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Discussion Starter · #1 · (Edited by Moderator)
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Heres the scenario, i have an '07 2.5L 6spd with 267K on the clock. At 3K RPM i get something between a miss and a studder, to me it feels like a lean condition. It doesnt matter if im light or heavy on the throttle it does it either way. Ive tried a different set of plugs, i cleaned the MAF and cannot find any vaccum leaks. No other operating issues.

Heres the strange part, if i disconnect the battery for a few minutes the problem goes away for a couple of days (or possibly a certain # of key cycles) then it comes back. I do have a bluetooth adapter and the torque app but im not sure what i should be looking for. I still average 30 mpg so whatever it is the mileage doesnt seem to be effected just the performance.

Any suggestions would be greatly appreciated.

Justin

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Discussion Starter · #3 ·
Thank you for you're very detailed reply. I will look at the live data then see if i can perform the IAVL. Im not sure if its a good thing or a bad thing but in the 155K miles (267K total) ive put on this car ive learned very little about it because nothing fails so only routine maintenance (oil changes, brakes, suspension, wheel bearings) gets done.
 

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Discussion Starter · #5 ·
Well i fired up the torque app and looked at the live data. Attached are two screenshots.

Driving 2nd Gear
Light Speedometer Gauge Tachometer Measuring instrument


Idiling
Speedometer Light Gauge Tachometer Measuring instrument


Looking through my torque app (android version) i dont see where i can perform the IAVL test, is there another way to do it? All of the "self tests" show green as passed.
 

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Discussion Starter · #8 ·
Well my findings are that the issue is still present and most noticeable in 3rd and 4th gears. Full disclosure i did not disconnect the negative cable (i didnt have time) before i started the accelerator pedal released learning so if thats necessary i will try the test again on Thursday or Friday.

I performed all of the tests after the car was up to operating temperature (40+ min of driving). Then drove for another 10+ minutes.
The LTFT is at least showing positive now. This was with the car stationary and the trans in neutral. SEL is not on and there are no stored codes.
Light Speedometer Gauge Tachometer Measuring instrument
 

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Discussion Starter · #9 ·
Update.
I still haven鈥檛 been able to track down the source of my 3K rpm stutter. Now that it鈥檚 getting cold outside the engine is acting up when I first start to drive. If the engine is really cold (like first thing in the morning) when I put it into gear and let the clutch out the car will sometimes buck and lurch for the first mile or two or until I鈥檓 above 1500 or 2K rpm with a steady load. Does anyone have any idea?
 

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Discussion Starter · #11 ·
I will check the o2 reading today and let you know what i find. In the mean time is there a brand of sensors (o2 or MAF) that you reccomend or any brands to stay away from?
 

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Discussion Starter · #15 ·
Im a backyarder but with two associates degrees in automotive. The "part swapper" mentality is not part of my order of operations. My other 3 vehicles are Fords, which im very knowledgeable about but this Altima just hasnt needed anything other than routine maintenance in the last 6 years and 155K miles so i havent needed to learn much about it.
 

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Discussion Starter · #16 ·
Attached is a screen shot of a 60 mph 6th gear flat ground cruise. The #1 02 sensor is no where near 2.2V and it doesnt really seem to change much when you accelerate.
Speedometer Plant Light Gauge Measuring instrument
 

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Discussion Starter · #17 ·
Heres another one, this is a 4th gear WOT pull. I added a couple more signals just in case. When i let off of the throttle 1.0V is about the max that i see on the 02 sensor.
Speedometer Light Gauge Plant Tachometer
 

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Discussion Starter · #24 ·
Well i changed the MAF and performed the IAVL setup last friday and everything was fine until today. Today on my way home after about 140 miles since friday the check engine light came on with a P0172 error and my 3K studder is back. Up until this point this issue has not caused the service engine light to come on. I ordered a Denso 02 sensor at the same time so tomorrow i may swap the original MAF back in and install the new 02 sensor.

Speedometer White Light Plant Gauge


Speedometer Light Gauge Measuring instrument Font


These screen shots were from my ride home in 6th gear with the cruise set on flat ground.
 

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Discussion Starter · #26 ·
So does it make sense to put the original MAF back in along with the new primary 02 sensor? The MAF was $30 so im not worried about the $$. Which ever MAF ends up in the car the other one will be a spare on the shelf.
 

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Discussion Starter · #28 ·
The only thing i was concerned about was the fact that ive been dealing with this issue for months and never had a SESL until i changed the MAF. I will try the new 02 but if theres any signs of an issue the original MAF is going back in.
 

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Discussion Starter · #30 ·
And the saga continues... I ordered a Denso upstream 02 sensor which got delivered a week or so ago. I went to install it and found that the electrical connector was wrong which after a quick search revealed my Michigan car has Commiefornia emissions. So i packaged that 02 up and sent it back and ordered the right one. The correct Denso showed up today and after 5 min or so was installed. Welp....same problem, the 3K rpm miss or studder or hesitation or whatever you want to call it is still there. Im starting to think that the issue is one of the ignition coils but its not throwing a misfire code so im hesitant to buy a coil and swap one by one to see if it changes anything.
 

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Discussion Starter · #32 ·
I do or did have one tube seal that was very slightly leaky. I bought a kit to replace the tube seals but when i got the valve cover off i found that they were molded in and couldnt be changed.

If i order a coil is there a brand to buy or any brands to stay away from?
 

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Discussion Starter · #35 ·
Ok thanks, ill see if i can find a Hanshin or a Denso. Good to know about the rocker cover, ill investigate that when i get into the ign coils.
 

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Discussion Starter · #38 ·
Well what i figured would happen happened, the coil didnt alter the performance of the car. I started at cyl #1 and swapped each of the existing coils with the new Denso coil one by one. So im back to the drawing board.
 
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