Hope you have some experience with rebuilding engines, these engines have some really unique things that you have to get done right or you will end up with an expensive mess on your hands. Along with the head bolts mentioned previously, I would stick with Nissan bits and pieces for the rebuild. You will end up spending a bit more but you will also end up with fewer issues. After my last one, I swore up and down never again, but I probably will at some point.

 

I assume the timing chain kit is the same between the revup and none revup engine? and what about the oil pump?

thanks!!

 

The rev-up used a different oil pump, chain and the rest of those wearable timing cover components are the same except the exhaust cam gears and cover (which you will probably re-use), don't get those mismatched keep the driver side gear+cover together and same with the passenger side one, they are a mated pair and not to be interchanged with one another.

If you haven't already I strongly suggest reading the FSM and doing some extra-curricular homework about the assembly for this motor it has a few extra pieces that you might not be familliar with if you haven't worked on twin variable cam timing motors before.

 

Sorry I have to skip I found a donor motor but it's a automatic I assume it ok since I'm using the block?

 

I'm posting this here cause it show the history of what I got done to this car..

last year I (I got a shop to rebuilt it) rebuilt my rev up engine with a bottom up from a none rev up car. Took the head and place on top of the none damage bottom end... Took all the right parts to rebuilt it.
I let the car sit over winter... Car ran fine be fore it sat. Start the car up drove it for a couple of days. and it over heated...replace water pump thermostate, temp sensor, and the rad. It still is over heating...
What did I miss. Thanks

 

Pressure test the coolant system, verify both fans turn on. You can force them to high speed by turning on your air conditioner.

Get a good flashlight and look between the radiator and condenser to make sure mice didn't build a giant nest and block airflow.

 

I replaced the rad already no mice. both fans turn on... I will tell the shop to burp the system again..
This is very frustrating. Thanks again for you help. I hope it has nothing to do with the engine rebuild?

 

Leakdown test and compression test, with the radiator cap off. Those will tell you if it had anything to do with the rebuild, if you have bubbles coming out of the radiator cap then something (headgasket) didn't seal or is broken.

The VQ is picky about properly adding coolant and many shops are accustomed to just dumping in a bunch of coolant and starting the engine. That's NOT going to work with a VQ35DE however because it traps a LOT of air so you must add the coolant slowly and follow the procedure set forth in the factory service manual. Or use a Lisle funnel which removes a lot of headache since it allows a much larger volume of coolant to sit on the system and the head pressure helps work coolant past the trapped air.

 

New here but in need of guidance I have a 2005 3.5 that had a rev in it but the owner I purchased it from tried to swap it for a non rev from a 2003 what I'm dealing with is the obd is saying no communication with ecm he did the swap using the donor harness and ecm but it won't start or recognize the keyfob and I called out a locksmith they told me the key can't be programed because of the communication issue do I need a new ecm or am I just screwed at this point all I was told in the beginning was the key needed programming but obviously there's more to it

 

ECM and BCM are a mated pair, gotta swap both or have the dealership mate the pair using Consult II/III.

Or you can use Nissan Datascan2 to mate the pair, use a BCM decoder online to get the pin number for the BCM.

NDS2 Windows version, not the android version.

Mated ECM/BCM is part of Nissans anti-theft stuff.

 

One more thing on the communication issue I'm having I just saw there's a difference in the ipdm from 03 to 05 I'm guessing using the 03 engine and hardware I should also use an 03 ipdm as well?

 

@Amaru , hold on a sec. The answer is in the schematics (I recently went through this exercise).
Go to nicoclub.com, go to service manuals, and find your model and the model of your donor.



For now, here's a quick shortcut:





See the problem?
Your 2005 G35 is expecting to talk to the ECM on pin 85 of the ECM harness, but pin 85 of your 2003 ECM/harness is for the cam position sensor. No wonder you can't get any data from your DLC!
But wait, there's more. (It gets worse.) Look at pins 94 and 86 of the 2005 schematic - that's the CAN bus (Controller Area Network. Think of it like TCP/IP, but for car components). So your car is looking for CAN bus traffic on those pins, but what is it actually connecting to on your 2003 ECM? Take a look... coincidently, 94 also goes to the cam position sensor, and I don't even see 86 on the 2003 ECU, so it's N/C (No Connection [not used]). Your 2003 ECM isn't even talking to your BCM because its CAN bus connection is on the wrong pins. And it continues to get worse - look at all the differences in the pinouts of these 2 ECMs. It's apples and oranges.

This will not work. And unless you have a good soldering iron and a WHOOOOLLLE lotta patience, it can't work.

Here's what you need to do...
Find a non-rev 6MT ECM whose pinouts are the same for a 2005 G35. Off the top of my head, I know a 2005 350z ECM will work (I literally just did it myself a few weeks ago. See https://g35driver.com/forums/engine-...-how-went.html)
Use a harness that matches the ECM. Your original 2005 rev-up harness will do just fine. You just leave the exhaust cam VCT actuator/sensor connectors dangling. And the leave the oil temp sensor connector dangling. The pins for those connectors are N/C for a non-rev ECM.
Since you have an 03 engine, it will have the narrowband O2 sensors (on the left). ECM's that are pin-compatible with your 2005 use the widebands (on the right). So swap your narrowbands for widebands. Your 2005 harness will not connect to the narrowbands anyway.


In the post I referenced above, there is a PDF attached. That PDF contains a matrix of nissan/infiniti ECM part numbers that are out there. Make sure whatever ECM you get has the correct part number on it. DO NOT TRUST ebay descriptions. Only trust part numbers.

So in summary, ditch that 2003 ECM and harness and get one that's pin-compatible. Look at the FSMs for different non-rev models and note which ones are pin-compatible. There are several. I recommend something from the 2005 350z area. Keep it as contemporary with yours as possible. I ended up using an ECM from an 05 350z roadster. Works great.

Good luck.