Rough Idle

[KC_Canuck]

Anyone else with a rough idle? When my truck is warm and idling at a light the rpm's dip slightly and the idle becomes rough enough to feel vibration in the steering wheel and cause a droning low freq type sound in the cab. Once the idle dips, it stays at that rpm indefinately.

The dealer has re-learned the idle speed? , but this has not fixed the problem. I am bringing it in next week again but if anyone else has had a similar problem, any info would be greatly appreciated.

[Jack]

Hey KC-Canuck - I have the exact same thing happening with my '05 LE. I've posted about it here: http://www.clubfrontier.org/modules....ewtopic&p=5837. Maybe it's a Canadian thing (I was born and raised in Nova Scotia)...

I do have a theory though as to why this is going on - have you changed the oil in your truck and replaced the oil filter with a non-OEM one? I'm wondering if there is something in the OEM oil filter that helps keep the pressure up...

[KC_Canuck]

No, i've always used oem filters. I just brought it in for the second time yesterday. They told me too much oil can cause this sort of problem but they checked it and it was ok.

It seems to be worse when the a.c. is on when I have the dial set to defrost. I've also noticed something else which makes no sense. When the rough idle occurs I then turn on the side mirror heater button and the engine smooths right out!

They phoned nissan tech and they suggested a few things (details unknown) but the problem still persists which they admit. They will be contacting nissan again monday for further ideas.

I'll keep ya posted.

[Jack]

Well, so much for that theory... That's really weird about the mirror heater though -- I've never been able to find a way to smooth the idle out. I'll be watching for your update.