RPM needle drops to 500 when releasing gas pedal?
#1
Senior Member
Thread Starter
iTrader: (10)
Join Date: Jul 2006
Location: Los Angeles, CA
Posts: 2,077
RPM needle drops to 500 when releasing gas pedal?
PROBLEM FIXED - see posts below
-Automatic trans
When I'm cruising, say at about 2500 rpm @ 40 mph, if i let go of the gas pedal, the RPM needle drops to 500 rpm and bounces back up.
Is this normal? The engine doesnt shutter or anything, it just drops the needle quickly and then it idles normally.
-Automatic trans
When I'm cruising, say at about 2500 rpm @ 40 mph, if i let go of the gas pedal, the RPM needle drops to 500 rpm and bounces back up.
Is this normal? The engine doesnt shutter or anything, it just drops the needle quickly and then it idles normally.
Last edited by shadyonedeath; 05-22-2011 at 11:04 PM.
#2
Mine does something similar, but only when idling for a little while, like while at a light. It will drop to about 450-400rpm, then pop right back up to normal. It only does it for a quick second, and I do feel a little vibration when it does, and then the vibration goes away when the idle returns to normal.
#4
eh? Sounds awfully strange. Do you feel it kicking out of gear when this happens?
On Decel your tranny might drop gear and It could go close to Idle.
My RPM's take a serious Dip on Decel when im really braking hard, or when I tap the brake and coast.
On Decel your tranny might drop gear and It could go close to Idle.
My RPM's take a serious Dip on Decel when im really braking hard, or when I tap the brake and coast.
#6
Senior Member
iTrader: (7)
Join Date: Dec 2004
Location: Alexandria, VA, & Central Jersey
Posts: 2,647
mine did the same thing after my mechanic swapped a used tranny after mine was done. Not sure why it does it I sold the car to a buddy and she is still driving it. been like that for like 3 years.
#7
The only time mine drops that low is during heavy braking, otherwise it tends to idle a little under 800 RPMS.
I sometimes see it under 1000 while driving, if it kicks into OD at low speeds for instance. I wonder if anyone else has an auto that is as eager to go into overdrive as mine? I guess that helps my gas mileage anyway.
I sometimes see it under 1000 while driving, if it kicks into OD at low speeds for instance. I wonder if anyone else has an auto that is as eager to go into overdrive as mine? I guess that helps my gas mileage anyway.
#9
Senior Member
iTrader: (7)
Join Date: Dec 2004
Location: Alexandria, VA, & Central Jersey
Posts: 2,647
if the op symptons were the same as mine. It happens at around 35-40 mph going from a dead stop only. Once you reach 35-40 mph, the rpm needles and engine rev drop to about 500 rpm, after a second or two, comes back up to where the rpm and mph match (ie. 35 mph should be like 2k) Its kind of like pushing in the clutch at 35-40, and then letting it back out. doesn't do anything, don't feel anything but you know thats what happened.
To the OP, i had previously told my mechanic when he changed out my tranny and said that there wasn't anything that was really wrong and he didn't know why either (he's a trusty mechanic and won't screw ppl over). the used tranny has now seen over 38k and is still running strong.
To the OP, i had previously told my mechanic when he changed out my tranny and said that there wasn't anything that was really wrong and he didn't know why either (he's a trusty mechanic and won't screw ppl over). the used tranny has now seen over 38k and is still running strong.
#10
Senior Member
Thread Starter
iTrader: (10)
Join Date: Jul 2006
Location: Los Angeles, CA
Posts: 2,077
No.
yes. similar. Maybe has something to do with low trans fluid? vacuum leak?
if the op symptons were the same as mine. It happens at around 35-40 mph going from a dead stop only. Once you reach 35-40 mph, the rpm needles and engine rev drop to about 500 rpm, after a second or two, comes back up to where the rpm and mph match (ie. 35 mph should be like 2k) Its kind of like pushing in the clutch at 35-40, and then letting it back out. doesn't do anything, don't feel anything but you know thats what happened.
To the OP, i had previously told my mechanic when he changed out my tranny and said that there wasn't anything that was really wrong and he didn't know why either (he's a trusty mechanic and won't screw ppl over). the used tranny has now seen over 38k and is still running strong.
To the OP, i had previously told my mechanic when he changed out my tranny and said that there wasn't anything that was really wrong and he didn't know why either (he's a trusty mechanic and won't screw ppl over). the used tranny has now seen over 38k and is still running strong.
#13
Mine does something similar. Sometimes when I'm going downhill at freeway speeds, it will drop into neutral. The idle drops to 1000 or less, and if I give it gas I can feel it kick back into gear, so I know the tach is reading the engine speed correctly. Mine will also drop out of OD into 3d at inappropriate times, like with a light throttle going up a slight incline (and sometimes it will bounce back and forth). It's only an issue with OD, and I've taken to driving with OD off, which eliminates the problem.
My assumption has been that it has something to do with the torque converter, but I'm not going to replace that until the tranny goes. And I've had this problem for 6 or 7 years now. I'd love to find out that it's some sort of sensor, but I've replaced the TPS, which didn't help, and I'm not willing to drop a couple hundred bucks on a solenoid pack without some assurance that it will fix it.
My assumption has been that it has something to do with the torque converter, but I'm not going to replace that until the tranny goes. And I've had this problem for 6 or 7 years now. I'd love to find out that it's some sort of sensor, but I've replaced the TPS, which didn't help, and I'm not willing to drop a couple hundred bucks on a solenoid pack without some assurance that it will fix it.
#16
this is been going on in my car for about 3 years, cleaning the tb and iacv is not the gonna do a thing, i changed over iacv and still the same thing going on, at arounf 40 mph you let go of the gas pedal and the car still runs proerly but the rpm will go to 4-500rpm and bounce back, i never understood why this happens
#17
Senior Member
Thread Starter
iTrader: (10)
Join Date: Jul 2006
Location: Los Angeles, CA
Posts: 2,077
Lower your volume.
Notes:
-Starts at acceleration from a stop
-Pedal is released when rpm's dip to 500rpm
-When RPM climbs to 1000, pedal is still released and the ECU/engine/whatever is picking itself up.
-Second acceleration is while moving
-Only happens city driving, not highway.
Notes:
-Starts at acceleration from a stop
-Pedal is released when rpm's dip to 500rpm
-When RPM climbs to 1000, pedal is still released and the ECU/engine/whatever is picking itself up.
-Second acceleration is while moving
-Only happens city driving, not highway.
#18
Lower your volume.
Notes:
-Starts at acceleration from a stop
-Pedal is released when rpm's dip to 500rpm
-When RPM climbs to 1000, pedal is still released and the ECU/engine/whatever is picking itself up.
-Second acceleration is while moving
-Only happens city driving, not highway.
Notes:
-Starts at acceleration from a stop
-Pedal is released when rpm's dip to 500rpm
-When RPM climbs to 1000, pedal is still released and the ECU/engine/whatever is picking itself up.
-Second acceleration is while moving
-Only happens city driving, not highway.
#21
Nope.
I can't recall where I found this but there was something posted on here with all of the Normal operating functions of the Auto Trans. I'm sure its in the FSM.
I will say, I do think its a bit strange that yours drops so harshly. But I know that when I am braking heavily for a moment Mine will do the same thing, I think its vacuum related?
I can't recall where I found this but there was something posted on here with all of the Normal operating functions of the Auto Trans. I'm sure its in the FSM.
I will say, I do think its a bit strange that yours drops so harshly. But I know that when I am braking heavily for a moment Mine will do the same thing, I think its vacuum related?
#23
Lower your volume.
Notes:
-Starts at acceleration from a stop
-Pedal is released when rpm's dip to 500rpm
-When RPM climbs to 1000, pedal is still released and the ECU/engine/whatever is picking itself up.
-Second acceleration is while moving
-Only happens city driving, not highway.
Notes:
-Starts at acceleration from a stop
-Pedal is released when rpm's dip to 500rpm
-When RPM climbs to 1000, pedal is still released and the ECU/engine/whatever is picking itself up.
-Second acceleration is while moving
-Only happens city driving, not highway.
RPM's are most defiantly dropping to quick, it should be nice even and slow rpm drop when pedal is let go. Still your problem isnt as severe as mine was, not nearly.
Your IACV is either getting old (higher mileage) or its dirty and clogged, OR both. Might be time to replace it.
#24
If you were accelerating from a stop with OD turned on, then at 35mph the transmission is still in 3rd gear, and in 3rd gear with OD on it is allowed to overrun when you let off the throttle, effectively acting like it is in neutral. So like others wrote, the engine speed dropped a bit too low before the computer used the IACV to bring it back to normal.
#25
Ok so as I stated before I think your IACV is dirty I was on my way home today and from a dead stop to 40 mph slight throttle pressure to absolutely no throttle my needle does NOT move the max decelerates but the rpms stay the same
#26
#28
BTW their are updated shift solenoids available via Nissan.
If you were accelerating from a stop with OD turned on, then at 35mph the transmission is still in 3rd gear, and in 3rd gear with OD on it is allowed to overrun when you let off the throttle, effectively acting like it is in neutral. So like others wrote, the engine speed dropped a bit too low before the computer used the IACV to bring it back to normal.
Actually.. Heres an Idea..
Rev her up to 2K like you did in the Video and drop her into Neutral. See how low she can go.
#29
#30
I have been having the same issue as the most of you guys are as soon as I installed my new tranny, I had the p 1336 code and the knock sensor code I took care of that problem and thank god. I don't have a SES light since than so far, I have been noticing the RPMS are shooting up in the 2000 rpms when I am in the 60 MPH and going faster the RPMS are climbing up and stay up there in the 2500-3000 rpms that's when I am doing 60+. If I am slowing down to 40-35 MPH the RPMS will hover at the 1000-550 RPMS. I noticed my old trans had the VB mod one of the vavles were removed so the flow will be stronger into the VB. I used to be at the 1500 RPMS when I was 35-40 MPH and going up to 60 MPH+ speeds my car was constently at the 1500 RPMS. I think this has alot to do with the vb mods and If theres any doubt I think we should check IF the ECU are shot by the chance and the same for the shifting points on the TCM.
#31
I have been having the same issue as the most of you guys are as soon as I installed my new tranny, I had the p 1336 code and the knock sensor code I took care of that problem and thank god. I don't have a SES light since than so far, I have been noticing the RPMS are shooting up in the 2000 rpms when I am in the 60 MPH and going faster the RPMS are climbing up and stay up there in the 2500-3000 rpms that's when I am doing 60+. If I am slowing down to 40-35 MPH the RPMS will hover at the 1000-550 RPMS. I noticed my old trans had the VB mod one of the vavles were removed so the flow will be stronger into the VB. I used to be at the 1500 RPMS when I was 35-40 MPH and going up to 60 MPH+ speeds my car was constently at the 1500 RPMS. I think this has alot to do with the vb mods and If theres any doubt I think we should check IF the ECU are shot by the chance and the same for the shifting points on the TCM.
if not your torque converter is prolly toast
#32
Senior Member
Thread Starter
iTrader: (10)
Join Date: Jul 2006
Location: Los Angeles, CA
Posts: 2,077
Problem was a vacuum leak in my oil catch can barb fittings. I used plumbers teflon tape instead of gas-line teflon, and it came loose/leaked.
Problem solved. No longer have cold starts, powers back to normal, no more dips.
Problem solved. No longer have cold starts, powers back to normal, no more dips.
#34
As a side note, the TCC is not activated until the transmission warms up. This can take a few miles of driving, especially in cold weather.
#35
can you take a few pictures , i have a 07 and i have the exact same problem. i could use all the help i can get in resolving this
Thread
Thread Starter
Forum
Replies
Last Post
hez8813
5th Generation Maxima (2000-2003)
11
03-12-2020 12:06 AM