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1996 Honda Accord stft %60 Ltft 0?

Old 03-10-2019, 04:54 PM
Thread Starter
Join Date: Mar 2019
Posts: 9

So with my latest readings you can see that it is all over the place. I went through the o2 wires under the car and the plug was tight. I went ahead an cleaned the contacts with electrical cleaner and reattached them all. It seemed to work good for about 2 minutes until it warmed up. When the sensor got hot it seems like it started going crazy again.
intake temp was like 135F when I looked.
coolant was at 210F
Old 03-10-2019, 07:40 PM
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Join Date: Sep 2006
Location: Houston, TX
Posts: 13,050

The intake air temperature should be close to the outside air temperature maybe slightly warmer. Check that the IAT connector has a red/yel and a grn/blu wire going to it. Unplug the IAT and check that there is no corrosion on the connectors. Check the wires as best you can for obvious damage or shorting. If you unplug the IAT, the scanner should read the intake temperature as 302 F.

You can also do some resistance tests across the pins of the IAT sensor. The resistance at 32F should read 5,000 ohms (5 kohm). At 104F, the resistance should be 1,000 ohms (1 kohm). The scale is linear, so the reading will be 1 kohm less for every 18 degrees above zero. So 50F would be 4 kohm, etc.
Old 03-11-2019, 10:34 AM
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Super Moderator : And A Texan
Join Date: Feb 2007
Location: Katy, TX
Posts: 9,651

Coolant temp of 210F is excessive. Low coolant or bad thermostat.

good luck
Old 03-11-2019, 01:36 PM
Thread Starter
Join Date: Mar 2019
Posts: 9

Thank you for the suggestions. I will check the iacv pins and the thermostat as soon as I can. I got a super cold last week and was stuck in bed for a while. As soon as I can , I will update you all on the status of the tests.
Old 03-30-2019, 10:04 PM
Thread Starter
Join Date: Mar 2019
Posts: 9

Well I did the resistance test and everything checked out. The car has been running fine for the past week and stft has bee +-7%. I have no idea what was going on but it seems to have "fixed" itself. I appreciate all the help and suggestions. I just really wish I figured out what was going on but I'm guessing I will have another chance soon enough.
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