Unexplained Limp Mode

Justice97 · 08-29-2014, 10:20 AM

Would a dirty throttle body have anything to do with this?

I know mine was giving me minor rpm issues and drops till I cleaned them. It has been a couple of weeks and she is still running like a champ.

Maybe it is sticking?

juld0zer · 08-29-2014, 06:28 PM

throttle bodies are often first to blame. whether it be due to sticky flap mechanisms or throttle position sensors which chuck a wonky reading.

i cant remember who it was on here that suggested out of sync throttle bodies as the issue. i've datalogged my throttle bodies and they're about as perfectly in sync as you can get them.

shfeddy - you have a supercharger kit so that adds another variable. but i think a fair few folks with tunes have experienced the random loss of accelerator response. this makes me think there might be one cell in their tuned throttle maps which the ecu doesnt like. hitting that cell would take a certain combination of inputs so it's hard to replicate. i'm still standing by my throttle tune - it's the same map that's been posted up on these forums and most folks have been troublefree so i'm ruling that out for now

P's_Z · 10-20-2014, 09:17 PM

Quote:

Originally Posted by Justice97

Would a dirty throttle body have anything to do with this?

I know mine was giving me minor rpm issues and drops till I cleaned them. It has been a couple of weeks and she is still running like a champ.

Maybe it is sticking?

This ^^^

Read page 4 from the thread i started, and an update in another thread that you will also find in page 4. Dealer cleaned throttle bodies and recalibrated them. Same issue happened to a friend of mine from this forum. Neither of us has had the problem since then

IAmTheStig · 04-18-2015, 06:39 PM

Quote:

Originally Posted by P's_Z

This ^^^

Read page 4 from the thread i started, and an update in another thread that you will also find in page 4. Dealer cleaned throttle bodies and recalibrated them. Same issue happened to a friend of mine from this forum. Neither of us has had the problem since then

I don't understand this; the VQ37VHR opens the throttle bodies all the way at very low accelerator pedal positions and uses the VVEL system to manipulate engine throttle control. Therefore, above idle speeds, I don't see how cleaning the throttle bodies would fix this issue.

This video should explain what I am talking about: http://youtu.be/6i1rBkP8dYs

Sorrovv · 04-24-2015, 06:14 PM

I'm a noob here but I have this to offer:

I've only seen this once in my 2011 370z - I lost the back end and spun 540 degrees into the other lane to face the way I came from. When the car stopped spinning there was still serious reverse momentum and I left the car in gear for a split second. When I drove off I hit limiter at 3500 in any gear so I pulled over and let it cool for 5 minutes. I cranked her up and drove her hard the rest of the day with no issues.

I guessed it had somehow sensed that I had overheated the clutch and never thought of it again. I've never seen it since.

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08-29-2014, 10:20 AM	#1 (permalink)
Justice97 Enthusiast Member Join Date: Sep 2013 Location: San Antonio Posts: 387 Drives: 11 370Z MB M6 Rep Power: 16	Would a dirty throttle body have anything to do with this? I know mine was giving me minor rpm issues and drops till I cleaned them. It has been a couple of weeks and she is still running like a champ. Maybe it is sticking?

08-29-2014, 06:28 PM	#2 (permalink)
juld0zer Enthusiast Member Join Date: Nov 2012 Location: Sydney Posts: 428 Drives: 11 Nissan 370Z MB M6 Rep Power: 139	throttle bodies are often first to blame. whether it be due to sticky flap mechanisms or throttle position sensors which chuck a wonky reading. i cant remember who it was on here that suggested out of sync throttle bodies as the issue. i've datalogged my throttle bodies and they're about as perfectly in sync as you can get them. shfeddy - you have a supercharger kit so that adds another variable. but i think a fair few folks with tunes have experienced the random loss of accelerator response. this makes me think there might be one cell in their tuned throttle maps which the ecu doesnt like. hitting that cell would take a certain combination of inputs so it's hard to replicate. i'm still standing by my throttle tune - it's the same map that's been posted up on these forums and most folks have been troublefree so i'm ruling that out for now

04-24-2015, 06:14 PM	#5 (permalink)
Sorrovv Base Member Join Date: Jan 2013 Location: Atlanta, GA Age: 41 Posts: 18 Drives: 11 370z Tour/Spt 6MT Rep Power: 13	I'm a noob here but I have this to offer: I've only seen this once in my 2011 370z - I lost the back end and spun 540 degrees into the other lane to face the way I came from. When the car stopped spinning there was still serious reverse momentum and I left the car in gear for a split second. When I drove off I hit limiter at 3500 in any gear so I pulled over and let it cool for 5 minutes. I cranked her up and drove her hard the rest of the day with no issues. I guessed it had somehow sensed that I had overheated the clutch and never thought of it again. I've never seen it since.