Project 3.4 Camaro

The one off to the side of the CTS(the cts by waterneck for upper rad hose that is) that the fuel injector harness plugs into on the LIM, I intend to switch to my 3.4 manifolds and my first snag is that the 3.4 LIM has no provisions for w/e sensor this is, I am wondering if it perhaps has to do with the CSI, like some sort of auxiliary temp switch that tells the csi when to kick on or not? Also if anyone knows how to get apart a 3.4 tbody I am having difficulties getting the throttle shaft out.

Maverick H1L

iTrader: (8)

3.4 does not have the provision for the temp switch for the cold start injector... You'd need to swap over your existing lower intake if you plan on using it since there is no hole in the 3.4 manifold.

That switch keeps the CSI open until engine temp reaches about 100*F... Don't ask how, since as I understand it, the CRANK fuse is how the CSI gets its power and that is only used in starting and not running...

:edit: From what I understand, the middle intake is nearly identical between the 2.8/3.1 and 3.4, and I'm pretty sure the lower is identical with the exception of the CSI hole and possibly a bit of work in the front to accomodate the cam sensor, so your existing lower should swap over just fine. Or you could just not use the CSI (as in not hook it up), but I don't think there is a hole in the back of the intake for it either, so you would need a 3.1 fuel rail.

Project 3.4 Camaro

So my theory about it being a 2ndary temp sensor dedicated to the CSI is correct then, in which case I can just bolt on the 3.4 LIM and let the connector hang or swap the 3.4 one?(not sure if I still have it lying around or not) would sure be nice to get one less un needed thing out of the engine bay, I'm a minimalist, the less clutter and crap in the way the better, I'm already ecstatic not having to deal with a pita dis, thats impossibly hard to tighten down without breaking your hand and can barely be turned for timing adjustment cause the plugs hits the firewall, and ofc my jerry rigged CSI injector with a bolt in it can be omitted, sounds like I just have to sort out the tbody and the ECM/DIS now. 3.4 intake/tbody deals with IAC differently, ideally I plan to just play mix 'n match till I figure out something that works between my 2.8, 3.4, and 3400 tbody...Need to get that throttle shaft out though...but not sure how

Maverick H1L

iTrader: (8)

More than likely, you can completely delete the CSI altogether as there probably isn't a provision for it in the back of the intake manifold as there was on the 3.1 (it's plugged but it's there).

Why do you need to remove the throttle shaft from any of the throttle bodies? Just get the right wiring... The wire colors are the same, just connect the new stuff to the existing harness.

Project 3.4 Camaro

I know that I can get rid of the CSI, thats the jist of what I was saying, as for the throttle body, numerous reasons, I would like to use the 3.4 body and sensors but port it out to 56mm to put the 3400 plate in it if I can, or at least figure out a setup that would work using one of the other throttle bodies, my TPS is jerry rigged and its been bugging me a while, the GD torx bits broke, then the extractors broke inside the torx bits..........

Project 3.4 Camaro

As a small update, I decided to just grind off the bit on the 3.4 intake manifold on the TB flange where the 3.4 tb dumps the IAC air against that backplate, sending it through the TB mouth of the plenum so that my 2.8 TB can bolt up, also noticed something interesting, the plenum to TB port matching is horrendous, at first I thought the 2.8 TB just wasn't lining up quite right, but then I checked the 3.4 TB against the 3.4 intake and the 2.8 TB against its intake, both have a sizeable bit of extra metal at the top of the mouth blocking flow of the TB, and what really sucks is my dremel just conked out on me....

Also believe I figured out my valve lash issue, my lifters were pretty damn flat, I was able to push the plungers down with my bare hands on at least 6 of them, was thinking they might have gone flat from the car sitting, but the mechanic I take my car to for the crap I can't do myself said it hadn't sat long enough and that it must be low oil pressure, and he was right about my having a vacuum leak before. Plus it makes sense, I'm just hoping that a bad gasket at the filter housing unit can cause low oil pressure and that its not a bad pump or bearings. Cause I know my gasket is bad, and is certainly a helluva lot cheaper to replace than the alternatives.