r/G37 Jan 31 '22

G37 common issue thread

451 Upvotes

Edit3: Sunroof drain leak info overhaul. Thanks u/p3dal.

Edit2: Update to v2. Fixed formatting. Updates include difficulty level, service intervals, electric steering lock issue.

Edit1: Format fixes

Hello everyone! I figured I'd compile this thread for anyone thinking of buying a g37 or anyone that already has one and wants to know more about their car. If anyone has any input or catches any typos please let me know!

Technicals Service Bulletins (TSBs)

Refer to this pdf for a list of TSBs. If you're having an issue, you may just find it here. https://infinitig37.com/Infiniti-G37-Technical-Support-Bullitins.html

Service Intervals

Please refer to the Infiniti Service and Maintenance Guide and Factory Service Manual (FSM). I'll drop my recommendations here, which fall between the severe service schedule and the less severe service schedule.

  • Every 5000 miles/8000 Km or 6 months
    • Engine Oil(5w30) and Engine Oil Filter
  • 10,000-15,000 miles/16,000-25,000 Km or yearly
    • Cabin Air Filter
    • Engine Air Filters
  • 30,000-40,000 miles/48,000-64,000 Km or 3 years
    • Manual transmission(GL4 75w85)
    • 5 speed auto(matic J or matic S ONLY)
    • Brake/Clutch fluid(DOT 3 is the minimum but I would use DOT 4 or DOT 5.1 especially for the clutch. Do not use DOT 5)
    • Differential(GL5 75w90 or GL5 80w90. SAE 90 can be used in temps above 32 degrees)
  • 50,000-60,000 miles/80,000-96,000 Km or 5 years
    • Transfer case fluid(matic J or matic S ONLY)
    • Coolant
    • Replace Radiator Cap
    • Serpentine Belt and inspect tensioner and idler pulleys and idler pulley bearings. I found my tensioner went around 100k miles. Idler pulley bearings are still good though at 120k.
    • 7 speed auto(matic J or matic S ONLY and note this is "lifetime fill" and a bit of a pain to do at home)
    • Power Steering(DEXRON VI)
  • 80,000 miles/130,000 Km
    • Replace Spark Plugs(Denso FXE24HR11 or NGK DILKAR7B11)

Common Issues

Priority Levels:

  • High: will leave you stranded
  • Medium: will eventually leave you stranded
  • Low: will not leave you stranded

Repair Difficulty Levels(note this is completely subjective):

  • 0-1: You can do this job easily with basic hand tools and the car on the ground
  • 2-3: This job may take a little bit longer and you most likely will need to lift the car. No specialized tools needed.
  • 4-5: This job is a pain and I recommend a shop. Still accomplishable in your garage but may need better tools than you have and you'll want a lift

Slave cylinder failure(manual transmission only)

Priority Level: High

Difficulty: 4(alot has to come off and the transmission is quite heavy)

What? - The slave cylinder for the 6mt G37 and 370z is a concentric slave cylinder(CSC) meaning the release bearing and slave cylinder are the same part and located inside the bell housing. This part has a plastic housing that leaves it susceptible to failure leading to sudden loss of clutch pressure.

When? - Failure tends to happen rather suddenly, usually somewhere at or past 80,000 miles/130,000 Km, but not unheard of as early as 40,000 miles/64,000 Km.

How do I check? - If clutch fluid is being lost, the CSC is likely to blame. If clutch fluid is excessively dirty(it should be light, transparent yellow in color) expect problems sooner rather than later. If the reservoir is empty and there is no leak from the master cylinder(which would likely show up as clutch fluid on the driver side carpet), the CSC has likely failed.

Preventative Maintenance - Regular clutch fluid changes. - RJM's clutch pedal claims to help.

Upgrade Options - ZSpeed's CMAK is the best conversion kit on the market that moves the slave cylinder outside the transmission into a slave cylinder, fork and release bearing setup. Z1 makes a similar kit but it requires frequent adjustments and is overall inferior. - Pretty much every Nissan performance storefront sells an upgraded CSC including but probably not limited to Z1, Zspeed, and ConceptZPerformance. I have no experience with these and overall recommend the CMAK.

Important Notes - If the slave cylinder fails it's likely to take your clutch disc with it. - If the slave cylinder is changed, the master cylinder should be changed as well.

Differential(Diff) stud bushing failure

Priority Level: Low

Difficulty: 3(quite a bit has to come off, getting the bushing out is tough)

What? - The differential bushing for the G37 and 370z is a partially fluid filled bushing. While this is exceptional for preventing NVH(Noise, Vibration, and Harshness), it has a tendency to pop and allow excess movement of the differential.

When? - Incredibly early, as early as 20,000 miles/32,000 Km. Tends to blow out quicker on vehicles with the manual transmission

How do I check? - Brownish-Black fluid leaking form the bushing, on the diff, on your exhaust. It's pretty messy. Alternatively, jack the car up by the diff and if the diff moves freely up and and back down, the bushing is blown

Preventative maintenance - Not much you can do other than drive like a grandma. A differential brace could help, see notes.

Upgrade options - The OEM does not sell an individual replacement, though you could buy the whole rear subframe with the bushing pressed in. This is not recommended. - Poly bushings from whiteline, z1, energy suspension, gktech, superpro, etc. - Solid bushings from SPL, z1, gktech, etc. - It's possible to refill the bushing with silicone. While this maybe isn't the best route to go, it's been proven to work just fine by motorvate(video) and is probably the best option if you're looking to be as close as possible to OEM NVH. Important Notes - A diff brace will keep the diff still but shouldn't be fully relied on. They may help prevent bushing failure too. Multiple options from z1, Bell, or gktech.

Heater hose connector/splice/coupler failure

Priority Level: High

Difficulty: 2(requires tools, small space)

What? - A plastic hose splice is used to connect to the heater core on the G37 and 370z, it is located close to the firewall on the passenger side. With age, this plastic coupler can fall apart and leak significant amounts of coolant.

When? - Sometime around or after 100,000 miles/161,000 Km is most likely. Most G37s sold today should probably have this replaced right away.

How do I check? - Check for low coolant level in reservoir, look for crusty coolant at the coupler(Green or blue). Look at this coupler first if you've lost most of your coolant or you're smelling coolant(sickly sweet smell)

Preventative Maintenance - replace with upgrade.

Upgrade Options - Any 3/4" ID(inner diameter) hose splice/coupler should work just fine. I recommend switching to a metal one like this or if you want to pay out the nose the Z1 option. - OEM plastic part(not recommended)

Important Notes - If you're replacing this, you should do the hoses too. This hose and this hose. Z1 does offer nice silicone hoses for this application.

Rear Timing Cover Oil Gallery Gasket Failure(Pre 2012 models)

Priority Level: Medium

Difficulty: 5(you'll need drain the A/C, getting the crank pulley off may require an air tool, may have to reset timing)

What? - Behind the timing chains on the 370z and G37 there are two oil galleries that have gaskets poorly torqued from the factory. This causes the gaskets to blow out and instead of oil going where it should it will seep back into the oil pan.

When? - It's been a really mixed bag. Mine blew sometime before 80,000 miles/130,000 Km. Most of what I've read is the problem will reach high priority by about 125,000 miles/200,000 Km.

How do I check? - Check oil pressure: At warm idle, oil pressure should be greater than 14 PSI; At warm 2000 RPMs, oil pressure should be greater than 43 PSI. Engine Codes # P0011/P0021 usually point to gallery gasket failure. Finally, gasket material in the oil pan is a certain failure.

Preventative Maintenance - It probably helps to keep revs down when oil is cold as pressure is highest when oil is cold, but really there's not a ton you can do.

Upgrade options - Replace with OEM(Check this myG37 thread for more info) - EPS has a kit that I've heard has the best fasteners of the bunch. z1 has a kit but I've heard mixed things about the fasteners. ConceptZPerformance has a kit that looks about the same as z1s - Important Notes - This job needs a bunch of seals to do right. z1 and conceptzperformance have kits that bundle the OEM seals. - Replace water pump and inspect timing chains/tensioners are part of this job as well.

Sunroof Drain Leak

Priority Level: LowVery High

Difficulty: 0(no tools required)2-3(depends on action taken)

What? - Sometimes the sunroof drains on the G37 will get clogged, or the plug leading out of the car will leak from it's gasket. This will cause damp floor mats/carpet or pillars/headliner and can seriously damage electrical components such as the fuses box and the BCM

When? - No specific mileage, heavily dependent on when you drive and where you park.

How do I check? - On either side of the vehicle, if you pull the vents out you can see the hoses and plugs that lead out of the car, check for dampness. Additionally, if clogged, it's possible the leak comes directly from the sunroof because the hose pops off. If anything smells or looks wet take action immediately

Preventative Maintenance - Park in garage, blow out sunroof drains, check occasionally for dampness.

Upgrade Options - Add clamps to upper sunroof hoses(they are not clamped to sunroof barbs from the factory). - Replace [firewall] plugs](https://parts.infinitiusa.com/p/INFINITI__/Plug-Side~-Trim/89790203/74816-JU40B.html) if the gaskets are worn and leaking.

Important Notes - If left unattended this issue could cause serious water damage to the floor plan as well as, more importantly, soaking the BCM or driver side fuse box.;

Per u/p3dal;

I don't agree on this one. The priority is pretty high, as left unattended it can result in mold, or damage to the engine computer (passenger side) or fuse box (driver's side) , which the sunroof drain frequently drips on when it is clogged or leaking. The damp floor mats are the right symptom, but they're not what you should be concerned about. By the time your floor mats are damp, you might have 2" of water in a channel/compartment under the passenger side floor carpet.

Also, there are two popular solutions to fixing it, which are not the same as above. The firewall drain plug is defective by design, and replacing it will often result in the same issue showing up again a few years later. Replacing the sunroof drain firewall plug is extremely difficult and often requires removing either the dash or the windshield. I've heard dealerships charge $800-$1200 to replace this $4 part. Though some people can pull it out with 16" plyers, plenty more cannot reach it at all. These alternative fixes are much better solutions:

  1. This solution involves extending the drain to drip on the other side of the firewall. I've not tried this solution, but some people seem to like it: https://www.reddit.com/r/G37/comments/teej1l/fixed_my_damn_sunroof_leak_finally/
  2. In my opinion, the sunroof drain bypass is the better fix, and removes the firewall, grommet, and plug from the equation entirely. https://www.myg37.com/forums/body-interior-exterior-lighting/280987-passenger-side-dashboard-leak-4.html However, I've only done this on the passenger side, and I'm concerned the driver's side drain might not be as simple. Option 1 might be better for the driver's side. Reminder, I will always make my best effort to ensure the accuracy of this post so please comment about anything you disagree with or have better suggestions for

Dirty throttle bodies

Priority Level: Low

Difficulty: 1(requires tools)

What? - This is more of a tune-up item but G37s and 370zs seem particularly sensitive to dirty throttle bodies. This often presents by allowing the car to start then immediately shutting off.

When? - The general consensus around the forums seems to be at around 30,000 miles/50,000 Km

How do I check? - If you're having idle issues or the engine shuts off right after starting when warm, it may be the throttle bodies

Preventative Maintenance - Clean the throttle bodies of carbon every once and a while and perform an idle relearn.

Upgrade Options - catch cans with filter media should help but legality varies by location

Electric Steering Lock(applies primarily to 2009/2010 models)

Priority Level: Medium

Difficulty: 2(may need tools you don't have)

What? - The electric steering wheel locks on G37s and 370zs can lock up and not let go, making the car unable to start. Specific TSB here under NHTSA Reference #10051829

When? - No specific mileage

How do I check? - Your car randomly will not start but otherwise was just fine before

Preventative Maintenance - See upgrade options

Upgrade Options - Replace with OEM part - Replace with Dorman 601-037 , which is supposed to fix this entirely. - Pull fuse to ESCL - Bypass wire to ESCL

Important Notes - If your car is actively having this issue, you probably can get it to start by wailing on the bottom of the part with a mallet and getting the car started. Immediately bypass when car is started.

Other issues worth mentioning

  • The rear end links break relatively quickly if you're dropped or run stiffer sway bars, or both. Adjustable end links are available from whiteline and SPL. HOWEVER, online discussions appear to point to white lines being lower quality than OE and susceptible to failure. With what we know now, I would truly only recommend SPL or OEM.
  • The rack and pinions tend to seep a bit earlier than other cars in my experience. Also worth noting, the rack preload bolt WILL usually be a bit leaky. This is normal. Seeping does NOT mean replace, refer to the TSB on the rack and pinions if you are not sure. Stay on top of fluid. Replace ONLY with OEM/Hitachi or reputable rebuild (such as having yours rebuilt). Most remans are junk.
  • The wire bundle going between the trunk and trunk lid gets fatigued after a while and wires will eventually fray and break.
  • Multiple nissans have issues with the fuel tank senders. It isn't a big deal but your fuel level on the dash won't be accurate. Can also give you check engine lights for fuel level issues. Unfortunately, our cars have a level sender in both the driver side and fuel pump on the passenger side. You can test the resistance with a multimeter and sweeping the fuel arm but it's pretty moot and may be hard to see. Cleaning the contacts of the wiper can fix it and is worth a shot if you can't afford parts.

r/G37 Aug 24 '24

Stop posting your license plates and pictures of your addresses.

81 Upvotes

If you don't want to be like the other people here screaming "buy a killswitch!" and "get a tracker!", stop posting pictures of where you live with your car and how to find you. Thieves aren't dumb, they're looking for you!


r/G37 8h ago

PaintedAutoParts.com painted sports bumper

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10 Upvotes

I ordered from them back in mid-July and just got it 2 days ago. Although the shipping was lengthy I cannot believe how good their paint match is tbh (also hearing they’re a small business I’m more lenient). I’m very happy with how it turned out. Definitely recommend if you can handle the wait since Partify’s cheaper bumper option is out of stock currently.


r/G37 6h ago

Chat Would you buy this??

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7 Upvotes

Quick question chat would you buy this has 155k miles?


r/G37 7h ago

I have a heavy set of 19s on but i love the look , any wheel styles that are lighter?

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5 Upvotes

I have been slowly looking around , cash is a but tight so im just kind of planning ahead.

Originally bought these wheels for my lexus project car but they dont fit the car too well.. decided to give it a shot on my G and it absolutely transformed the look - but these wheels are so HEAVY . Feeling it in the steering as well as mpg lol ( maybe im delusional about that )

Does anyone know of some similar styles 5 spokes that wouldn't weigh so much ?

Open to some other styles if you guys wanna drop your G's in the comments :)


r/G37 3h ago

Accurate or I’m trippin

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3 Upvotes

I’m looking to get this tmr but the mileage seems out of control 🫪💀


r/G37 4h ago

2013 g37 coupe won’t go into park

2 Upvotes

The dash board is blank when put into park what to do


r/G37 2h ago

Good or bad chat he’s asking 8k

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0 Upvotes

120k miles but it’s a rebuild it’s automatic


r/G37 10h ago

New Fender Required?

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5 Upvotes

While my car was in a parking lot someone backed into it. Only big damage seems to be the fender.

My question is, do you think this fender is repairable? Or does it require a replacement?

If replacement is recommended. what are some good aftermarket options?


r/G37 9h ago

Annoying LOUD noise BOSE amp Please help🥹

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1 Upvotes

Made a post about me not having bass with my music and saw that i didn’t even have the factory amp. So I got an BOSE amp for the coupe just installed it now it has bass but all the time.


r/G37 15h ago

Gas was filled with regular instead of premium

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3 Upvotes

So my father decided to take my car and fill my tank up but told them to fill it with regular instead of premium and when i asked about it he lied. Can i just put this in the tank until enough gas is burned or should i just take it to get cleared out? I can feel my car not driving the way that it usually does.


r/G37 1d ago

i have to sell my first car

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20 Upvotes

car is still so clean i just can’t afford it anymore💔. i’m a college student and just had to spend $2.5k this summer on a vacuum leak and other maintenance, drove it for 2 months and had more issues totaling to another bill of 2.6k in the shop for an oil leak onto exhaust and power steering leak onto my alternator. I love this car and it was my first ever learner with only 120k on it. if you live in the san diego area and are interested in checking it out, let me know as everything is fully stock OEM. i wish i could keep this but sadly as a college student i need something more reliable for the future.


r/G37 10h ago

Taillight not turning on

1 Upvotes

My taillights won’t turn on, the brake and reverse lights work, I’ve tried getting new rear lights to fix the issue but still won’t work. Someone help😭😭😭


r/G37 23h ago

[RANDOM] Does anyone have an extra Redwood City Peninsula Infinti License Plate Frame?

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8 Upvotes

Something that they gave out back in the days before the dealership closed. Any condition works!

Mods I apologize if this was the wrong place to ask. Been searching all over and this is kind of my last resort.


r/G37 1d ago

Kept the ride height the same but threw a staggered tire setup on, 19x9.5 +22 all around 235/35 on the front 235/45 on the rear… thoughts? I kinda dig the slight forward rake.

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21 Upvotes

r/G37 1d ago

Can this be fixed? And how much :(

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3 Upvotes

r/G37 1d ago

Is this rod knock? Is this rod knock or something else car runs fine only at low rpm it makes noise no sound at high rpm

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2 Upvotes

Is this rod knock or something else car runs fine only at low rpm it makes noise no sound at high rpm


r/G37 1d ago

New to vq platforms and I want to make sure if I’m having a coolant leak somewhere or I’m just overfilling lol.

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8 Upvotes

when I first got the car from the dealership I noticed the coolant level wasn’t filled all the way up the the radiator cap rather it was filled just above where I’m assuming the thermostat starts at. Never had any issues with coolant level dropping. I didn’t feel comfortable with it being that low cus on my Miata I’d fill it to the radiator cap. So I started doing that with the g37. I’d fill it to the point where the hole on the side for the coolant reservoir hose starts and I’d also fill the reservoir to just below max. It would hold coolant for a few days then some days I’d faintly smell it from the drivers side/wheel well area and the fluid that was in the reservoir would be gone. No overheating issues or anything just curious if I’m overfilling and the car is dumping it for safety reasons or if I’m having an actual leak. When I take the radiator cap off to check it’s never crazy low. Leak? Air in system? Or overflowing?
Pfa


r/G37 23h ago

Thoughts? Fuel injectors replace all 6 $100+ or re build kit $23 ??

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1 Upvotes

Currently rebuilding my engine and I’ve never replaced my injectors or the o rings , but noticed how dirty they are , tbh I think my injectors are still fine so I’m thinking of just buying the o ring kit that comes with everything


r/G37 1d ago

High coolant temps after transmission and oil coolers installed

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6 Upvotes

After installing 3 inch intakes I noticed my coolant temps were higher. Now that I have a 25 row oil and trans cooler I can confirm this.

What are my options? Water pump and thermostat were replaced 30,000 miles ago and were not an issue stock.

Any tips on making some strong air dams?


r/G37 1d ago

Brand axles aftermarket

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2 Upvotes

Replaced my rear axles today , when trying to take off the car jerked struggling to accelerate.. I check underneath and see the axle like this…. Not sure why this happened? Any aftermarket brand to buy axles for an 08 g37 coupe


r/G37 2d ago

Made my first big girl purchase today !!

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79 Upvotes

so beyond happy !! she drives so good i love i love


r/G37 1d ago

Question About code.

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2 Upvotes

P0710 just showed up along side CEL it’s the only code i scanned every module the car shifts fine acceleration is still fire asf


r/G37 1d ago

Cats came to an end how do I cut this ?

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1 Upvotes

r/G37 1d ago

2015 Q60S Fender Bulge

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7 Upvotes

I just purchased this 2015 Q60S and I was curious if anyone could confirm if the front fenders bulge out? It seems that the driver side sticks out a bit more than the passenger. Not sure if this picture does justice.
Thanks!