So I've been fabri-cobbling the hot side together on my spare motor when I discovered that I ordered the wrong flex coupler from summit, a 2.5"..... This was Thursday so I rushed down to the local speed shop and ordered the proper 2.25" flex coupler from them.... and got another 2.5". 😡
Double fail. Plus I wanted the bellows style not the woven style. Back to the speed shop.
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Without the Log side of the manifold this is where she sits. Tacked and ready to weld out.
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Nothing fancy, 16ga 2.25" steel. I will upgrade to stainless later, once I am satisfied with everything and I have a proper fab table to work on. Standing to tig sucks.
So after that I decided to tackle some idle issues I've been working on. I have no issues getting it to idle in neutral, it will hold 700rpm no problem, IAC, fuel and timing have been messed with endlessly and without success. As soon as I drop it to reverse it stalls. It's weird because this is new with the trans rebuild....
In my diagnosis I switched back to the stock 31lb injectors, I have noticed a strong fuel smell in the garage and that my rail pressure was bleeding off, it never did that before either. So the 210 injectors must have picked up some debris from the fuel system.... even with a 10 micron filter before the regulator. Annoying but not really a huge problem, they just need a cleaning. Might as well flow test at the same time.
Further in the diagnostics I went to test my vacuum modulator, make sure the pump was unloading at idle.... That's when I found this gem.
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Seems someone was in a rush to put the intake on and bolted it up with the trans vacuum line under the #8 injector. Nice.... weird it didnt have a vacuum leak but after some diagnostics with a vacuum pump and watching my trans pressure gauge on the Holley dash I have normal pressure modulator function and a better shift at idle.
I dug a little further into the stall on shift issue and it seems this is a normal thing for 4L80e's. The oil circuit that supplies the converter doesnt have enough flow to fully disengage a triple disc lockup converter. Luckily Sonnax makes an upgrade valve to divert more flow to the lube system and away from the line pressure system for better lockup disengagement. It also moves more fluid through the cooler and rear lube so it's on the list for this winter. I dont remember if I specified my converter specs to my trans builder, gonna have to check that out.