03-21-2011, 02:49 PM
Here is my troubleshooting tree....
Poor High Speed Operation
Low fuel pump volume Faulty pump or restricted fuel lines or filters
Poor MAP sensor signal Test MAP sensor, vacuum hose and wiring
Poor Oxygen sensor signal Test for shorted or open sensor or circuit
Open coolant temperature Test sensor and sensor circuit wiring
Faulty ignition operation Check wires for cracks or poor connections,
test secondary voltage with oscilloscope
Contaminated fuel Test fuel for water or alcohol
Intermittent ECM ground Test ECM ground connection for resistance
Restricted air cleaner Replace air cleaner
Restricted exhaust system Test for exhaust manifold back pressure
Poor MAF sensor signal Check leakage between sensor and manifold
Poor VSS signal If tester for ALCL hook-up is available check that VSS
reading matches speedometer
Have you run another self test on the EEC?
Poor High Speed Operation
Low fuel pump volume Faulty pump or restricted fuel lines or filters
Poor MAP sensor signal Test MAP sensor, vacuum hose and wiring
Poor Oxygen sensor signal Test for shorted or open sensor or circuit
Open coolant temperature Test sensor and sensor circuit wiring
Faulty ignition operation Check wires for cracks or poor connections,
test secondary voltage with oscilloscope
Contaminated fuel Test fuel for water or alcohol
Intermittent ECM ground Test ECM ground connection for resistance
Restricted air cleaner Replace air cleaner
Restricted exhaust system Test for exhaust manifold back pressure
Poor MAF sensor signal Check leakage between sensor and manifold
Poor VSS signal If tester for ALCL hook-up is available check that VSS
reading matches speedometer
Have you run another self test on the EEC?
'77 351w- Explorer EFI, 4R70W, 4-link, lockers, 4.56, 35" MT/Rs with a severe rock addiction.
mokin:
Roads? Where we're going, we don't need roads.
![[Image: sig2.jpg]](http://i288.photobucket.com/albums/ll176/mchuzie/sig2.jpg)
mokin:Roads? Where we're going, we don't need roads.