Sorta a Stupid Question, But its not the first time...


The Stock Exhuast gas Crossover "flap" in the passengerside Manifold/ypipe union, When Disconnected from a vaccum Source, DEfaults to what position, Open Or closed ?


The reason I ask this is that I have an Annoying clattering sound Coming right from that location and when I manually acuate the lever, it stops. The car Also Seems to perform Better, Run smoother, ect...

What I want to know is, is this due to the Flap being defaulted closed and I can Manually actuate it Open allowing for proper exhuast flow. After I drive for a while It will Fall back To its default position, So I would need to wire it open I assume to keep it from closing On me.


Anyway, The long and the short of it is That i want it to Be Open all the time, of course, and I belive that it is sticking closed On me.

Any information on the subject is appriciated.


Thanks

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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver 14.82 @ 91.1 (faster than Ed)
Reader's ride -> My Ride

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

 

If the spring is still good in the vacuum servo, the default is open with the vacuum removed. I removed the line from the temp/vacuum switch on mine when I was running it at the track last summer.

The butterfly has been known to come loose from the shaft on these valves and flip closed. You might want to go ahead and drop your y-pipe and check it out since yours rattles.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam and intake, World 305 heads, Hooker headers & y-pipe, 3" Catco cat & 3" cat-back).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

 

Oh, and I think the technical name for it is "Early Fuel Evaporation" valve, or EFE valve. Used to call them heat riser valves in the old days.

 

Hmm, Well Mine doesent spring anywhere, It goes where I put it, So I suppose its quite possible its in there flopping around w/ exhuast flow.

Thanks, Ill take a look at it.



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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver 14.82 @ 91.1 (faster than Ed)
Reader's ride -> My Ride

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

 

It should have a spring that holds it open; and the shaft is offset such that exhaust tries to force it open besides. The old-style "heat riser" valve had a thermostatic spring and a weight instead of a vacuum motor.

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"So many Mustangs, so little time..."
ICON Motorsports

 

At least the 85 and 86 TPI cars have a cast iron spacer that takes the place of that piece of junk... Just a thought.

 

Really mad, Hmm May be worth a trip to the yard then, If I can't get a peice of Baling wire to work.

Of course, I could just get headers...


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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver 14.82 @ 91.1 (faster than Ed)
Reader's ride -> My Ride

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

 

Don't waste your time getting one of those at a boneyard, they're mostly about like yours by the time they make it there. You can get new ones of those from the parts store, they don't even cost very much, maybe $30 some-odd

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"So many Mustangs, so little time..."
ICON Motorsports

 

Just get headers, and when you do get 'em for a later model FI car w/o that POS.

For now you can do what i did on my 85, remove it, gut it and seal the shaft hole with a bolt.
...ed

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Ed Maher - Moderator @ The TPI & Carb Boards
92 Z28 Convertible - Quasar blue / Tan top
LB9 4L60 GU2 G80 - stock, soon to be sleeper
-=ICON Motorsports=-

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die