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strange cold start up?


rboat88h
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I have a 97 pathfinder 4x4 3.3L with only 73,000 miles on it. It has always done this so I just thought it was normal. On only cold starts, it starts right up, then drops idle down to almost a stall and then comes back up to a normal idle. I have changed plugs, cap & rotor & wires. Cleaned throttle body and mass airflow sensor. Still does it. My tach is shot so I do not know how low it drops, before returning to a normal idle. Any ideas? Thanks.

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Throttle body and MAF would've been my first checks too. I don't know the 3.3 idle control system very well, but that's what I would check next. There's a wax motor that is supposed to crack the throttle open for fast idle when cold. EC-27 and 28 in the '97 manual show a procedure to check and adjust it. There's also an idle control valve controlled by the computer, but if that was going I think you'd have issues all the time, not just on cold starts.

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