So, a couple weeks ago after cleaning out the PCV orifice in the intake manifold (was clogged since owning the car and is a common issue with this model) without fully removing the manifold and using a pick to clear out the hole, I experienced a rough idle as I took my first drive. I believe I sprayed down the throttle body and MAP sensor (crc electronic cleaner on the MAP, which looking back. might have left some residue). I have a rough idle that comes and goes often after the engine is fully warmed up. On cold starts it seems to drive normally.
Previous to the first rough idle I would get a single P0172 code that would come and go on its own for a couple months. I figured it had to do with the clogged PCV orifice and oil catch can setup I have. After the first experience with the rough idle I soon got an additional code of P0300.
I then cleaned the MAF, MAP, Throttle Body, and checked for any Vacuum leaks but couldn't find any (sprayed carb cleaner everywhere with no noticeable idle change then tried water). I was due for spark plugs, so I went ahead and replaced all 4 with OEM and did an oil change with no change to the rough idle. except one time I saw a P0303 code which went away and reverted back to the P0300.
Here are the following values from my scanner. The values from 1 number to another indicates that the value is constantly changing.
Cold (Not Running) SHRTFT1: -100 | LongFT1: -16.4 | ECT: 73.40 | MAP(inHG): 28.64 | TP%: 32.2 | IAT11: 86 | IAT12: 75.20
Cold (Park/Idle) LoadPCT: 28 to 33 | ECT: 104 | SHRTFT1: -5 to +3 | LongFT1: -5.5 | FP: 43 to 44 | MAP(inHG): 7 to 8 | RPM: 880 to 910 | TP%: 13.7 to 14.1 | MAF(lbs): 0.01 | SparkADV: 9 to 16 | O2S11: 0.05 to 0.8 | O2S12: 0.79 to 0.8 | FRP: 449 to 462 | EVAPPCT: 27.8 to 29 | FLI: 27.5 | EVAPVP: -0.57 | BARO: 28.94 | CATEMP11: 996.80 | VPWR: 12.51 | TP_R: 3.1 | IAT11: 87.80 | IAT12: 91.40
Hot (In Gear/Idle) LoadPCT: 32 to 33 | ECT: 199.40 | SHRTFT1: -4 to +1 | LongFT1: -18 | FP: 51 to 54 | MAP(inHG): 10.34 | RPM: 738 to 760 | TP%: 14.9 | MAF(lbs): 0.01 | SparkADV: 6.5 to 10 | O2S11: 0.02 to 0.8 | O2S12: 0.76 | FRP: 436 to 442 | EVAPPCT: 13.3 | FLI: 40.8 | EVAPVP: -0.06 | BARO: 28.94 | CATEMP11: 998.60 | VPWR: 13.82 | TP_R: 4.3 | IAT11: 120.20 | IAT12: 125.60
(--Freeze Frame On P0300--) LoadPCT: 26.7 | ECT: 197.60 | SHRTFT1: 0.0 | LongFT1: -48.4 | FP: 59.18 | MAP(inHG): 8.56 | RPM: 889 | TP%: 14.9 | MAF(lbs): 0.01 | SparkADV: 19.5 | O2S11: 0.19 | O2S12: 0.74 | FRP: 472.82 | EVAPPCT: 13.7 | FLI: 14.5 | EVAPVP: -0.20 | BARO: 29.23 | CATEMP11: 1126.40 | VPWR: 14.208 | TP_R: 4.7 | IAT11: 132.80 | IAT12: 134.60
Any Help Is Appreciated! Thank You!
Previous to the first rough idle I would get a single P0172 code that would come and go on its own for a couple months. I figured it had to do with the clogged PCV orifice and oil catch can setup I have. After the first experience with the rough idle I soon got an additional code of P0300.
I then cleaned the MAF, MAP, Throttle Body, and checked for any Vacuum leaks but couldn't find any (sprayed carb cleaner everywhere with no noticeable idle change then tried water). I was due for spark plugs, so I went ahead and replaced all 4 with OEM and did an oil change with no change to the rough idle. except one time I saw a P0303 code which went away and reverted back to the P0300.
Here are the following values from my scanner. The values from 1 number to another indicates that the value is constantly changing.
Cold (Not Running) SHRTFT1: -100 | LongFT1: -16.4 | ECT: 73.40 | MAP(inHG): 28.64 | TP%: 32.2 | IAT11: 86 | IAT12: 75.20
Cold (Park/Idle) LoadPCT: 28 to 33 | ECT: 104 | SHRTFT1: -5 to +3 | LongFT1: -5.5 | FP: 43 to 44 | MAP(inHG): 7 to 8 | RPM: 880 to 910 | TP%: 13.7 to 14.1 | MAF(lbs): 0.01 | SparkADV: 9 to 16 | O2S11: 0.05 to 0.8 | O2S12: 0.79 to 0.8 | FRP: 449 to 462 | EVAPPCT: 27.8 to 29 | FLI: 27.5 | EVAPVP: -0.57 | BARO: 28.94 | CATEMP11: 996.80 | VPWR: 12.51 | TP_R: 3.1 | IAT11: 87.80 | IAT12: 91.40
Hot (In Gear/Idle) LoadPCT: 32 to 33 | ECT: 199.40 | SHRTFT1: -4 to +1 | LongFT1: -18 | FP: 51 to 54 | MAP(inHG): 10.34 | RPM: 738 to 760 | TP%: 14.9 | MAF(lbs): 0.01 | SparkADV: 6.5 to 10 | O2S11: 0.02 to 0.8 | O2S12: 0.76 | FRP: 436 to 442 | EVAPPCT: 13.3 | FLI: 40.8 | EVAPVP: -0.06 | BARO: 28.94 | CATEMP11: 998.60 | VPWR: 13.82 | TP_R: 4.3 | IAT11: 120.20 | IAT12: 125.60
(--Freeze Frame On P0300--) LoadPCT: 26.7 | ECT: 197.60 | SHRTFT1: 0.0 | LongFT1: -48.4 | FP: 59.18 | MAP(inHG): 8.56 | RPM: 889 | TP%: 14.9 | MAF(lbs): 0.01 | SparkADV: 19.5 | O2S11: 0.19 | O2S12: 0.74 | FRP: 472.82 | EVAPPCT: 13.7 | FLI: 14.5 | EVAPVP: -0.20 | BARO: 29.23 | CATEMP11: 1126.40 | VPWR: 14.208 | TP_R: 4.7 | IAT11: 132.80 | IAT12: 134.60
Any Help Is Appreciated! Thank You!
Jun 6, 2023 at 9:26 PM
