air injection rail

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May 17, 2011 | 07:16 PM

#16

octaneforce

Thread Starter

Laughing Gas

Joined: Mar 2009

Posts: 1,028

Likes: 0

From: long island

i finished up doing my air injection rail a little while ago. it ended up taking me a little over 3 hours. this truck has never been so quiet! it runs smoother and less choppy too. i am really satisfied with my results. i also did my valve cover gasket while i was in there. i took a picture of my head. i couldnt believe how clean it was for a 20 year old engine with 171k miles.

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definitely a success considering i decided to do all of this with some spare time on a Tuesday.

Mar 11, 2013 | 04:23 PM

#17

4Diggin

New User

Joined: Feb 2013

Posts: 19

Likes: 0

From: NPR, FL

Air Injection Rail Leaks

Quote:

Originally Posted by octaneforce

the air injection rail on my 92 300 is cracked in a few spots and needs replacing. my mechanic told me it would be 4 hours of work for him to do it. i looked at it and im pretty sure i can do it myself. it looks like you just have to take off the top of the intake plenum and the throttle body. is there anything else im missing? do those weird studs that screw into the head just screw out? of course it looks straight forward, but it will probably end up taking me all day like everything else

also- would a badly cracked air injection rail make noise? my truck sounds like it has an exhaust manifold leak, but my exhaust manis are new, as well as the intake/exhaust gasket. this cracked rail really seems like the only thing left that could make noise.

I was new to the EFI 300 when i bought my truck (used w/186,000 miles) and didnt even know it had an air injection rail. I took it in for an exhaust leak and learned they had all rusted off and been previously welded shut, but still leaking. Short of the long is if there leaking you will definitly hear it.