So I am having major problems with my 2004 G35X engine (OC, misfire, piston rings, etc)

I found a 03-05 Coupe engine that I was told should be compatible with my car as long as I retain the oil pan from my sedan (since that is the only thing that is different)

But what about the engine harness? Will my engine harness be able to fit the coupe engine? Or will I have to get it modified etc?


I know this is a double post but I opened the other thread in the wrong section. If an admin can kindly delete that or merge it with this thread. The reason I seem impatient is because I really need the damn car fixed so I can drive like a man with cajones again. Right now I can do 50mph max on the parkway and can't punch it over 2,000RPMs. Fking senior citizens are laughing at me and flipping me the bird when they pass me. Its embarrassing...


Thanks

 

As long as the Coupe engine was also AT then you should be fine other than the fact you will need to extend the wires to the starter since a G35X starter is on the drivers side, if the coupe donor was a manual the transmission connectors will be totally different.

-Rob

 

So essentially the only engines that would a drop and drive for an '04 G35X are:
another '04 X
03-05 AT coupe/sedan

What about an AT 350z?

 

As far as the harness, without ANY modification. I believe only a late03-06 G35X would be your only option, and after more thought, a X may have sensors on the transfer case that is included in the engine harness that i'm unaware of. I've only be under an X once and didn't pay much attention to sensors.

As far as the starter being on the opposite side, the only other harness that would have the starter located on the drivers side would be an early 03 (with manual fan).

Best bet is to try to salvage your harness.

-Rob

 

Wait, so if I salvage my harness (assuming that isn't hard to do or is it?) I CAN use the other engines? Including a 03-05 MT coupe?

What about a later generation G? Like an '07? There is no way that can be used in my car without major modifications correct?

 

Yes, Your harness should work with any VQ35DE non-revup engine (as long are your swaping your upper oil pan) it will not work with an 07 sedan (since its VQ35HR) but other than that all other connections should be the same. The only difference I can think of is if you use an engine was in a Z the oil pressure sending unit (dumby light sensor) will be a 3-wire vs the G's 1 wire sensor (since the Z has a pressure gauge) but you can use the sensor from your current engine.

edit: i just realized i read your first post wrong, i thought you wanted to change harness and all from a different car.

-Rob

 

Thanks for the info Z1!

So one last question. Is there anyway to use a rev-up engine from an '06 Z for an '04 35X? Can I use it if I can find an engine harness for the rev up? Or would it require a lot of adjustments?

 

If you had the Engine, Harness and ECU it *should* work. I have never seen this successfully done, so of course I can't say without a doubt, but I see no reason why it wouldnt. You could even swap the heads/timing components from a non-revup on to that rev-up block and run it with the non-rev harness/ECU since the only difference is variable timing on the exahust on the rev-up.

Edit: problem is the rev-up harness is for a 6MT and will not work with a 5AT, I keep forgetting the AT issue, so best bet if you can only get a rev-up engine is to swap heads/timing components

-Rob

 

So I have a 2004 Infiniti g35 sedan the motor got messed up so I bought another motor from 2003 too 2006 Vq35de non revup I un wrapped motor and realized the granny has a single plug on the tranny and other motor with tranny has 3 plug on tranny. The new motor came with ecu but harness is cut can I just get the same harness and hook it all up with new ecu will that work even tho mines a 2004? I have both engines out taking parts that were cut into the new motor everything goes on with no problem but idk what else to do to get my car running can you help me please I miss my car and just want it back on the road,

 

There both non rev up Vq35de just the tranny plug is different but can I just buy the same harness that was cut and hook it up to the new ecu that new motor came with?

 

The new motor won’t hoook up to the old harness because the tranny plug has 1 plug instead of 3 plugs