Efe stuck closed?
Joined: Aug 1999
Posts: 19,282
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Supreme Member
Joined: Sep 1999
Posts: 7,072
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From: Philly, PA
Re: Efe stuck closed?
Um.... no, I don't think so. At least I haven't encountered backfiring due to it sticking closed. But it'll sure feel like somebody stuck a banana up your tailpipe when you dip deep in the throttle.
Just pull the vacuum line off the TVS switch up near the intake and apply/release vacuum to it while you watch the arm on the side of the EFE valve move. It's pretty obviousl if it's working properly. There's also a one-way check valve in that line that sometimes goes bad and holds vacuum at the EFE, causing it to stay closed constantly, regardless of engine temp or manifold vacuum.
Just pull the vacuum line off the TVS switch up near the intake and apply/release vacuum to it while you watch the arm on the side of the EFE valve move. It's pretty obviousl if it's working properly. There's also a one-way check valve in that line that sometimes goes bad and holds vacuum at the EFE, causing it to stay closed constantly, regardless of engine temp or manifold vacuum.
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