1995 Volvo 850 non turbo OBDII Code PO179

[roadmaster99]

Hello, the check engine light came on my car about a couples of months ago. At first the light would come on while at idle or low speeds like 15mph then it would come on even on the highway. I purchased a scanner to obtain code and found PO179 Engine running rich, bank one. Here is what I had done to address this. Based on some info that I found on the OBDII website about this code, I have replaced the front 02 sensor and have had all the vacuum leaks checked and fixed and the light still comes on. At this point I do not want to keep spending money on something that does not fix the problem. Any other suggestions on this issue? Roger Baltimore MD. Oh by the way the scanner that I purchased only captures freeze frame data
and not real time. Hope this helps.

[regent]

Did you clean your MAF sensor; it may be possible that the output signal from it is out of cal (it first developed in the low range, and now at WOT); the ECU will therefore account for more air than the engine really gets, and you actual Fuel to Air Ratio would be rich. (Cleaning the MAF would be an inexpensive fix.)

[confused_al]

Based on some info that I found on the OBDII website about this code...

Since your car is 95, OBD I ports will give you more detailed info.
Here is how:
http://volvospeed.com/volvo_repairs_how ... es_a2.html
How to in video:

More info...
https://www.matthewsvolvosite.com/forums ... hp?t=10758

[roadmaster99]

Did you clean your MAF sensor; it may be possible that the output signal from it is out of cal (it first developed in the low range, and now at WOT); the ECU will therefore account for more air than the engine really gets, and you actual Fuel to Air Ratio would be rich. (Cleaning the MAF would be an inexpensive fix.)

The MAF sensor is new, only a few months old so I do not think it is dirty already. I will try to retrieve the codes from OBD1. I keep forgeting that I have the best of both worlds on this model. Thanks,
Roger

[roadmaster99]

Hello, the check engine light came on my car about a couples of months ago. At first the light would come on while at idle or low speeds like 15mph then it would come on even on the highway. I purchased a scanner to obtain code and found PO179 Engine running rich, bank one. Here is what I had done to address this. Based on some info that I found on the OBDII website about this code, I have replaced the front 02 sensor and have had all the vacuum leaks checked and fixed and the light still comes on. At this point I do not want to keep spending money on something that does not fix the problem. Any other suggestions on this issue? Roger Baltimore MD. Oh by the way the scanner that I purchased only captures freeze frame data
and not real time. Hope this helps.

02-18-2012
I checked the OBD1 codes and found 233 and 232 I looked the codes up on Volvo Speed and this is the info that I got.
Idle Aiir Trim Exceeds Control Limits Long Term Fuel Trim at Limits at Idle. Can any one tell me what does this mean?
Roger

[roadmaster99]

Hello, the check engine light came on my car about a couples of months ago. At first the light would come on while at idle or low speeds like 15mph then it would come on even on the highway. I purchased a scanner to obtain code and found PO172 Engine running rich, bank one. Here is what I had done to address this. Based on some info that I found on the OBDII website about this code, I have replaced the front 02 sensor and have had all the vacuum leaks checked and fixed and the light still comes on. At this point I do not want to keep spending money on something that does not fix the problem. Any other suggestions on this issue? Roger Baltimore MD. Oh by the way the scanner that I purchased only captures freeze frame data
and not real time. Hope this helps.

[Pauloil]

you may have a hole in intake hoses or a vacuum line off or leaking. could do a smoke test if you know someone with machine