Passed Smog Check
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Post Fiend
Joined: Jun 2001
Posts: 5,228
Likes: 5
From: Running Springs CA
Passed Smog Check
Smog Check Vehicle Inspection Report
Model Year: 1994, Make: FORD, Model: F-150 REG CAB - LONG
Engine Size: 5.0 L, Type: Truck, Transmission: Automatic
GVWR: 6250, Test Weight: 4500
Odometer: 126846, Certification: California
Fuel Type: Gasoline, Exhaust: Single, Inspection Reason: High Emitter Profile
__________%CO2_%O2____HC (PPM)______CO (%)______NO (PPM)___
Test__RPM_MEAS_MEAS_MAX_AVE_MEAS_MAX_AVE_MEAS_MAX_ AVE_MEAS
15mph_1505_11.7__4.5__116___35__38__0.60_0.11_0.00 __992__267__414
25mph_1464_11.6__4.5___93___24__39__1.03_0.09_0.00 __852__210__462
Everything is stock except for Bosch single platinum plugs. Fuel is Chevron 87 with 5% ethanol (California RFG II standard blend). The test was taken near sea level, not at my home elevation of 6300 ft.
Jim
Model Year: 1994, Make: FORD, Model: F-150 REG CAB - LONG
Engine Size: 5.0 L, Type: Truck, Transmission: Automatic
GVWR: 6250, Test Weight: 4500
Odometer: 126846, Certification: California
Fuel Type: Gasoline, Exhaust: Single, Inspection Reason: High Emitter Profile
__________%CO2_%O2____HC (PPM)______CO (%)______NO (PPM)___
Test__RPM_MEAS_MEAS_MAX_AVE_MEAS_MAX_AVE_MEAS_MAX_ AVE_MEAS
15mph_1505_11.7__4.5__116___35__38__0.60_0.11_0.00 __992__267__414
25mph_1464_11.6__4.5___93___24__39__1.03_0.09_0.00 __852__210__462
Everything is stock except for Bosch single platinum plugs. Fuel is Chevron 87 with 5% ethanol (California RFG II standard blend). The test was taken near sea level, not at my home elevation of 6300 ft.
Jim
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Post Fiend
Joined: Jun 2001
Posts: 5,228
Likes: 5
From: Running Springs CA
Air density decreases by three percent for every 1000 feet, so it is 20 percent less at my altitude, and I really notice the loss of power. EFI engines correct the mixture, carbed engines run too rich. This report shows me that the engine is running lean, probably because Ford did not calibrate it for oxygenated gas.
Jim
Jim
Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
Originally Posted by jimandmandy
This report shows me that the engine is running lean, probably because Ford did not calibrate it for oxygenated gas.
Jim
Jim
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Post Fiend
Joined: Jun 2001
Posts: 5,228
Likes: 5
From: Running Springs CA
The MAF system should compensate for altitude and then the O2 sensor for final mixture correction. So, in theory, the oxygenated gas should be compensated out by the O2 sensor. I'm just looking at the zero CO2 and almost five percent O2 in the exhaust. I know very little about programming EFI systems. Ford probably intended for the engine to run very lean, but not to the point of misfire, at part throttle.
Jim
Jim
