80 Row vacuum and idle issues

[meichten]

Following up from my previous cold start thread

Found and re epoxied leak in airbox around pop off valve, looks like it was leaking at some point and silicon was used in addition to the original epoxy. That ultimately failed.


This allowed the car to start and then had very little power and rough idle.
Then replaced the mcu to airbox gasket, whistle stopped after that.
Also replaced o-rings for cold start injector.


After replacing the above items the car was drivable, however idle was off.

May have one more leak.

Anyone have luck fixing minor leaks on airbox or is total replacement the only route?

For now dropped it of at the local p shop to fine tune idle as I don't have co2 sensor equipment.

[boyt911sc]

Originally Posted by meichten

Meichten,

Maybe it is just an optical illusion but it caught my attention anyway. Why is the rubber intake boot seen in the picture has some missing piece? Pressure test the system using either soapy water or a smoke source to locate them.

Tony

Edit: The shadow played a tricked on my eyes. After a second look, it shows a different perspective. Nothing wrong with rubber boot.

[meichten]

Thanks Tony, appears to be epoxy above the vacuum line from po. ? Is am I better off just replacing the entire box or epoxy the leaks. I've read your other leak threads. Just waiting for lift to drop the engine for cis removal.

Also looking at the tbitz kit which would still require that portion of the box.

[Steve F]

I just went through this myself. With the box on my work bench I cleaned up all 4 edges with a dremel to get the crap off and left a point adhesion . Also replaced all screws (yours look different than mine) with 6-32 machine screws, washers and Ny-loc nuts.
Cleaned everything with brake cleaner and masked with blue tape to just leave about a 1/4 path. Next one edge per day , part edge up and level, added JB-Weld. Looked pretty tidy when I was done.

Sealed every port and used a bike air pump through a tire valve and stuck it in a 5 gal barrel , pumped it up a few psi and zero bubbles I ordered the Air Flow Sensor Boot and will confirm in a couple days if all goes well. It does look promising.

Hope this helps

[Steve F]

Forgot the pics

[meichten]

Steve, thanks for the input. Your pressure test setup looks great.