Exhaust soot on one tip more than the other.
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Registered User
Joined: Dec 2011
Posts: 1,512
From: Illinois
Rep Power: 132
Exhaust soot on one tip more than the other.
Noticed tonight the right tip has way more exhaust soot than the left. It's usually about even. Car runs and idles perfect. Concern?
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Joined: Jun 2009
Posts: 2,190
From: Benton County, AR
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If you have the equipment, an OBD2 code reader/data viewer, you can read/view the short term and long term fuel trims to see if one bank -- the "sooty" one -- is getting a richer mixture.
If there is a significant difference it might be due to the O2 sensors are due to be replaced.
The soot at my Turbo's exhaust outlets has been pretty much the same since day #1 but at around 131K miles an O2 sensor error appeared upon a hot start. No other errors and the engine was fine. I drove home -- from Barstow to Livermore -- and every time I restarted the engine after filling the tank the error would reappear. As soon as I got home and as soon as I could I booked the car in and had all 4 O2 sensors replaced. This eliminated the error code and the engine passed smog emission testing just fine.
But also the engine perked up some after the O2 sensors were replaced. I had replaced the sensors of my Boxster more than once and never noticed any change in the Boxster engine's behavior.
However, the #1 sensors of the Turbo are wide band in order to ensure more precise fueling and if these are degraded even if they are not triggering a CEL the engine fueling can be subpar. This could (could) account for the difference in soot levels at the exhaust outlets.
But do not forget that there is a converter between the engine and the exhaust outlets and any soot differences could reflect more on the performance/efficiency of the converter rather than the engine.
Thread Starter
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Registered User
Joined: Dec 2011
Posts: 1,512
From: Illinois
Rep Power: 132
No untoward engine behavior. No CEL. No problem. Maybe.
If you have the equipment, an OBD2 code reader/data viewer, you can read/view the short term and long term fuel trims to see if one bank -- the "sooty" one -- is getting a richer mixture.
If there is a significant difference it might be due to the O2 sensors are due to be replaced.
The soot at my Turbo's exhaust outlets has been pretty much the same since day #1 but at around 131K miles an O2 sensor error appeared upon a hot start. No other errors and the engine was fine. I drove home -- from Barstow to Livermore -- and every time I restarted the engine after filling the tank the error would reappear. As soon as I got home and as soon as I could I booked the car in and had all 4 O2 sensors replaced. This eliminated the error code and the engine passed smog emission testing just fine.
But also the engine perked up some after the O2 sensors were replaced. I had replaced the sensors of my Boxster more than once and never noticed any change in the Boxster engine's behavior.
However, the #1 sensors of the Turbo are wide band in order to ensure more precise fueling and if these are degraded even if they are not triggering a CEL the engine fueling can be subpar. This could (could) account for the difference in soot levels at the exhaust outlets.
But do not forget that there is a converter between the engine and the exhaust outlets and any soot differences could reflect more on the performance/efficiency of the converter rather than the engine.
If you have the equipment, an OBD2 code reader/data viewer, you can read/view the short term and long term fuel trims to see if one bank -- the "sooty" one -- is getting a richer mixture.
If there is a significant difference it might be due to the O2 sensors are due to be replaced.
The soot at my Turbo's exhaust outlets has been pretty much the same since day #1 but at around 131K miles an O2 sensor error appeared upon a hot start. No other errors and the engine was fine. I drove home -- from Barstow to Livermore -- and every time I restarted the engine after filling the tank the error would reappear. As soon as I got home and as soon as I could I booked the car in and had all 4 O2 sensors replaced. This eliminated the error code and the engine passed smog emission testing just fine.
But also the engine perked up some after the O2 sensors were replaced. I had replaced the sensors of my Boxster more than once and never noticed any change in the Boxster engine's behavior.
However, the #1 sensors of the Turbo are wide band in order to ensure more precise fueling and if these are degraded even if they are not triggering a CEL the engine fueling can be subpar. This could (could) account for the difference in soot levels at the exhaust outlets.
But do not forget that there is a converter between the engine and the exhaust outlets and any soot differences could reflect more on the performance/efficiency of the converter rather than the engine.
Interesting...just realized my o2s are still factory ones, and I have 105k miles. Lol
log and log... 
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2001 996TT 3.6L and stock ECU
9.66 seconds @ 147.76 mph 1/4 mile click to view
160 mph @ 9.77 seconds in 1/4 mile click to view
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
2001 996TT 3.6L and stock ECU
9.66 seconds @ 147.76 mph 1/4 mile click to view
160 mph @ 9.77 seconds in 1/4 mile click to view
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
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