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Toyota Forum: 2005 Toyota Matrix low/high cold idle
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Old 10-17-2016, 11:48 AM
Razorbil Razorbil is offline
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Join Date: Oct 2016
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Default 2005 Toyota Matrix low/high cold idle

Good morning all. I have a 2005 Toyota Matrix (base), 85,000 miles, manual.

Regardless of outside temp, when I start the car the engine will high idle at ~2800rpm, then immediately drop to ~800prm, then back up/down/up/down repeatedly until the engine is warm. I was totally expecting the car to high idle until warm (start ~2800, then slowly drop to 1000ish), but I've never had one that went high, then immediately dropped and bounced back and forth until the engine fully warmed.

Ideas? Thanks in advance for the help.
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