Why Did My Z, Keep Revving? Video.

JB1 · 01-31-2010, 06:49 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!

After reading this thread, I tried the "put the shifter in neutral" while driving, and your right Weatherman, the revs go up as in AK's video but they drop after a few seconds. So it's like SRM is concluding "OK, your not going to continue shifting into a lower gear, no need to keep the revs up" I tried it in 6th, going about 60~70MPH. Shift to neutral and RPM's go up to about 4K RPM, so perfect for a shift to 4th, but too high for a shift to 5th, which is kinda strange I think.

However, non of this explain what happened to The Weathermans car. I sure hope it's not something like what Toyota is dealing with now...

Here's the Toyota problem explained (this is also interesting for all of you who want to know how our electronic throttle pedal works)

UPDATED: Video: In-depth look at Toyota's sticky accelerator — Autoblog

MightyBobo · 01-31-2010, 07:46 PM

Quote:

Originally Posted by JB1

After reading this thread, I tried the "put the shifter in neutral" while driving, and your right Weatherman, the revs go up as in AK's video but they drop after a few seconds. So it's like SRM is concluding "OK, your not going to continue shifting into a lower gear, no need to keep the revs up" I tried it in 6th, going about 60~70MPH. Shift to neutral and RPM's go up to about 4K RPM, so perfect for a shift to 4th, but too high for a shift to 5th, which is kinda strange I think.

As long as the clutch is pressed in, SRM will try to blip the throttle when the shifter is moved around. The 3 "major" positions are 1/2, 3/4, and 5/6 of course. If you shift to neutral, clutch pressed in, and release the shifter to its dead-center position, SRM will automatically blip to the MINIMUM amount for the highest gear in that position. That'd be 4th gear. If you decide to go into 3rd, it will of course, blip higher. Same goes for 1/2....it will rev to 2nd gear as soon as you slide to the left, but if you go into 1st instead, it will go higher.

Purpose for this is because its not going to assume you want to rev to the LOWER gear automatically, more than likely to save gas Im sure. Its obviously fast enough to catch if you decide to go higher, and blip accordingly.

If you dont want SRM mucking with your RPM's when you move the shifter in the positions, just release your clutch...SRM stops blipping at that point.

JB1 · 01-31-2010, 08:09 PM

Quote:

Originally Posted by MightyBobo

The 3 "major" positions are 1/2, 3/4, and 5/6 of course. If you shift to neutral, clutch pressed in, and release the shifter to its dead-center position, SRM will automatically blip to the MINIMUM amount for the highest gear in that position. That'd be 4th gear. If you decide to go into 3rd, it will of course, blip higher. Same goes for 1/2....it will rev to 2nd gear as soon as you slide to the left, but if you go into 1st instead, it will go higher.

OK, that makes sense, thanks for the explanation.

But I did notice that, if you leave the shifter in neutral and you release the clutch, SRM will still hold the RPMs up for a few seconds. Not that is matters though, just an observation.

TheWeatherman · 02-04-2010, 04:35 PM

Okay, here's the latest update, and hopefully the final one. First, Nissan sent down their Quality Control Engineer to look at the vehicle. He was happy because he was able to duplicate the randomly revving engine. After taking it out, taking vids, pictures and logging all information into his computer, he said he was sure of the problem. Any guesses?

From his analysis, he's went with malfuntioning clutch and neutral position sensors for the.... Synchro Rev Match. There ya go! Those both were replaced, and so far, wallah! No more problems with the revving engine.

I would like to thank the Quality Control Engineer, Nissan Corporate, Nissan Japan, and Russ Darrow Nissan for the prompt and excellent service. Everyone explained everything to me to a tee. They also completely detailed my car since I only take it out when it's completely dry, and they had it out in the salt. That was an extra touch that really made me happy.

Wrap-up... No stuck throttle, a problem that was fully logged and closely reviewed in Japan's engineering headquarters. Should this ever happen to any of you, it seems to be one or both of those sensors. It's great to have both the 2009 Infiniti FX35 and 2009 370Z back in perfect running order.

To not tarnish Nissan's name and to take down my accusation of a stuck throttle, I'm going to take down that YouTube video if I can figure out how. It's great to see this forum work in such a constructive way. By everyone's input, it made the problem interesting.

Feel free to add anything if you'd wish.

ChrisSlicks · 02-04-2010, 05:02 PM

Great news! Still don't see how it could be the sensors they mentioned given that it would do it from a standstill, maybe they're trying to avoid a Toyota like recall?

m4a1mustang · 02-04-2010, 10:59 PM

Quote:

Originally Posted by TheWeatherman

Okay, here's the latest update, and hopefully the final one. First, Nissan sent down their Quality Control Engineer to look at the vehicle. He was happy because he was able to duplicate the randomly revving engine. After taking it out, taking vids, pictures and logging all information into his computer, he said he was sure of the problem. Any guesses?

From his analysis, he's went with malfuntioning clutch and neutral position sensors for the.... Synchro Rev Match. There ya go! Those both were replaced, and so far, wallah! No more problems with the revving engine.

I would like to thank the Quality Control Engineer, Nissan Corporate, Nissan Japan, and Russ Darrow Nissan for the prompt and excellent service. Everyone explained everything to me to a tee. They also completely detailed my car since I only take it out when it's completely dry, and they had it out in the salt. That was an extra touch that really made me happy.

Wrap-up... No stuck throttle, a problem that was fully logged and closely reviewed in Japan's engineering headquarters. Should this ever happen to any of you, it seems to be one or both of those sensors. It's great to have both the 2009 Infiniti FX35 and 2009 370Z back in perfect running order.

To not tarnish Nissan's name and to take down my accusation of a stuck throttle, I'm going to take down that YouTube video if I can figure out how. It's great to see this forum work in such a constructive way. By everyone's input, it made the problem interesting.

Feel free to add anything if you'd wish.

Wow, thought for sure we had ruled it out but whaddyaknow! Glad it was all sorted out and your service experience was a pleasant one!

semtex · 02-05-2010, 07:58 AM

Quote:

Originally Posted by TheWeatherman

Okay, here's the latest update, and hopefully the final one. First, Nissan sent down their Quality Control Engineer to look at the vehicle. He was happy because he was able to duplicate the randomly revving engine. After taking it out, taking vids, pictures and logging all information into his computer, he said he was sure of the problem. Any guesses?

From his analysis, he's went with malfuntioning clutch and neutral position sensors for the.... Synchro Rev Match. There ya go! Those both were replaced, and so far, wallah! No more problems with the revving engine.

I would like to thank the Quality Control Engineer, Nissan Corporate, Nissan Japan, and Russ Darrow Nissan for the prompt and excellent service. Everyone explained everything to me to a tee. They also completely detailed my car since I only take it out when it's completely dry, and they had it out in the salt. That was an extra touch that really made me happy.

Wrap-up... No stuck throttle, a problem that was fully logged and closely reviewed in Japan's engineering headquarters. Should this ever happen to any of you, it seems to be one or both of those sensors. It's great to have both the 2009 Infiniti FX35 and 2009 370Z back in perfect running order.

To not tarnish Nissan's name and to take down my accusation of a stuck throttle, I'm going to take down that YouTube video if I can figure out how. It's great to see this forum work in such a constructive way. By everyone's input, it made the problem interesting.

Feel free to add anything if you'd wish.

Quote:

Originally Posted by m4a1mustang

Wow, thought for sure we had ruled it out but whaddyaknow! Glad it was all sorted out and your service experience was a pleasant one!

Gee, I seem to recall someone suggesting that it might be a malfunctioning SRM.

m4a1mustang · 02-05-2010, 08:03 AM

Quote:

Originally Posted by semtex

Gee, I seem to recall someone suggesting that it might be a malfunctioning SRM.

semtex · 02-05-2010, 08:04 AM

Quote:

Originally Posted by m4a1mustang

What? Can't admit that someone else was right?

m4a1mustang · 02-05-2010, 08:05 AM

Quote:

Originally Posted by semtex

What? Can't admit that someone else was right?

Well you had an e-attitude about it... manners!

IcedZ · 02-05-2010, 07:12 AM

But why did it only happen to me twice, on two cold days, and never again? If a sensor is bad, it's bad. It shouldn't be weather dependent.

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02-04-2010, 04:35 PM	#4 (permalink)
TheWeatherman Enthusiast Member Join Date: Mar 2009 Location: Milwaukee, WI Posts: 265 Drives: 2009 370Z 6MTw/Sport Rep Power: 18	Okay, here's the latest update, and hopefully the final one. First, Nissan sent down their Quality Control Engineer to look at the vehicle. He was happy because he was able to duplicate the randomly revving engine. After taking it out, taking vids, pictures and logging all information into his computer, he said he was sure of the problem. Any guesses? From his analysis, he's went with malfuntioning clutch and neutral position sensors for the.... Synchro Rev Match. There ya go! Those both were replaced, and so far, wallah! No more problems with the revving engine. I would like to thank the Quality Control Engineer, Nissan Corporate, Nissan Japan, and Russ Darrow Nissan for the prompt and excellent service. Everyone explained everything to me to a tee. They also completely detailed my car since I only take it out when it's completely dry, and they had it out in the salt. That was an extra touch that really made me happy. Wrap-up... No stuck throttle, a problem that was fully logged and closely reviewed in Japan's engineering headquarters. Should this ever happen to any of you, it seems to be one or both of those sensors. It's great to have both the 2009 Infiniti FX35 and 2009 370Z back in perfect running order. To not tarnish Nissan's name and to take down my accusation of a stuck throttle, I'm going to take down that YouTube video if I can figure out how. It's great to see this forum work in such a constructive way. By everyone's input, it made the problem interesting. Feel free to add anything if you'd wish.

02-04-2010, 05:02 PM	#5 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 655	Great news! Still don't see how it could be the sensors they mentioned given that it would do it from a standstill, maybe they're trying to avoid a Toyota like recall?

02-05-2010, 07:12 AM	#11 (permalink)
IcedZ Base Member Join Date: Feb 2009 Location: Gainesville, FL Posts: 194 Drives: 09 370 Yellow, 6MT Rep Power: 18	But why did it only happen to me twice, on two cold days, and never again? If a sensor is bad, it's bad. It shouldn't be weather dependent.