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Old 04-23-2012   #11
GOLDCYLON
 
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Default Re: Secondary Port Throttle Actuator vacuum leak

Quote:
Originally Posted by Z51JEFF View Post
Daryll,Ill take these if the OP passes.

Jeff I shipped them already. I have another pair but they are not almost new like these were.
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GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's)

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91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat

90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat

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Old 04-23-2012   #12
Paul Workman
 
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Default Re: Secondary Port Throttle Actuator vacuum leak

Quote:
Originally Posted by XfireZ51 View Post
I got an idea! Pull the throttle plates on the secondaries and we'll throw in a chip that has secondary injectors turn on at anything above idle. You can unplug the secondary MAP sensor and air pump.
Yep! Parts not used seldom fail, and they don't cost anything to replace!

OP: Like most of us that have pulled the secondaries, they haven't given me a lick of trouble since. AND, I like the crisp throttle response, and the clean intake valves!

P.
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Old 04-23-2012   #13
boostedmaxPSI
 
Join Date: Apr 2012
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Default Re: Secondary Port Throttle Actuator vacuum leak

Took apart the Secondary Actuator to see if my suspicion was correct and it was. The internal spring was not centered causing some binding. the point where the smaller end of the spring that meets the center point of the base was not opened up enought to fully seat around the base point.

I opened the spring up just a bit to see what would happen and the spring stays where it should be, centered.

I'm going to attempt to put this one back together to see if the condition improves. I have nothing to loose given two are on the way.

Base of the spring too small (before modifing the spring)




Spring not centered. This is how the spring was situated when I pulled actuator apart.




This is with the spring opened up a bit more so it could fully seat around the base and stay centered.

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Old 04-24-2012   #14
scottfab
 
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Default Re: Secondary Port Throttle Actuator vacuum leak

Frank I applaud your decision to stay with the stock setup.
Long term value could well be in how close you stay stock.
(or returnable to stock)
Remembering back I think it was Mark H. that found a lot
of actuators coming from the GM dealership that were defective
in the same way you're seeing.

About 10yrs ago I developed a replacement idea using electrically operated solenoids. I have them still and the brackets for mounting. All that remained was working out where to tie into the electronics which will be trivial once the need arises.
And there in lies the catch. My secondaries have not failed since I worked on them in 99. Once they do begin to act up again I intend to swap out the actuators. This will be reversible and will not require a chip mod which in itself is a potential maintenance issue. (replacement parts)

Good luck with the new parts.
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Old 04-24-2012   #15
GOLDCYLON
 
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Default Re: Secondary Port Throttle Actuator vacuum leak

Quote:
Originally Posted by boostedmaxPSI View Post
Took apart the Secondary Actuator to see if my suspicion was correct and it was. The internal spring was not centered causing some binding. the point where the smaller end of the spring that meets the center point of the base was not opened up enought to fully seat around the base point.

I opened the spring up just a bit to see what would happen and the spring stays where it should be, centered.

I'm going to attempt to put this one back together to see if the condition improves. I have nothing to loose given two are on the way.

Base of the spring too small (before modifing the spring)




Spring not centered. This is how the spring was situated when I pulled actuator apart.




This is with the spring opened up a bit more so it could fully seat around the base and stay centered.


Never seen one of these apart before. Cool pics.
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GOLDCYLON - 91 ZR-1 #2014
GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's)

GOLDCYLON - 11 CTS-V


Arizona State Director




91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat

90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat

11 RED/GREY CTS-V
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Old 04-24-2012   #16
boostedmaxPSI
 
Join Date: Apr 2012
Location: TEXAS
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Default Re: Secondary Port Throttle Actuator vacuum leak

UPDATE:

So with nothing to loose, I was able to correct the spring location by widening the spring base a bit and track down a very small pin hole leak. Sealed the leak and put it back together.

IT WORKS. check the video out. The actuator will now hold vacuum with as little as one pump on the vacuum gun.

http://www.youtube.com/watch?v=MlkNWBNtaYo


Question:

What is the correct orientation for the actuator arm. Notice the slight angle. Does the angle point to the center of the engine or to the IH?

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1966 Mustang GT tribute
1988 Callaway Twin Turbo Aerobody (FOR SALE pm me for more info)
1991 Callaway CR1 SuperNatural 475 Aerobody
1992 Callaway SuperNatural 435 Aerobody (sold)


For Sale:
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Old 04-24-2012   #17
scottfab
 
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Default Re: Secondary Port Throttle Actuator vacuum leak

I looked at my photo archives and can't find what I'm looking for.
However this was the source of a lot of exchanges on the ZR1Net mail list
years ago. There were many actuators that were mounted upside down.
Thing is without the pics I can't tell which way it should be.
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Old 04-24-2012   #18
boostedmaxPSI
 
Join Date: Apr 2012
Location: TEXAS
Posts: 171
Default Re: Secondary Port Throttle Actuator vacuum leak

Quote:
Originally Posted by scottfab View Post
I looked at my photo archives and can't find what I'm looking for.
However this was the source of a lot of exchanges on the ZR1Net mail list
years ago. There were many actuators that were mounted upside down.
Thing is without the pics I can't tell which way it should be.
Thanks for looking Scott. The actuator arm with the slight angle, is mounted with the angle towards the IH.

Frank
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1966 Mustang GT tribute
1988 Callaway Twin Turbo Aerobody (FOR SALE pm me for more info)
1991 Callaway CR1 SuperNatural 475 Aerobody
1992 Callaway SuperNatural 435 Aerobody (sold)


For Sale:
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