2001 q45 Surging idle only when Cold only...

[thattori1959]

Hello all, I'm new here an having problem with my Q, at the moment is at our local Nissan/infiniti specialist and they cant figure the problem..Here's the SYMPTOM ....... 2001 infiniti q45, surging idle up and down sometime trying to stalled out when cold...no CEL, and when warmed up to normal operation temp. it will run great until the next cold start. Local nissan specialist working on it today, new MAF, re set the computer along with some other adj. Still have the symptom? any ideas or Did any one have the same problem and fixed ..Thanks

[thattori1959]

PS. they are suggest to take to the Dealer and have it dianostic through the Dealer "Assist" computer????

[94Q45Beast]

i had those symptoms when there was a problem in my cooling system

[thattori1959]

we just install new radiator a few weeks ago...no over heating problem.. How did you dianostic that symptom was relate to your cooling system...Thanks

[94Q45Beast]

well, for me, I had the same symptoms after my first KS job, so my thinking was that if it happens on a cold engine, then fade when it warms up then it has to do with the temperature change, thus something in the cooling system....it worked for me, my issue was a bad Coolant Temperature Sensor....don't know if that's your case, even though I had the same symptoms, but worth giving a look at.