Stuck in Open Loop
Thread Starter
Racer
Joined: Jul 2004
Posts: 389
Likes: 2
From: Howard Beach, NY
Stuck in Open Loop
My '87 runs pretty good except it seems to stay in open loop
I set the minimum air, set tps to .56 and checked it out on the scanner
coolant temp is about 185f / 85c but the oxygen sensor voltage wont budge from .36 volts
do i need a new oxygen sensor or is there some other issue somewhere?
I set the minimum air, set tps to .56 and checked it out on the scanner
coolant temp is about 185f / 85c but the oxygen sensor voltage wont budge from .36 volts
do i need a new oxygen sensor or is there some other issue somewhere?
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Thread Starter
Racer
Joined: Jul 2004
Posts: 389
Likes: 2
From: Howard Beach, NY
Thread Starter
Racer
Joined: Jul 2004
Posts: 389
Likes: 2
From: Howard Beach, NY
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
If it stays in open loop, the engine cooling temp sensor that feeds the computer is what makes the ecm fall back into closed loop, not the oxygen sensor.
the difference between closed loop and open loop is temperature.............
the difference between closed loop and open loop is temperature.............
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Thread Starter
Racer
Joined: Jul 2004
Posts: 389
Likes: 2
From: Howard Beach, NY
but ill go back and read the book just in case!
i was always under the impression the heated o2 sensor was mostly for idle since under load the exhaust gets more than hot enough to get the oxy sensor going
Pro
Joined: Oct 1999
Posts: 515
Likes: 0
From: Nashua NH
the tip of the sensor needs to get up to 600 degrees to work properly...the only place a non heated sensor would see that temp is right at the exhaust port...thats why stock manifolds have the bung there...
