So I bought a Motordyne M370 that i was planning on installing, which I did yesterday. Made my own T-fittings to connect all the vacuum lines. Went to start runs like crap. Idling all over the place dips low, shakes, shoots back up. Just a nightmare. Reset ECu throttle position relearn, IAC relearn no avail. So this morning I said forget it, going back to stock because I need my car for work. Put everything back the way it was when I took it off, still idling poorly.

So again, peddle dance it up reset everything I need to reset, still running poorly. So I got it to hold(not very well) just as in not dying on me and I started spraying Throttle body cleaner around the intake plenum and it goes from almost dying to shooting up. I did this because I heard a hissing noise from the driver side.

My question is what should I do honestly? I've been searching and searching for the torque specs for the oem intake plenum and haven't found anything for our car. even checked around the FSM and nothing I could see. Any help would be great everyone :'(

 

Of course I found the ft-lb specs now, it's 8 ft-lbs. I don't have a wrench that goes that low. I know they're tight enough, possible even too tight, but I know nothing cracked or anything like that. Blah, this has been a terrible weekend.

 

Sounds like a vacuum leak if the only constant variables are the hoses and clamps. I would also check the MAF's and plugs. To me, those are the only things it could be unless you took more things apart that you didn't need to.

 

I found out since my car is in pieces now lol, that when I over-tightened the plenum bolts it must have cracked the lower plenum somehow. there is a hole in the side of it right by the threads fro the bolt. Getting a new lower plenum locally for cheap, going to get it milled to spec, new gaskets on the way as well. Thanks for your replay though!

 

Oh man :/ At least you found it and learned your lesson, use the manuals ft/lb specs bro!