Very high idle
09-23-2018, 01:22 PM
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Model: Cherokee(SJ)
Very high idle
I got a 87 Jeep Comanche base 4.0 when it's cold it will idle fine but when it warms up the idle goes 2000 to 3000 rpm if I hit the gas it might drop dowm to about 1500 but as soon as I take off it zooms right back up I cleaned and replace throttle body new t.p.s 02 sensor bout ayear old upgraded to a 428 e.c.u I installed one hole injectors from 89 xj checked vacuum lines but can't figure this thing out it takes bout 3 or 4 seconds to start but it always been that way my diagnostic machine says it's running rich and don't change could it be the o2 sensor not working
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