Repairing the weak "Y" on coolant line (between heads)

[GEN 3 SHO FAN]

Hi folks,

I started my repairs on the engine and unbolted all the upper intake. It seems that a hose on the small Y on coolant hose broke last summer. I'm now at the fuel rail. As I never dug so deep in the engine before, I have some questions...

1- There are some trick(s) to disconnect the electrical plugs of injectors without breaking them (as they are old plastic exposed to heat...) and to pop off injectors from their place ?

2- In the same time, could it be usefull to replace o-rings on injectors (16) or they are reliable the entire life of the car ? (I have no problems with them but i have new spares in hands.)

3- I remarked that all secondaries, even if they are wired open at max opening, seems to block/brake the air flow by 1/3 of their opening... As I have to retreive the lower intake, I'm wondering if it's a good thing to retreive meanwhile all the butterflies from the rods of the IMRC to help the engine breathe a little more (at first glance, like 1/6 of total air entering). Or it's usefull to have something on the way to brake air and have 2 sources of air with different speed to have a better air-fuel mix ?

Thanks for your input,

 

[gamefanatic]

1.) Nope. These things are brittle city. The good thing is so long as the rubber insulator is still on the connector, they pretty much stay in place. Plus with the intake on, they haven't much wiggle room.

2.) I only replace them if they are worn, brittle or broke. So long as fuel isn't coming out, there isn't a need to replace them. You could potentially put a small amount of o-ring grease on them. I haven't had to one either of my SHO's yet.

3.) I'm not following what you are saying here. Do you have a picture? Butterflies should open between 80-90°. If they aren't opening that far something may be restricting their opening.

Hope you replace the Y coolant line with something metal. Also recommend replacing the head coolant lines to the Y adapter with thicker silicone lines. I ended up using Vibrant heater hose. Its a tight fit, but I don't think they are going to break ever again.

Vibrant Performance 20435 Heater Hose, Black https://a.co/d/1RamcBC

Vibrant Performance 20445 5/8in ID x 5 ft Longsilicone Heater Hose, 1 Pack, Black https://a.co/d/5Epoqh1

 

[GEN 3 SHO FAN]

Hi Gamefanatic,

Yes, I will put a photo of the butterfiles. It's intriguing. Its more like a 65-70 degrees fully opened (they are all the same).

For the Y, yes, I bought one in brass. No more stress. But on Amazon, some imitations are sold, beware.

Thanks for the link on hose. I already found needed parts. Here it is (hose is an Amazon finds too) :

https://www.amazon.com/Joyway-Shaped-Union-Fitting-Intersection/dp/B07C6K8Y1Y?psc=1&pd_rd_w=k5nyo&pf_rd_p=87a48bff-0d65-465c-9848-dfd8668d09df&pf_rd_r=T2G5ZV5HE7RYVT7VKGQ1&pd_rd_wg=Ob3a9&pd_rd_r=211c28c9-807e-4c47-aed2-a40adae69482&content-id=amzn1.sym.87a48bff-0d65-465c-9848-dfd8668d09df&ref_=sspa_dk_rhf_yoy_pt_sub_8&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExN0tRNFFMNlo0Skg5JmVuY3J5cHRlZElkPUEwODA3MzkxR0FTVkRUWFFKQTFRJmVuY3J5cHRlZEFkSWQ9QTA5Njg2MTEyWVdHSzNVWUtCT0pTJndpZGdldE5hbWU9c3BfcmhmX3lveSZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

https://www.amazon.com/dp/B09V88K4NG/ref=sspa_dk_detail_1?ie=UTF8&pd_rd_i=B09V88K4NGp13NParams&s=automotive&sp_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWxfdGhlbWF0aWM&th=1

 

[GEN 3 SHO FAN]

Wow, it's an Eric seal of approuval right there !?

I mistaken about the hose, it's this one. Seems really though.

https://www.amazon.ca/Fuel-Stainless-Steel-Nylon-Braided/dp/B09ZKWCT4S?pd_rd_w=mzCnd&content-id=amzn1.sym.af74bb2c-0471-4d18-a5da-d9b17b5bd7dd&pf_rd_p=af74bb2c-0471-4d18-a5da-d9b17b5bd7dd&pf_rd_r=3ENXF34M0R4YSP3JQFYQ&pd_rd_wg=JQluX&pd_rd_r=4090bb40-105b-4264-8361-c08199f4f820&pd_rd_i=B09ZKWCT4S&ref_=pd_bap_d_grid_rp_0_1_ec_i&th=1

 

[GEN 3 SHO FAN]

Someone knows if its normal that I have no fuel pressure if the car had not run since 4 days ?

Here is one of the butterfly (not fully opens).

 

[gamefanatic]

Fuel pressure will typically go down after you turn off the car as this is a return system.

 

[GEN 3 SHO FAN]

Ha, thanks you, I tought about that but I wasn't sure that is a normal behavior.

For the secondaries, as you can see, it's not fully opened. I think I will unbolt all the plates to gain a better air flow there.

 

[GEN 3 SHO FAN]

I finished to unbolt the intake. It was in fact one of the hoses going to the Y. Someone knows what is the size of these hoses I bought 3/8 but its not good, even all the factory clamps are loose on this size, could it be 9/16 ?