Sometimes rough idle

[Helium2]

2010 Rogue

While sitting at a red light I notice the engine misses a bit and the idle drops to 500-600 rpm for a few seconds.
Then the engine smooths out and the rpm raises.
This happens 1-2 times a day nearly every day...but not always.

Whats up?

[ImStricken06]

I HAVE IT TOO. you could try and clean your MAF sensor, but i think this is the characteristics of the MAPs in our ECU

[myriad46]

Same here. In addition, it seems like it takes an extra crank or 2 to start. You get trained to turn the key for a certain amount of time and the engine starts. More frequently in the past couple of months, I end up missing it, and I let go before it catches and have to turn the key again. That and the occasional rough idle seemed to start around the same time.

[Helium2]

"I HAVE IT TOO. you could try and clean your MAF sensor, but i think this is the characteristics of the MAPs in our ECU"

Could you elucidate?

[TrevorK]

Provided it is not something as simple as your AC kicking in (or some other load on the system), then what you are describing is not normal.


I would recommend getting the Service Manual (should be a link somewhere on this site). It has a complete diagnostic listing of what the dealer would do, and the order they are supposed to do it in. For example, if your problem is labelled as "Rough Idle" it recommends (in order):
1) Check battery/charging system
1) Incorrect idle speed adjustment
1) Incorrect ignition timing adjustment
2) Check the IVT Control Solenoid Valve
2) Ignition circuit
etc...

It provides the spec's for you to check (for example, the resistance to expect on the IVT from #2). It sounds like a lot of work because you do not have the CONSULT, which I assume makes it a million times quicker, but it gives you an idea of what Nissan recommends checking and in what order they recommend checking it. If you feel you have multiple problems, you could look for which ones exist in both lists and pick the ones that are both #1's. At least this will give you a starting point, and with the manual, the proper way to perform the tests and repair.

[Helium2]

I suppose it could be the A/C kicking on. I hadn't thought of that.

The rest of those possible causes don't seem to to me to relate to an occasional rough idle.

I'll pay a little more attention to see if it occurs when the A/C is on.
Thanks.

[ImStricken06]

YOU CAN TRY MY NEW DIY: post6653416.html

[TrevorK]

I suppose it could be the A/C kicking on. I hadn't thought of that.

The rest of those possible causes don't seem to to me to relate to an occasional rough idle.

I'll pay a little more attention to see if it occurs when the A/C is on.
Thanks.

Yes - most of the problems would typically be an always rough idle. But if you go through the manual you might find something of interest in their troubleshooting parts.

Remember that the AC is on when the defroster and that runs too (even if the light does not indicate it). Just in case you are one of those people that just leaves it to the front defrost all the time (nothing wrong with that at all - not what I am implying).

[Helium2]

Yes - most of the problems would typically be an always rough idle. But if you go through the manual you might find something of interest in their troubleshooting parts.

The problem I have with the on-line copies of the manual is they all seem to be 1 chapter pdf's that have no clear title to indicate what they cover.
I have enough grunt work in my life without going through & renaming all those pdf's.

[Phillyrogue]

i have this rough idle. while i was getting ready to charge a/c system, the rough idle came for a second while i was under hood and i was able to see that the belt was wobbling alarmingly, than went back to normal as idle smoothed out.

donno if that helps diagnose problem any but just another piece to the puzzle

[Helium2]

did the A/C kick in?

[TrevorK]

Yes - most of the problems would typically be an always rough idle. But if you go through the manual you might find something of interest in their troubleshooting parts.

The problem I have with the on-line copies of the manual is they all seem to be 1 chapter pdf's that have no clear title to indicate what they cover.
I have enough grunt work in my life without going through & renaming all those pdf's.

Download all the PDFs into one folder. Open "fwd.pdf" - it is the table of contents, clicking on links within the table of contents opens up the appropriate PDF for you.

I was half-way through labelling them myself (alphabetical order) and opened "fwd.pdf". I swore a bit when I realized that was all I ever needed to open

[Helium2]

Download all the PDFs into one folder. Open "fwd.pdf" - it is the table of contents, clicking on links within the table of contents opens up the appropriate PDF for you.

I was half-way through labelling them myself (alphabetical order) and opened "fwd.pdf". I swore a bit when I realized that was all I ever needed to open

Thanks!