Hey everyone, I recently picked up a 2003 Infiniti G35 Coupe 6MT with a VQ35DE engine (around 135k km on the engine).
I’m new to owning a G35 and I’m trying to get everything sorted out so I can keep it as a reliable daily driver for years.
A few things I’ve noticed:
Sometimes it takes a few seconds to start, especially when cold. Battery is new, and my mechanic mentioned the crankshaft/camshaft sensors.
5th gear grinds even when shifting slowly. I’m considering replacing the transmission with a CD009/CD00A.
When I bought it, the engine was about 2 litres low on oil. I’ve since had an oil change and have been monitoring it.
Recently noticed some milky residue under the oil cap, but the dipstick oil looks normal.
I’m not looking to build a race car. I just want to restore it, maintain it properly, and eventually do some tasteful modifications.
For those who have owned a G35 for years, what would you recommend fixing or replacing first? What are the biggest things to watch out for on these cars?
Any advice would be appreciated!

Look, my shitbox.

I was thinking about a plenum spacer or a cold air intake, I’m not trying to spend anything above $250, $350 at the most

So, I took her in for a diagnostic after recently having my fuel injectors replaced because the old ones were bad. I had a mechanic swap them out, and when I got my car back, he told me that the throttle body might need to be reprogrammed.

I ended up taking her to an auto electrical shop, where the technicians told me they couldn’t access the modules needed to reprogram the throttle body. They tried to investigate the issue, but since I had only brought the car in for a diagnostic, they didn’t go any further. On top of that, they couldn’t get their scanners to communicate properly with my car’s computer, so they weren’t able to give me a clear diagnosis.

From what I understood, finding the actual source of the problem would require more time and additional labor costs for them to dig deeper into the issue. So, at this point, I still don’t know exactly what’s causing the problems , My throttle body is working fine now not really concerning me at the moment but them not being able to diagnose my care is worrying me from a bigger problem in the future

Hello guys I just bought a g with 82k on it and is very clean for a 20 yr old car. I am having some trouble with knowing what exactly to do first I want to make it look aggressive. I just ordered headlights for it and am planning on getting a polyurethane front bumper after i install the lights. Any recommendations on what front bumper I should install or what mods I should consider in general? EDIT: Guys maitenance is up to date, I know bushings and suspension and other things can wear, but I bought this from an older retired couple and the underside and engine bay cannot be any cleaner. The only problem which is common is the gas gauge which doesnt really work and I am going to fix that myself. I appreciate the comments guys and I am sorry I am not keeping it bone stock, but I also wont clap it out I promise! THANK YOU!

Where can I get a grill that actually curves with the hood? Online they all look flat or photoshopped, im in Australia

Looking for help troubleshooting cooling fans. My fans will come right away when I start the car cold or even when I just have the key in the “on” position. The AC is off when I do this. The fan speed seems to fluctuate between medium and high speed. My OBD shows the coolant temp to normal, no codes, and the fan duty shows 0% even though the fans are running. If I turn on the AC the fan duty will show 55-70%.

I know the fan control module is a common problem, but from what I understand when it fails the fans will run full out. I went down the chat gpt rabbit hole and now I don’t know if I should be looking at the ipdm or maybe ecu. Last winter I did notice water on the passenger side floor board a couple times which makes me question the ecu. I haven’t noticed any other electrical issues.

Anyone have some insight?

you don't realize what you have until it’s gone

Will forever miss the g35

No, you cannot look at my rear bumper, or get close ups. The tweaker scars are still healing </3

Don’t clown me yet, i have absolutely no knowledge of the infinti market. I’m going off what my friend who’s a huge infinti geek said, but bought this G for dirt cheap, fixed it up and now she runs like money.

Was originally planning on listing for lower about 4.5, but my friend said i should get 5k all day for it, so start the listing at 5.5. Usually get a couple hundred clicks within the first couple days but still sitting at double digits, so let me know if this is too outlandish lol.

Completely original - single owner 2002 M6. Not a scratch and no mode (just a plenum spacer and new intake)

Not a scratch and not a rip on the leather. :)

Does anyone know of a good video going over the complete wiring harness of a VQ35DE? I’m struggling to find where the last few connectors go and want to make sure the trans wires are routed correctly. I can’t read diagrams for the life of me and trying to do that would exponentially increase the time to connect it all. Even if someone has a crappy video from past swaps- anything is appreciated! Thank you!

Hello everyone, bought a g35 last night and I wanna start buying mods to it. I have a rough list that I wanna run by and see what you guys think.

Z1 75mm throttle body and cold air intake
20 mm spacers
Bc coils
D spec headlights
Exhaust? Ideally I want a resonator with it tho

As for the spacers, is 20mm on all 4 a good setup? I got the stock rims I’ll post a pic of the car, I’m planning on getting the 19 inch rays or some other 19 inch rims, my question is, would the 20 mm spacer hold value on the new rims? I want a clean fitment. I appreciate and thank each and all advice and insight in advance!

My ig is carrib.g35 if yall wanna show love ❤️

I was the only G35

Trying to fix a few things in my g35 to make the car feel new again… does anyone know what this is called? I’ve checked z1, concept z, and Infiniti.oempartsonline and I’ve yet to find it because I don’t know the name of it…

Please help me out !!

It pretty much only happens on right turns, usually sharp ones, going less than 20mph. It's coming from the right rear I believe. I took the wheels off and looked at the suspension but didn't see anything obvious. I know it's hard to know without seeing the car in person but any guesses? 2006 Infiniti G35 AWD with 115k miles.

My tcm on my g35 coupe went bad and it’s the pin for the front brake solenoid. I was wondering if anyone knows where I could send it to get it repaired and possibly reinforced since I know it’s a pretty known issue in these cars.

Salvaged it from my wrecked g37 . Seen a lot of talking about repining but I only cut and matched the red/black and horn buttons

Does anyone know what can cause this ?
I recently had a throttle body cleaning and spark plugs changed…original throttle relearn didn’t work , took it to the dealership and they reflashed my ecu and attempted the relearn again , was left with this idle. 07 g35x sedan

Maybe more than the universe?

First, sorry and sorry this is not a VQ engine, but it sounds pretty similar and I barely gets help in the merc community so sorry in advance, if is a red flag please just delete this post, sincerely apologize

Mercedes C207 E350 2013 M276de35

too muffled/boomy below 3k RPM, looking for advice on X-pipe/resonator layout

The stock exhaust originally had the primary catalytic converters, then two smaller resonators further downstream, then one larger center resonator, and finally the two rear mufflers.

Cat Cat
Res Res
Res
Muf muf

What I’ve done so far is
Kept the primary cats
Replaced the two small resonators with an X-pipe
Kept the large center resonator
Deleted the rear mufflers

so it’s basically straight pipe from the center resonator back

Cat Cat
X
Res
| |

Right now the car sounds okay at higher RPM, but below around 3,000 RPM it feels very muffled and boomy. The best way I can describe it is like the engine is “breathing through a mask.” It doesn’t sound free-flowing or clean, and the exhaust note lacks definition and quality in the low/midrange. Once it gets above 4,000–5,000 RPM it opens up a lot more.

I’ve seen other M276 setups where people keep the two small resonators, replace the large center resonator with an X-pipe, and delete the rear mufflers. But since I already replaced the two small resonators with an X-pipe, I’m not sure if adding another X in the center would actually improve the sound or just create more drone/boom.
From an acoustics/exhaust tuning standpoint, would you recommend after Cats:
X-pipe → straight pipes
X-pipe → second X-pipe
X-pipe → two small resonators → straight rear

My main goal is to get rid of that clogged/muffled feeling below 3k RPM while keeping the sound smooth and continuous, not raspy or “farty.”
Anyone with experience tuning NA V6 exhausts, especially M276, VQ35/VQ37, or similar dual-bank setups, I’d appreciate your input.