Econoline E350 1 Ton V8-5.4L Prop SOHC VIN Z (1998)
The cylinder specific miss has to be identified as shown in the example in Figure 2 in order to proceed with the remaining steps. If the miss does not
occur at idle (in the bay), try to brake torque the engine. This extra loading should reproduce the miss in the bay. If the miss cannot be reproduced during
brake torque, select Relative Compression under Powertrain on WDS before going on a road test to rule out mechanical problems. If Relative
Compression shows a problem then the base engine issue must be serviced. If Relative Compression results are good (Figure 3), road test under as many
different driving conditions as possible until the miss occurs on Power Balance. Some misses may be very intermiffent so be patient and concentrate on
steady load conditions. Once a cylinder dropout is identified proceed to Step 2.
Step 2: (Select Toolbox Icon, then Powertrain, then Fuel System Test)
Run Fuel System Test on WDS to determine if there may be a fuel problem. After completing fuel Pressure/Leakdown test, select Injector flow to isolate
