Very few emissions items should work at start up. Most of our truck era emissions worked after the engine was warmed up.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


Edited by gchemist on 02-25-20 07:51 AM. Reason for edit: No reason given.

 
xstuntman 
Poster
Posts: 81

Loc: west Texas
Reg: 04-13-09
03-14-20 11:22 AM - Post#2788640    
    In response to gchemist

So I figured out it was supposed to be open with no vacuum applied. The pushrod was off and hanging and I'm probably lucky it hasn't caused any long term damage. I always thought it accelerated kinda slow but with a full tank of gas and me it's about 6000 pounds so i figured it was never gonna feel like my old 73 C10 anyhow. Definitely feels like a smoother acceleration at 40 mph and faster. Hit 70mph on the highway and runs great.

Gotta learn how to replace a.c. line line o-rings next.



 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25179
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
03-15-20 04:10 AM - Post#2788669    
    In response to xstuntman

Does the truck have R12 or R134? When installing new A/C o-rings, use the appropriate PAG oil. Using gloves, finger coat the o-rings before installation. I do it every time. The oil helps seal lines better. Replace the valve stems too. Most systems leak from $2.00 valve stems.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
xstuntman 
Poster
Posts: 81

Loc: west Texas
Reg: 04-13-09
03-21-20 07:57 PM - Post#2789186    
    In response to gchemist

Will do.
Thanks.



 
MikeB 
Ultra Senior Member
Posts: 10073
MikeB
Loc: Plano, TX
Reg: 08-28-03
03-22-20 10:18 AM - Post#2789239    
    In response to xstuntman

Sounds like your problem is solved, but found these notes from when my truck had a 250 six.

EFE: Early Fuel Evaporation
Page 6E-2 and 6E-15-6E-16 in 1982 service manual
Supplies a source of rapid heat to the induction system during cold “driveaway”. Should “turn off” after engine warm-up.

The Vacuum Servo type uses a valve and vacuum actuator which increases the exhaust gas flow under the intake manifold during cold engine operation. The valve is located in the exhaust and is vacuum operated. It is controlled by a Thermal Vacuum Switch (TVS), or an EFE solenoid controlled by the ECM. When vacuum is applied, the valve closes, causing the intake to heat up.

Watch the actuator arm when the engine is started. The valve should close when the engine is started cold; the actuator link will be pulled into the diaphragm housing.

Also see http://www.autozone.com/autozone/repairguides /GM-C...



1982 C10 SWB pickup: Unmolested base truck, original paint. Originally had 250 six and 3-on-the-tree
Now has 355 with Vortec heads, RamJet roller cam, LS6 beehive springs, TH350
Retired, but working part-time on 50s-70s cars & trucks.


 
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