NorCal FJs

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Not sure if this is normal, but my FJ will idle normally, but when I turn on the fan it'll idle @ 8-900 rpm for a few sec. than drop back to normal than up again as long as the fan is on.

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I have had mine do that for time to time.... how long between cycles?
10-15 sec normally idling than it'll rev up for about 5 sec than back.
Is your defrost on? Maybe the AC is kicking in.
Ac and defrost off. Inconsistent idling only happens when I use the fan, other than that car idles normally when fans r not in used.

I noticed that my idle fluctuates a little some times too but i think that's normal.

Does it when I'm pulling into my car port. I think it could be compensating for drag from the power steering pump.

Maybe.

 

I doubt its nothing serious, just wondering if anyone noticed it.

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