98 v6 camaro stock please look
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1st Gear Member
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98 v6 camaro stock please look
here are my fuel trims do they seem normale to you? bank 1,2 ol,not ready cl. calculated load 69.01%, temp 85c degrees, st. fuel trim bank one .79%, lt. fuel trim 8.60%, bank two 0.79%, lt. 14.83%, intake 96.00kpa, engine speed 3675.75, vehicle speed 74km/h, mass air flow 116.01, throttle pos. 58.42, please tell me what it all means????
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Tech Droid
Joined: Aug 2005
Posts: 9,215
From: North East PA
RE: 98 v6 camaro stock please look
Fuel Trim refers to feedback adjustments to the base fuel schedule/table . The adjustments are made by the PCM/ECM in response to the input from various sensors. In particular O2, ECT, AIT, MAP, MAF, TPS. The PCM looks at all these inputs an references a point on the fuel table and commands the injectors to deliver a certain amount of fuel.
There are two types of fuel trim Short Term and Long Term.
Short Term Trim refers to dynamic or instantaneous adjustments (i.e., during braking/accelerating).
Long Term Trim refers to much more gradual adjustments to the fuel calibration schedule than short-term trim adjustments. Long term adjustments compensate for vehicle differences and gradual changes that occur over time.
When the short term trim reaches set upper or lower limits of adjustments it causes the Long Term Trim to be adjusted so that the Short Term trim is brought back to mid range. When the long range trim reaches the lower or upper limits, no further adjustments are possible and the PCM will light the MIL.
As long as the MIL (check engine light) stays off, the PCM is taking care of business and the fuel delivery is optimized for current conditions.
The other stuff is self explanatory:
Calculated load is what the PCM thinks the load on the engine is based on sensor inputs.
Temp is the coolant temp as seen by the ECT (Engine Coolant Temp sensor)
Intake KPH is the Manifold Absolute Pressure (vacuum) as seen by the MAP sensor.
Air Flow is the amount of air going into the engine as measure by the MAF (Mass Air Flow sensor)
Throtle Position is the throttle blade angle as seen by the TPS (Throttle Position Sensor)
If you need more info you should get a factory shop manual or a tuners manual and study up on this stuff.
There are two types of fuel trim Short Term and Long Term.
Short Term Trim refers to dynamic or instantaneous adjustments (i.e., during braking/accelerating).
Long Term Trim refers to much more gradual adjustments to the fuel calibration schedule than short-term trim adjustments. Long term adjustments compensate for vehicle differences and gradual changes that occur over time.
When the short term trim reaches set upper or lower limits of adjustments it causes the Long Term Trim to be adjusted so that the Short Term trim is brought back to mid range. When the long range trim reaches the lower or upper limits, no further adjustments are possible and the PCM will light the MIL.
As long as the MIL (check engine light) stays off, the PCM is taking care of business and the fuel delivery is optimized for current conditions.
The other stuff is self explanatory:
Calculated load is what the PCM thinks the load on the engine is based on sensor inputs.
Temp is the coolant temp as seen by the ECT (Engine Coolant Temp sensor)
Intake KPH is the Manifold Absolute Pressure (vacuum) as seen by the MAP sensor.
Air Flow is the amount of air going into the engine as measure by the MAF (Mass Air Flow sensor)
Throtle Position is the throttle blade angle as seen by the TPS (Throttle Position Sensor)
If you need more info you should get a factory shop manual or a tuners manual and study up on this stuff.
Thread Starter
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1st Gear Member
Joined: Mar 2008
Posts: 260
From:
RE: 98 v6 camaro stock please look
ORIGINAL: z28pete
Fuel Trim refers to feedback adjustments to the base fuel schedule/table . The adjustments are made by the PCM/ECM in response to the input from various sensors. In particular O2, ECT, AIT, MAP, MAF, TPS. The PCM looks at all these inputs an references a point on the fuel table and commands the injectors to deliver a certain amount of fuel.
There are two types of fuel trim Short Term and Long Term.
Short Term Trim refers to dynamic or instantaneous adjustments (i.e., during braking/accelerating).
Long Term Trim refers to much more gradual adjustments to the fuel calibration schedule than short-term trim adjustments. Long term adjustments compensate for vehicle differences and gradual changes that occur over time.
When the short term trim reaches set upper or lower limits of adjustments it causes the Long Term Trim to be adjusted so that the Short Term trim is brought back to mid range. When the long range trim reaches the lower or upper limits, no further adjustments are possible and the PCM will light the MIL.
As long as the MIL (check engine light) stays off, the PCM is taking care of business and the fuel delivery is optimized for current conditions.
The other stuff is self explanatory:
Calculated load is what the PCM thinks the load on the engine is based on sensor inputs.
Temp is the coolant temp as seen by the ECT (Engine Coolant Temp sensor)
Intake KPH is the Manifold Absolute Pressure (vacuum) as seen by the MAP sensor.
Air Flow is the amount of air going into the engine as measure by the MAF (Mass Air Flow sensor)
Throtle Position is the throttle blade angle as seen by the TPS (Throttle Position Sensor)
If you need more info you should get a factory shop manual or a tuners manual and study up on this stuff.
Fuel Trim refers to feedback adjustments to the base fuel schedule/table . The adjustments are made by the PCM/ECM in response to the input from various sensors. In particular O2, ECT, AIT, MAP, MAF, TPS. The PCM looks at all these inputs an references a point on the fuel table and commands the injectors to deliver a certain amount of fuel.
There are two types of fuel trim Short Term and Long Term.
Short Term Trim refers to dynamic or instantaneous adjustments (i.e., during braking/accelerating).
Long Term Trim refers to much more gradual adjustments to the fuel calibration schedule than short-term trim adjustments. Long term adjustments compensate for vehicle differences and gradual changes that occur over time.
When the short term trim reaches set upper or lower limits of adjustments it causes the Long Term Trim to be adjusted so that the Short Term trim is brought back to mid range. When the long range trim reaches the lower or upper limits, no further adjustments are possible and the PCM will light the MIL.
As long as the MIL (check engine light) stays off, the PCM is taking care of business and the fuel delivery is optimized for current conditions.
The other stuff is self explanatory:
Calculated load is what the PCM thinks the load on the engine is based on sensor inputs.
Temp is the coolant temp as seen by the ECT (Engine Coolant Temp sensor)
Intake KPH is the Manifold Absolute Pressure (vacuum) as seen by the MAP sensor.
Air Flow is the amount of air going into the engine as measure by the MAF (Mass Air Flow sensor)
Throtle Position is the throttle blade angle as seen by the TPS (Throttle Position Sensor)
If you need more info you should get a factory shop manual or a tuners manual and study up on this stuff.
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