System too lean codes. Thoughts?
03-06-2008, 09:37 PM
#1
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System too lean codes. Thoughts?
Intermittent problem for the past 10 months. Mods in sig, APR chip has stock, 91, and 93 programs. 17544 code is triggered in all modes under full acceleration.
Codes and details:
Tuesday,15,May,2007,17:39:59
1 Fault Found:
17544 - Fuel Trim: Bank 1 (Add): System too Lean
P1136 - 35-10 - - - Intermittent
---------------------------------------------------------------------------
Check engine light came on while driving home from a HPDE. Went away within a week of daily driving and only came back under full acceleration.
Friday,07,September,2007,21:18:33
1 Fault Found:
17544 - Fuel Trim: Bank 1 (Add): System too Lean
P1136 - 35-00 - -
---------------------------------------------------------------------------
Check engine light came on during the same session that I made a "money shift" (lost the transmission). Again went away within a week of daily driving.
Thursday,06,March,2008,20:52:49
3 Faults Found:
17544 - Fuel Trim: Bank 1 (Add): System too Lean
P1136 - 35-00 - -
17866 - Exhaust Gas Temp Sensor 2 (G236): Short to Ground
P1458 - 35-10 - - - Intermittent
17546 - Fuel Trim: Bank 2 (Add): System too Lean
P1138 - 35-00 - -
---------------------------------------------------------------------------
Yah, new codes! These came on the drive home from the shop after having valve covers and cam tensioner seals replaced this past week.
Driver's side EGT Sensor was previously replaced Mar, 2006 with 30K on the clock. Currently at 49K.
The car still produces approx 18psi boost and runs smoothly. There's no loss of power or bucking as it did when the first EGT was out.
Car is going in next week for TRE. I'll be forwarding this information to them on Friday but I wanted feedback from the forum on what might be the issue.
Codes and details:
Tuesday,15,May,2007,17:39:59
1 Fault Found:
17544 - Fuel Trim: Bank 1 (Add): System too Lean
P1136 - 35-10 - - - Intermittent
---------------------------------------------------------------------------
Check engine light came on while driving home from a HPDE. Went away within a week of daily driving and only came back under full acceleration.
Friday,07,September,2007,21:18:33
1 Fault Found:
17544 - Fuel Trim: Bank 1 (Add): System too Lean
P1136 - 35-00 - -
---------------------------------------------------------------------------
Check engine light came on during the same session that I made a "money shift" (lost the transmission). Again went away within a week of daily driving.
Thursday,06,March,2008,20:52:49
3 Faults Found:
17544 - Fuel Trim: Bank 1 (Add): System too Lean
P1136 - 35-00 - -
17866 - Exhaust Gas Temp Sensor 2 (G236): Short to Ground
P1458 - 35-10 - - - Intermittent
17546 - Fuel Trim: Bank 2 (Add): System too Lean
P1138 - 35-00 - -
---------------------------------------------------------------------------
Yah, new codes! These came on the drive home from the shop after having valve covers and cam tensioner seals replaced this past week.
Driver's side EGT Sensor was previously replaced Mar, 2006 with 30K on the clock. Currently at 49K.
The car still produces approx 18psi boost and runs smoothly. There's no loss of power or bucking as it did when the first EGT was out.
Car is going in next week for TRE. I'll be forwarding this information to them on Friday but I wanted feedback from the forum on what might be the issue.
03-06-2008, 10:04 PM
#2
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Check block 32 for long term fuel trims (LTFTs). Report values. Should not have an EGT short. Is
that the same EGT that they replaced? If so, clear codes and see what comes back. If it comes back and is same EGT, then your EGT replacement is not right. Contact shop. Make sure that you check LTFTs before clearing codes. Clearing codes will reset LTFTs.
Bruce
Bruce
03-06-2008, 10:24 PM
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Driver's side EGT was replaced, so yes same one. Block 032 log inside.
Codes not cleared. Just done with a full throttle acceleration.
<img src="http://pictureposter.audiworld.com/88196/log-01-32-xxx-xxx.jpg">
<img src="http://pictureposter.audiworld.com/88196/log-01-32-xxx-xxx.jpg">
03-06-2008, 10:48 PM
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OK looks lean, but not real severe (~10%). Clear your codes and see if EGT sensor short comes back.
If so, then something wrong with EGT replacement.
Bruce
Bruce
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