Engine codes
#1
#2
#3
#4
2-3-1: P0171, P0172: Long Term Fuel Trim Part Load
2-3-2: P0171, P0172: Long Term Fuel Trim Idling
4-3-3: P0422 TWC Efficiency
I would like to know the colour of the smoke out of the tail pipe. If dark gray/black, A/F mixture is too rich due to a fault in the fuel control/faulty O2 sensors. If the smoke has a hint of blue, oil is burning.
JPN
2-3-2: P0171, P0172: Long Term Fuel Trim Idling
4-3-3: P0422 TWC Efficiency
I would like to know the colour of the smoke out of the tail pipe. If dark gray/black, A/F mixture is too rich due to a fault in the fuel control/faulty O2 sensors. If the smoke has a hint of blue, oil is burning.
JPN
#6
I have a 1995 Volvo GLT. I recently changed the spark plugs to (Autolite platinum), fuel filter ( an aftermarket brand) and air filter. Shortly after, I found the car ran smooth but the power seemed slightly less. I guess I expected a little more... Then I noticed my ability to accelerate was definitely not as good as before. I assumed the fuel injecters needed cleaning and added some GUMOUT fuel injector cleaner --- still no improvement.
Finally, I plugged in my diagnostic MEMOSCAN. It gave two codes: P0172 "Fuel mixture too rich" and P0422 "Cat..." My MEMOSCAN gives both the codes and verbal explanation.
My questions are:
1) Since the problems occured after changing the plugs, fuel filter and air filter did one of them cause the problem?
2) I had used fuel injector cleaner several times in the last sevral months. Is this contributing to the problem?
3) I am currently using 93 octane gas. If I drop it down to 89 octane will that help fix it?
Note: I am on the East Coast. We have 87-89-93 Octane ratings at our gas stations. I know that other States may use a different octane ratings for the same gas: 85-87-91
Finally, I plugged in my diagnostic MEMOSCAN. It gave two codes: P0172 "Fuel mixture too rich" and P0422 "Cat..." My MEMOSCAN gives both the codes and verbal explanation.
My questions are:
1) Since the problems occured after changing the plugs, fuel filter and air filter did one of them cause the problem?
2) I had used fuel injector cleaner several times in the last sevral months. Is this contributing to the problem?
3) I am currently using 93 octane gas. If I drop it down to 89 octane will that help fix it?
Note: I am on the East Coast. We have 87-89-93 Octane ratings at our gas stations. I know that other States may use a different octane ratings for the same gas: 85-87-91
Last edited by NCdad; 08-11-2010 at 12:22 PM. Reason: spelling error
#7
#8
Code P0172 and P0422 -- Which spark plugs should I use ?
Thank you Gdog !
I kind of suspected it might be the spark plugs. I never used the Autolite platinum plugs before, but since they were 'platinum' I thought they would be better. Which spark plug brand and type do you recommend ? I will change the plugs first, and then the filter - if the problem persists.
I kind of suspected it might be the spark plugs. I never used the Autolite platinum plugs before, but since they were 'platinum' I thought they would be better. Which spark plug brand and type do you recommend ? I will change the plugs first, and then the filter - if the problem persists.
#9
Bosch Platinum or OEM; also make sure they're gapped properly...
https://volvoforums.com/forum/showth...ed+spark+plugs
https://volvoforums.com/forum/showth...ed+spark+plugs
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