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I am going to take a shot in the dark and see if anyone else has had this issues. I own a 2011 Nissan Altima 2.5 SL that has an intermittent cold idle surge. My car has about 49,500 miles on it. It seams to happen more when it’s above 40-45 degrees on a cold start during the initial high idle period. It normally does it once where it feels like a quick surge/misfire; a fast drop in RPM. It normally does it once but today it did it 3 times about 5 seconds apart and felt like it was going to stall. It cleared up and ran fine after that. Now today it was raining. The other day I disconnected my battery to clean the terminals and it did the same thing at a stoplight after the car was already warmed up. I assumed it was still going through the idle re-learn process after having the battery disconnected. The car as always had this single sure miss at cold/high idle above 40-45 degrees that only happens once but, recently has gotten worse.
There are currently no codes in the computer. There was once stored code in the computer when I first bought the car 2 years ago referring the a OS sensor delay. I cleared the code and currently has not check engine lights or stored codes. Any ideas? Thanks.
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typically when your car is running funny during a cold start or when cold it has something to do with some sort of temperature sensing… during a cold start the PCM will set the engine to run rich for cold starting, a cold engine likes a rich mix… if it doesn’t know the engine is cold, it can’t set it rich, before we assume though lets do some diagnosis.
Do you have a engine light any codes, what does your temperature gauge say? sometimes when your coolant temperature sensor goes on the fritz your temperature sensor will go everywhere or will not read anything.
I currently have no check engine light and no codes or stored codes. I watched the live data on my diagnostics tool and saw nothing out of the normal. The only thing I did notice was bank 1 sensor 3 O2 Sensor readings where not fluctuating. It maybe possible this vehicle doesn’t have this sensor. Just odd that the diagnostics tool was looking for it.
I also want to add that the slight jolt, miss or surge not sure of the best term to describe it only occurs once during first morning start up while idle is high and usually happens with in the first 10 seconds. The only time I have noticed it do it the three times in a row is after it has rained out and sat over night. When it gets below approx. 40 degrees it doesn’t do this at all at cold start idle. Only when above approx. 40 degrees. Sometimes the engine feels to be running slightly rough even when warm at a stop light. Nothing major just a little vibration from the engine like its not idling as smooth as it normally does.
The temperature gauge reads accurate and I cross referenced it with the live data readings on my diagnostics tool and it looks right on par.
Other than this the car run great! I love the car. It has been extremely reliable, good on gas, doesn’t burn or leak any oil, lots of power and doesn’t eat of brake pads like my GM’s did.
My brother has a 2012 Altima with same engine and his doesn’t do it at all. Slightly lower millage though but, mine has done it since I purchased it two years ago with 30,000 miles.
I’m thinking it may need the throttle body cleaned.
thanks!
Today something new. When coming to a stop in my Altima it Sputters and tries to stall out. Once again it’s 48 degrees out, in that temperature band it acts up.
It’s not actually stalling, it catches it’s self before it does. I took it out on the highway and opened it up and it stopped doing it. I just feel that there is still something wrong because some days it’s fine and others it acts up some what or acts of really bad.
I recently had the battery disconnected to clean the terminals but that was almost 500 miles ago. I figured buy now it would have fininshed all the drive cycles. My buddy that’s. Mechanic suggested I disconnect the batter and clean the throttle body and then drive it again to see if that helps. He says on the new cars with the electronic throttle body can have a hard time completing the relearn process after having batter disconnected if the throttle body is dirty.
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