Hauntingly familar secondary failure #3

[GOLDCYLON]

Most are familiar with this post of mine. I present the 3rd documented failure of the secondary screws


http://www.zr1.net/forum/showthread....ght=compelling



I present yet once again another secondary screw failure and the result on the number 8 piston. For those doubting Thomas's out there. Background.. a local mechanic and friend of mine is currently working on a local ZR-1 customer (No idea who the customer is) and contacts me for advise, parts finding etc for the ZR-1. Yank the secondary's folks. GC

[LGAFF]

I think the same happened to 90 #702, the engine I purchased, same damage

[GOLDCYLON]

That makes 4 that I know about then Lee

[John Boothby]

I would yank my secondaries, but I don't know how that would affect the smog check? As it is, if I forget to turn the power key off, I fail the smog check. With the power key off it passes.

[GOLDCYLON]

Originally Posted by John Boothby

I would yank my secondaries, but I don't know how that would affect the smog check? As it is, if I forget to turn the power key off, I fail the smog check. With the power key off it passes.

Your right John depends on the State. Sniffer test I would say yes. Treadmill no way in hades.

[Kevin]

Originally Posted by GOLDCYLON

That makes 4 that I know about then Lee

4 out of 7,000 aren't we crying wolf a bit early?

[efnfast]

I think I asked before, but what are the down sides of yanking them.
Might be an issue with emitions (sp).
Certainly not OEM, or NCRS.
Needs a chip reprogram.
?

[GOLDCYLON]

Originally Posted by Kevin

4 out of 7,000 aren't we crying wolf a bit early?

Kevin there are no where near 7000 left maybe 5500 after crashed and parts out. regardless its a thing to consider if your are getting head work done and a while your are there type of thing like replacing a headgasket. My argument is not to start taking your car apart. I am simply presenting 4 cases with documentation that we know about. How many that we don't know about? Would you rather be educated about the possibly or not or have the wolf bite you in the full point of contact later? GC

[GOLDCYLON]

Originally Posted by efnfast

I think I asked before, but what are the down sides of yanking them.
Might be an issue with emitions (sp).
Certainly not OEM, or NCRS.
Needs a chip reprogram.
?

None expect emissions as a possibility. Yes maybe a chip reprogram if your doing headwork, you are removing the code 61 (secondary failure) for ever and cleanup a lot of room under the plenum, No more actuators its a total win. Cliffs done a great writeup on the process in his solutions pages. GC

[Dynomite]

Originally Posted by GOLDCYLON

Most are familiar with this post of mine. I present the 3rd documented failure of the secondary screws

Daryll......you definitely need one of these Whistler Wireless Inspection Camera 9mm Model IC-3709PX or comparable to put your mind at ease.....that is what I got it for

Originally Posted by Dynomite

I have a Whistler Wireless Inspection Camera 9mm Model IC-3709PX. The camera probe will fit easily into a spark plug port. With the piston at BDC you can actually place a bend in the camera probe cable and by rotating the camera probe cable can look at the side walls of the cylinder. The tops of the pistons can be visually inspected 360 deg.

One can insert the camera probe between the runners and above/below the fuel rail inspecting all sorts of items under the plenum. You can even watch the secondaries function as you like hot wiring Pin C17 with a Pin Probe as described by Marc Haibeck Secondary Operation without removing the Plenum

And You can use the inspection camera to look at brake pads, under the dash in places you can only stick a screw driver poking the camera probe between wiring to look beyond wiring, inspection of front cover for leaks, inspection of water pump for leaks, inspection of front seal, inspection for bolts dropped and caught between headers, checking smoothness of secondary operation, inspection of vacuum hoses under plenum, inspection of wiring under plenum, and if you want you can inspect inside your differential case after you have drained the fluid (same with transmission, and oil pan), and especially inspection for those very hard to find oil leaks around the OPRV (Oil Pressure Regulating Valve Cover)

Tech Info - Marc Haibeck on LT5 Eliminated Secondaries

Marc Haibeck mentioned to me some time ago....Haibeck Automotive Technology
Removing the secondaries is not a bad idea. Marc dyno tested removing the secondary throttles and found no significant changes.

Marc suggested there are three situations where removing the secondaries are useful.
1. If you are having a problem with them that you can't fix, they can be eliminated.
2. If you can't find a repair part.
3. If you have removed them to port the heads, you can save time and not reinstall them.

Marc also mentioned that removing the secondaries does not effect the idle, fuel economy or torque over 1500 rpm. Having the secondaries in place might be an advantage for an emission test.

Further, with the elimination of the secondary port throttle control the engine idles on the primary injector only. When the main throttle is opened to about 1/2% or more the secondary fuel injector activates. This usually happens while the clutch is being slipped to drive away, typically the engine is running on both fuel injectors before the clutch fully engages. Once the throttle is more than 1/2% open the flow split between the primary and secondary injectors is the same as the OE value of 50%-50% and in sync with each other.

I might also mention eliminating the associated vacuum system and secondary cannisters gets rid of a lot of potential failures later on and makes for a clean looking LT5 installation.

Also keep in mind eliminating the air injection system may have ramifications in regard to a SMOG check depending which State you reside. I have also eliminated the original Exhaust Manifolds and CATS which would be required in some States for SMOG check success.

See LT5 Eliminated Systems