97 Monte Carlo 3.4 into a 95 Grand Prix

[swalsh19]

My 1995 3.4 in my GTP recently broke. I have found a 97 Monte Carlo 3.4 and would like to swap that in.

I realize this is not a straight forward pull one motor out and pop the other in for replacement.

Does anyone have any helpful tips for me for this job?

[SappySE107]

um, don't break anything? At least you can retain the MAF and SFI off the 97 motor. The exhaust might be different for the downpipe so check that out.

[swalsh19]

Looking at the 97 motor, the plenum is the only thing that appears to be different. Everything else pretty much looks the same. I haven't yet removed them to see if they're interchangeable, but hopefully they are, they don't really look too much different. Spark plugs are in same location. I figure it will be just easier to use my 95 plenum and MAF as I know it is complete, the 97 I'm not sure about.

Minor things like where the coil pack is on the 97 and the 95 differ but I figure I can use them all off my 95 motor.

I would appreciate any help that anyone can give me for this.

Thanks in advance!
Steve

[SappySE107]

You will have to swap the lower intake as well, and the fuel rail. I would use the 97 manifolds. The heads are different but that only affects the exhaust manifolds, that are different. I would keep the coil packs on top if you can, since that is a better place for them anyway (away from the exhaust manifold).

[swalsh19]

I'm told I should try to reuse everything from the 97 and not transfer anything from my 95. If I was to do this what modifications would I need to do in my 95 so I can use all the 97 stuff. All the wiring to the intake is there it was just cut off. So thats why I thought I would just transfer my 95 stuff.

[swalsh19]

WIll the 95 plenum work on the 97 motor? Reason being is I know the 95 is complete but the 97 I'm not 100% sure. Also I'm not sure where the extra wires go as the 95 only has two spots for wires where the 97 has more. SO I thought to be safe i would use the 95 setup. I don't really care that the 97 is better, I just want something that works.

[dohcfiend]

no matter which way you go, the egr is going to give you problems. easiest way around that is block it off and have a chip made to get rid of the ses light.

if you are looking for simplicity, then put your 91-95 intake manifold and plenum on your 96-97 engine. the intakes ports are the same.

other than the egr, there is the evap. in which case, you just remove the pipes and plug the holes.

or if you like, i have a ported set of 96-97 exhaust manifolds with everything blocked off and removed correctly for $75 plus shipping.

if you have access to your old engine, you need to switch the heater hose inlet on your waterpump. it is easy, just remove it on your old engine and switch it on your new engine. it removes just by sticking a 3/8 extension into that square hole.

it has been a while but that is all i can think of for now, unless you want to use your 96-97 intake manifolds then a few wiring changes need to be made but still a cakewalk if u can solder.

[swalsh19]

no matter which way you go, the egr is going to give you problems. easiest way around that is block it off and have a chip made to get rid of the ses light.

So are you saying I can't just transfer my EGR to this motor? I'm unclear by what you mean block it off and have a chip made...

if you like, i have a ported set of 96-97 exhaust manifolds with everything blocked off and removed correctly for $75 plus shipping.

Can I see a pic of this?

[dohcfiend]

the 2 engines use 2 different style egr valves plus the way they bolt to the manifolds are different. the 91-95 egr pipe uses a 1 bolt flange that goes intot he exhaust manifold where the 96-97 egr pipe has a large threaded end that screws int the manifold.

the only way to really make the egr work is to make an adapter. i used to have one but sold it. it is far cheaper and easier just to block it off and delete it in the computer. to block it off, you use a block off plate for your intake and a threaded plug for your 96-97 exhaust manifold.

there is one guy that will modify your 94-95 chip/memcal, b/c if you do not you will get a SES or Service Engine Soon light all the time. he is called darthfiero and is located on a few fiero boards or just go to gmtuners.com.(he can also set you up for a 160 or 180 stat and remove that pesky 117mph governor )

here is a pic, you can see one of the evap plugs on the bottom. this is the best time for a PEM or ported exhaust manifold and for the price, it is a wise choice. also i can supply a crosspipe at no extra cost if you need one.

[swalsh19]

So if I got the computer re-programmed, is the EGR then needed? Or what would I do?

Also what is the purpose of the evap plug?

[swalsh19]

Ok, if I eliminate the EGR from the computer will my car and block it off like you suggest will my car pass an Emission Test? Without the EGR working the car won't will it?

[dohcfiend]

i guess it depends on your emission laws on whether or not you'll pass inspection. that little bit of research you'll have to do yourself.

the purpose of the evap plugs are to get rid of it. in case you haven't noticed your stock 95 engine does not have evap on it.

also as i said earlier, if this stuff get's blocked off with a stock chip it will illuminate that annoying orange light marked Service Engine Soon, b/c your computer has detected your egr is not working correctly.

when you get the chip modified, that annoying orange light should be de-luminated.

[swalsh19]

I'm going to try and mod the EGR piping first. Hopefully that will work, as we have to do emission checks every other year.

Worst came to worst I have to remove the EGR and I only drive the car for 1.5yrs more.