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Old 08-08-2005, 10:56 AM   #1
e_a_olson
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Member#: 7034
Join Date: May 2001
Chapter/Region: NESIC
Location: Newtonville, MA
Vehicle:
2005 Nissan Altima
2.5SL - Black

Default CEL P0328 fixed, now pulling P0172

So I replaced the knock sensor and spark plugs because I was pulling a P0328. There was no CEL for about 100 miles after changing the knock sensor, and then on the highway, the CEL came back on. My wife said she noticed a "drumming sound" comming from the rear of the car. I listened for it and hear it as well. Pulled into Autozone and had the code pulled, and it was P0172: Fuel trim malfunction (A/F too rich). I figure the "drumming" sound is the popping of unburnt fuel hitting the cats, right?

What are the best things to check? Plug gap? Secure the plug wires? Secure the vacuum hoses? Clean the air filter (K&N panel filter was cleaned about 3 months ago - 5000 mi)?
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Old 08-08-2005, 03:34 PM   #2
abosworth
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Location: NoVerm Brah......
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2012 Speed3
Red Mica

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If the fuel air mixture is incorrect then i would guess that the O2 sensor is bad. what kind of car is it? or maybe check to see if the fuel pressure is correct.
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Old 08-08-2005, 05:19 PM   #3
e_a_olson
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Join Date: May 2001
Chapter/Region: NESIC
Location: Newtonville, MA
Vehicle:
2005 Nissan Altima
2.5SL - Black

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I cleared the code today, and it has not returned yet. I also no longer hear the unburnt fuel hitting the cats.
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