Throttle body /high idle
08-18-2013, 03:47 PM
#1
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Thread Starter
Join Date: Jan 2009
Location: Maryland
Posts: 29
Throttle body /high idle
Okay...just cleaned the throttle body and I did unplug the two connectors on the side but not the battery. Replaced everything. At first the car did not want to start, but after messing with the gas pedal it started. Now the thing is, the idle is very high. Did the relearn thing. How much would the Nissan dealer charge to relearn my ride??
08-18-2013, 04:38 PM
#2
More than you'd like to be paying is my guess.
Did you try adjusting the throttle cables? Probably the first thing you should try after messing with your TB, your idle is bound to be off if those cables were inadvertantly adjusted during your cleaning.
Did you try adjusting the throttle cables? Probably the first thing you should try after messing with your TB, your idle is bound to be off if those cables were inadvertantly adjusted during your cleaning.
08-18-2013, 05:15 PM
#5
Since when is there an idle relearn on a 4th gen??
I know the 5th gen has one so this post is confusing to me.
Check to make sure you reconnected the often overlooked vacuum line at the bottom on your TB.
I know the 5th gen has one so this post is confusing to me.
Check to make sure you reconnected the often overlooked vacuum line at the bottom on your TB.
08-18-2013, 05:50 PM
#8
Please link to where you are getting this information.
I respectfully disagree about the 4th gens needing a manual relearn procedure.
I've pulled apart a few VQ's and this is never discussed until you own a 2000+ maxima due to ours(95-99) being a cable operated TB and the 5th gen being a drive by wire.
It might even not apply until you hit the 5.5 gens.
Also how did you clean your TB throughly without removing it?
Link please.
I respectfully disagree about the 4th gens needing a manual relearn procedure.
I've pulled apart a few VQ's and this is never discussed until you own a 2000+ maxima due to ours(95-99) being a cable operated TB and the 5th gen being a drive by wire.
It might even not apply until you hit the 5.5 gens.
Also how did you clean your TB throughly without removing it?
Link please.
08-18-2013, 06:05 PM
#9
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Thread Starter
Join Date: Jan 2009
Location: Maryland
Posts: 29
OBD II Trouble Code P0505 (Idle Air Control Valve) for 1996 Nissan Maxima
My vehicle is pulling trouble code P0505 (air idle control). The check engine light is on. The vehicle is a 1996 Nissan Maxima. How do I fix the code and have the vehicle pass the smog check? It already failed one smog test. I don't want to fail a second time.
by Fred 12-19-11 02:17 PM
ANSWER:
Trouble Code P0505 on your Nissan Maxima indicates an Idle Air Control System malfunction, which may be caused due to either an unplugged or defective Idle Air Control Valve (IACV). Typically when the IACV fails on this vehicle, it almost always damages the ECU (Engine Control Module). If this is the case, after replacing the IACV you will need a new ECU as well. The ECU will need to be programmed and the Idle Air Control System re-learned.
Replacing the IACV will be your first task. After which you will need to erase the P05050 OBD II trouble code using a scan tool (in order to turn off the check engine light). Next the Idle Air Control Valve will need to re-learn it's position and reset itself. If code P05050 re-appears after this is all done, then chances are the defective IACV damaged the ECU, and the ECU will need to be replaced.
If you will be replacing the IACV yourself, the following is the IACV learning procedure:
Turn ignition switch “ON” and wait at least 1 second.
2. Turn ignition switch “OFF” and wait at least 10 seconds.
3. Start engine and warm it up to normal operating temperature.
4. Check that all items listed under the topic “PRE-CONDITIONING”
(previously mentioned) are in good order.
5. Turn ignition switch “OFF” and wait at least 10 seconds.
6. Start the engine and let it idle for at least 30 seconds.
7. Disconnect throttle position sensor harness connector (brown),
then reconnect it within 5 seconds.
8. Wait 20 seconds.
9. Make sure that idle speed is within specifications. If not, the
result will be incomplete. In this case, find the cause of the
problem by referring to the NOTE below.
10. Rev up the engine two or three times. Make sure that idle
speed and ignition timing are within specifications.
The Idle Speed you are trying to achieve is below:
Idle speed M/T: 625±50 rpm
A/T: 700±50 rpm (in “P” or “N” position)
Ignition timing M/T: 15°±5° BTDC
A/T: 15°±5° BTDC (in “P” or “N” position)
posted by SmogTips Support 12-20-11 07:37 AM
My vehicle is pulling trouble code P0505 (air idle control). The check engine light is on. The vehicle is a 1996 Nissan Maxima. How do I fix the code and have the vehicle pass the smog check? It already failed one smog test. I don't want to fail a second time.
by Fred 12-19-11 02:17 PM
ANSWER:
Trouble Code P0505 on your Nissan Maxima indicates an Idle Air Control System malfunction, which may be caused due to either an unplugged or defective Idle Air Control Valve (IACV). Typically when the IACV fails on this vehicle, it almost always damages the ECU (Engine Control Module). If this is the case, after replacing the IACV you will need a new ECU as well. The ECU will need to be programmed and the Idle Air Control System re-learned.
Replacing the IACV will be your first task. After which you will need to erase the P05050 OBD II trouble code using a scan tool (in order to turn off the check engine light). Next the Idle Air Control Valve will need to re-learn it's position and reset itself. If code P05050 re-appears after this is all done, then chances are the defective IACV damaged the ECU, and the ECU will need to be replaced.
If you will be replacing the IACV yourself, the following is the IACV learning procedure:
Turn ignition switch “ON” and wait at least 1 second.
2. Turn ignition switch “OFF” and wait at least 10 seconds.
3. Start engine and warm it up to normal operating temperature.
4. Check that all items listed under the topic “PRE-CONDITIONING”
(previously mentioned) are in good order.
5. Turn ignition switch “OFF” and wait at least 10 seconds.
6. Start the engine and let it idle for at least 30 seconds.
7. Disconnect throttle position sensor harness connector (brown),
then reconnect it within 5 seconds.
8. Wait 20 seconds.
9. Make sure that idle speed is within specifications. If not, the
result will be incomplete. In this case, find the cause of the
problem by referring to the NOTE below.
10. Rev up the engine two or three times. Make sure that idle
speed and ignition timing are within specifications.
The Idle Speed you are trying to achieve is below:
Idle speed M/T: 625±50 rpm
A/T: 700±50 rpm (in “P” or “N” position)
Ignition timing M/T: 15°±5° BTDC
A/T: 15°±5° BTDC (in “P” or “N” position)
posted by SmogTips Support 12-20-11 07:37 AM
08-18-2013, 06:14 PM
#11
If your IAVC is having problems, pull it and clean it up if your sure you didn't accidentally unplug one of the plugs when your cleaned your TB.
Check the 4th gen stickies.
08-18-2013, 06:21 PM
#12
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Thread Starter
Join Date: Jan 2009
Location: Maryland
Posts: 29
Well..I cleaned the IACV 2 days ago. Everything went perfect.
It's just that when I cleaned the butterfly 2day, idle got screwed up and car didnt want to start. Disconnected two fat hoses and the small worm like one.
It's just that when I cleaned the butterfly 2day, idle got screwed up and car didnt want to start. Disconnected two fat hoses and the small worm like one.
08-19-2013, 06:11 AM
#14
Member who somehow became The President of The SE-L Club
iTrader: (19)
Join Date: Jun 2001
Posts: 16,033
There is no such thing as an idle relearn on a 4th gen.
To reset the idle do the following:
Warm up engine, drive at least 5 miles.
Turn off engine and disconnect the TPS.
Restart engine, make sure all accessories are off.
Adjust idle speed using the default throttle body set screw to obtain 600 rpm.
Turn off engine and reconnect the TPS.
Restart engine and observe idle speed. It should be around 700 rpm. If adjustment is necessary to obtain 700 rpm, use the air bypass screw on the IACV.
The ECU doesn't relearn anything, what you accomplish here is you place the IACV & ECU in control of the idle speed. After cleaning the TB, to much air can pass by the plates and the IACV cannot decrease the flow enough to gain control. The above procedure corrects that by decreasing the air flow just under the minimum the IACV can flow.
This question and this process should really be a sticky.
To reset the idle do the following:
Warm up engine, drive at least 5 miles.
Turn off engine and disconnect the TPS.
Restart engine, make sure all accessories are off.
Adjust idle speed using the default throttle body set screw to obtain 600 rpm.
Turn off engine and reconnect the TPS.
Restart engine and observe idle speed. It should be around 700 rpm. If adjustment is necessary to obtain 700 rpm, use the air bypass screw on the IACV.
The ECU doesn't relearn anything, what you accomplish here is you place the IACV & ECU in control of the idle speed. After cleaning the TB, to much air can pass by the plates and the IACV cannot decrease the flow enough to gain control. The above procedure corrects that by decreasing the air flow just under the minimum the IACV can flow.
This question and this process should really be a sticky.
Last edited by njmaxseltd; 08-19-2013 at 10:44 AM.
08-19-2013, 10:11 AM
#15
There is no such think as an idle relearn on a 4th gen.
To reset the idle do the following:
Warm up engine, drive at least 5 miles.
Turn off engine and disconnect the TPS.
Restart engine, make sure all accessories are off.
Adjust idle speed using the default throttle body set screw to obtain 600 rpm.
Turn off engine and reconnect the TPS.
Restart engine and observe idle speed. It should be around 700 rpm. If adjustment is necessary to obtain 700 rpm, use the air bypass screw on the IACV.
The ECU doesn't relearn anything, what you accomplish here is you place the IACV & ECU in control of the idle speed. After cleaning the TB, sometime to much air can pass by the plates and the IACV cannot decrease the flow enough to gain control. The above procedure corrects that by decreasing the air flow just under the minimum the IACV can flow.
This question and this process should really be a sticky.
To reset the idle do the following:
Warm up engine, drive at least 5 miles.
Turn off engine and disconnect the TPS.
Restart engine, make sure all accessories are off.
Adjust idle speed using the default throttle body set screw to obtain 600 rpm.
Turn off engine and reconnect the TPS.
Restart engine and observe idle speed. It should be around 700 rpm. If adjustment is necessary to obtain 700 rpm, use the air bypass screw on the IACV.
The ECU doesn't relearn anything, what you accomplish here is you place the IACV & ECU in control of the idle speed. After cleaning the TB, sometime to much air can pass by the plates and the IACV cannot decrease the flow enough to gain control. The above procedure corrects that by decreasing the air flow just under the minimum the IACV can flow.
This question and this process should really be a sticky.
08-19-2013, 05:55 PM
#16
Junior Member
Thread Starter
Join Date: Jan 2009
Location: Maryland
Posts: 29
Njmax...wish I saw ur thread earlier, what a day I had. Nissan dealer was no help. They charge me $70 to tell me that it might be my egr valve and wanted to hit me with $800plus to do the service. Heck no!! Ur right there's no relearn for 4th gen. Just went outside did what u said...seems better. Will know for sure 2morrow when I take it on the highway.
THANKS!!
THANKS!!
08-21-2013, 08:32 PM
#21
Newbie - Just Registered
Join Date: Aug 2013
Posts: 12
Please link to where you are getting this information.
I respectfully disagree about the 4th gens needing a manual relearn procedure.
I've pulled apart a few VQ's and this is never discussed until you own a 2000+ maxima due to ours(95-99) being a cable operated TB and the 5th gen being a drive by wire.
It might even not apply until you hit the 5.5 gens.
Also how did you clean your TB throughly without removing it?
Link please.
I respectfully disagree about the 4th gens needing a manual relearn procedure.
I've pulled apart a few VQ's and this is never discussed until you own a 2000+ maxima due to ours(95-99) being a cable operated TB and the 5th gen being a drive by wire.
It might even not apply until you hit the 5.5 gens.
Also how did you clean your TB throughly without removing it?
Link please.
08-29-2013, 06:56 PM
#23
Any check engine light codes?
In my own funky idle endeavors it's been:
A Vacuum leak. Problematic areas for me have been in or around the air intake/MAF, also the EGR guide tube.
Cleaning the IACV, MAF (with ONLY mass air flow cleaner) tb, as you mentioned.
You didn't mention if it's still idling high, but I thought id throw these ideas out there because they've helped me.
In my own funky idle endeavors it's been:
A Vacuum leak. Problematic areas for me have been in or around the air intake/MAF, also the EGR guide tube.
Cleaning the IACV, MAF (with ONLY mass air flow cleaner) tb, as you mentioned.
You didn't mention if it's still idling high, but I thought id throw these ideas out there because they've helped me.
05-15-2022, 07:54 PM
#31
Junior Member
Join Date: May 2018
Posts: 36
I had the same problem…
cleaned TB, IACV, MAF(with only MAF cleaner), cleaned air filter.. my idle went started idling more normal (700-1100rpm) but was having a weird misfire sputter…
now car cranks but won’t start
throttle cable connected to gas peddle is more than 3/8-1/2in loose (as seen in other threads)…
checking spark plugs,. They’re a little wet but not soaked
04-04-2023, 05:23 AM
#32
Newbie - Just Registered
Join Date: Apr 2023
Posts: 1
I think mine was disconnected, and my idle have rev hang specially below 2k.
Last edited by Nomar; 04-04-2023 at 05:15 PM.
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