I could really use a little help with my swap. I have a 3400 out of a 00 grand am going into a 1997 LN2 (w/ th125) cavalier. I have the entire engine harness from the 00 grand am. What do you think will be my best bet as far as wiring? Would it be easier to use an entire grand am wiring harness w/ cluster? I'm no stranger to fiberglasss and wouldn't mind modding the dash for it to fit. But is there an easier way? Something I'm not thinking about? I will be buyin HPT w/ my rebate check in April, so it's not a big deal to tune it. Any help you could offer would be greatly appreciated as I'm kinda at a standstill until I figure out which direction I'm gonna go with the wiring.




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depends

if you have to go through emissions, you have to do OBD2

If not, standalone works too.

If I had to do it again, I'd go standalone, but since the emissions laws in my area is uncertain, best to be safe than sorry.

If you have the money to go standalone lol... Im perfectly satisfied with using the 2.2 harness and mating it to the 3400 harness. Thanks to you (Kardain) and others for all the help.

My car runs great. I have no complaints with it at all.


3400 SWAP DONE. 187WHP 212TQ (NA) 240WHP 310TQ (N2O)

In my case, the standalone was actually less expensive than buying HPTuners.

Also, if you're using a Megasquirt or other standalone like I am, you can use your 3spd transmission since it's not electronically controlled. With the Grand Am harness you'll have to use a 4spd transmission, or have HPTuners (or know someone with it and pay for credits most likely) and delete the auto tranny codes.

I do have emissions here in the dfw area. So, I need to keep the obd2 operational.


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Quicklilcav suggested using the 2000 Regal 3100 entire harness w/ cluster. What do you think about that?


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im shure your all tired of awnsering the same old questions but i got a 99 z24 5spd and want to do a 3400 swap wat would be the best parts to make the swap as easy as possible. i read someone used a upper mouter mount from a 94-97 grand am harness and ecu from a 94-95 camaro/ firebird and custom dog bone i know i will need alot more other parts but would these parts allow me to retain my gauges. i have the skills to splice the harnesses but want to do as little cutting as posible any advice would be appreachated

Ray, my first suggestion would be to read the entire sticky. If you have read that, and are not sure which ECM is best for you, I would suggest a 99+ GA ECM/harness. Your 99 Z is OBD II, so the 94-95 F-body (Camaro) ECM would not be your best bet. I chose that because I have a 95, which is not OBD II, so it seemed to make more sense at the time.

As far as the mounts, the advantage to the 99+ GA/Alero mount is that it will sit right on the frame rail of the J-body. The advantages of the 94-98 GA mount are that you do not have to do any modification to the J-body frame mount, and you can also use the eurethane inserts for a more solid mounting with less engine movement. However, they both have aspects of fabrication or modification to work.

I don't want to start a war or nothing, but IMO, you are better off with a DOHC swap rather than a six.
3400, and 3100 are prone to lower intake gasket failure, and furthermore, a four with mods in our platform makes more power.
By the time you get a V6 in there, and get it working, you could supercharge an eco with GMPP for comparable money with less work (assuming you did not get the V6 for free).
On the other hand, nothin wrong with it at all, depends on what you are going for.
My goal is power without problems, or less problems.

Thant for the advise ive heard the problems with 3.4 before but my moter is non Eco and way would b cooler than a 6 cylinder cavalier

03ecols 5 spd wrote:I don't want to start a war or nothing, but IMO, you are better off with a DOHC swap rather than a six.
3400, and 3100 are prone to lower intake gasket failure, and furthermore, a four with mods in our platform makes more power.
By the time you get a V6 in there, and get it working, you could supercharge an eco with GMPP for comparable money with less work (assuming you did not get the V6 for free).
On the other hand, nothin wrong with it at all, depends on what you are going for.
My goal is power without problems, or less problems.

The V6 gasket problem is just the gasket between the upper and lower manifolds. It's about a 20 minute job to swap them.

As for the price being about the same as an Eco swap with a supercharger, that's just way off base. The price to swap an Eco is about the same as swapping a V6, since the motor will run you more money, and you have to change the tranny. Now you're talking about a supercharger on top of that? Big price difference.

03ecols 5 spd wrote:I don't want to start a war or nothing, but IMO, you are better off with a DOHC swap rather than a six.
3400, and 3100 are prone to lower intake gasket failure, and furthermore, a four with mods in our platform makes more power.
By the time you get a V6 in there, and get it working, you could supercharge an eco with GMPP for comparable money with less work (assuming you did not get the V6 for free).

I fail to see how you come to that conclusion.
Intake gasket failure happens but like mentioned, it's not a difficult repair. Easily avoided by replacing them before installing the engine, and not running dexcool.
As far as money. I've got right around 1000 into my engine and standalone and mounts and all. Intake, exhaust, UDP and a good tune can put the 3400 up to pushing 190-200whp. At last I looked, the GMPP blower cost close to twice as much. Not to mention the need for the person to swap to an ECO, plus all the wiring throughout the car.

I mean, if the car already has the ECOTEC in it, it's probably best to just stick with that. But when going from something like the 2.2/2200 OHV engines to the 3400, it's really about the same amount of work in messing with the wiring and all. And you'll come up with something no more/less reliable.