Unexplained Limp Mode

tru_Asiatik · 10-26-2012, 08:50 AM

Quote:

Originally Posted by clchisholm

I am in Chattanooga TN and just went for a coffee run in my 40th. Hit the onramp at 75MPH and my baby handled wonderfully. Tight and straight through the clover leaf.....once I exited the turn to hit the striaght line onto the highway, I had no power. I could only do roughly 40mph and had to pull over, turn her off and back on. Once back on, no issues at all. Does this "limp mode" have to do with some sort of G force during the turn or maybe a loss in oil pressure due to the turn?

Thanks for any assistance.

Sorry to bring this back up but this is the exact issue im having right now... Has anyone figured out the cause? :/

ChrisSlicks · 10-26-2012, 10:38 AM

Quote:

Originally Posted by tru_Asiatik

Sorry to bring this back up but this is the exact issue im having right now... Has anyone figured out the cause? :/

Check your brake switch. If you have access to an area with no traffic you can test this by pulling the brake light fuse.

cossie1600 · 10-26-2012, 10:53 AM

yeah fuel starve

juld0zer · 08-26-2014, 07:31 PM

ChrisSlicks, i'm struggling to cure my random limp mode problem.

Mine hasn't limited me to 3500rpm but instead the revs while in gear just take forever to climb, as in the car accelerates extremely slowly. Throttle position seems limited to 15 degrees.

My brake switches are fine and adjusted per the manual. Conditions were cool and it's definitely not VDC. No dtc or CEL.

Both cam and crank sensors fail the resistance tests from the manual. Pin 3 seems dead. Car starts and runs fine until the random limo kicks in. Idle is smooth with the occasional sag to 500rpm

paratrooper · 08-27-2014, 08:33 AM

Quote:

Originally Posted by Dallas-Z

I did not reset the ECU, I just drove it home and parked it. 7 hours later I fired up the car and couldn't get it to replicate the error. If I did not in fact hit the limp mode, why did the car decide to hold itself to 3500rpm and reset itself?

The only other clue that could mean anything is I had just clocked 3000 exact miles on the car during the 18 mile trip. But in order for me to prove this, I'd need a poster who is close to hitting that to test the before and after response of the car while it is still running, shutting off the car would just reset it. I wonder if there is any documentation that would point to a 3000 mile point and warn you of this "inconvenience".

I just rolled 3k yesterday and haven't had a single issue to date.

shfeddy · 08-29-2014, 07:16 AM

My 09 just started doing this too. However it just got tuned on the dyno and I feel the tune might be the issue. Ill be doing 55-65mph and go to pass some one with moderate acceleration, hit maybe 75 mph and it sometimes goes into limp mode. I cant rev past 2-2.5K rpm. Ill turn off my car, wait 10 sec, restart and be fine. This has happened twice now and its starting to annoy me.

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

cfran22 · 10-19-2014, 08:37 PM

I just experienced this yesterday. After pulling onto a highway, my 09 Z started to hit the rev limiter @3500 MPH. I just drove it below 3500 until I stopped at a restaurant. After leaving the restaurant, it was like noting happened. I guessed it may be software related, so I hit up the Forum, looking for answers and came across this post. I guess no one has found anything definitive as yet so I guess we just keep on having fun in our Z

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

FLUJOKE · 02-05-2015, 07:19 PM

My 2014 just did this last night.....vdc was on in Auto, fresh cold start just driving normal, nothing crazy but when i tried to accelerate i wasn't getting any power. I had to turn it off twice to get her to behave right.....WTF is going on with my car. HELP!!!!!

BGTV8 · 02-05-2015, 07:36 PM

Quote:

Originally Posted by 370Zsteve

Somebody please find my old Buick that only had an engine with 8 spark plug wires and a couple of coolant hoses outside the block and nothing remotely resembling a computer. Thank you in advance.

My Buick 215 with 8 spark plug leads, coolant, and quad Weber carb's .... lo-tech and it works !!!

smoothtransit · 04-17-2015, 11:56 AM

Im having the same issue with my 09. It feels like it stalls for a second around 3500 rpm then regains power then does it again in another gear. Went away for a couple months then just came back... I really wish i knew what was wrong with ti so i could fix it..

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.

08-29-2014, 07:16 AM	#36 (permalink)
shfeddy Base Member Join Date: Jul 2012 Location: Okinawa, Japan Posts: 63 Drives: 09 Nissan 370z Rep Power: 12	My 09 just started doing this too. However it just got tuned on the dyno and I feel the tune might be the issue. Ill be doing 55-65mph and go to pass some one with moderate acceleration, hit maybe 75 mph and it sometimes goes into limp mode. I cant rev past 2-2.5K rpm. Ill turn off my car, wait 10 sec, restart and be fine. This has happened twice now and its starting to annoy me. __________________ ^Stillen SC kit^ 345 WHP Stillen 19 Row Oil Cooler TSW Nurburgring * Nitto555 305x30x18* 255x45x18

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10-26-2012, 10:53 AM	#33 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 29	yeah fuel starve

08-26-2014, 07:31 PM	#34 (permalink)
juld0zer Enthusiast Member Join Date: Nov 2012 Location: Sydney Posts: 428 Drives: 11 Nissan 370Z MB M6 Rep Power: 138	ChrisSlicks, i'm struggling to cure my random limp mode problem. Mine hasn't limited me to 3500rpm but instead the revs while in gear just take forever to climb, as in the car accelerates extremely slowly. Throttle position seems limited to 15 degrees. My brake switches are fine and adjusted per the manual. Conditions were cool and it's definitely not VDC. No dtc or CEL. Both cam and crank sensors fail the resistance tests from the manual. Pin 3 seems dead. Car starts and runs fine until the random limo kicks in. Idle is smooth with the occasional sag to 500rpm

08-29-2014, 10:20 AM	#37 (permalink)
Justice97 Enthusiast Member Join Date: Sep 2013 Location: San Antonio Posts: 387 Drives: 11 370Z MB M6 Rep Power: 15	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	#38 (permalink)
juld0zer Enthusiast Member Join Date: Nov 2012 Location: Sydney Posts: 428 Drives: 11 Nissan 370Z MB M6 Rep Power: 138	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

10-19-2014, 08:37 PM	#39 (permalink)
cfran22 Base Member Join Date: Jun 2014 Location: Florida/Bermuda Posts: 18 Drives: 2009 370z CY AT Rep Power: 10	I just experienced this yesterday. After pulling onto a highway, my 09 Z started to hit the rev limiter @3500 MPH. I just drove it below 3500 until I stopped at a restaurant. After leaving the restaurant, it was like noting happened. I guessed it may be software related, so I hit up the Forum, looking for answers and came across this post. I guess no one has found anything definitive as yet so I guess we just keep on having fun in our Z

02-05-2015, 07:19 PM	#41 (permalink)
FLUJOKE Track Member Join Date: Apr 2012 Location: earth Posts: 770 Drives: car Rep Power: 2067	My 2014 just did this last night.....vdc was on in Auto, fresh cold start just driving normal, nothing crazy but when i tried to accelerate i wasn't getting any power. I had to turn it off twice to get her to behave right.....WTF is going on with my car. HELP!!!!!

04-17-2015, 11:56 AM	#43 (permalink)
smoothtransit Base Member Join Date: Dec 2014 Location: Seattle Posts: 63 Drives: 09 370 BS 6mt Rep Power: 10	Im having the same issue with my 09. It feels like it stalls for a second around 3500 rpm then regains power then does it again in another gear. Went away for a couple months then just came back... I really wish i knew what was wrong with ti so i could fix it..

04-24-2015, 06:14 PM	#45 (permalink)
Sorrovv Base Member Join Date: Jan 2013 Location: Atlanta, GA Age: 40 Posts: 18 Drives: 11 370z Tour/Spt 6MT Rep Power: 12	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.