code 41, various reasons for
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From: Calverton
code 41, various reasons for
On my 92 302 I get the code 41, it seems like it's more of a problem during the heat of the day. The truck just runs poorly during that time with a continuous engine light on. How many possibilities are there as to the cause of a code 41...thanks for any help
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From: Calverton
Thank's, could you explain why it would run good while cooler, and then run poorly later on.
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From: Ottawa, Ontario
At cold startup the computer runs in open loop on the factory programmed tables which are rich, once it hits operating temp it goes closed loop and uses feedback from the O2 to set the mixture. If the O2 sensor is working properly this would indicate there is an uncontrolled air leak into the exhaust that is making the mixture look lean, but this would also mean that the computer is at the rich adaptive limit and there would be a rich smell from the exhaust and gas milage would be poor. Do you have that problem? If not and instead the motor seems to run lean with poor power and a stumble or miss(plugs are white) it is possible that the O2 sensor is bad and is giving the computer bad info. When was the sensor last changed?
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From: Calverton
quote
When was the sensor last changed?
I have not changed it in the 3 years that I have owned it. Only one of the two sensors is connected, someone cut the leads off of one of them. I recently check the gas milage the other day it was 16 to the gal, but yesterday I'm sure it was poor, thanks again
quote
motor seems to run lean with poor power and a stumble or miss
that sounds like it, just started that yesterday
When was the sensor last changed?
I have not changed it in the 3 years that I have owned it. Only one of the two sensors is connected, someone cut the leads off of one of them. I recently check the gas milage the other day it was 16 to the gal, but yesterday I'm sure it was poor, thanks again
quote
motor seems to run lean with poor power and a stumble or miss
that sounds like it, just started that yesterday
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From: Calverton
Thank you, what are the thermactor and CANP?...do you think that heating of the day would affect any of the 7 items that you listed? I guess that I need both oxygen senors connected as well?...thank you again
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From: Easton,Ks
The heat of the day problem may be the air intake temp sensor or the water temp sensor.
Or it could be a fuel problem with low fuel pressure. That may be a fuel pump going bad and that could generate the 41 code.
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