1jz cold start fluctuating idle issue
01-22-07, 07:13 PM
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cold start fluctuating idle issue
there seem to be tons of idle issues threads out there so it made it difficult to weed through them for the correct answer, but I have a 1jz/auto ecu in my 92' 5spd sc300, it has been and still runs smooth and fine, but recently when i start it (even if its on a warm afternoon but its the first time that day the engine is started) the RPM fluctuates at idle until the engine warms up.
the most recent mod i did to my car was replacing the cat with a cut-out, leaving the O2 sensor that goes into the cat just under the car not in the exhaust system.
thanks
the most recent mod i did to my car was replacing the cat with a cut-out, leaving the O2 sensor that goes into the cat just under the car not in the exhaust system.
thanks
Last edited by sc1jzgte; 01-27-07 at 11:33 AM.
01-27-07, 07:20 PM
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the o2 sensor that plugs into the cat, i replaced the cat and the just hooked it up underneath the car, its basically hanging under my car in the outside atmosphere
01-29-07, 02:47 AM
#6
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The O2 sensor shouldnt be a problem. The reason why the idle is unstable is because your tune is a bit off. Whenever that happens, it means the car is running rich in closed loop.
I would try resetting your ECU, or adjusting your tune with your AFC if you have one. But normally all heavily modified cars have this problem in closed loop, including mine.
I would try resetting your ECU, or adjusting your tune with your AFC if you have one. But normally all heavily modified cars have this problem in closed loop, including mine.
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