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its the RAR valve.

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Q: Engine idlesup and down at cold start on 92 geo tracker what could it be?
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How or could you turn over an engine on a geo tracker manually?

If the tracker is a "standard shift" not automatic transmission. You could pop start the engine by putting the car in 1st gear, with the clutch pedal down and the ignition on. Roll the car and once car is rolling release clutch pedal. Vehicle should start, hope this is what you ment by "manually".


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