Why Did My Z, Keep Revving? Video.

Modshack · 01-30-2010, 09:58 AM

Quote:

Originally Posted by AK370Z

As you can see, if I move the shifter from 6th to Neutral, RPM goes up( just enough for 5th gear) and stays there until I pop it to 5th. BUT, if I move the shifter to the left (while staying in neutral), car thinks I want to downshift even further (3 or 4th gear) and REVS the RPM even more. This is a very normal behavior and as mentioned above almost ALL of the 370Z owners with SRM experience this (except modshack). Modshack, maybe this video will show you what we are trying to explain.

Wow....Personally I would find that behavior VERY annoying. I had no idea you guys were having to put up with that. If mine did that I'd most likely turn it off... Looks like Pushing Tin and I are the lucky ones out of this group...

MightyBobo · 01-30-2010, 10:02 AM

If you're cruising in 6th, and pop it into neutral (actually letting go of the stock), it will automatically blip the throttle to 4th gears required RPM. It automatically assumes the "minimum amount" it needs to rev to (as in, the highest gear to choose). If you decide to go into 3rd instead, it'll rev even higher of course. Wiggle the shifter around in neutral into the 1/2 gate, and it'll rev to 2nd gear levels. I remember doing this when I was test driving - doing the neutral wiggle is a habit of mine.

TheWeatherman · 01-30-2010, 10:12 AM

But AK was movin' though! Mine does that too just to keep the revs up enough so if you select a lower gear, it doesn't have to rev so dramatically. I'm trying to think... Doesn't it shut itsself off/let the RPM drop if you leave your shifter in the same spot, outside of any gate, without motion after a few seconds? I'm just asking. It's like the car saying, "Okay, no gear selected rev matching? I'm going to leave you idle in neutral." Just a question. Not a fault. My SRM works/(worked

) perfectly everytime!

1slow370 · 01-30-2010, 10:35 AM

actually with mine i have noticed that if i hammer it for a while when i take it out of gear it will hold revs longer than if i cruise on the highway without shifting for hours and mine acts exactly like ak's. I actually have this wierd habit now that when i'm driving around i will push the clutch in and take it out of gear and hold the stick to the right side to get it to drop revs while i coast. Freaked me out the first time i did it in my neon and the revs didn't drop.

MeetJoeAsian · 01-30-2010, 04:05 PM

Quote:

Originally Posted by TheWeatherman

But AK was movin' though! Mine does that too just to keep the revs up enough so if you select a lower gear, it doesn't have to rev so dramatically. I'm trying to think... Doesn't it shut itsself off/let the RPM drop if you leave your shifter in the same spot, outside of any gate, without motion after a few seconds? I'm just asking. It's like the car saying, "Okay, no gear selected rev matching? I'm going to leave you idle in neutral." Just a question. Not a fault. My SRM works/(worked

) perfectly everytime!

quick question, when your car is coasting in neutral, is your foot on the clutch? I think, if I remember correctly, having your clutch in gives the SRM the signal that you may be engaging a gear, thus causing it to rev up....then again, i could be wrong...I'm at work right now so I can't really try it out, but I think your RPM only goes up when you clutch...

m4a1mustang · 01-30-2010, 04:07 PM

Quote:

Originally Posted by MeetJoeAsian

quick question, when your car is coasting in neutral, is your foot on the clutch? I think, if I remember correctly, having your clutch in gives the SRM the signal that you may be engaging a gear, thus causing it to rev up....then again, i could be wrong...I'm at work right now so I can't really try it out, but I think your RPM only goes up when you clutch...

Yeah.. if I pop out of gear and go to neutral with the clutch pedal pressed, SRM will sometimes blip the throttle. But if I just ease out of gear and let off the clutch pedal nothing happens.

MightyBobo · 01-30-2010, 04:30 PM

So I finally watched the video after coming home. Im sticking with a TPS sensor.

TheWeatherman · 01-30-2010, 06:28 PM

Quote:

Originally Posted by MightyBobo

So I finally watched the video after coming home. Im sticking with a TPS sensor.

Is this common? For all who think I'm engaging the SRM, remember, my car was at 0 MPH. I even get out of the car at near the end of the video, and I'm still getting over 3,000 RPM. Yeah... a faulty TPS would mean your throttle is messed up. You should've seen it when it was doing over 4,500 RPM. I didn't think of taking a video since I was moving floormats and restarting the car at every intersection. It would rev right up after a restart. Bobo, appreciate the input. Spearfish, you're still the man.

Oh, by the way, my clutch didn't like this little incident very much.

m4a1mustang · 01-30-2010, 06:30 PM

Quote:

Originally Posted by TheWeatherman

Is this common? For all who think I'm engaging the SRM, remember, my car was at 0 MPH. I even get out of the car at near the end of the video, and I'm still getting over 3,000 RPM. Yeah... a faulty TPS would mean your throttle is messed up. You should've seen it when it was doing over 4,500 RPM. I didn't think of taking a video since I was moving floormats and restarting the car at every intersection. It would rev right up after a restart. Bobo, appreciate the input. Spearfish, you're still the man.

Oh, by the way, my clutch didn't like this little incident very much.

Could be the TPS. There is a procedure to recalibrate the throttle... I'm sure the service department is going to try that.

nuTinmuch · 01-30-2010, 07:31 PM

Quote:

Originally Posted by AK370Z

(sorry for the cheesy forum advertisement at the end

. I usually get tons of questions in comments section so I explained everything on the video)

Completely OT, but you have a good taste in music.

MightyBobo · 01-30-2010, 09:13 PM

Quote:

Originally Posted by m4a1mustang

Could be the TPS. There is a procedure to recalibrate the throttle... I'm sure the service department is going to try that.

Its pretty easy if I remember right - look for the service manuals on the website here. Its a matter of mashing the throttle to 100% and then 0% back and forth, but you need to get it into calibration mode...

ChrisSlicks · 01-30-2010, 10:00 PM

I agree with Bobo, sounds like the accelerator pedal position sensor is a viable culprit given these cars are fly by wire throttle.

Section EC (Engine Control System), page 18

ACCELERATOR PEDAL RELEASED POSITION LEARNING
ACCELERATOR PEDAL RELEASED POSITION LEARNING : Description
Accelerator Pedal Released Position Learning is a function of ECM to learn the fully released position of the accelerator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each time the harness connector of the accelerator pedal position sensor or ECM is disconnected.

ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Requirement

1.START
1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch ON and wait at least 2 seconds.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON and wait at least 2 seconds.
5. Turn ignition switch OFF and wait at least 10 seconds.

spearfish25 · 01-30-2010, 10:11 PM

If this was the issue, then it wouldn't happen sporadically.

ChrisSlicks · 01-30-2010, 10:22 PM

Quote:

Originally Posted by spearfish25

If this was the issue, then it wouldn't happen sporadically.

It could due to small fluctuations in the output voltage of the sensor.

1slow370 · 01-31-2010, 02:27 AM

haha watch this be related to the ETB buzzing from not being correctly grounded

01-30-2010, 10:02 AM	#62 (permalink)
MightyBobo A True Z Fanatic Join Date: Feb 2009 Location: Las Vegas, NV Posts: 8,465 Drives: No cars; only bikes Rep Power: 53	If you're cruising in 6th, and pop it into neutral (actually letting go of the stock), it will automatically blip the throttle to 4th gears required RPM. It automatically assumes the "minimum amount" it needs to rev to (as in, the highest gear to choose). If you decide to go into 3rd instead, it'll rev even higher of course. Wiggle the shifter around in neutral into the 1/2 gate, and it'll rev to 2nd gear levels. I remember doing this when I was test driving - doing the neutral wiggle is a habit of mine. __________________ I don't own a car anymore.

01-30-2010, 04:30 PM	#67 (permalink)
MightyBobo A True Z Fanatic Join Date: Feb 2009 Location: Las Vegas, NV Posts: 8,465 Drives: No cars; only bikes Rep Power: 53	So I finally watched the video after coming home. Im sticking with a TPS sensor. __________________ I don't own a car anymore.

01-30-2010, 10:11 PM	#73 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1857	If this was the issue, then it wouldn't happen sporadically. __________________ 2013 Cadillac V-Wagon, RIP Z

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01-30-2010, 10:12 AM	#63 (permalink)
TheWeatherman Enthusiast Member Join Date: Mar 2009 Location: Milwaukee, WI Posts: 265 Drives: 2009 370Z 6MTw/Sport Rep Power: 17	But AK was movin' though! Mine does that too just to keep the revs up enough so if you select a lower gear, it doesn't have to rev so dramatically. I'm trying to think... Doesn't it shut itsself off/let the RPM drop if you leave your shifter in the same spot, outside of any gate, without motion after a few seconds? I'm just asking. It's like the car saying, "Okay, no gear selected rev matching? I'm going to leave you idle in neutral." Just a question. Not a fault. My SRM works/(worked ) perfectly everytime!

01-30-2010, 10:35 AM	#64 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	actually with mine i have noticed that if i hammer it for a while when i take it out of gear it will hold revs longer than if i cruise on the highway without shifting for hours and mine acts exactly like ak's. I actually have this wierd habit now that when i'm driving around i will push the clutch in and take it out of gear and hold the stick to the right side to get it to drop revs while i coast. Freaked me out the first time i did it in my neon and the revs didn't drop.

01-30-2010, 10:00 PM	#72 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 654	I agree with Bobo, sounds like the accelerator pedal position sensor is a viable culprit given these cars are fly by wire throttle. Section EC (Engine Control System), page 18 ACCELERATOR PEDAL RELEASED POSITION LEARNING ACCELERATOR PEDAL RELEASED POSITION LEARNING : Description Accelerator Pedal Released Position Learning is a function of ECM to learn the fully released position of the accelerator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each time the harness connector of the accelerator pedal position sensor or ECM is disconnected. ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Requirement 1.START 1. Make sure that accelerator pedal is fully released. 2. Turn ignition switch ON and wait at least 2 seconds. 3. Turn ignition switch OFF and wait at least 10 seconds. 4. Turn ignition switch ON and wait at least 2 seconds. 5. Turn ignition switch OFF and wait at least 10 seconds.

01-31-2010, 02:27 AM	#75 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	haha watch this be related to the ETB buzzing from not being correctly grounded