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Frozen O2 and cc

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TryMeGT

Member
Joined
Dec 17, 2002
Messages
255
I am at a loss. Suddenly (last night after work) my car wants to stall driving home. I check my o2's and cc's while driving after I start it back up and they are frozen at 933 and a cc of 1. It stays that way for about a minute and then they go back to normal cc's and O2's. But at a red light they want to slow down and freeze in a rich condition. Sometimes it will stall. After I get it home, I start it up again. 933 and cc of 1 for about a minute. It has done this every time since yesterday that I have started it. It is a Denso O2 with less then 2000 miles on it and only 10-15 gallons of 110 run through it. Just put the street chip back in on Tuesday and the only other condition that has changed is that we got a terrential downpour of rain while I was at work yesterday. Problem occurred after that. I normally do not drive the car in the rain but my daily driver (a Ford) is down till I get it fixed. Maybe I have not paid attention, but I have never seen my O2's frozen, even when I had a lazy AC sensor. The integrator is working when the O2's freeze. Could this be bad gas, water, need to reseat my chip. I tapped on the MAF while idlingl but no change in idle. Car will eventually stall if I don't keep my foot on the gas. O2's and cc's will freeze when coming to a stop also. Not always 933, but at least in the 700-800 range Any clues or suggestions to what is going on? TPS is .46 and IAC is around 15 +/- 5. Could the car be in closed loop even though the temperature is 150` +/. Any help is greatly appreciated.:confused:
 
Frozen O2's

May sound strange but I had the same problem when my maf sensor went out. Maf sensor readings appeared to be normal but O2's would freeze. Swapped with a known good sensor, bingo! cross counts back to normal.
 
Problem self corrected. It must have been the really bad rain. Today was sunny and nice. Something must have gotten wet and it dried out because it ran fine this evening.
 
Did anyone figure out what was the cause of this????

I drove today in a lot of rain. After getting home my car sat for a couple of hours. I ran down the street and it is doing the exact same thing you described.

Is it the MAF sensor or an O2? The mass air flow on the scan master seems normal so I was about to order a new O2, one way check valve and a new PCV just incase oil was causing the weird O2 readings and rich ness.

I wasn’t thinking it had anything to do with the rain but after reading this who knows!
:confused:
 
Fixed! The problem was moister got to the area where the computer is, and that caused corrosion on the harness/computer connections. One of the corroded pins happened to be for the O2 sensor. I wasn’t able to find any water so this may have been happening over time and yesterdays rain just finished it off.

Big thanks to Eric (TurboTweak) for giving me a few new ideas to think about. That saved me $75.00. I had ordered a remanufactured MAF and was going to pick it up tomorrow hoping that would fix the problem.

:)
 
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