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Sounds like the same exact jerking problem I have with my car after doing the TB cleaning, I cleaned my TB’s the same way you explained it too. I just don’t want to accept the fact that I might’ve damaged the TB’s since they’re pricey to replace. I’m not 100% sure if that’s the cause of the jerking though because I can hear the TB’s working just fine when I turn the power on. If you take your car to a local auto parts store like Auto Zone they can scan the SES code and tell you what the code and problem is. Even now my car idles high on a cold start around 2000 RPM’s but after a few minutes of warming up it goes down to about 700. However, if your car is warmed up and it’s idling around 1600 then that is defintely not ok. You just have to keep redoing the relearn until you learn it so you can just do it from memory with a stopwatch in your hand (that’s what worked best for me). Give it a try but I’m pretty sure you need the ECM reflash since it’s a 2007 like mine and I had to take to the dealer even by doing the relearn myself hundreds of times. Try doing it on a cold start too because the dealer had to wait 2-3 hours until my car was ice cold for the car to accept the idle relearn and that ended up finally working. I’m pretty sure the 2008 G’s, like Hall Stevenson’s, already has an updated ECM that’s why the car accepts the idle relearn when he did it himself. If you need to go to the dealer for the ECM reflash and idle relearn I’d suggest calling a few Nissan and Infiniti dealers and asking for their price (you’d be surprised how many different quotes I got). Also if you know a reliable shop that can perform the idle relearn from their scanner I’d probably give a try too before taking it to the dealer. However when I tried that option my car wouldn’t take the idle relearn from their scanner because the ECM reflash was necessary.
I’d like to share my experience because I encountered a problem after cleaning the throttle body and MAF sensors on my 2007 g35s 6 speed. I disconnected the battery, removed the throttle body without disconnecting the connectors, moved the butterfly flap to get a good cleaning, didn’t change the gaskets, put everything back together and the idle was surging between 1600 and 2200 when I started the car. Doing the idle relearn about a hundred times did not help. Even smoke tested the intake for leaks. Connected the OBD scanner at my friends shop and attempted the relearn, however the car was not taking it. Finally went to a Nissan dealer for an ECM reflash and idle relearn. 3 hours and $283 later the problem was fixed. The idle is at 650 now and drives like new. I even stalled the car on my way home from the dealer. So if nothing seems to be helping the idle after cleaning the throttle body, it most likely needs an ECM reflash and idle relearn at the dealership. Hope this helps.
+1
This is exactly what happened with my '07 G35x. I also ended up going to the dealer for a re-flash followed by a relearn, they only charged my 1.0 hours labor although In reality the car was done and ready in about 15mins.
As far as what causes this, I would say it's removing the dirt and carbon buildup in the TBs allowing more air through. Moving the butterfly, disconnecting the battery or harnesses is completely irrelevant.
I just did it on my 07 G35x 200,000 km (124,200 miles). I don't think any of the previous owners worked on it. I didn't have rough idle before. The idle RPM went from 600 to 800 so I will keep an eye on it next few days.
I didn't clean the butterfly flap or moved it at all. I also didn't disconnect battery and connector.
How's the results? Do I need to clean it more?
Before After
Last edited by Samuel Kwok; 06-23-2019 at 08:45 PM.
Reason: grammar
Check your idle speed with a scan tool if you have access to one. Or, make sure it's 100% warmed up because 800 is kinda too high. The proper value can range between 600-700. You might be there if you're just eye-balling the RPM gauge and guesstimating.
As far as cleaning it, I did mine and didn't get it as clean as I would have liked but what I did clean made a noticeable improvement. Without removing them entirely from the car, there's only so much you can do. Reason I cleaned mine is every once in a while, when coming to a stop, the idle would drop down to 400-500 (??? - a guess but the gauge clearly dipped and the car would stutter). After cleaning, it hasn't done it since.
I just did it on my 07 G35x 200,000 km (124,200 miles). I don't think any of the previous owners worked on it. I didn't have rough idle before. The idle RPM went from 600 to 800 so I will keep an eye on it next few days.
I didn't clean the butterfly flap or moved it at all. I also didn't disconnect battery and connector.
How's the results? Do I need to clean it more?
Before After
Try to do an idle relearn and see if it helps. I doubt it’ll go away with time.
Check your idle speed with a scan tool if you have access to one. Or, make sure it's 100% warmed up because 800 is kinda too high. The proper value can range between 600-700. You might be there if you're just eye-balling the RPM gauge and guesstimating.
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Originally Posted by Pete2734
Try to do an idle relearn and see if it helps. I doubt it’ll go away with time.
Thank you, I've done Idle Relearn and it's back to normal 650 on idle.
I see an instant improvement on mileage. When I release the pedal and roll to a stop, I've NEVER seen it goes 0L/100km, it has always been 5L/100km.
My city drive at 60km/hr hovers around 9-10L/100km compare with 12-13L/100km before cleaning.
Thank you, I've done Idle Relearn and it's back to normal 650 on idle.
I see an instant improvement on mileage. When I release the pedal and roll to a stop, I've NEVER seen it goes 0L/100km, it has always been 5L/100km.
My city drive at 60km/hr hovers around 9-10L/100km compare with 12-13L/100km before cleaning.
Cleaning a little carbon around the TBs wont magically gain you a 20% increase in MPG. But it does sound like you completed the re-lean and reset all parameters which is very good and that process perhaps did affect the MPG, rolling to a stop it should go to 0L then slowly climb as you reach the full stop.
Just got around to it this weekend - although it's my 4th time doing it, am surprised every time how much of a difference it makes as the car again is as smooth as buttah. Having an electric ratchet really speeds up the process (Milwaukee M12). TB cleaning has to be a yearly maintenance item.
11-19-2018, 06:27 PM
