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Question
varunatech
Experts, I am trying to zero down on a problem shown by a Toyota 1NZ-FE engine at cold starts. Following is the background.
Engine: 1NZ-FE 1.5l YOM 2003 110k kms.
Air Filter: New
Tuning: Recently done
Throttle Body: Clean
MAF Sensor: Clean and ok
Plugs: Good
Fuel Consumption: Normal and Good
Engine Oil: Toyota, good condition
Overall: Well maintained
Fault Codes: No Fault Codes
Symptoms: "ONLY" on "some" cold starts, the engine revs to 2200 to 2400 RPM. And get settled after warm up.
Mind you this is NOT the usual engine warm up and self diagnostic routine, where RPM goes to 1800 and later settles. Please rule out that. This high RPM is beyond that.
And I detected a pattern after reviewing that this happens when and only car sits for more than 24 hours. If the car runs everyday and long distance, everything is ok.
Beyond this the user says at rare intervals and in traffic the engine try to go lower than 600 RPM and then kicks back. And this is rare.
Please comment.......with your views.
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