|86-88 5.7L VIN 6 Carb
||Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds.
Engine was at normal operating temperature and had been running for
at least 2 minutes after start with a throttle angle above 5%.
||Coolant temperature sensor signal indicates a temperature of over
275° F for 2 seconds.
||Coolant temperature sensor signal indicates a temperature colder than
-27° F for 30 seconds after the engine has been running for at least
||TPS was above 2.5 volts for 8 seconds when the MAP sensor signal l
showed manifold vacuum to be 15 pounds or more.
||TPS voltage was under 0.2 volts for 2 seconds when the engine was
||Inlet air temperature sensor signal showed an air temperature below
-22° F after the engine has been running for 5 minutes.
||When engine speed was between 1200 and 4400 RPM and throttle position
angle was less than 2%, the MAP signal showed low voltage (high manifold
vacuum) for at least 5 seconds.
||Inlet air temperature sensor signal showed an air temperature over
302° F after the engine has been running for 5 minutes.
||EGR open command did not change MAP sensor signal. Normal EGR flow
should cause slight decrease in manifold vacuum which would change MAP
||MAP sensor signal voltage was too high (low vacuum) for 5 seconds
when throttle opening was under 4%.
||MAP sensor signal voltage was too low (high vacuum) when engine speed
was under 1200 RPM or the engine speed was over 1200 RPM with a throttle
position angle above 21%.
||The EST signal did not change when the ECM applied bypass voltage
to the ignition module.
||The ECM did not detect a knock signal during near wide open throttle
operation with coolant temperature above 194° F or the knock signal
was present for 5 seconds or more during normal engine operation.
||Oxygen sensor voltage was under 0.2 volts for 50 seconds of closed
||Oxygen sensor voltage was over 0.7 volts for 30 seconds of closed
loop operation with a throttle angle between 2% and 20%.
||Fuel pump voltage was not present at fuel pump sense line for 2 seconds
after the ECM has sent the fuel pump on command.
||ECM error. Replace ECM.