G35 Coupe V35 2003 - 07 Discussion about the 1st Generation V35 G35 Coupe

03 g35 full throttle issue in lower gears

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Old 05-15-2019, 04:29 PM
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03 g35 coupe
03 g35 full throttle issue in lower gears

(2003 AUTOMATIC g35)
Hey everyone, Iím new here but I made this account because I recently ran into a problem and Idk what could be wrong. Iíve owned the car (03 auto g35 coupe) since October and it currently has 202k on the body and 150k on the motor.

(NO CEL) If I take off from a stop (full throttle almost) or if Iím at a low speed/gear then I floor it, my car bucks and I can see the RPM rev as if Iím two stepping it, and I get a really jumpy/uncomfortable acceleration. It feels like my suspensions being worn out every time it jerks. my brakes are starting to give me the warning noise as they need to be replaced soon, but I doubt that has anything to do it with it. I attached a vid so you can hear and see what my problem is. My throttle is fully depressed as this occurs.

im thinking maybe itís the throttle body/ tb sensor, or something regarding fuel (injectors/distributor/pump/spark plugs) hopefully my ECU isnít fried.

I have yet to check anything or look at anything specifically as my apartment complex doesnít allow me to work on my car, so Iím just trying to get ideas, in case any of you have had the same issue, beforehand so that I donít start messing things up trying to fix it.


(also just edited this in I noticed it happens around 3-5k RPM in first gear, or while downshifting from second into first, AND RECENTLY I discovered it happens in high rpm second gear also, so Iím assuming itís maybe throttle fuel or torque converter related
 

Last edited by Gabe Puzon; 05-16-2019 at 11:19 AM.
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Old 05-15-2019, 04:37 PM
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vid attached

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Old 05-15-2019, 05:38 PM
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Manual transmission? Could be clutch slipping and quickly building enough friction to grab again.

Get out on the highway in 6th gear and stomp the throttle wide open. If the tach jumps but the car doesn't accelerate to keep pace then it's definitely a worn clutch.
 
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Old 05-15-2019, 05:41 PM
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thanks, (i wish it was manual) but it's an auto, I'll put it up top so it's more clear
 
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Old 05-15-2019, 05:42 PM
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And the tires are NOT spinning correct?

What modifications if any do you have.
 
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Old 05-15-2019, 05:44 PM
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It definitely sounds like something was slipping though, my suspicion is that it's clutch related so for a 5AT that would be clutch packs on 1st gear. When was your last transmission drain/fill and what did the fluid look like?
 
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Old 05-15-2019, 05:53 PM
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Originally Posted by [email protected] View Post
It definitely sounds like something was slipping though, my suspicion is that it's clutch related so for a 5AT that would be clutch packs on 1st gear. When was your last transmission drain/fill and what did the fluid look like?

I had someone drop a new motor in and he replaced all fluids about 9k miles ago(december), he didn't tell me the fluid looked dirty.
i'm going to check from the throttle body to the air filter for any cracks that could be letting in too much air as soon as the apartment complex manager leaves.

I don't think it's slipping (although it could be) because my RPM barely inches up and down, you can hear in the video how the speed increases as soon as it starts "catching". it just seems unreasonable to be a slip if it only happens that perfect moment(which made me think it was a spark plug or misfire) but it only happens in first gear it seems.
The RPM is going the same pace as the speed, but the cars lurching from 3-5k RPM. it feels like i'm driving in a manual and two stepping in first gear until it shifts

definitely going to be changing the transmission oil as a precautionary step
 
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Old 05-15-2019, 05:55 PM
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Originally Posted by [email protected] View Post
And the tires are NOT spinning correct?

What modifications if any do you have.
the tires(front and rear are all 225-55-r17) are spinning but not loosely. when it starts lurching i feel my tires losing power also. it spins with the RPM, so it feels like the drive train is correctly functioning in regards to the tires spinning, which makes me think it wouldn't be anything transmission related.
 
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Old 05-15-2019, 06:01 PM
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It seems like it is only when the throttle is completely open, because it doesn't happen if i'm slowly accelerating up to the next gear( from first to second, but if I accelerate in the high RPM range [3-5k] it'll become "bouncy" and the RPM will bounce up and down with the speed of the car)
 

Last edited by Gabe Puzon; 05-15-2019 at 06:36 PM.
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Old 05-15-2019, 06:34 PM
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Originally Posted by [email protected] View Post
Manual transmission? Could be clutch slipping and quickly building enough friction to grab again.

Get out on the highway in 6th gear and stomp the throttle wide open. If the tach jumps but the car doesn't accelerate to keep pace then it's definitely a worn clutch.
also, I tried this last night to test that(scary as ****) and it accelerated smoothly passed 80 in 6th gear
 
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Old 05-15-2019, 06:57 PM
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right now all i could think of as possibilities is
1:my fuel pressure is just slightly too low, and first gear is the only gear demanding enough to exceed the amount of fuel available
2: throttle body isn't opening up all of the way
3: throttle body is allowing too much air in because there could be an air leak after the throttle
4:transmission is slipping in first gear at high rpm only?
5: some sort of sensor is broken or my ECM/ECU got fried somehow
 
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Old 05-16-2019, 11:18 AM
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Bump pls help lol
 
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Old 05-16-2019, 01:14 PM
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My advice at this time is take it a local Nissan dealer (cheaper than Infiniti) and pay the $150 or so for a diagnostic check. It'll tell you exactly what's wrong and what needs to be done t fix it. We can only help so much and you might wait 2-3 more days for someone to finally figure it out here.
 
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Old 05-17-2019, 02:43 PM
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Originally Posted by Blue Dream View Post
My advice at this time is take it a local Nissan dealer (cheaper than Infiniti) and pay the $150 or so for a diagnostic check. It'll tell you exactly what's wrong and what needs to be done t fix it. We can only help so much and you might wait 2-3 more days for someone to finally figure it out here.
Im hoping I can avoid that because Iím kind of broke right now, but if itís comes down to it and it becomes more noticeable Iíll definitely take it to prevent anything else from breaking. Also I found out itís heat sensitive like it doesnít happen right after a cold start; so that leads me to believe itís a sensor that just starts acting up when itís either active or maybe the wires or sauters (idk how itís spelled) which is somewhat relieving. Thanks for letting me know Nissan will be cheaper though!
 
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Old 05-17-2019, 02:56 PM
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Also if I slowly accelerate this doesnít happen only when Iím close to flooring it. It feels as if Iím accelerating on a really bumpy road causing it to cut power with every bump and once it shifts into the next gear it goes back to normal. Also my suspension is really shitty right now so Iím wondering if anything behind the tires could be causing it like a busted strut or spring? But I wouldnít expect it to be jumping because the suspension canít handle the power, or if thatís even possible
 

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